Re: [Elecraft] Weird K-3 Power Behavior

[Bob McGraw]

Fred et al:

Based on Don's information, 4 bars on solid, 5th bar flickering, 6th bar 
is beginning of ALC.    Also I seem to recall an exchange of information 
with a member of the  Elecraft staff that confirmed the beginning of ALC 
at the 6th bar.


I think this is getting into a hair splitting issue.

73

Bob, K4TAX


On 4/6/2024 2:03 PM, Fred Jensen wrote:
Hmmm ... I thought that the ALC started AT the 5th bar and the first 4 
bars were sort of a VU-meter.  Hence Don's occasional advice, "4 full 
bars and the 5th occasionally flickering."  I've been known to get 
things wrong in the past however.


73,

Fred ["Skip"] K6DGW
Sparks NV DM09dn
Washoe County

Bob McGraw wrote on 4/6/2024 8:50 AM:
Just to be clear on the point.  The correct audio level should 
produce 4 bars indicated on the ALC Scale.  Actual ALC action does 
not start until after the 5th bar.


Yes, after any power adjustment, the audio system does start at lower 
gain, quickly ramping to the desired level.  This is done to prevent 
any potential power overshoot.  After the initial transmission at the 
new power setting, the remainder of transmissions are at the proper 
power level setting.


73

Bob, K4TAX


On 4/5/2024 5:50 PM, elecraft-requ...@mailman.qth.net wrote:

Message: 14
Date: Thu, 4 Apr 2024 21:03:20 -0400
From: Pete Smith N4ZR
To:elecraft@mailman.qth.net
Subject: Re: [Elecraft] Weird K-3 Power Behavior
Message-ID:<59c02b5d-1800-4a78-9d73-60461d231...@gmail.com>
Content-Type: text/plain; charset=UTF-8; format=flowed

I just set the audio to be sure I'm? hitting 4 bars of ALC,and the 
cycle

of adjust K-3 power to full expected drive to the KPA-1500 is now more
like CW, but the question remains -? after I adjust the power a tiny
fraction in either direction, why does the K-3's output power drop way
back and relatively slowly recover?

73, Pete N4ZR



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[Elecraft] Weird K-3 Power Behavior

[Bob McGraw]

Just to be clear on the point.  The correct audio level should produce 4 
bars indicated on the ALC Scale.  Actual ALC action does not start until 
after the 5th bar.


Yes, after any power adjustment, the audio system does start at lower 
gain, quickly ramping to the desired level.  This is done to prevent any 
potential power overshoot.  After the initial transmission at the new 
power setting, the remainder of transmissions are at the proper power 
level setting.


73

Bob, K4TAX


On 4/5/2024 5:50 PM, elecraft-requ...@mailman.qth.net wrote:

Message: 14
Date: Thu, 4 Apr 2024 21:03:20 -0400
From: Pete Smith N4ZR
To:elecraft@mailman.qth.net
Subject: Re: [Elecraft] Weird K-3 Power Behavior
Message-ID:<59c02b5d-1800-4a78-9d73-60461d231...@gmail.com>
Content-Type: text/plain; charset=UTF-8; format=flowed

I just set the audio to be sure I'm? hitting 4 bars of ALC,and the cycle
of adjust K-3 power to full expected drive to the KPA-1500 is now more
like CW, but the question remains -? after I adjust the power a tiny
fraction in either direction, why does the K-3's output power drop way
back and relatively slowly recover?

73, Pete N4ZR

--
"You only grow old when you run out of new things to do"
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Re: [Elecraft] Elecraft Digest, Vol 239, Issue 12

[Bob McGraw]

Did the fault occur immediately after a band change?  I occasionally see 
a slight  power overshoot from my K3S on the first transmission after a 
band change.    Perhaps a transmit gain calibration is in order.   I use 
the K3 Utility for this purpose and a known good 50 ohm dummy load.   
The radio will do the rest.


73

Bob, K4TAX




On 3/30/2024 7:37 PM, elecraft-requ...@mailman.qth.net wrote:

Message: 7
Date: Wed, 27 Mar 2024 10:18:59 -0400
From: Pete Smith N4ZR
To:kpa1...@groups.io, Elecraft Support,
Elecraft List
Subject: [Elecraft] Erratic KPA-1500 behavior
Message-ID:
Content-Type: text/plain; charset=UTF-8; format=flowed

This morning, starting the CWT,? every few transmissions my amp was
faulting with the indication of excessive driving power (~67 watts vs 33
watts normally).? Each time, it would fault once, then operate normally
for a dozen or so transmissions before the next fault. Then, about 10
minutes into the hour, the faults stopped happening.? The K-3 showed 33
watts throughout

I checked the KPA-1500 log, and all it shows is the "power input"
fault.? What could be causing this erroneous indication of excessive
drive?? A sticky relay?

-- 73, Pete N4ZR

--
"You only grow old when you run out of new things to do"
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[Elecraft] K3S help needed

[Bob McGraw]

THANKS for posting the result and efforts which took place to get you up 
and running.   I hope you enjoy your K3S as much as I've enjoyed mine.


73

Bob, K4TAX

Message: 18
Date: Sat, 23 Mar 2024 16:49:27 -0400
From: Carol Richards
To:elecraft@mailman.qth.net
Subject: [Elecraft] K3s
Message-ID:<59b040f2-7707-4315-894d-30655295c...@comcast.net>
Content-Type: text/plain; charset=us-ascii


Good evening all. Finally got the k3s keying. Thanks for all the help I 
received.

 Carol


On 3/24/2024 2:08 PM, elecraft-requ...@mailman.qth.net wrote:

Message: 18
Date: Sat, 23 Mar 2024 16:49:27 -0400
From: Carol Richards
To:elecraft@mailman.qth.net
Subject: [Elecraft] K3s
Message-ID:<59b040f2-7707-4315-894d-30655295c...@comcast.net>
Content-Type: text/plain; charset=us-ascii


Good evening all. Finally got the k3s keying. Thanks for all the help I 
received.

  Carol

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[Elecraft] KAT 500 Loses Match

[Bob McGraw]

From your description, something in the antenna system, coax, 
connector, balun, antenna is heating and changing value.   I doubt it is 
the radio, or the amplifier, or the tuner.


That antenna is rated at 250 watts PEP.  Sure bet you are exceeding the 
power rating with the KPA500 running.


73

Bob, K4TAX



On 1/13/2024 3:58 PM, elecraft-requ...@mailman.qth.net wrote:

Message: 5
Date: Fri, 12 Jan 2024 23:28:09 -0600
From: "Michael Reynolds, NO6O"
To:elecraft@mailman.qth.net
Subject: Re: [Elecraft] KAT 500 Loses Match
Message-ID:
Content-Type: text/plain; charset=UTF-8; format=flowed

Greetings,

I joined this list today, after sending a message to Elecraft support,
describing a similar problem.? I have an Icom IC-7610, with the KPA500
and KAT500, and my SWR spontaneously climbs into the red sometimes
during transmissions.? It takes some effort to correct it, and I
typically lose a QSO in the process.? The relays go nuts trying to
re-tune, and sometimes produces a fault condition. Usually, I can
correct it by restarting both the amplifier and tuner.? I have a Comet
CHA-250HD, which has a almost a flat 1.1 SWR from 80m to 6m.? I don't
need a tuner while barefoot.? However, when I first hooked up the
KPA500, the SWR was not flat, and added the KAT500 this week, which led
to my SWR issue.

I hope the cause and resolution can be determined.

Michael
NO6O

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[Elecraft] Beware of junk mail:

[Bob McGraw]

F Y I  --

When one sends an e-mail to multiple persons or addresses, PLEASE use 
the BCC address line for the distribution.  Do send the message TO 
yourself.   This minimizes the ability to clone or copy e-mail 
addresses. By avoiding visible e-mail addresses it is much more 
difficult to build an spam and junk e-mail address list. That is how 
most of the junk e-mail originates.


73

Bob, K4TAX
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Re: [Elecraft] Elecraft Digest, Vol 236, Issue 8

[Bob McGraw]

I disagree.  There is the knowledge base which is likely missing.  Not 
to mention unique test fixtures and spare parts required.   Spare parts 
means inventory of replacement boards. One can not effectively or 
economically do component level troubleshooting with these radios.  It 
is less expensive to build and replace a board than pay a good tech a 
few hours for troubleshooting.


As the say, "I've been there, and I've done that".

73

Bob, K4TAX


On 12/15/2023 11:57 AM, elecraft-requ...@mailman.qth.net wrote:

Message: 9
Date: Thu, 14 Dec 2023 13:57:33 -0500
From: Pete Smith N4ZR
To:elecraft@mailman.qth.net
Subject: Re: [Elecraft] User's Dilemma
Message-ID:<663c713a-1470-403d-ac80-bd259c84e...@gmail.com>
Content-Type: text/plain; charset=UTF-8; format=flowed

If they were starting from scratch, I'd agree, but there are
currently-operating independent technicians out here who could be up and
running relatively easily.

73, Pete N4ZR

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[Elecraft] User's Dilemma

[Bob McGraw]

I can totally agree with Joe, W4TV.   At one time I was repairing radios 
for various companies.  I was doing warranty and non-warranty repairs.  
The companies decided it was cost ineffective to maintain independent 
repair services.  Hence, I no longer repair radios, and no longer have 
test equipment to do so. There were other reasons as well, but I agree 
with Joe, W4TV, the expert knowledge base is in Watsonville.


73

Bob, K4TAX


On 12/15/2023 11:57 AM, elecraft-requ...@mailman.qth.net wrote:

Message: 5
Date: Thu, 14 Dec 2023 13:03:23 -0500
From: "Joe Subich, W4TV"
To:elecraft@mailman.qth.net
Subject: Re: [Elecraft] User's Dilemma
Message-ID:
Content-Type: text/plain; charset=UTF-8; format=flowed



They clearly aren't interested in setting up a third party repair
center.

Given the cost of setting up and running a second "factory
warranty/repair center" it just doesn't make sense.  Notice
that none of the other radio manufacturers offer duplicate
facilities on the east/west coast ... even those that did so
at one time have pulled back.

The cost of facilities, duplicate test equipment, duplicate
spare/repair parts, etc. simply can not be amortized economically
across one or two technicians.  It's far more efficient to simply
add another technician or two (*IF*  one can find a qualified tech)
"at the mothership".

73,

 ... Joe, W4TV

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[Elecraft] Noise from KAT500?

[Bob McGraw]

 The KPA500 at the station only matches the transmitter to the 
transmission line and likewise for the receiver.   It does not change 
the match between the antenna and transmission line, thus the SWR and 
related loss from SWR remains.


73

Bob, K4TAX

On 12/4/2023 8:07 AM, elecraft-requ...@mailman.qth.net wrote:

To me, it sounds like that when the ATU is inline (& I presume you let
it tune to that antenna at some point.? Yes/No?)
The antenna is better matched to the transmission line, so more of the
on-air "ambient" noise is delivered to the RX.

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[Elecraft] KX3 2M amp

[Bob McGraw]

I use an external VHF amp with my transverter.  Works great!   Do be 
mindful of the amp switching time. The relay switching time is about 15 
ms.   I prefer to use hardwire PTT as opposed to using RF detection to 
switch the amp.


73

Bob, K4TAX

On 12/4/2023 8:07 AM, elecraft-requ...@mailman.qth.net wrote:

Message: 1
Date: Sun, 3 Dec 2023 09:37:09 -0700
From: Steve McKee
To:elecraft@mailman.qth.net
Subject: [Elecraft] KX3 2M amp
Message-ID:

Content-Type: text/plain; charset="UTF-8"

Hello,
I?ve have the 2 meter module in my KX3, and am wondering if I can hook a
small VHF amplifier to it, to increase power output??
I?m planning on purchasing the KXPA 100 for the HF side?.
Course these are both for in home use, not in the field?QRP in the field?

Thank You, 73?s


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Re: [Elecraft] Elecraft Digest, Vol 236, Issue 2

[Bob McGraw]

There are many very nice, well filtered, well regulated power supplies 
on the market.  I see NO REASON for using anything other than the 
station power supply to power all accessories.    As to plant lights, 
use a separate power supply and not the piece of junk supplied with them.


I have and use two switch mode supplies for all of my station 
equipment.  That encompasses two 100 watt transceivers an a 150 watt VHF 
amp.   From 160M - 2M I have ZERO noise from either or from both of 
these supplies.   Frequently I am running two radios on 2 different 
bands at the same time.


Jim, K9YC, has very strong merits in that each and every piece of 
equipment MUST be bonded to a single common point.   I use the station 
power supply for my single common bonding  point.  I DO NOT use an 
external dedicated ground as it would be 35 ft in length and serve as an 
antenna to pick up noise.  After all, that is 1/4 wavelength on 40M.


As to what's in the neighborhood, that's another issue out of my control.

73

Bob, K4TAX

On 12/3/2023 9:52 AM, elecraft-requ...@mailman.qth.net wrote:

Message: 14
Date: Sun, 3 Dec 2023 05:19:39 +
From: Bill Johnson
To:"j...@audiosystemsgroup.com"  ,
"elecraft@mailman.qth.net"  
Subject: Re: [Elecraft] Noise from KAT500?
Message-ID:



Content-Type: text/plain; charset="us-ascii"

It gets worse with all the new gadgets and LED lighting.  I just
installed new plant lights, LEDs, and the racket from the wall warts is
terrible.  I shut them off when operating, or not interested in lighting
  up the plants.  Terrible view of the noise on K4 graphic display.

Bill
K9YEQ

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[Elecraft] Noise from KAT500?

[Bob McGraw]

Just power it from the transceiver power supply and all will be 
resolved.   There is no point in making life complex.


73

Bob, K4TAX


On 12/3/2023 9:52 AM, elecraft-requ...@mailman.qth.net wrote:

Message: 8
Date: Sun, 3 Dec 2023 01:48:45 +
From: W2HX
To: Michael Carter, Elecraft Reflector Reflector

Subject: Re: [Elecraft] Noise from KAT500?
Message-ID:



Content-Type: text/plain; charset="utf-8"

Mike, K8CN wins the cigar!



The issue is the power supply ? I took some spectrum analyzer plots to 7
  MHz and you can see what I saw. The set up is spectrum analyzer ->
KAT500 -> Dummy Load. First picture are two "max hold" traces
superimposed where the problem can be seen.

https://w2hx.com/x/Elecraft/KAT500/Noise-Issue/KAT500-AC-Power.png

The "lower" trace is what I saw with the kat500 in bypass. The "top"
trace is with the kat500 inline (auto or manual).



I then replaced the wall-wart power supply with a 12V battery. And this
is what I saw for BOTH bypass and inline. Clearly the problem.

https://w2hx.com/x/Elecraft/KAT500/Noise-Issue/KAT500-battery.png

using a battery, the noise is about -80 dBm. Using the wall-wart, in some cases 
the noise is as high as -60 dBm



My task now is to either leave it on battery or preferably, find a low noise PS.



Thanks everyone for the ideas.



73 Eugene W2HX

Subscribe to my Youtube Channel:https://www.youtube.com/@w2hx/videos

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[Elecraft] Duty Cycle of FT8 #Elecraft

[Bob McGraw]

The complete FT-8 cycle is 30 seconds of which 12.63 seconds is the 
actual transmitting period.  Therefore (12.63/30)*100 = 42.1%.


As to backing down the power, the measured performance on my KPA500 
indicates the highest dissipation does occur at lower power levels.  On 
20M at 500 watts output the dissipation is 368.0 watts for an efficiency 
of 57.6%, while at 200 watts the dissipation if 388.7 watts for an 
efficiency of 34.0%.   I've concluded, with my KPA500, reducing the 
output power is not advantageous with regard to amp performance.


Based on published data in the manual, the duty cycle at 500 watts is 
100% for 10 minutes, and 5 minutes of standby.  Applying the same 
concept, then (10/15)*100 = 66.6%.   Clearly FT-8 at 500 watts output is 
well below the duty cycle rating of the KPA500.


I suggest one do the same measurements for the KPA1500 and find out what 
the real numbers might be and publish the results.  To be fair, one 
needs an accurate power meter and a known good 50 ohm resistive load and 
a little math.


73

Bob, K4TAX


On 11/13/2023 8:03 AM, elecraft-requ...@mailman.qth.net wrote:

Message: 1
Date: Fri, 10 Nov 2023 09:27:18 -0500
From: Pete Smith N4ZR
To:ws...@groups.io, Elecraft List
Subject: [Elecraft] Duty Cycle of FT8 #Elecraft
Message-ID:<261a35c3-7996-433a-833a-b0a1e7cb2...@gmail.com>
Content-Type: text/plain; charset=UTF-8; format=flowed

I started operating FT8 while my KPA-1500amp was out for repair.? Now
it's back and raising a question:

Operating with just my K-3, set at 100 watts, I would see 100 watts
indicated on its meter through the whole 15-second FT8 transmission..?
When I drive my amp, it only needs 30 watts for full CW power (on 24
MHz),? but the amp indicates 1200 watts input for the whole FT8 transmit
cycle.? I'm wondering if I should back off to protect the
amp,considering the duty cycle is so high - on the other hand, the
temperature reading profile of the amp seems to be pretty much the same
as on CW.

73, Pete N4ZR

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[Elecraft] K3S Split Operation

[Bob McGraw]

Not only does one have to return the QSL cards, but they must turn in 
their EXTRA Class license for a Technician Class license.


73

Bob, K4TAX



On 11/6/2023 2:36 PM, elecraft-requ...@mailman.qth.net wrote:

I wonder how I can work split then on my K3/10 without a 2nd RX...do I have
to return the QSL cards?


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[Elecraft] K3S Split Operation

[Bob McGraw]

SPLIT operation is easily accomplished with a single receiver K3S.  Five 
easy steps follows:


1.  Select the band, frequency and mode of your choice as seen on VFO A. 
  (that's the big knob)


2.  Press and release A > B button.  This sets VFO A and VFO B to the 
same band, frequency and mode.


3.  Press and hold A > B.  Upon release of A > B button one is now in 
the SPLIT mode.  You will observe the word  "SPLIT" just above the VFO B 
frequency (right side)  and TX  above the letter B for VFO B .


4.  Adjust VFO B for the desired TX frequency.  (use the small knob)

5.   VFO A is the receive frequency.

That's it.

73

Bob, K4TAX


On 11/6/2023 2:36 PM, elecraft-requ...@mailman.qth.net wrote:

Message: 8
Date: Sun, 5 Nov 2023 21:12:15 -0500
From: Richard
To: Elecraft Reflector
Subject: [Elecraft] K3S Split Operation
Message-ID:
Content-Type: text/plain;   charset=utf-8

I am having trouble understanding both the manual and N6FN?s Mini-manual when 
it comes to Split operation. I follow the ?directions? over and over but 
nothing happens.

Does the fact that my K3S does not have a sub receiver mean that I can?t work 
split?

If I?m wrong about that I would really appreciate a step-by-step How-To lesson 
in working split.

Thanks.

Cheers,
Richard Kunc
W4KBX

-


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[Elecraft] Digital mode power handling for KAT3

[Bob McGraw]

If I did my math correct, FT-8 is 46.42% duty cycle.     13+15 = 28.  
Therefore (13/28)*100= 46.42%


73

Bob, K4TAX


On 10/12/2023 7:33 AM, elecraft-requ...@mailman.qth.net wrote:
Message: 17 Date: Wed, 11 Oct 2023 21:40:19 -0700 From: David Gilbert 
 To: elecraft@mailman.qth.net Subject: Re: 
[Elecraft] Digital mode power handling for KAT3 Message-ID: 
<53d23883-e9e2-451d-cb5e-38e78b991...@gmail.com> Content-Type: 
text/plain; charset=UTF-8; format=flowed FT8 is definitely full duty 
cycle for its 13 second transmit period, but of course then it is idle 
for the last two period and idle for the 15 seconds it is receiving. 
Dave?? AB7E 

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Re: [Elecraft] Elecraft Digest, Vol 234, Issue 3

[Bob McGraw]

Ken et al:

From the K3S manual, page 8,  I find: "Duty Cycle   CW and SSB modes,  
100%  10 minutes key-down at 25 degrees C.   There are some additions 
restrictions for 6 meters.   This does not seem to agree with the 
information of W1HKJ.


I've been regularly running my K3S, s/n 10163 since 8/2015 at rated 
output, 100 watts, on all modes, SSB, CW, FT-8, and a couple of others 
with out any issues or concerns.   I also run the power supply voltage 
at 14.5 at the radio during transmit and 14.8 during receive.


73

Bob, K4TAX



On 10/12/2023 7:33 AM, elecraft-requ...@mailman.qth.net wrote:
Message: 16 Date: Wed, 11 Oct 2023 23:20:47 -0400 From: Ken WA8JXM 
 To: ken.k...@gmail.com Cc: elecraft@mailman.qth.net 
Subject: Re: [Elecraft] Digital mode power handling for KAT3 
Message-ID: 
 
Content-Type: text/plain; charset="UTF-8" Not just the tuner, the K3 
is not rated for full power on 100% duty cycle modes. Just like it's 
not rated or 100% key down CW. But realize that many of the modes are 
half transmit and half listen. Different digital modes have different 
duty cycles. >From the W1HKJ.com website: 100% duty cycle: Olivia, 
MFSK,RTTY 80%: BPSK, MT63 44% CW 22%:FieldHell There are more modes on 
Dave's website, but those are some of the major ones. IDK if Joe 
Taylor has similar information on his website for the modes he 
supports. It loioks like his modes may require full duty cycle. Ken

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[Elecraft] KPA500 / KAT500 and W2 watt meter question

[Bob McGraw]

Andy:

With my K3S station I use the AUX cable system between the K3S connected 
to the KAT500 and then connected from the KAT500 to the KPA500.   No 
interrupter is needed.   The AUX lines handles the proper control for 
the tuner and the amp.  I do NOT use the Key Line cables, sometimes 
called PTT, to handle T/R switching. Correctly configured, the K3S is 
set for 20 watts TUNE power and Power Per Band, as required.   I find no 
need for multiple methods.  My general philosophy is; "more connectors, 
more cables equal more problems".   KISS


In the KAT500 manual, page 5, Figure 1 Cabling Diagram, is the better 
and safer way to configure the system.  NO key line interrupter is needed.


As to the Kenwood, I have no knowledge of the system.

73

Bob, K4TAX


On 10/12/2023 7:33 AM, elecraft-requ...@mailman.qth.net wrote:
Message: 15 Date: Wed, 11 Oct 2023 23:02:09 + From: Andy Durbin 
 To: "elecraft@mailman.qth.net" 
 Subject: [Elecraft] KPA500 / KAT500 and W2 
watt meter question Message-ID: 
 
Content-Type: text/plain; charset="iso-8859-1" "I just ordered the 
KPA500/KAT500 combo and W2 watt meter for my K3S. Should I use the key 
line interrupt connected to the W2 watt meter or should I connect the 
key line interrupt to the KAT500? Do I even need to use key line 
interrupt with the K line set up?" Why would it hurt to have multiple 
ways to inhibit KPA500 keying? I run a Kenwood rig so no AUXBus 
control but my KPA500 key line passes through my LP-100A and through a 
SteppIR inhibit circuit. Both can open the key line. In addition my 
station controller can assert KAT500 key inhibit by serial command. 
KAT500 key line inhibited is my default condition. I only allow the 
key line to be enabled if several critical checks have passed. (e.g. 
KAT500 frequency, KPA500 band selection, Kenwood drive power setting.) 
I'll do anything I can to avoid being on the list of people who fried 
their KPA500. I can fix stuff but I'd prefer to chase DX. 73, Andy, k3wyc

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[Elecraft] Digital mode power handling for KAT3

[Bob McGraw]

Ken:

I have a K3S with the internal tuner.  I find no issues nor concerns in 
running 100 watts in any mode.  Page 79 of the manual does not address 
any reduced power requirement other than operating with a 20:1 SWR (20 
watts).


73

Bob, K4TAX


On 10/12/2023 7:33 AM, elecraft-requ...@mailman.qth.net wrote:
Message: 7 Date: Wed, 11 Oct 2023 12:50:38 -0400 From: 
 To:  Subject: 
[Elecraft] Digital mode power handling for KAT3 Message-ID: 
<06cf01d9fc63$10461310$30d23930$@gmail.com> Content-Type: text/plain; 
charset="us-ascii" Hello. I recently bought a very nice K3 from a 
friend. It has the KAT3 auto-tuner installed. Due to the duty cycle of 
most digital modes, most, if not all, external auto tuners are 
"de-rated" for digital modes. I haven't been able to find any 
reference to this for the KAT3. Does anyone know the power handling 
capability of the KAT3 for digital modes? Thanks in advance. 73, Ken, KJ9B

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[Elecraft] KPA500 / KAT500 and W2 watt meter question

[Bob McGraw]

Glenn:

In the KAT500 manual, page 5. Figure 1 Cabling Diagram is the better way 
to connect the items.  It does not use the key line interrupt. That is 
the configuration which I have used, very successfully, for years.


In the K3S, set the MENU for 20 watts TUNE power, and from the CONFIG 
menu PWR SET to Per Band.


73

Bob, K4TAX



On 10/10/2023 7:18 AM, elecraft-requ...@mailman.qth.net wrote:
Message: 23 Date: Tue, 10 Oct 2023 05:17:26 -0700 From: Glenn Maclean 
 To: elecraft@mailman.qth.net Subject: [Elecraft] 
KPA500 / KAT500 and W2 watt meter question Message-ID: 
<3a0e28e4-8411-4394-a880-0fec58bf3...@att.net> Content-Type: 
text/plain; charset=us-ascii I just ordered the KPA500/KAT500 combo 
and W2 watt meter for my K3S. Should I use the key line interrupt 
connected to the W2 watt meter or should I connect the key line 
interrupt to the KAT500? Do I even need to use key line interrupt with 
the K line set up? Thanks in advance Glenn WA7SPY

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[Elecraft] Elecraft] Behringer XM1800S Mic

[Bob McGraw]

Be sure the wiring is correct as to the XLR 3 and the Foster 8 pin 
connector.


XLR pin #1 to Foster pin #8

XLR pin #2 to Foster pin #1

XLR pin #3 to Foster pin #7

Be sure in the Config menu, FP.H source is selected and Bias is OFF.   
See page 13 in the manual.


I use a Behringer XM8500 or Shure SM-58 very successfully.   Both sound 
good but a bit different.


73

Bob, K4TAX


On 9/28/2023 8:31 AM, elecraft-requ...@mailman.qth.net wrote:
Message: 15 Date: Wed, 27 Sep 2023 13:29:16 + (UTC) From: 
E-mail-Server  To: "elecraft@mailman.qth.net" 
 Subject: [Elecraft] Behringer XM1800S Mic 
Does not work on k3 Message-ID: 
<1663567528.2454337.1695821356...@mail.yahoo.com> Content-Type: 
text/plain; charset=UTF-8 Im trying to connect the Behringer XM1800S 
as an external mc on my K3. I have tried all of the configurations 
possible in the MAIN menu with no joy.? Before I break down ( and 
suffer my XYL's consternation) to buy a compatible Heil product, does 
anyone have any suggestions?? I have the same setup I am trying to use 
on a Heil proset with no issues.? I suspect the mic is the primary 
issue since it is not an electret mic. Any suggestions are 
appreciated. PatAB8PS(former W8LNO)

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[Elecraft] Yamaha CM500

[Bob McGraw]

I have the Koss SB-45.  Works great and sounds good both ways although I 
don't normally use a headset.   I do find, as I recall, it has a dynamic 
mike element and does exhibit a good amount of proximity effect.  Uh, 
maybe that is the SB-40.  One is dynamic and one is electrect. ???


73

Bob, K4TAX


On 8/7/2023 6:10 PM, elecraft-requ...@mailman.qth.net wrote:

Message: 21
Date: Mon, 7 Aug 2023 16:26:07 -0600
From: David Herring
To: Elecraft Forum
Cc: Henry Pfizenmayer
Subject: Re: [Elecraft] Yamaha CM500
Message-ID:<50f2d6d7-ec32-413b-98dc-1e7ddbe2c...@gmail.com>
Content-Type: text/plain;   charset=utf-8

I have been told that the Koss SB-45 is the replacement for the Yamaha CM500.  
I have not as yet ordered a pair to try them myself, I am merely relaying what 
I have heard.  Might be worth researching if anyone?s looking for a CM500 
replacement.  I see there is a pair on Amazon for about $30 presently?

73,
Dave - N5DCH

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Re: [Elecraft] A dumb question about lightning

[Bob McGraw]

Fred is absolutely correct on this point.  The NEC {National Electrical 
Code} clearly states that all driven grounds MUST be bonded to the AC 
mains service entrance ground.  There is NO exception to this 
procedure.  An exception does exist  when the structure is XX number of 
feet distant from the AC mains service. (I forget the distance number).


In general, your station ground must be bonded to the AC mains ground.   
Otherwise, your equipment is in the current path between two or more 
different ground points.  Even with antennas disconnected or grounded, 
and the station turned off, the path of least resistance between the two 
grounds is through your equipment.   That will definitely let the smoke 
out of the box. Not good.


Please deal with science and facts.  DO NOT rely on "old ham lore" that 
is most likely incorrect and gets more and more incorrect with the 
telling or writing.


73

Bob, K4TAX



Message: 20
Date: Mon, 31 Jul 2023 13:20:06 -0700
From: Fred Jensen
To: Geoffrey Feldman
Cc:elecraft@mailman.qth.net
Subject: Re: [Elecraft] A dumb question about lightning
Message-ID:<87985aa1-b606-cec8-f07c-5edbadbdc...@gmail.com>
Content-Type: text/plain; charset=utf-8; format=flowed

Be very careful of advice regarding lightning protection.? There are
some very good sources, starting with the NEC and including material
from ARRL.? Some is somewhat non-intuitive.? For example, the NEC
requires that any additional "earth electrodes" [aka ground rods] be
bonded to the service entrance earth electrode with a low inductance
path. There's been quite an array of advice circulating here recently,
much of it wrong, some dangerous.

73,

Fred ["Skip"] K6DGW
Sparks NV DM09dn
Washoe County

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[Elecraft] A dumb question about lightning

[Bob McGraw]

No such thing as a dumb question about lightning.  I spent 15 years in 
South Florida.  I've seen some lightning!  Welcome to KY.  I'm in  
middle TN and do understand lightning.



The ARRL publication by Ward Silver, Grounding and Bonding for the 
Amateur, is about the best compilation available and understandable.


Three points I consider as mandatory:

(A)  All efforts for lightning protection should be implemented outside 
of the house.  Never inside.


(B)  All driven station and tower ground rods must be bonded together 
and back to the AC Mains ground outside of the structure.


(C)  Each piece of equipment should be bonded to a common point such as 
the station power supply , using dedicated bonding jumpers.


All efforts are toward mitigation of lightning damage.

73

Bob, K4TAX


On 7/28/2023 4:14 PM, elecraft-requ...@mailman.qth.net wrote:

Message: 19
From: Al Lorona
To: Elecraft Reflector
Subject:  A dumb question about lightning

Please don't laugh at me; I'm a transplant from a region of the country with 
essentially no lightning to a region where you have to worry about it quite a 
bit.

We had a doozy of a storm last night, with lots of lightning overhead. I felt 
like a sitting duck, even though I had grounded both sides of the balanced 
feedline of the antenna, switched the antenna switch to the middle (grounded) 
position, and even disconnected the coax leading to the K3's rear-panel antenna 
port.

Whenever lightning happens, I always wonder if it really is in fact better to 
ground everything. Because, doesn't that essentially make a lightning rod of 
the antenna? If I simply disconnected the antenna and left it floating, 
wouldn't it be less likely to attract a lightning bolt?

I'm of the belief that it's better to try to avoid a direct hit than to attract 
one and trust your grounding system to do its thing. I'm of the belief that no 
grounding system is perfectly effective.

Al? W6LX/4



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[Elecraft] K3 Power hunting on FT-8

[Bob McGraw]

Whereas it was written:   "The manufacturer says use 5 bars of ALC, end 
of story.  I don't buy that at all." (W3IP)


The manufacturer DOES NOT say use 5 bars of  ALC.   However, it does say 
use 4 bars of audio as displayed on the ALC scale and the 5th bar 
flickering.  This is per the writer of the ALC routine. This prevents 
power hunting.  The actual Automatic Level Control (ALC) starts AFTER 
the 5th bar.


73

Bob, K4TAX

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[Elecraft] K3 Power-hunting on FT8

[Bob McGraw]

Oh my goodness!

What Don, W3FPR wrote  is 100% correct!

Whomever K3 user told you to EVER use the output control other than MAX at ALL 
TIMES needs to go back to learning.  They are NOT helping you. (NK7I)

I'd go back to what Elecraft says in their manual.  (K9YC)

Again, READ THE K3 OWNERS MANUAL and do what the manufacturer says. (W4TV)


What "others" told is frankly just OLD HAM LORE.  The more it is told the more 
incorrect it becomes.

There is a correct or right way, and there are many incorrect or wrong ways.   
I don't find any in between.
 
Bob, K4TAX


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[Elecraft] Is KX3 going obsolete

[Bob McGraw]

AMEN   Just keep on keeping on.

73

Bob, K4TAX


On 7/18/2023 11:43 AM, elecraft-requ...@mailman.qth.net wrote:


Good grief.? Get a life.? Not everything in this world is racist, discriminatory
or homophobic. In fact, I'm old enough to remember when being discriminating was
a virtue, a sign of good taste; gay was happy and binary was a number system.?
But then I'm an elderly heterosexual white male, so what do I know?


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[Elecraft] Field Day Operation

[Bob McGraw]

Folks, if you intend to operate ANY digital mode for Field Day or any 
other day for that matter, please read the radio manual with regard to 
passing audio from the computer to the radio and learn the radio 
adjustments and what they do and how they are used. Also read the manual 
regarding correct configuration of the computer and application 
software.  One must understand at least 3 different systems.  (a) the 
radio adjustments, (b) the computer operating system, (c) the software 
application.


Yes, ANY radio incorrectly configured and adjusted WILL TRANSMIT CRAP!   
Don't be laughed at and called a LID.  RTFM


There is absolutely NO reason for transmitting a dirty or distorted or 
wide signal.    NONE!  If your signal is dirty, distorted, or wide, it 
is clearly the fault of the operator.


73

Bob, K4TAX


On 7/12/2023 3:33 PM, elecraft-requ...@mailman.qth.net wrote:

Message: 1
Date: Sat, 8 Jul 2023 15:18:13 +

Subject: Re: [Elecraft] Field Day Operation


"but I guarantee that it can be easily done with a TS-590S as well.  You just didn't 
do it right."

Ok, please tell me how to do that.  Specific settings please from a test that 
you actually ran with a TS-590S.

My tests had all audio drive sliders to max and ALC meter hard on the stop.  
Clean signal for FT8 and PSK.  I didn't believe that was possible until I ran 
the tests.


Andy, k3wyc


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[Elecraft] K3s Receive EQ

[Bob McGraw]

Regarding "quick on the fly adjustments", I don't view an 8 band EQ as 
one that would have quick on the fly adjustments.


Depending on your choice of sidetone frequency, the selection of RX EQ 
frequency and amount of attenuate and boost would seem adequate.   I 
agree with what Jim, K9YC, says about this.  In order, attenuate first 
and boost last.  There is less phase distortion.


73

Bob, K4TAX


On 6/26/2023 8:13 AM, elecraft-requ...@mailman.qth.net wrote:

Message: 20
Date: Mon, 26 Jun 2023 02:05:33 -0400
From: Richard
To: Elecraft Reflector
Subject: [Elecraft] K3s Receive EQ
Message-ID:
Content-Type: text/plain;   charset=utf-8

I love my K3s, warts and all, but I want a way to tailor incoming audio for 
better readability in special cases. Yes, I know about the built-in function, 
but that's hardly comfortable for quick, on-the-fly adjustments.

Can you recommend/suggest an outboard equalizer, ideally 8 bands, that can be 
used to tune the headphone audio only?

1. This unit would be entirely external to the K3s, so its output level would 
have to be sufficient to drive headphones.

2. This unit would ideally be 9" by 9" maximum and 8" by 5" minimum, dictated 
by the available placement space in my station. There?s lots of wiggle room here.

3. 12 volts DC is available to power it.

4. An in/out (inline/bypassed) switch is essential.

Links to look at would be great.

Fingers crossed ? VISA paid up and ready to rock and roll.

Cheers

Richard Kunc
W4KBX

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[Elecraft] FS8Call Eureka

[Bob McGraw]

Regarding using USB mode, if you have any EQ or processing applied, it 
will also be applied to the data signal on transmit.    It is best to 
use the Data/Packet mode on the radio because that mode automatically 
negates any EQ or signal processing.   Plus it is always generates the 
signal in USB for all bands.   The data convention is always USB 
regardless of band.


73

Bob, K4TAX


On 6/5/2023 9:58 AM, elecraft-requ...@mailman.qth.net wrote:

Message: 6
Date: Thu, 1 Jun 2023 06:33:29 + (UTC)
From: Karl W Hubbard
To: Elecraft Reflector
Subject: [Elecraft] FS8Call Eureka
Message-ID:<1369509914.5056040.1685601209...@mail.yahoo.com>
Content-Type: text/plain; charset=UTF-8

Incredibly, I have stumbled, bumbled, and fumbled my way to get 
JS8Call to provisionally work on the KX3. It is the equivalent of 
trying to sight your rifle in and finally getting your shot on the 
paper after using up nearly all your ammo. From there you can fine 
adjust your scope, ie., you now have something to work with.
My break through came after watching Dummyload's You Tube video 
'"Connecting the KX3 to the SignaLink." At the end he mentioned that 
the ICOM 7200 didn't need a SignaLink which made me deduce that the 
KX3 would for JS8Call. That and after all the endless permutations and 
combinations of different settings.?
I set my mic bias to "off", the ptt to on, and the AFX to "off" and 
made the cable connections as he suggested in his very concise video.
My SignaLink transmit and receive settings arbitrarily were both 
dialed? to @11:00 and the Delay to 7:00.?
The other issue was setting my Lenovo computer audio and speaker sound 
cards? to CODEC which is the generic one used for most Windows 11 
computers I think.


Interestingly, I did not select the KX3 rig option? from the drop down 
menu. I left it blank!?

On the KX3, I set the mode to USB.
Hurriedly scribbled this all down.? Hopefully I can get it all to work 
again tomorrow and to lock this in.

Merry 73's to all, and to all a goodnight!
Karl, AF5LQ

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[Elecraft] JS8call

[Bob McGraw]

When switching to Data/Packet be sure the radio RX BW is 2.7 kHz.  The 
BW info is stored by mode in the radio.


On WSJT-X Wide Graph, set the Bin/Pixel value to 4.

73

Bob, K4TAX


On 6/5/2023 9:58 AM, elecraft-requ...@mailman.qth.net wrote:

Message: 1
Date: Wed, 31 May 2023 12:53:32 -0400
From: David Haines
To:elecraft@mailman.qth.net
Subject: Re: [Elecraft] JS8call
Message-ID:<6147a9fa-5f90-edca-e8a0-5b8e7968c...@bates.edu>
Content-Type: text/plain; charset=UTF-8; format=flowed

After years of success with FT8 here's a puzzle I've never solved: For
FT8 when I set WSJT-X radio settings to Data/Pkt, the WSJT-X waterfall
display seems useless, with all the signals concentrated at the center
of the waterfall.
For that reason I always set WSJT-X to USB and get a useful waterfall.?
Why does this happen and am I missing something?

david

KC1DNY
KX3? and now a brand new KX2.

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Re: [Elecraft] Odd K-3 Symptom

[Bob McGraw]

Pete:

(a)  Check all PL-259 connectors are more than finger tight.  I use a 
pair of 4" Channel Locks to snug mine.  Solves many problems.


(b)  Make sure all RF coax antenna cables have proper common mode 
chokes.   This depends largely on the type of antenna and where best to 
install the chokes.


(c)  You may need to add some common mode chokes on various cables to 
and from the computer.


(d)  Each piece of station equipment should be bonded to a common point, 
using a dedicated bond jumper.  A don't advocate using the daisy chain 
method but prefer the star bonding method.


73

Bob, K4TAX


On 5/29/2023 8:45 PM, elecraft-requ...@mailman.qth.net wrote:

Message: 12
Date: Mon, 29 May 2023 07:54:54 -0400
From: Pete Smith N4ZR
To:elecraft...@yahoogroups.com, Elecraft List
,   "n1mmloggerp...@groups.io"

Subject: [Elecraft] Odd K-3 Symptom
Message-ID:
Content-Type: text/plain; charset=UTF-8; format=flowed

During the WPX CW contest, I was having some trouble with RF getting
back into my K-3 from my KPA-1500, displaying HI RF warnings and
magically adjusting my audio gain after each transmission.? Tightening
ground connections effectively solved? the situation, but during the
last few hours, I started noticing ERR PTT warnings very briefly after
each transmission.? I was using N1MM Logger+ to control PTT, and have
just confirmed that this error only occurs when N1MM is controlling
PTT.? Any ideas?

-- 73, Pete N4ZR

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[Elecraft] Where to put the wattmeter

[Bob McGraw]

While I totally agree with Alan, N1AL, I fear that one who is reading an 
external power meter located in the feedline after the tuner will be 
mislead by the power indications.  At the same time, SWR indications are 
typically valid.


Case and point.   On one of my antennas, on a frequency where the SWR is 
high, the FWD power indicated on the external meter is 200 watts.  No 
way the radio is producing 200 watts.  At the antenna matched frequency 
the external meter indicates 100 watts.


The original post indicated with the OPs K3S the P3 Sensor located after 
the KAT500 antenna tuner was showing a power value of some 300 watts or 
so.  Even more non believable values with his KPA500.  Thus my reason 
for questioning the position of the measuring sensor in the feed line.   
Most power measurement devices are calibrated for a known impedance, 
normally 50 ohms. Therefore placing them in the feedline where an 
unknown impedance exist, one will also have a false power indication.


Exceptions are a calculating power meter that measures both voltage and 
current to determine power.  Most power meters I find in ham usage are 
only voltage sensing devices.


That's all.

73

Bob, K4TAX



Date: Mon, 10 Apr 2023 10:03:10 -0600
From: Alan Bloom
To:elecraft@mailman.qth.net
Subject: Re: [Elecraft] Where to put the wattmeter
Message-ID:
Content-Type: text/plain; charset=UTF-8; format=flowed

I changed the Subject line since this is a new topic.

If the wattmeter (in this case the P3 sensor) is placed after the tuner
then it will read the SWR of the antenna.? To determine the net forward
power, just subtract the reflected power from the forward power.

To calculate reflected power, use the equation:

P(ref) = P(fwd) * [(SWR-1)/(SWR+1)]^2

Since the K3 and K4 already have a built-in wattmeter located before the
tuner, it makes sense to me to put the P3 sensor (or external wattmeter)
after the tuner so you can see what is going on with the antenna.

Alan N1AL

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[Elecraft] P3 woes - repaired but now claims my K3s, puts out 873W!

[Bob McGraw]

My question would be "where is the sensor for the P3 located in the feed 
system?"  It should be between the KPA500 output and the KAT500 input.   
Therefore, when the KAT500 resolves a match, then the line between the 
KPA500 output and KAT500 input is nominally 50 ohms.


If the sensor is located after the KAT500, thus in the feedline to the 
antenna, the impedance and thus the voltage on the line, will impact the 
the indicated value.   Most all power reading sensors are voltage 
reading devices, referenced to 50 ohms nonreactive and should be located 
in a 50 ohm line which has a nonreactive load.  Most power indicating 
devices are calibrated for 50 ohms.   There are some exceptions.


As example;  if the impedance of the antenna is reactive ( most are ) 
and about 200 ohms Z  being fed though 50 ohm coax for the feedline and 
the power is 500 watts, the voltage is about 316 volts.    If the 
impedance were 50 ohms and the power is 500 watts the voltage would be 
about 158 volts.   Here it is easy to see, using a voltage sensing 
circuit, the power indication would be incorrect by some significant 
magnitude.


I've considered adding a power/SWR monitor to my P3 but it would be in 
the coax to the antenna.  I use the internal tuner in my K3S to resolve 
a match, thus the power measurement would be after the ATU in the radio 
and the actual load Z is really unknown.   The only way to determine if 
the power indication is correct with the P3 is to use a 50 ohm dummy 
load or place it in the RF path which is 50 ohms nonreactive.


73

Bob, K4TAX


Message: 2
Date: Fri, 7 Apr 2023 16:15:31 -0600
From: Alan Bloom 
To: Elecraft Reflector 
Subject: Re: [Elecraft] [P3] P3 woes - repaired but now claims my K3s
puts out 873W!
Message-ID: <3fbef504-357c-f46e-748f-d11e1a822...@sonic.net>
Content-Type: text/plain; charset=UTF-8; format=flowed

Hi Dave,

There is a "SensorCal" entry in the Transmit Monitor Menu, but I don't
think it has enough range to correct such a large error.

There is also a "MtrScale" entry to set the full-scale power on the
meter display.? Does the reading change when you change the scale?

In addition to the I/O board, the problem could also be on the Sensor
board (the small board that connects the sensor RJ45 connector to the
I/O board).? If one of the resistors on this board went open or shorted
it could cause a power error.? Is the reverse power reading way off as
well?? (i.e. does the SWR read wrong for SWR not close to 1:1?)? If so,
that could be due to a resistor problem on the Sensor board.

 > I'm wondering if the new revision I/O board is somehow incompatible
with the older TX Monitor board,

No I don't think so.? There was a minor change in the sensor design at
one point but it was just a capacitor change to improve the detected
bandwidth so the envelope would display correctly.? (The same sensors
are used for the W2 wattmeter.)

73,

Alan N1AL


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[Elecraft] Mysterious T

[Bob McGraw]

Page 12 in the manual states;  "T indicates FM/Tone, CW/DATA text 
decode, or AM-Sync auto-tracking."


73

Bob, K4TAX

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[Elecraft] Elecraft 80M SSB Net Report

[Bob McGraw]

Regarding some of the net and QRM issues mentioned in the attached post, 
the ARRL Volunteer Monitor organization can easily deal with deliberate 
interference to nets.    Remember, NO ONE or NO ORGANIZATION owns any 
frequency on any band.


Likewise, hams who have a Tech or General class license are very easy 
hunting when operating in the Advanced or Extra frequency segment of any 
band.


A good operator, selecting 3 kHz above or below any net is good 
operating practice.   For those that insist on transmitting wide band 
audio, do so at your on risk.


73

Bob, K4TAX


On 1/30/2023 12:30 PM, elecraft-requ...@mailman.qth.net wrote:

Message: 23
Date: Mon, 30 Jan 2023 12:30:17 -0600
From: "Dave New, N8SBE"
To:elecraft@mailman.qth.net
Subject: Re: [Elecraft] Elecraft 80M SSB Net Report
Message-ID:
Content-Type: text/plain; charset=UTF-8; format=flowed

Steve,

Yeah, we got chased away from 3775 by a persistent adjacent GA net
meeting at the same time on 3778.  You'd think we could co-exist, but
one station in GA on there insisted on overdriving his amplifier causing
splatter +-5 kHz either side of what should have been a nominal 3
kHz-wide channel.

Rather than start a cat-fight on the air (or by email) we decided the
batter part of valor was to move elsewhere.

3784 kHz has been good for us the last several weeks, but last night at
least a half-hour before our net time, there was a conversation going on
there between two stations, one of which was signing an "F6" (France)
call sign, so my guess is they were speaking French, which is not my
forte, by any stretch of the imagination.

It turned out that 3781 was clear, and remained so for us, so we moved
down 3 kHz and operated the net there.  I've been using (mis-using?)
Netlogger, and when I start up the net, I post the current frequency, so
if you go to the Netlogger site during net time, you should be able to
find us quite easily.

I'd really like to move us into the General portion of the band, so more
folks can join in, but that's a tough job on 80 meters, even on a
Sunday.  Generally that portion of the band is wall-to-wall with nets
and scheduled conversations (old friends, etc) during the evening hours
all days of the week.  The ARRL net directory is not very friendly for
searches, like "what frequencies are NOT in use in the General portion
of the band on Sundays at 9pm ET".

Suggestions for how to solve that mystery are welcome (I do have a P3,
and know how to use it, just to head off the more obvious replies). 

73,
-- Dave, N8SBE

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[Elecraft] KPA1500 Faulting for High SWR inappropriately

[Bob McGraw]

Use an antenna analyzer to determine the actual complex antenna 
impedance.   I've always viewed SWR as more of a hocus pocus value, easy 
value to obtain, but very broad in definition as it is a ratio between 
two impedance, both usually unknown.


 Chances are the antenna or a connector or feed line or lightning 
protection device is breaking down under power.   The SWR meter won't 
show this.


73

Bob, K4TAX

On 12/19/2022 4:55 PM, elecraft-requ...@mailman.qth.net wrote:

Message: 19
Date: Mon, 19 Dec 2022 20:59:21 +
From: "David F. Reed"
To:"elecraft@mailman.qth.net"  ,
kpa1...@groups.io
Cc: Elecraft Support
Subject: [Elecraft] KPA1500 Faulting for High SWR inappropriately
Message-ID:
Content-Type: text/plain; charset=UTF-8; format=flowed

My KPA1500 has started faulting inappropriately for High SWR.

I say inappropriately because all 2 of my SWR meters (K4D, KPA1500,
Palstar HF-AUTO) show an SWR of between 1.1:1 and 1.2:1. with just the
K$ transmitting and also with the KPA1500 in fine as it faults out.

Any ideas?

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[Elecraft] K3 EZ link

[Bob McGraw]

If you are looking for K3 EZ application it can be found at this link as 
a zipped file.  Thanks to Jim, N7US for the upload.


https://groups.io/g/Elecraft-K3/files/K3_EZ

There are 3 versions and I understand the latest one has bugs. The 
author is a SK.


I have #2 running on my Windows 10 Pro machine.  I did have to install 
Microsoft Framework 2.0.


73

Bob, K4TAX

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[Elecraft] Running high power

[Bob McGraw]

In running my KPA500/KAT500 combo I found no issues with any RFI of any 
type.


Now what I did find, if I hit it too hard, it would flat top and 
generate all sorts of crap.  This sould get into the computer and lock 
up WSJT-x.  Also It would turn on or turn off one of the TVs on 
satellite service.   And the satellite receiver would change channels. 
(That really annoyed the XYL)


I find the amp to be very clean up to a point.  Exceed that point, even 
the slightest amount, and it turns into a quasi square wave generator.  
No amount of filtering I tried would remedy the issue. The only solution 
is to set the drive power to attain 500 watts or less as measured on a 
reliable power meter.  Then don't let the exciter exceed that drive 
level.  I then set the PWR CAL via the amp menu for the correct value.  
This must be done on each band using a known good dummy load.


I used my K3S to drive the amp and had the PWR SET PER BND active.   The 
amp does require slightly different drive power amounts on different 
bands.   I also set my TUNE PWR in the radio for 20 watts.   This would 
always drive the amp to near rated output.


The station antennas, the coax center fed 80/40M has a 1:1 balun at the 
feed-point, the 160M 1/2 wave wire is center fed with balanced line and 
a custom hybrid balun at the operating desk. Each piece of station 
equipment is bonded by a dedicated conductor to the station power supply 
ground terminal.    Being on the 2nd floor of the house, I do not use 
any external station ground. Lightning protection is accomplished 
outside of the house.


Hope this helps.

73

Bob, K4TAX

On 11/23/2022 9:58 AM, elecraft-requ...@mailman.qth.net wrote:

Message: 13
Date: Tue, 22 Nov 2022 22:36:46 + (UTC)
From: Al Lorona
To: Elecraft Reflector
Subject: [Elecraft] Running high power
Message-ID:<1647168817.1936686.1669156606...@mail.yahoo.com>
Content-Type: text/plain; charset=UTF-8

I'm really curious to ask those on this list who run high power:

Do you find that you get into all kinds of devices around the house?

I ran the KPA-500 in an extended manner for really the first time during the 
Phone SS and immediately:

1/ interfered with FM broadcast radio.

2/ caused the internet to drop out every time I keyed up on the lower bands.

Am I the only one? Those of you who run high power all the time... how do you 
deal with these annoyances?

Al? W6LX/4


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[Elecraft] Recommendation for Microphone for K3s?

[Bob McGraw]

Likewise, I'm a retired pro audio engineer, studio and live music.  The 
CM500 is a very good headset and plugs directly into the rear of the 
K3S.  Turn on the bias.   They are available from Sweetwater Sound (no 
connection to me) for about $60.  I also use the Koss SB40 ($29 on 
Amazon) which has a dynamic mike.  One has to be careful with the 
mike-to-mouth placement as it is a dynamic mike (no bias required) and 
thus is prone to proximity effects or boosted low end.  Taking a 
different approach I use a Shure SM-58 ($100) on a boom.  I did make my 
own XLR-3 to Foster 8 pin cable. Very easy to do and connects to the 
front panel MIC connector.  No bias required.  I also have used a 
Behringer XM8500 ($29) with very similar results as the SM-58.  The 
SM-58, or its like in wireless form,  is a very popular stage vocal mike.


One factor I've observed and stressed is "proper microphone technique".  
That is proper placement of the microphone with regard to the mouth.  I 
find many hams have been taught incorrectly in this regard or perhaps do 
not understand the relationship that exists.  One needs to experiment 
with a specific mike and their voice in order to attain desired 
results.   Many dynamic microphones will have proximity effect which 
will make them bottom heavy or bassy.  Simply back the mike away from 
the mouth to correct the concern.  Many microphones have extended high 
end response.  This produces lots of lip and mouth and breath/nasal 
sounds.  Again, correct placement above the mouth, or to the side or 
below the mouth usually corrects the concern. And of course, proper 
adjustment of microphone gain and any compression is mandatory with each 
mike.


Jim, K9YC recommendations for TX EQ is an excellent starting point.  In 
my case, I've tweaked the numbers a wee bit to suit my voice and my 
microphone choice.


Listen to your signal by recording it and then playing it back from the 
various SDR remote receivers around the country.    That way you know 
how your station sounds.


73

Bob, K4TAX


On 11/2/2022 9:44 AM, elecraft-requ...@mailman.qth.net wrote:

Message: 18
Date: Tue, 1 Nov 2022 17:48:31 -0700
From: Jim Brown
To:elecraft@mailman.qth.net
Subject: Re: [Elecraft] Recommendation for Microphone for K3s?
Message-ID:

Content-Type: text/plain; charset=UTF-8; format=flowed

I strongly agree with Rick's advice. I'm retired from pro audio, did
lots of live recording, still have some great pro mics, but I've been
using the CM500 since around 2009. I can't think of a better choice. I
find the headphones comfy enough for a long weekend contest, and they
sound great!

73, Jim K9YC

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[Elecraft] K3 INTERFACE WITH LDG Z100A

[Bob McGraw]

I purchased a Z100A with the idea of interfacing it to a specific brand/model 
of radio.  I investigated the Z100A requirements to initiate the control of the 
tuner via the transceiver.   From my earlier work, I don't see there is a 
command from the K3 that will support the requirements of the Z100A.  However, 
there are many ICOM radios that do have the provision.  Thus the command comes 
from the radio.

From the LDG manual:

"The LDG Z-100A includes the IC-104 DC power cable, as well as a three 
foot IC-100 Icom interface cable. However, interface cables for a 
plethora of other radios are available as an optional purchase, 
definitively making the Z-100A the last tuner you'll ever need to purchase.


Press "Tune" on Tuner - Keys Automatically

 * IC-105 Alinco interface cable - uses EDX-2 jack, DX-70 and DX-77
 * IC-108 Yaesu interface cable - uses TUN/LIN and KEY jacks, FT-891,
   991/A, 857, 897, 100
 * IC-109 Yaesu interface cable - uses TUN/LIN jack, FT-DX10, 1200,
   FT-950, 450 (NOTE: Do not select external tuner in settings)
 * IC-115 Yaesu interface cable - uses LINEAR jack, FT-DX101D, 3000
 * IC-106 Kenwood interface cable - uses AT-300 jack
 * IC-105 Alinco interface cable - SR8T, SR9T"
 * Compatible with any Icom radio that is AH-4 or AH-3 compatible. (6M
   tuning from Tuner button for radios that are only AH-3 compatible)
 * Partial radio list: IC-706, 703, 718, 7000, 7100, 7200, 7300, 7410,
   746, 756, 7600, 7610 (and all variants).

I find nothing to indicate the LDG100Z will interface with the K3.  In 
reviewing the signals on the ACC connector on the K3, I do not find one 
dedicated to the TUNE function. See page 20 in the manual, ACC(Accessory I/O)

73
Bob, K4TAX




Message: 13
Date: Fri, 02 Sep 2022 16:46:28 -0500
From: greg best
To:
Subject: [Elecraft] K3 INTERFACE WITH LDG Z100A
Message-ID:<75a8ccf8-062b-4c74-94d9-d6b51d5d2...@contoso.com>
Content-Type: text/plain;   charset="UTF-8"

I have tried to find a cable that goes from my K3 to the LDG Z100A tuner but 
all I see is just a cable with a Molex like connector going to the tuner and 
nothing on the other end of the K3 except bare wires (i.e. no connector). Does 
the tuner have to get connected to the K3 ACC jack?? Or does someone have a 
wiring diagram so I can marry the correct connections between the 2 units?

 


73?s,

Greg N9GB

O
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[Elecraft] INRAD W1

[Bob McGraw]

David:

The Inrad W1 uses a dynamic mike so the bias must be OFF.  As to gain, 
set to High and adjust the front panel MIC gain for an indication of 4 
to 6 bars indicated on the ALC scale with normal speech.  Then set the 
CMP for about 10 dB peaks on the CMP scale. Then adjust the VOX gain 
such that it trips as you desire.  I use 015.    Try to keep the ANTIVOX 
at a lower level.  I use 005.  The VOX hang or delay is set via the 
DELAY value on the front panel. I use 0.16.


Position the mike to the side of your mouth and slightly above to 
prevent breath pops and nasal snorts.


Good sounding mike.  You'll need to set the TX EQ as follows: 50Hz @ 
-16, 100Hz @ -16, 200H @ -12, 400Hz @ 0, 800Hz @ 0, 1.60kHz @ +3, 2.4Khz 
@+3, 3.2kHz @ +6.  If you desire a bit more low end on voice then set 
the 200 Hz to -6.  If it is a bit bright then bring the 2.4 kHz and 3.2 
kHz down 3 db each.  Remember, it is always better to attenuate first, 
than to boost.


73

Bob, K4TAX



On 8/26/2022 7:15 PM, elecraft-requ...@mailman.qth.net wrote:

Message: 24
Date: Fri, 26 Aug 2022 20:15:32 -0400
From: David Smith
To:"elecraft@mailman.qth.net"  
Subject: [Elecraft] INRAD W1
Message-ID:
Content-Type: text/plain; charset="utf-8"

I recently purchased an INRAD W1 for my K3 wanted comments on setting pf the K3 
mic for L(low) or H(high) gain range.
I have always used the Elecraft Proset K2 which K3 is set L and bias on.  Have 
turned bias off for the INRAD W1.  From what I have been able to find, the 
INRAD W1 is 600 ohm and comments have been set to L.  But, my K3 will not key 
the VOX under the L setting and I have to set the K3 to H for high gain for the 
K3 VOX to eky.
Comments appreciated.

Thanks

David ND4Y


--
Bob, K4TAX

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[Elecraft] KIO3 failure mode

[Bob McGraw]

Many faults occur via the station ground system.  This fault indicated a 
difference in potential between the station ground and the AC Mains 
ground.  In many cases, the station equipment is connected between 
station ground and the AC Mains ground.   The nearby lightning strike 
produces a difference in potential between two or more grounds to which 
the station is effectively connected in series with these grounds. Thus 
the current flow is through the station equipment, even if power is off 
and antennas are disconnected.


My example:  A cow is standing under a tree during a thunder storm.  
Lightning hits the tree and the energy is dispersed through the earth in 
all directions.  Cow is connected via its 4 feet to the earth at 4 
places.   The difference in potential between the 4 connected places 
electrocutes the cow.   Lightning did NOT strike the cow.


If your station ground IS NOT BONDED to the AC Mains ground, (a) this is 
in violation of the NEC, (b) one has a high likelihood for damage in the 
event of a nearby lightning strike.


Second, each piece of equipment MUST be bonded to a common point.    
There is a difference in bonding and grounding. Station lightning 
protection and grounding is always outside of the structure, never inside.


Jim, K9YC and Ward Silver, N0AX in the ARRL book /GROUNDING AND BONDING 
for the Radio Amateur/ contains a wealth of correct information.  Use 
this information to defuse "old ham lore" regarding grounding.


73

Bob, K4TAX


On 8/24/2022 11:49 AM, elecraft-requ...@mailman.qth.net wrote:

Message: 8
Date: Tue, 23 Aug 2022 21:31:42 + (UTC)
From:cemil...@aol.com
To:"ab7e...@gmail.com"  ,
"elecraft@mailman.qth.net"  
Subject: Re: [Elecraft] [K3] KIO3 failure mode
Message-ID:<903648173.1119840.1661290302...@mail.yahoo.com>
Content-Type: text/plain; charset=UTF-8

Not owning a K3, but have the KX3..and other rigs!? Perhaps 
disconnecting the antenna (before and during an electrical storm)? from the 
shack hardware makes little boards like the K103 enjoy a longer life.? Just 
suggesting.? No disrespect in this comment.
73ChuckW4MIL


--
Bob, K4TAX
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[Elecraft] K2 versus K3 specs

[Bob McGraw]

Regardless of specs, there is one fellow when asked about the best radio 
will always answer "it is the one you enjoy using".



73

Bob, K4TAX


Message: 7
Date: Thu, 14 Jul 2022 16:44:23 -0400 (EDT)
From: brianpepperdine brianpepperdine
To:elecraft@mailman.qth.net
Subject: [Elecraft] K2 versus K3 specs
Message-ID:<50dd47e2.3064.181fe7498b7.webtop...@sympatico.ca>
Content-Type: text/plain; charset=UTF-8; format=flowed; delsp=no



I realize there are a myriad of differences between the K2 and
K3, but today I read the specs in each owners manual and was somewhat
surprised that the each is listed at about -135 dBm sensitivity (pre-amp
on for K2...pre-amp off at - 130 dBm for K2).
I was curious since I was going thru those tests on the K2/KAT100 set I
havein anticipation of any hamfest that might come around...whether
to retain or not. If this is basically what this rig does (K2) aside
from what more my K3 offers in other ways (variable bandwidth filter
etc)
then the K2 seems to be something to hold onto, pending a decent offer
I could live with.
Anyhow, I am just spit-balling and throwing this out there, FWIW.

Brian VE3HI


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[Elecraft] COM port problems

[Bob McGraw]

I suggest you perform a RESTORE function from a previous file dated 
before the problem occurred.   Or if you have a back-up system, go back 
to a known working configuration.   (You have regular computer back ups 
don't you?)


Using the K3 Utility, if communicates correctly with the radio, then 
start with a single application such as WSJT-X or FLDIGI. Don't use or 
launch  any other control or logging applications. Just run WSJT-X or 
FLDIGI direct and stand-a-lone.   If that works then you perhaps would 
be lead to believe that the configuration between the control 
application and logging application are suspect.


The approach is to launch and run only one application at a time.  If it 
doesn't work, then debug and find out why and get it working before 
moving on.  Too many variables may take eons to sort out.


73

Bob, K4TAX


On 7/1/2022 5:27 PM, elecraft-requ...@mailman.qth.net wrote:

-Original Message-
From:elecraft-boun...@mailman.qth.net
[mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Peter Dougherty
(W2IRT)
Sent: Thursday, June 30, 2022 12:28 AM
To: 'George Thornton';Elecraft@mailman.qth.net
Subject: Re: [Elecraft] COM port problems

It's possible (and I'm guessing somehow likely), but darned if I know what
to even look for. These are things that were set when the computer was built
from scratch last year, they have worked 100% reliably over thousands of
QSOs in both Commander and N1MM+ ever since, and absolutely nothing was
changed in terms of configuration or even a Windows Update in at least two
weeks. I just needed to restart the computer after moving it from a wall
outlet to a UPS, and it started going crazy from that point on.

Whatever the issue is, it seems to affect ALL the COM ports in the system
the same; neither Commander nor N1MM can open the radio port, or either of
the two rotor ports.

I did somehow manage to get Commander working (don't aske me how, it just
started), but the rotors are still no-go (and not critical at the moment).



- pjd



--
IF ONE EXPECTS COMPUTERS AND TECHNOLOGY TO SOLVE THEIR PROBLEMS,
ONE DOESN'T UNDERSTAND COMPUTERS AND TECHNOLOGY
AND ONE DOESN'T UNDERSTAND THEIR PROBLEMS."


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[Elecraft] The RIGHT way is to adjust COMP

[Bob McGraw]

Start with COMP at 0, adjust the MIC gain while speaking normal voice to 
attain 5 to 6 bars {no more} as indicated on the ALC meter.  Then adjust 
the COMP for a value to indicate about 10 on voice peaks.


For those that believe in using the "I turned it up a little bit, now 
how does that sound?" approach, . forget it.  Set it correctly as 
described above  and it will sound great.   There is a right way to do 
this.   Anything else is flying by the seat of your pants.


If you desire to have it sound different, then twiddle the EQ values 
until your hearts content.   After doing so, you may need to reset the 
MIC and COMP levels to be correct.


I much prefer to listen to my signal on a remote SDR and record my 
signal on the SDR site. Then listen to it in my shack on my speakers.  
Then I know HOW MY SIGNAL SOUNDS.   That's what is important.   I make 
adjustments from there.


As to others, they can adjust their receivers, their speakers, their 
hearing aids and a host of other things that will make ones signal 
sound..err, many different ways.  So which one of the "many 
different ways" is best?  Likely none of them.


73

Bob, K4TAX


On 6/29/2022 8:59 PM, elecraft-requ...@mailman.qth.net wrote:

Message: 10
Date: Wed, 29 Jun 2022 13:10:17 -0700
From: Jim Brown
To:elecraft@mailman.qth.net
Subject: Re: [Elecraft] Ham Qualifications, Customer Service
Message-ID:

Content-Type: text/plain; charset=UTF-8; format=flowed

On 6/29/2022 9:39 AM, Ed Cole wrote:

Note on SSB compression, I've run at 20 with no complaints of distortion
or splatter.

Dial readout is the WRONG way to set compression -- it's meaningless.
The RIGHT way is to adjust COMP for a METER reading of 10 dB on voice
peaks.

73, Jim K9YC


--
IF ONE EXPECTS COMPUTERS AND TECHNOLOGY TO SOLVE THEIR PROBLEMS,
ONE DOESN'T UNDERSTAND COMPUTERS AND TECHNOLOGY
AND ONE DOESN'T UNDERSTAND THEIR PROBLEMS."
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[Elecraft] K3 data mode not working on 6 meter band NQ3N

[Bob McGraw]

I used my K3S on 6M extensively on FT-8 over the Field Day weekend.   I 
used WSJT-X with the Radio Mode set for Fake IT .


For the radio I have DATA MD set to DATA A.  I think this is band 
specific.  There should be no difference in the set-up for 6M being the 
same for 160M - 10M.


73

Bob, K4TAX


On 6/29/2022 10:29 AM, elecraft-requ...@mailman.qth.net wrote:

Message: 4
Date: Mon, 27 Jun 2022 21:34:05 -0400
From: "Robert Ward"
To:
Subject: [Elecraft] K3 data mode not working on 6 meter band NQ3N
Message-ID: <000c01d88a8f$28e21050$7aa630f0$@com>
Content-Type: text/plain;   charset="us-ascii"

Hi

  


 My K3 will not display FT8 signals on 6 meters when set to
data mode. Data mode works on 10 thru 160 but not on 6 meters, FT8 decodes
fine when USB is selected.

Any suggestions would be appreciated!

Thanks, Bob   NQ3N


--
IF ONE EXPECTS COMPUTERS AND TECHNOLOGY TO SOLVE THEIR PROBLEMS,
ONE DOESN'T UNDERSTAND COMPUTERS AND TECHNOLOGY
AND ONE DOESN'T UNDERSTAND THEIR PROBLEMS."


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[Elecraft] Field Day and FT-8

[Bob McGraw]

AMEN!

I am using my K3S and P3 to observe the signals.  The antenna is a 4 ele 
yagi at 55 ft, fed with 75 ft of 1/2" Andrew hard-line.


I agree with Jim, the ham community in general has been dumed down in 
order to produce the numbers and dollars.  That's what politicians 
like.  The same thing is happening in our schools and colleges in order 
to get desired passing numbers.


73

Bob, K4TAX

On 6/27/2022 1:39 PM, elecraft-requ...@mailman.qth.net wrote:

Message: 4
Date: Sun, 26 Jun 2022 13:21:51 -0700
From: Jim Brown
To:elecraft@mailman.qth.net
Subject: Re: [Elecraft] Field Day and FT-8
Message-ID:

Content-Type: text/plain; charset=UTF-8; format=flowed

On 6/26/2022 1:07 PM, Lance Collister, W7GJ wrote:

I agree that there are a lot of improperly set up radios and improperly
set up software programs on the bands!

Ham radio is a TECHNICAL hobby. We are required to pass an exam
demonstrating that we understand the underlying principles, our
privileges are based on our having that understanding, and it is our
LAWFUL responsibility to transmit clean signals.

A major problem is that many hams have never bothered to learn the many
fundamentals of radio, audio, and electronics, stopping after memorizing
only enough Q to pass the exam for their license.

73, Jim K9YC


--
IF ONE EXPECTS COMPUTERS AND TECHNOLOGY TO SOLVE THEIR PROBLEMS,
ONE DOESN'T UNDERSTAND COMPUTERS AND TECHNOLOGY
AND ONE DOESN'T UNDERSTAND THEIR PROBLEMS."
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[Elecraft] Field Day and FT-8

[Bob McGraw]

I operated FD from here at the house this weekend.  Most all of my FT-8
contacts were on 6M.

I was appalled at the poor quality of many signals. Many show spurious
every 1 kHz to 2 kHz either side of their primary signal.  Several were
noted to be bands of noise on the order of 2 kHz to 3 kHz wide.  What
gives with hams and their pride for good quality signals?   Bottom
line..this is poor operating and technical practice.  Just because
it was Field Day, that is no excuse either.  Have the masses digressed
to this level of non technical expertise?  It sure seems so.

Then I was off to 80M and 40M for a few FT-8 contacts. No different.
WOW!  This is all very disappointing.

73
Bob, K4TAX

--
IF ONE EXPECTS COMPUTERS AND TECHNOLOGY TO SOLVE THEIR PROBLEMS,
ONE DOESN'T UNDERSTAND COMPUTERS AND TECHNOLOGY
AND ONE DOESN'T UNDERSTAND THEIR PROBLEMS."
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Re: [Elecraft] [SPAM] K3S - High SWR on 6 Meters

[Bob McGraw K4TAX]

Glad the solution was simple.  And THANKS for posting your results.   I wish 
others would do the same when their issues are resolved. 

73
Bob, K4TAX 

Sent from my iPhone

> On Jun 15, 2022, at 10:25 AM, N4ST - Jim  wrote:
> 
> For some reason, my previous post did not show up.
> 
> *** PROBLEM SOLVED ***
> 
> I had an old LPA/PA combo that was replaced with an upgraded LPA/PA combo.
> The new PA required a configuration setting that inserted 6dB of attenuation 
> in the amplifier chain to avoid instabilities.
> The old combo would not reach full power if the attenuation was inserted, but 
> the new combo was unstable unless it was.
> Keith at Elecraft and also K7HP both suggested the "fix" and that was indeed 
> the problem!
> 
> 
> 73,
> Jim - N4ST
> 
> 
> -Original Message-
> From: elecraft-boun...@mailman.qth.net  On 
> Behalf Of Bob McGraw
> Sent: Tuesday, June 14, 2022 20:56
> To: elecraft@mailman.qth.net
> Subject: [SPAM] [Elecraft] K3S - High SWR on 6 Meters
> 
> Is the ATU in BYPASS or  AUTO mode?  A dit would cause it to resolve a 
> match or recall a previous match.   If your 6M antenna has an SWR of 
> 1.5:1 or less, then the ATU should be in BYPASS mode for 6M.
> 
> With WSJT-X, is the Radio Setup menu set to Fake It or SPLIT? If SPLIT, 
> then is VFO B on some random or frequency distant from VFO A?   I 
> suggest setting the WSJT-X Setup to Fake it.
> 
> 73
> 
> Bob, K4TAX
> 
> 
>> On 6/14/2022 7:46 PM, elecraft-requ...@mailman.qth.net wrote:
>> Message: 6
>> Date: Tue, 14 Jun 2022 09:37:33 -0600
>> From: "N4ST - Jim"
>> To:,
>> Subject: Re: [Elecraft] K3S - High SWR on 6 Meters
>> Message-ID:<02b901d88004$aafe32c0$00fa9840$@n4st.com>
>> Content-Type: text/plain;charset="us-ascii"
>> 
>> High SWR occurs immediately when using the FT8 Tune function on WSJT-X
>> It does not occur initially with a dummy load, however once the high SWR
>> state occurs, it persists when switching to a dummy load.
>> A CW dit will clear the high SWR state..
>> 
>> ___
>> 73,
>> Jim - N4ST
> 
> -- 
> IF ONE EXPECTS COMPUTERS AND TECHNOLOGY TO SOLVE THEIR PROBLEMS,
> ONE DOESN'T UNDERSTAND COMPUTERS AND TECHNOLOGY
> AND ONE DOESN'T UNDERSTAND THEIR PROBLEMS."
> 
> 
> __
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> 
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
> Message delivered to hamsh...@n4st.com 
> 
> 


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[Elecraft] K3S - High SWR on 6 Meters

[Bob McGraw]

Is the ATU in BYPASS or  AUTO mode?  A dit would cause it to resolve a 
match or recall a previous match.   If your 6M antenna has an SWR of 
1.5:1 or less, then the ATU should be in BYPASS mode for 6M.


With WSJT-X, is the Radio Setup menu set to Fake It or SPLIT? If SPLIT, 
then is VFO B on some random or frequency distant from VFO A?   I 
suggest setting the WSJT-X Setup to Fake it.


73

Bob, K4TAX


On 6/14/2022 7:46 PM, elecraft-requ...@mailman.qth.net wrote:

Message: 6
Date: Tue, 14 Jun 2022 09:37:33 -0600
From: "N4ST - Jim"
To:,   
Subject: Re: [Elecraft] K3S - High SWR on 6 Meters
Message-ID:<02b901d88004$aafe32c0$00fa9840$@n4st.com>
Content-Type: text/plain;   charset="us-ascii"

High SWR occurs immediately when using the FT8 Tune function on WSJT-X
It does not occur initially with a dummy load, however once the high SWR
state occurs, it persists when switching to a dummy load.
A CW dit will clear the high SWR state..

___
73,
Jim - N4ST


--
IF ONE EXPECTS COMPUTERS AND TECHNOLOGY TO SOLVE THEIR PROBLEMS,
ONE DOESN'T UNDERSTAND COMPUTERS AND TECHNOLOGY
AND ONE DOESN'T UNDERSTAND THEIR PROBLEMS."


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[Elecraft] KV5J's line of Digital Displays for Elecraft's

[Bob McGraw]

I really think NOT!

On the other hand..the DELETE key works well and as to the JUNK 
filter, it works too.


73

Bob, K4TAX



On 6/8/2022 10:20 AM, elecraft-requ...@mailman.qth.net wrote:

Message: 19
Date: Wed, 8 Jun 2022 10:37:33 +0200
From:"df...@darc.de"  
To:elecraft@mailman.qth.net
Subject: Re: [Elecraft] KV5J's line of Digital Displays for Elecraft's
W2, KXPA100, KPA1500, KAT500 and KPA500 amps
Message-ID:
Content-Type: text/plain;   charset=us-ascii

Should there be advertisings in a mailing list?


--
IF ONE EXPECTS COMPUTERS AND TECHNOLOGY TO SOLVE THEIR PROBLEMS,
ONE DOESN'T UNDERSTAND COMPUTERS AND TECHNOLOGY
AND ONE DOESN'T UNDERSTAND THEIR PROBLEMS."


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[Elecraft] KPA1500 reduces power as it gets warmer?

[Bob McGraw]

Kevin:

The duty cycle on FT-8 mode is ~50%.  The KPA1500 and KPA500 are both 
very adequately rated for this mode and for rated outputs, 1500 watts 
and 500 watts respectively.


Your K2 is rated at 10 watts output!   At 15 watts, just because it will 
do it, is no reason to run that power level.  I can understand why the 
PA failed.   Also SWR will contribute to heating of the PA devices.  
Poor antenna match will eat PA devices.


Hams seem to think running at reduced power will "save something".  This 
is bad ham advice and basically "old ham lore" which is not correct.


Conversely, my measurements show my KPA500 is 38% efficient at 250 watts 
and 57% efficient at 500 watts on 20M.  This relates to 404 watts of 
dissipation at 250 watts and 368 watts of dissipation at 500 watts.   
Thus 500 watts is less strenuous, producing less heat on the components, 
than 250 watts.


Yes, FT-8 is a weak signal mode.  I run near legal limit on 2M to a nice 
array just to have a weak signal off of the moon.   Low power just won't 
get it.


73

Bob, K4TAX

On 6/6/2022 11:29 AM, elecraft-requ...@mailman.qth.net wrote:

From:elecraft-boun...@mailman.qth.neton behalf 
of Kevin Robertson via Elecraft
Sent: Saturday, June 4, 2022 6:52 AM
To: Rick NK7I
Cc:elecraft@mailman.qth.net  
Subject: Re: [Elecraft] KPA1500 reduces power as it gets warmer?

FT8 is a weak signal mode, designed for low power. Given its high duty cycle, 
you are asking for trouble if you operate your power amplifier in FT8 mode 
using your KPA1500 at anywhere near high power. I burned out my final on my K2 
at 15 watts on FT8.

73,
Kevin Robertson KD2WCY


--
IF ONE EXPECTS COMPUTERS AND TECHNOLOGY TO SOLVE THEIR PROBLEMS,
ONE DOESN'T UNDERSTAND COMPUTERS AND TECHNOLOGY
AND ONE DOESN'T UNDERSTAND THEIR PROBLEMS."


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Re: [Elecraft] KPA500/KAT500 SOLD

[Bob McGraw]

KPA500 / KAT500  has been SOLD.

73

Bob, K4TAX

On 5/30/2022 8:52 PM, Bob McGraw wrote:
Making room for something else.   I have for sale my personal KPA500-F 
and KAT500-F.  Includes cables ready to connect to your K3 or K3S.   
Both items have the last release of firmware installed. Both items are 
in excellent condition and include cables and accessories.   Shown on 
my QRZ page.


KPA500-F s/n3519 purchased/received 4/25/2018.  Has original Elecraft 
box and packing.  Includes 240V power cable.


KAT500-F s/n 1807 purchased/received 10/23/2018.

Both have been on my desk in a non-smoking residential environment.  
Pictures are available on request.


Both items shipped to lower 48. $2600.00   Cash or cashier check.

931 256 0340

RMcGraw @ Benlomand dot Net


--
IF ONE EXPECTS COMPUTERS AND TECHNOLOGY TO SOLVE THEIR PROBLEMS,
ONE DOESN'T UNDERSTAND COMPUTERS AND TECHNOLOGY
AND ONE DOESN'T UNDERSTAND THEIR PROBLEMS."


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[Elecraft] KPA500/KAT500 F.S.

[Bob McGraw]

Making room for something else.   I have for sale my personal KPA500-F 
and KAT500-F.  Includes cables ready to connect to your K3 or K3S.   
Both items have the last release of firmware installed.  Both items are 
in excellent condition and include cables and accessories.   Shown on my 
QRZ page.


KPA500-F s/n3519 purchased/received 4/25/2018.  Has original Elecraft 
box and packing.  Includes 240V power cable.


KAT500-F s/n 1807 purchased/received 10/23/2018.

Both have been on my desk in a non-smoking residential environment.  
Pictures are available on request.


Both items shipped to lower 48. $2600.00   Cash or cashier check.

931 256 0340

RMcGraw @ Benlomand dot Net

--
IF ONE EXPECTS COMPUTERS AND TECHNOLOGY TO SOLVE THEIR PROBLEMS,
ONE DOESN'T UNDERSTAND COMPUTERS AND TECHNOLOGY
AND ONE DOESN'T UNDERSTAND THEIR PROBLEMS."


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[Elecraft] [OT ] Specs

[Bob McGraw]

Many many radios are loaded with "whistles and bells".   But the better 
radio is.the one you enjoy using.   If it does everything you 
wish, then look no further.


73

Bob, K4TAX

On 5/25/2022 1:18 PM, elecraft-requ...@mailman.qth.net wrote:

From: Al Lorona
To: Elecraft Reflector
Subject: [Elecraft] [OT] Specs
Message-ID:<1102437476.2890529.1653494380...@mail.yahoo.com>
Content-Type: text/plain; charset=UTF-8

Several weeks ago, someone here recommended listening to a recent interview with receiver 
test guru Rob Sherwood. In it, the interviewer pressed Rob for a radio recommendation. At 
first he resisted but eventually gave three transceivers that he said "anybody would be 
very happy with". But when he compared them, instead of pointing to specs like dynamic 
range, sensitivity, receiver noise, , his deciding factors were interesting.

Speaking about one radio model, he said, "It's a good receiver, but it's got a 
really loud relay inside when you send CW."

About a model from a different manufacturer, he said, "Great radio, but the spectrum 
display makes me dizzy."

About another: "The speech processor doesn't work that well."

And this went on. In other words, just like the rest of us, he believes there are lots of 
other factors that make or break a radio, many more than mere numbers or specs. (At one 
point Rob said, "I think I've created a monster," referring to The List.) This 
is why I have written here in the past that you have to get a radio into your hands 
before deciding whether it's any good; making your decision on the numbers alone doesn't 
give you any real idea how the radio performs.?

Don't write off a new radio just because it's in ninth place (or whatever) on The List. 
Don't be surprised if you don't like one of the "top radios" on The List. Be 
open to liking a radio or manufacturer farther down The List. That's what Rob Sherwood 
does.


R,

Al? W6LX/4


--
IF ONE EXPECTS COMPUTERS AND TECHNOLOGY TO SOLVE THEIR PROBLEMS,
ONE DOESN'T UNDERSTAND COMPUTERS AND TECHNOLOGY
AND ONE DOESN'T UNDERSTAND THEIR PROBLEMS."


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[Elecraft] The Dreaded 400 Hz hump

[Bob McGraw]

Oh yes it is there on many SSB signals where the OP is a male. That is 
where most of the fundamental male voice energy occurs. Those signals 
which look uniform across the SSB TX bandpass do sound good.


I attribute this to the fact most hams will "boost this and boost that" 
and never give thoughts to attenuating.  In fact the characteristics of 
the EQ in the boost mode are noticeable different than the attenuate 
mode.  Yes, one can hear the difference.


In my world of pro audio, it is a practice to attenuate first and then 
boost if absolutely necessary.   Hams just can't get over the fact they 
must always have more...boost boost boost.


So if ones signal is muddy or bassy, what's to do?   Attenuate the low 
end first, and rarely if ever,  boost the high end.  Of course boosting 
the high end will make it brighter, but not attenuating the low end will 
consume lots of unnecessary transmitter power not being used for 
effective communications. 50Hz - 16dB, 100Hz -16dB, 200Hz - 16dB, 400Hz 
- 9dB, 800Hz - 0dB, 1.6kHz - 0dB, 2.4kHz +0dB, 2.4kHz +3dB, 3.2kHz + 6 dB.


Works for me.

73

Bob, K4TAX

On 5/20/2022 4:30 PM, elecraft-requ...@mailman.qth.net wrote:

Message: 8
Date: Thu, 19 May 2022 02:14:10 + (UTC)
From: Al Lorona
To: Elecraft Reflector
Subject: [Elecraft] [OT] The dreaded 400 Hz hump
Message-ID:<1840135010.161126.1652926450...@mail.yahoo.com>
Content-Type: text/plain; charset=UTF-8

Have you studied how SSB signals look on your panadapter? I believe about 90% 
of all phone signals have a very pronounced peak at about 400 or 500 Hz. This 
peak is sometimes 10 dB (or more) higher than the rest of the bandwidth. This 
is wasted power and, to my ear, makes signals sound muddier.

On the other hand, every once in a while you'll see a signal that has a more or 
less flat frequency response, without any huge peaks. Sometimes, a signal will 
actually have slightly*more*  power in the higher frequencies, say, 2000 Hz and 
higher. I've noticed that these signals have much more articulation and punch. 
But these signals are all too scarce.

It's pretty well known that the aging population of hams collectively suffers 
from a high frequency hearing loss. It seems to me that this is even more 
reason to carefully shape your frequency response and cut the dreaded 400 Hz 
hump.

R,

Al? W6LX/4


--
IF ONE EXPECTS COMPUTERS AND TECHNOLOGY TO SOLVE THEIR PROBLEMS,
ONE DOESN'T UNDERSTAND COMPUTERS AND TECHNOLOGY
AND ONE DOESN'T UNDERSTAND THEIR PROBLEMS."


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[Elecraft] Antenna Quandary

[Bob McGraw]

Richard:

Oh yes, there are many knowledgeable folks on the reflector. I'm not one 
of them.  HI  HI


I would ask of you to better define your needs, objective, concerns, 
frequency of usage, and such.  It will enlist a lot better and specific 
answers.


73

Bob, K4TAX


On 5/12/2022 9:42 AM, elecraft-requ...@mailman.qth.net wrote:

Message: 1
Date: Wed, 11 May 2022 16:58:04 -0400
From: Richard
To:elecraft@mailman.qth.net
Subject: [Elecraft] Antenna Quandary
Message-ID:
Content-Type: text/plain;   charset=us-ascii

Anybody out there super-well versed in the behavior of the half-wave dipole?

Cheers,

Richard Kunc
W4KBX


--
IF ONE EXPECTS COMPUTERS AND TECHNOLOGY TO SOLVE THEIR PROBLEMS,
ONE DOESN'T UNDERSTAND COMPUTERS AND TECHNOLOGY
AND ONE DOESN'T UNDERSTAND THEIR PROBLEMS."


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[Elecraft] PayPal holding payment. (Follow up)

[Bob McGraw]

While I do some internet transactions, I'm very careful to research the 
company or person I'm doing business with in advance.  Both ways, when 
buying and when selling.


Regarding internet sales, I figure there are just as many SCAMS as there 
are about that number of SELLERS.   That does not say all SELLERS are 
scams.  But it does say that all SCAMS are sellers. Sell you something 
to get your money, but never get your something, but they get the money.


73

Bob, K4TAX

On 5/8/2022 11:18 AM, elecraft-requ...@mailman.qth.net wrote:

PayPal holding payment. (Follow up)


--
IF ONE EXPECTS COMPUTERS AND TECHNOLOGY TO SOLVE THEIR PROBLEMS,
ONE DOESN'T UNDERSTAND COMPUTERS AND TECHNOLOGY
AND ONE DOESN'T UNDERSTAND THEIR PROBLEMS."


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[Elecraft] K3 Preamp

[Bob McGraw]

I believe the K3 has one preamp while the K3S has two.    The synth 
boards have nothing to do with the preamp.


73

Bob, K4TAX

On 5/8/2022 11:18 AM, elecraft-requ...@mailman.qth.net wrote:

Message: 11
Date: Sat, 7 May 2022 15:40:07 -0600
From: Mike Fatchett W0MU
To:elecraft@mailman.qth.net
Subject: [Elecraft] K3 Preamp
Message-ID:
Content-Type: text/plain; charset=UTF-8; format=flowed

I thought there were two settings for the preamp? Like a 1 and 2? I have
the new synth boards.

W0MU


--
IF ONE EXPECTS COMPUTERS AND TECHNOLOGY TO SOLVE THEIR PROBLEMS,
ONE DOESN'T UNDERSTAND COMPUTERS AND TECHNOLOGY
AND ONE DOESN'T UNDERSTAND THEIR PROBLEMS."


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[Elecraft] I need some guidance - KAT500

[Bob McGraw]

Your request can be attained by use of the KAT500 Utility to configure 
each antenna or antenna port per band as needed.


I use Ant 1 and Ant 2 for my wire antennas, 160M - 10M and Ant 3 for my 
6M yagi in bypass mode.  After setting up the KAT500 via the Utility, 
and training the KAT500 for the antennas and frequencies, then when I go 
to 6M the KAT500 goes automatically to BYPASS mode.    The other bands 
are selected for "last used" by the Utility.


73

Bob, K4TAX

On 5/5/2022 1:49 PM, elecraft-requ...@mailman.qth.net wrote:

Message: 21
Date: Thu, 5 May 2022 07:45:40 -0700
From: "Mike Flowers"
To:,
Subject: [Elecraft] I need some guidance - KAT500
Message-ID:<004301d8608e$cafe8510$60fb8f30$@gmail.com>
Content-Type: text/plain;   charset="us-ascii"

Hello Elecrafters,

  


I am running a K3-based K-Line: K3-P3-KAT500-KPS500.

  


Currently, I have two antennas connected to my KAT500: ANT 1 is my SteppIR
40/30 3L, and ANT 3 is my 160M/80M dipole.

  


When I have my K3 select 40M/20M/17M/15M/12M/10M/6M, my KAT500 is in BYP
mode and ANT 1 as expected.

  


On 30M, my SteppIR requires some matching and I have trained the KAT500 to
match the SteppIR on 30M.  This works fine if I remember to switch the
KAT500 to MAN before transmitting on 30M.

  


On 160M and 80M, the KAT500 selects the ANT 3 correctly, but stays in BYP
mode and I must switch the KAT500 to MAN to use the KAT500 matching
parameters.

  


I've been operating this way for 10 years and I'm quite use to these
methods.

  


However, it has occurred to me that there may be a way of configuring the
KAT500 so that:

  


*   When I have the K3 select 30M, the KAT500 selects MAN mode ANT 1,
and then if 40M/20M/17M/15M/12M/10M/6M is selected, the KAT500 would return
to BYP mode on ANT1.

  


*   When I have the K3 select 160m or 80M, the KAT500 would select MAN
mode ANT 3, and then if 40M/20M/17M/15M/12M/10M/6M is selected, the KAT500
would return to BYP mode ANT1.

  


It appears to me that once my KAT500 is in BYP mode, it remains in BYP mode
for whichever band/ANT is selected until changed by the MODE button, and
once in MAN mode, it remains in that mode until manually changed.

  


I've worked with the KAT500 Utility to try to achieve this more automatic
switching of antennas and KAT500 modes by band but have not yet succeeded.
I've read through the manual, but I cannot find what I need to accomplish
this.

  


Your guidance would be most appreciated.  Thanks!

  


- 73 and good DX de Mike,  K6MKF, NCDXC
   Vice-President 2021-2022 - In pursuit of
DXCELLENCE!

  

  




--
IF ONE EXPECTS COMPUTERS AND TECHNOLOGY TO SOLVE THEIR PROBLEMS,
ONE DOESN'T UNDERSTAND COMPUTERS AND TECHNOLOGY
AND ONE DOESN'T UNDERSTAND THEIR PROBLEMS."


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[Elecraft] K4D - KPA500 Fault Question + wish

[Bob McGraw]

Based on my experience with my KPA500 and an exchange with Jack, W6FB, I 
have found no need to run the Fan Speed at any value other than NOR as 
defined via the MENU.   {See my comments regarding efficiency.}


I'm aware that "others" have measured and tracked and computed results 
to an extensive numerical value.  OK so be it.  It is your amp.  I just 
choose to run mine in the "quiet" mode of NORMAL {and not suck in a load 
of dust by it running all the time} and allow the control system in the 
amp to apply the fan and fan speed as so dictated by the software.


73

Bob, K4TAX


On 4/24/2022 6:48 PM, elecraft-requ...@mailman.qth.net wrote:

Message: 15
Date: Sun, 24 Apr 2022 15:40:30 -0500
From: Jack Brindle
To: email
Cc:"elecraft@mailman.qth.net"  
Subject: Re: [Elecraft] K4D - KPA500 Fault Question + wish
Message-ID:
Content-Type: text/plain;   charset=utf-8

If there was no recent ?HI TEMP? fault in the log, then it was not the KPA500 
that caused the display on the K4.
In that case, ask the K4 folks what may have happened.

I have never seen a HI TEMP fault with my KPA500s in normal operation, although 
I am sure others have.
I have seen it when testing?

Again, the FAN CTL is the minimum fan speed. If the fan goes above that speed, 
it will certainly slow down when
the PA cools. The amp works just fine at the default value of 0, only turning 
on the fan when it is needed.

Now, my question for everyone reading - when is it that you feel the need to 
set the fan speed above 0?

73,
Jack, W6FB


--
IF ONE EXPECTS COMPUTERS AND TECHNOLOGY TO SOLVE THEIR PROBLEMS,
ONE DOESN'T UNDERSTAND COMPUTERS AND TECHNOLOGY
AND ONE DOESN'T UNDERSTAND THEIR PROBLEMS."


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[Elecraft] KPA500 Fault Question + wish

[Bob McGraw]

A year or so ago I embarked on a project to determine the efficiency and 
the "sweet spot" operating parameters of my KPA500.   I drive my KPA500 
with my Elecraft K3S.


Armed with a good 50 ohm dummy load, two watt meters {one on the input 
and one on the output}, and my EXCEL spreadsheet, I measured each band, 
160M - 6M.  I choose power output levels starting at 100 watts and every 
100 watts thereafter up to 500 watts.    Using the KPA500 display as the 
source for volts and amps, the input power was determined and calculated 
against the measured output power.  Thus the efficiency was easily 
calculated.   No consideration for the actual drive power was in the 
measured output power.


And at the same time, measuring the input power and output power and a 
little math, the gain of the amplifier was determined at various power 
levels and bands.


Yes indeed, I found that running at reduced power saves nothing! The amp 
is more efficient in the 350 to 450 watt range and thus dissipates less 
heat.  And from band to band and power level,  it is easy to see that 
the efficiency changes.


In a quick summary, I found the efficiency runs from a low of 23.4% at 
100 watts on 20M to a high of 70.9% at 500 watts on 80M.   I did not 
exceed 500 watts on any band,  thus any amplifier compression was not 
anticipated.   The power/heat dissipation runs from a high of 400 watts 
at 250 watts output on 20M to a low of 196 watts at 100 watts output on 
80M.  The amplifier average gain varies from 13.95 dB on 20M to 14.59 dB 
on 80M.   To attain these values, the drive power varies from a low of 
3.3 watts on 10M & 15M for 100 watts output to a high of 18.5 watts for 
500 watts on 40M.


It might do well for each KPA500 owner to run power and efficiency 
curves on their amplifiers.   The results are enlightening.


73

Bob, K4TAX


On 4/24/2022 6:48 PM, elecraft-requ...@mailman.qth.net wrote:

Message: 12
Date: Sun, 24 Apr 2022 14:03:55 -0400
From: EMAIL
To: Elecraft K4 Group,
"elecraft@mailman.qth.net"  
Subject: [Elecraft] K4D - KPA500 Fault Question + wish
Message-ID:
Content-Type: text/plain; charset=UTF-8; format=flowed

Yesterday I got a fault message on the K4 screen. It disappeared before
I could see it fully, but I did get "tighten heatsink screws".? The fan
was working as its speed was speeding up and the KPA500 temp saw about
60+C (it may have been higher).? I was running 100 watts PSK31.? The
KPA500 did switch to STBY (I think).

I can not find any record of what the message was.? I can not find
"heatsink screws" referenced in the K4, KPA500 or KPA1500 manuals.? Both
the K4 and KPA500 are factory built.

PSK31 has a longer duty cycle than FT8 and I was running FT8 at higher
power with out the amp temp going above 60C, earlier.? I switched to
barefoot and ran 80W PSK31 without issue.

Question 1) Before I take the KPA500 apart, is this a problem or just
duty cycle?? I would think the KPA500 would be able to handle 100W key
down.

Question 2) I saved the K4 backup and diagnostic logs to USB disk (the
next day).? I could NOT find anything that looked like the error
messages.? I find many messages disappear before I get a chance to read
them.

Wish 1) KPA500 add FAN CTL for both OPER and STBY or set STBY to run at
NOR and OPER to be adjustable.

Wish 2) K4, allow checking date/time for all past error messages.? I may
have had a KPA500 over temp message while long winded on SSB (but only
200W)?

Wish 3) K4, HOLD error messages until "confirmed".? Messages like KPA500
on/off (info) only need to be short time (??), but if away (maybe
confirm).? Either way "this" will be an issue for? the contesters, so
have a way to save for later recall, as in write to USB if one is
installed.? Fn could write to USB disk with time stamp?? OR, are there
documents on how to read the diagnostic logs?


73, steve WB3LGC

I will also send to support if no one has a good idea about the fault.



--
IF ONE EXPECTS COMPUTERS AND TECHNOLOGY TO SOLVE THEIR PROBLEMS,
ONE DOESN'T UNDERSTAND COMPUTERS AND TECHNOLOGY
AND ONE DOESN'T UNDERSTAND THEIR PROBLEMS."


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[Elecraft] Various non-ham signals

[Bob McGraw]

The following link provides some very interesting data regarding many 
new and current signals heard on or near the ham bands.


https://www.sigidwiki.com/wiki/Category:Military

73

Bob, K4TAX

--
IF ONE EXPECTS COMPUTERS AND TECHNOLOGY TO SOLVE THEIR PROBLEMS,
ONE DOESN'T UNDERSTAND COMPUTERS AND TECHNOLOGY
AND ONE DOESN'T UNDERSTAND THEIR PROBLEMS."


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[Elecraft] military-intruders-in-ham-radio-bands

[Bob McGraw]

Interesting reading.  Also the links are equally interesting.

http://www.southgatearc.org/news/2022/april/iarums-newsletter-military-intruders-in-ham-radio-bands.htm

73

Bob, K4TAX

--
IF ONE EXPECTS COMPUTERS AND TECHNOLOGY TO SOLVE THEIR PROBLEMS,
ONE DOESN'T UNDERSTAND COMPUTERS AND TECHNOLOGY
AND ONE DOESN'T UNDERSTAND THEIR PROBLEMS."
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[Elecraft] Rig control error with K3S and WSJT-X on 30 meters

[Bob McGraw]

Only one band?   Sounds like the classic RFI into the computer, the 
cables between the radio and computer.  Most likely common mode current 
on the feedline coming back down into the station area.   That would 
require common mode choke to be installed at the feed point of the 
antenna.  Might try a couple of turns of coax through a FT core and see 
if that helps.   A couple of clamp on beads on the cable between the 
radio and computer might help. But the antenna feed point is really the 
best place to censure common mode current.


Also..make sure every piece of station equipment is bonded to a 
common point.   I use the station power supply ground terminal for my 
common point.  Each piece of equipment has a dedicated jumper to this 
point.


73

Bob, K4TAX

On 4/21/2022 7:50 AM, elecraft-requ...@mailman.qth.net wrote:

Message: 13
Date: Mon, 18 Apr 2022 22:20:38 -0700
From: Frank O'Donnell
To:"elecraft@mailman.qth.net"  
Subject: [Elecraft] Rig control error with K3S and WSJT-X on 30 meters
Message-ID:<792c3760-8000-ef9b-93d1-30dafa060...@inkbox.net>
Content-Type: text/plain; charset=UTF-8; format=flowed

Over a period of time I've noticed an occasional error when transmitting
FT8 on 30 meters with my K3S using WSJT-X. A couple of seconds into a
transmit cycle, WSJT-X will display a "Rig control error" box, and I
start hearing the rig's modulated audio output on its own speaker. This
only happens on 30 meters, and not 100% of the time. Over the past day,
I've done FT8 QSOs normally on various bands, but when I tried 30 meters
tonight I experienced the above error several times in a row. It's
occurred over time using various versions of WSJT-X. The computer is a
Mac running Catalina.

I tried going into WSJT-X preferences and changing Radio > Split
Operation from "Rig" to "Fake It," but the error persisted.

I can try changing around various parts of the setup (using a Windows
PC, for example), but first was curious if anyone has seen a
band-specific error like this.

Thanks,

Frank K6FOD


--
IF ONE EXPECTS COMPUTERS AND TECHNOLOGY TO SOLVE THEIR PROBLEMS,
ONE DOESN'T UNDERSTAND COMPUTERS AND TECHNOLOGY
AND ONE DOESN'T UNDERSTAND THEIR PROBLEMS."


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[Elecraft] KPA500 Issue

[Bob McGraw]

Are you seeing and * on the KPA500 screen when using the IC-705 and the 
amp is in Operate mode?   If so, the amp is being keyed while the IC-705 
is in receive mode.  Confirmed by the fact when the amp is in STBY that 
signals are normal.


Check your amp keying interface and cable wiring.  You should be able to 
prove and Amp Key command from the IC-705 to the KPA500. Thus when the 
IC-705 is keyed, likewise the amp.


73

Bob, K4TAX




On 3/31/2022 6:35 PM, elecraft-requ...@mailman.qth.net wrote:

Message: 17
Date: Thu, 31 Mar 2022 11:52:29 -0600
From: James Bennett
To: Elecraft Reflector Reflector
Subject: [Elecraft] KPA500 Issue
Message-ID:
Content-Type: text/plain;   charset=utf-8

Having an issue with my KPA500 and a non-elecraft radio. I?ve got an Icom 
IC-705 connected to my KPA500 and KAT500. By dropping the 705?s output power to 
4 watts and pressing Tune on the KAT500 with the amp in OPER mode, I?m able to 
get the tuner to give me a good match on just about all bands to my Zerofive 
Flagpole Vertical. Then, turning the power level up to max (10 watts) on the 
IC-705, the amp gives me anywhere from 210 to 250 watts output, depending on 
the band. And that?s fine for me right now.

However, what I?m seeing is that when the amp is in OPER mode, my receive 
signal strength drops way, way off to the point I have to go full AF volume to 
hear signals. If I put the amp in STBY, signal levels go back to normal. I also 
notice that the amp fan doesn?t take too long to crank up to high speed, and 
the PA temp is sitting around 67 C.

I also have a K3. When I power up the K3 and switch the antenna over to the K3 
on the same band as the IC-705 - there is no drop in signal level on it when 
switching between OPER and STBY on the amp. And, yes, when I?m using the 
IC-705, I press the corresponding BAND button on the amp.

OK - some further info: if I have the K3 sitting on the same band as the IC-705 
this does not happen - going from STBY to OPER on the amp makes no difference 
on receive level on the IC-705. But if I power off the K3, the IC-705 reverts 
to its partially-deaf state.

Somewhere long ago in a far distant galaxy, I recall Jack W6FB mentioning that 
the K3 pulls some signal to zero when it is powered off. I suspect that may be 
what is happening here but for the life of me I can?t recall the exact 
conversation. I?d like to get to the point where I can run the IC-705 with this 
tuner and amp without having the K3 in the equation, as the K3 will be going on 
the sale block in the near future, in anticipation of a K4D delivery.

Any ideas?  Jack - are you listening?:-)

Jim / K7TXA


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[Elecraft] KPA500 Issue

[Bob McGraw]

Are you seeing and * on the KPA500 screen when using the IC-705 and the 
amp is in Operate mode?   If so, the amp is being keyed while the IC-705 
is in receive mode.  Confirmed by the fact when the amp is in STBY that 
signals are normal.


Check your amp keying interface and cable wiring.  You should be able to 
prove and Amp Key command from the IC-705 to the KPA500. Thus when the 
IC-705 is keyed, likewise the amp.


73

Bob, K4TAX




On 3/31/2022 6:35 PM, elecraft-requ...@mailman.qth.net wrote:

Message: 17
Date: Thu, 31 Mar 2022 11:52:29 -0600
From: James Bennett
To: Elecraft Reflector Reflector
Subject: [Elecraft] KPA500 Issue
Message-ID:
Content-Type: text/plain;   charset=utf-8

Having an issue with my KPA500 and a non-elecraft radio. I?ve got an Icom 
IC-705 connected to my KPA500 and KAT500. By dropping the 705?s output power to 
4 watts and pressing Tune on the KAT500 with the amp in OPER mode, I?m able to 
get the tuner to give me a good match on just about all bands to my Zerofive 
Flagpole Vertical. Then, turning the power level up to max (10 watts) on the 
IC-705, the amp gives me anywhere from 210 to 250 watts output, depending on 
the band. And that?s fine for me right now.

However, what I?m seeing is that when the amp is in OPER mode, my receive 
signal strength drops way, way off to the point I have to go full AF volume to 
hear signals. If I put the amp in STBY, signal levels go back to normal. I also 
notice that the amp fan doesn?t take too long to crank up to high speed, and 
the PA temp is sitting around 67 C.

I also have a K3. When I power up the K3 and switch the antenna over to the K3 
on the same band as the IC-705 - there is no drop in signal level on it when 
switching between OPER and STBY on the amp. And, yes, when I?m using the 
IC-705, I press the corresponding BAND button on the amp.

OK - some further info: if I have the K3 sitting on the same band as the IC-705 
this does not happen - going from STBY to OPER on the amp makes no difference 
on receive level on the IC-705. But if I power off the K3, the IC-705 reverts 
to its partially-deaf state.

Somewhere long ago in a far distant galaxy, I recall Jack W6FB mentioning that 
the K3 pulls some signal to zero when it is powered off. I suspect that may be 
what is happening here but for the life of me I can?t recall the exact 
conversation. I?d like to get to the point where I can run the IC-705 with this 
tuner and amp without having the K3 in the equation, as the K3 will be going on 
the sale block in the near future, in anticipation of a K4D delivery.

Any ideas?  Jack - are you listening?:-)

Jim / K7TXA


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[Elecraft] TCXO

[Bob McGraw]

The TCXO is the reference frequency for about everything that takes 
place in the radio.  It is the master clock.  If it is incorrect, then 
everything else is incorrect, for the most part.


A 5 ppm TCXO, or 5 parts per million, can have an error of +/-250 Hz on 
6 meters.   Where as a 0.5 ppm TCXO can have an error of 25 Hz on 6 
meters.   It just depends on how accurate and stable you desire your 
radio to be.


Oh, the frequency read-out on the front is just that, a read out.  It is 
not a frequency measurement of the exact frequency. Many will put their 
radio on 14.255.000 and swear it is on that frequency.  But with a 5 ppm 
TCXO it could be +/- 71 Hz.  Where as with a 0.5 ppm it would be +/- 7 
Hz.  Of course one must consider crystal and component ageing and 
perform very easy calibration procedure at regular intervals.  I check 
and adjust mine once a month and can maintain +/- 2 Hz or or better.


I ordered mine with the 1 ppm TCXO with F/W corrected to 0.5 ppm.

73

Bob, K4TAX


On 3/30/2022 3:25 PM, elecraft-requ...@mailman.qth.net wrote:

Message: 1
Date: Wed, 30 Mar 2022 07:44:49 -0500
From: rikoski
To:elecraft@mailman.qth.net
Cc: Richard Rikoski
Subject: [Elecraft] TCXO
Message-ID:<11ce6286-6d21-47fd-9734-4b1646d35...@rikoski.com>
Content-Type: text/plain;   charset=us-ascii

What are the uses for the TCXO option in a K3?

Why would I want one? Thanks,

73 W9ZD


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[Elecraft] Knowles HC-3 Mic Element Replacement For Heil, HC-5

[Bob McGraw]

Why not get a mike that DOES perform correctly and one that sounds good 
as well?  And why not learn proper mike technique while at it?   There 
are a multitude of good mikes on the market that really sound good and 
many cost less than $25.


Reminds me of the incident when I was assisting a fellow ham with his 
audio. We tried about everything to no avail.   I suggested if he had a 
different mike that he should try it.  He did, and it sounded great.  I 
told him that it sounded great and his response was; "well, I don't like 
the way it looks"..  Uh, this is radio, not TV.  I can't see it but 
I can sure hear his lousy sounding good looking mike.


Mikes, like about everything else, are designed for a function and 
purpose.  If it doesn't fit your needs as function and/or purpose, then 
you've selected the wrong item for the application. Thus not the fault 
of the item.


73

Bob, K4TAX


On 3/23/2022 2:14 PM, elecraft-requ...@mailman.qth.net wrote:

Message: 1
Date: Mon, 21 Mar 2022 15:15:02 -0700
From: Fred Jensen
To:elecraft@mailman.qth.net
Subject: Re: [Elecraft] Knowles HC-3 Mic Element Replacement For Heil
HC-5
Message-ID:<1c983dc7-13f5-b532-908f-6c9196ed0...@gmail.com>
Content-Type: text/plain; charset=utf-8; format=flowed

"It would be great if these elements could be modified to perform better"

Au contraire, Tony.? They were designed for a particular purpose and
they perform very well for that purpose.? Unfortunately, that purpose is
just not normally found in ham radio.

It is very hard to beat electret mics.? They're cheap, tiny, have flat
responses, and tend to be immune to breath-blasts if you talk across
them rather than into them. Some mics [dynamic and especially ribbon
velocity mics] will emphasize the lows as you move close to them.? The
classic RCA 44-BX series [fairly large, prismatic-shaped one, Johnny
Carson used to have one on his desk] was particularly afflicted ... when
I was 17 and on AM, I sounded like I was 17.? Crawl up very close to the
-BX and I sounded like Morgan Freeman playing God in "Bruce Almighty."?
There is little speech information in the low frequencies but a lot of
power.? Electrets are generally less prone to this.? Most of today's
rigs provide the DC bias electrets require right on the mic connector.


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[Elecraft] KPA 500

[Bob McGraw]

With the  band switching cable between the radio and amp, the amp 
follows the receiver frequency/band.  Thus it is not necessary key the 
radio or to transmit anything.  The bands are loaded with miscellaneous 
garbage today.  Why add any more?


My K3S connects to my KAT500 which connects to my KPA500.   Sure is a 
sweet and reliable system.  Hard to screw up anything.


73

Bob, K4TAX


On 3/23/2022 2:14 PM, elecraft-requ...@mailman.qth.net wrote:

Message: 6
Date: Tue, 22 Mar 2022 10:24:59 +0100
From: F5vjc
To: Elecraft Reflector
Subject: [Elecraft] KPA 500
Message-ID:

Content-Type: text/plain; charset="UTF-8"

What is the advantage of using a band switching cable between the
transceiver and the KPA500 over just relying on the RF sensing function?

I want to drive my KPA500 from an FTDX 101D, is a cable the better way to
go?

73 F5VJC


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[Elecraft] K4 Vs. Flex 6400

[Bob McGraw]

Before I posted my numbers, I did print the current Sherwood table.  I 
then went across each line for the FT-DX101D, the K3S, and the FLEX 
6700.  I did compare 6 of the 10 or so data lines. My reason for doing 
this has to do with someone that posted "the FT=101D has the best 
receiver performance numbers".  Well this is not exactly true.  The K3S 
is consistently better than the FT-DX101D and the FLEX 6700.  As to the 
K4D, it is much further down the list from the top 3 or 4.


I fear many hams only look at the top line, brand and model and say that 
is best.   Clearly this is not true.  The top line is sorted by Dynamic 
Range Narrow spaced and that's all.    Certainly there are factors just 
as important or more important data points than that.


Of course there is no way to judge whistles and bells.  I think more 
hams are enticed by whistles and  bells and know little what makes for a 
performance radio.   Secondly, factors as quality of the product, 
failures out of the box, service turn-a-round time, long term support, 
and etc.  all come into play in identifying a good radio.  To me that 
puts Elecraft at the top of the list, all facts considered.


73

Bob, K4TAX




Actually, the Yaesu FTDX101D/MP has the best receiver numbers on
Sherwood's list. That doesn't mean that it's the best radio for you,
but the Flex and the K4 aren't "far and away" better receivers than
anything else in the amateur market. Ironically, Rob seems to really
like Icoms...


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[Elecraft] Elecraft K4 Vs. Flex 6400

[Bob McGraw]

As I read the numbers the FT-DX101D is not necessarily the top radio.   
Here's why:


Noise Floor     FT-DX101D -127 dBm Elecraft K3S  -135 
dBm  FLEX 6700  -118 dBm


AGC Threshold   FT-DX101D 4.5 uV         Elecraft K3S  1.5 uV   
       FLEX 6700 4.2 uV


100kHz Blocking--- FT-DX101D 147 dB        Elecraft K3S  150 dB     
 FLEX 6700  130 dB


Sensitivity      FT-DX101D .60 uV Elecraft K3S .27 
uV          FLEX 6700  2.0 uV


LO Noise -     FT-DX101D 154 dBc   Elecraft K3S  144 
dBc   FLEX 6700  145 dBc


Dynamic Range wide spaced ---   FT-DX1010D  110 dB     Elecraft K3S    
107 dB    FLEX   99 dB


So you see, one needs to look at ALL the numbers, not just the ranking, 
based on Dynamic Range narrow spaced.


All numbers from Sherwood Engineering 3/7/2022 Receiver test data.

73

Bob, K4TAX



On 3/7/2022 2:18 PM, elecraft-requ...@mailman.qth.net wrote:

Message: 2
Date: Sat, 5 Mar 2022 21:42:35 -0600
From: Kurt Pawlikowski
To:"elecraft@mailman.qth.net"  
Subject: Re: [Elecraft] Elecraft K4 Vs. Flex 6400
Message-ID:<6eeff195-f4ba-5836-39b5-07baecf1c...@pinrod.com>
Content-Type: text/plain; charset=UTF-8; format=flowed

Scott,

  ??? Well, yes: The "numbers" say one thing (or several things!), but,
like I said, I'm in love with Elecraft... So, yes, I'm prejudiced! Of
course the "top radio (FT-DX101D)" is somewhat more expensive then the
6400, and does seem to have some nice whistles and bells. Who knows?
Maybe I'll do a switch to Yaesu... {'-)

  ??? k WB9FMC

On 3/5/22 18:46, Scott Manthe wrote:

Actually, the Yaesu FTDX101D/MP has the best receiver numbers on
Sherwood's list. That doesn't mean that it's the best radio for you,
but the Flex and the K4 aren't "far and away" better receivers than
anything else in the amateur market. Ironically, Rob seems to really
like Icoms...

73,
Scott N9AA

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[Elecraft] D-104 Mic Element Replacement

[Bob McGraw]

Most D-104 mikes are not suited for use with today's radios.  The 
original D-104 was designed to work into a load impedance of 4 meg-ohms 
or higher.  Today's radios microphone input is about 50k ohms or so.   
The result is then excessive load on the D-104 element.  This is the 
major cause of frequency response issues.


The D-104 with the TG stand {amplified mike stand} uses the FET device 
as a buffer, thus it is providing a very high impedance for the mike 
element and adequate gain to drive a 50k ohm or lower microphone input.


As to replacing the D-104 element, if yours has output, likely it is OK 
and is suffering from the issue of improper load on the element.  
Remember, this mike was designed to operate with tube type microphone 
amplifiers, having an input impedance of several meg-ohms.


The D-104 on my TUG8 stand has the original Rochelle salt element and 
the FET amplifier in the base.  It sounds great on any of my radios.  My 
comment is that one should use the mike such that moisture or spittal 
from the mouth does not accumulate on the mike face and element.  Also 
don't leave it in a position where the equipment will heat the D-104 
above room temperature and surely left in the direct sun.


I frequently hear hams talking about using a D-104 with a Heil 
element.   Fact is, it no longer is a D-104, it is a Heil HC-4 or HC-5 
or whatever.


73

Bob, K4TAX


On 2/23/2022 1:57 PM, elecraft-requ...@mailman.qth.net wrote:

Message: 2
Date: Tue, 22 Feb 2022 17:35:58 -0500
From: Dean Adinolfi
To:elecraft@mailman.qth.net
Subject: Re: [Elecraft] D-104 Mic Element Replacement
Message-ID:

Content-Type: text/plain; charset="UTF-8"

W2ENY element works great.

https://www.w2eny.com/

Dean, KD3ANX


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[Elecraft] Apology

[Bob McGraw]

To all:

I messed up big time!   I failed to edit the digest to just the message 
to which I was responding and failed to change the Subject.


While I saw my goof last evening, I'm embarrassed.

73

Bob, K4TAX

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Re: [Elecraft] Elecraft Digest, Vol 214, Issue 6

[Bob McGraw K4TAX]

Bob

Sent from my iPhone

> On Feb 16, 2022, at 10:33 AM, elecraft-requ...@mailman.qth.net wrote:
> 
> Send Elecraft mailing list submissions to
>elecraft@mailman.qth.net
> 
> To subscribe or unsubscribe via the World Wide Web, visit
>http://mailman.qth.net/mailman/listinfo/elecraft
> or, via email, send a message with subject or body 'help' to
>elecraft-requ...@mailman.qth.net
> 
> You can reach the person managing the list at
>elecraft-ow...@mailman.qth.net
> 
> When replying, please edit your Subject line so it is more specific
> than "Re: Contents of Elecraft digest..."
> 
> 
> Today's Topics:
> 
>   1. Re: When is a Key Out not a Key Out (Julia Tuttle)
>   2. Re: Key In - Key Out (W3AB/GEO)
>   3. K3 strange overshoot (Bob McGraw)
>   4. Re: K3 strange overshoot (Jim Brown)
>   5. Re: Lots of Elecraft seen in contest video (Josh Fiden)
>   6. K4D delivery time (Chuck Chandler)
>   7. Re: K4D delivery time (Jim Rhodes)
>   8. Re: K4D delivery time (Jim Brown)
>   9. Elecraft One-Time Deals -- special prices & limited
>  quantities (Wayne Burdick)
>  10. Re: K4 Pricing (K5WA)
>  11. Re: K4 Pricing (Magnus Danielson)
>  12. Re: K4 Pricing (Brian Maynard)
>  13. Elecraft CW Net Announcement (kevin)
>  14. Sunday 40 Meter SSB net 7280, 1900Z (Steve Hall)
>  15. Re: K4 Pricing (Bill Johnson)
>  16. Elecraft CW Net Report (kevin)
>  17. K3 BG COMMAND (K4PI.Mike Greenway)
>  18. K3 with PX3 Panadapter (Ed G)
>  19. Re: K3 with PX3 Panadapter (Mark Goldberg)
>  20. End of 3G will not affect your Amateur Radio service
>  (Wayne Burdick)
>  21. Re: End of 3G will not affect your Amateur Radio service
>  (Gwen Patton)
>  22. Re: End of 3G will not affect your Amateur Radio service
>  (Gwen Patton)
>  23. Re: End of 3G will not affect your Amateur Radio service
>  (Ingo Meyer DK3RED)
>  24. Re: End of 3G will not affect your Amateur Radio service
>  (j...@kk9a.com)
> 
> 
> --
> 
> Message: 1
> Date: Fri, 11 Feb 2022 16:08:49 -0500
> From: Julia Tuttle 
> To: Pete Smith N4ZR 
> Cc: Elecraft List 
> Subject: Re: [Elecraft] When is a Key Out not a Key Out
> Message-ID:
>
> Content-Type: text/plain; charset="UTF-8"
> 
> It was technically an attack on your reason for disliking "KEY OUT", not
> you! I try to be careful to attack ideas, not people.
> 
>> On Fri, Feb 11, 2022 at 4:06 PM Pete Smith N4ZR  wrote:
>> 
>> Well, at least I managed to precipitate something all too rare on the
>> Internet these days, unanimity.  And only one of the responses went
>> beyond disagreeing, to attack me personally - that's progress of a sort.
>> 
>> 73, Pete N4ZR
>> Check out the new Reverse Beacon Network
>> web server at <http://beta.reversebeacon.net>.
>> For spots, please use your favorite
>> "retail" DX cluster.
>> 
>>> On 2/11/2022 1:23 PM, Nate Bargmann wrote:
>>> So, "keying the mic" or "keying up a repeater" is not proper
>>> terminology?  I've long heard the phrase of "the radio keys the
>>> amplifier", etc.
>>> 
>>> I need to go back to Novice class I guess...
>>> 
>>> 73, Nate, N0NB
>>> 
>> __
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>> Please help support this email list: http://www.qsl.net/donate.html
>> Message delivered to ju...@juliatuttle.net
> 
> 
> --
> 
> Message: 2
> Date: Fri, 11 Feb 2022 15:37:38 -0600
> From: W3AB/GEO 
> To: elecraft@mailman.qth.net
> Subject: Re: [Elecraft] Key In - Key Out
> Message-ID: <907b114cafae7faf12cbe8d1d37d0...@w3ab.org>
> Content-Type: text/plain; charset=US-ASCII; format=flowed
> 
> A very easy solution is at hand in most of our tool boxes, a label 
> maker.
> 
> Don't like the label you see, customize it. hihi
> 
> ---
> 73 de W3AB/GEO
> AFA9GB
> 
> WA2LSI, KE6RJW, W7B, AAR9AG
> 
> 
> --
> 
> Message: 3
> Date: Fri, 11 Feb 2022 16:06:39 -0600
> From: Bob McGraw 
> To: elecraft@mailman.qth.net
> Subject: [Elecraft] K3 strange overshoot
> Message-ID: <2ed546bc-0166-8855-c92c-def44aa0e...@benlomand.net>
> Content-Type: text/plain; charset=UTF-8; format=flowed
> 
> Although my configuration

[Elecraft] K3 strange overshoot

[Bob McGraw]

Although my configuration is a bit different,  K3S, P3, KPA500, and 
KAT500, I see a small initial overshoot when changing bands. Drive power 
for each band is different.  PWR SET is Per Band.  TUN PWR is set for 20 
watts.   I have the amp configured to switch to STBY when changing 
bands.  I manually put it into OPER after a band change. I attribute 
the issue to be the ALC and power control system in the radio getting 
its act together.  K3S firmware version is   uC 05.67.


Operationally, when changing bands, I hit TUNE to make sure all is well 
with the switching and tuning.  Then place the amp in OPER as the band 
change puts it in STBY.  This seems to negate the issue.


73

Bob, K4TAX


On 2/11/2022 3:06 PM, elecraft-requ...@mailman.qth.net wrote:

Message: 8
Date: Fri, 11 Feb 2022 16:43:21 +0100
From: "Petr Ourednik"
To:Elecraft@mailman.qth.net
Subject: [Elecraft] K3 strange overshoot
Message-ID:<0954bd6f-61f5-4218-a22f-3b016b3ba...@www.fastmail.com>
Content-Type: text/plain;charset=utf-8

Hi folks,

so sorry to bother you over here.
I realized strange behavior of my trusty K3 (#778 fully upgraded, loaded, 
latest synths installed)
When I tried to exciting KPA500 amp I suffered with strange overshoots during 
first dots.

Symptoms:
- up to 12W from K3 all is ok, over 13W the full scale deflection on KPA500 
appears on first dots
- after 1-2 dots power drops back to expected power based on exciting power 
level
- the overshoot appears again after band changing or switching between OPER/STBY
- 160m-30m are heavily affected, 20m-10m behaves better and it can be driven up 
to 18W but overshoot appears too (just slightly to about 600W on LED scale)

Conditions:
I realized that behavior into antennas with SWR all below 1:1.4 > no SWR 
protection activated at all.
The same issue appears into dummy load.

I will be happy for any kind of ideas or hints where to start...:(
Many thanks in advance.

73 - Petr, OK1RP
"Apple & Elecraft freak"
B:http://ok1rp.blogspot.com
--
What could be easier..?  _?(???)?_?/??


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Re: [Elecraft] KPA1500 wattmeter adjustment

[Bob McGraw]

Power measurements can be accomplished in other ways.  One is to use an 
RF Amp meter and a known value load.   Broadcast stations have done it 
this way for years.  Hence, 4.4 amps into 50 ohms is 1000 watts.  
Another way is to use the voltage across a value of R and calculate 
power.   Thus 223.6 volts across 50 ohms is 1000 watts.  And finally if 
the voltage and current is known, then E x I = P.   The LP-100 series, 
as I understand, uses two methods, one measuring current and one 
measuring voltage and calculates power. The instrument also costs in the 
neighborhood of $500+.


Most ham meters, including the Bird series are voltage sensing devices 
and presume the load to be some value which was used for calibration.  
Thus if the meter is in a true 50 ohm circuit, it will most likely be 
correct within the percentage of full scale accuracy.  However, if the 
meter was originally calibrated for 50 ohms and it is in a 20 ohm 
circuit the error will be significant. Thus most ham type power meters 
are "relative reading" instruments, and not absolute measuring instruments.


RF Amp meters are relatively easy to verify accuracy.  Being 
thermocouple devices, one can apply 60 Hz of some value of voltage and a 
known load and then determine the accuracy.   Again, I = E/R.


Did we forget about how to use Ohms Law?   Seems so.  Or perhaps we 
never knew to start with.


73

Bob, K4TAX




On 2/6/2022 12:47 PM, Mark Goldberg wrote:
The only way to really know for sure is to have a NIST traceable 
calibrated wattmeter and have it calibrated on a regular basis. Hams 
are generally too cheap to do that. The LP100 does come calibrated, so 
that would be my go to reference, but I'll bet Hams will hardly ever 
get the calibration checked after purchase. I could not find how much 
they charge for that service. Even that is only calibrated to 5% with 
3% typical. So, if you off 5W while measuring 100W, who knows, it 
might be just the calibration error.


73,

Mark
W7MLG

On Sun, Feb 6, 2022 at 10:11 AM Bob McGraw  wrote:

'Twas said "a man with one watch always knows the time.  A man
with 3 or
4 watches is never quite sure of the time.".

I just recently went through power calibrations on my K3S and my
KPA500.  All now agree with the power meter reference I used.
Also, this
was done using a known 50.5 ohm dummy load.  On the antennas, even
though SWR is indicated 1.1:1, there will be differences due to
difference line complex impedance's.

73

Bob, K4TAX


On 2/6/2022 9:51 AM, elecraft-requ...@mailman.qth.net wrote:
> Message: 15
> Date: Sat, 5 Feb 2022 14:53:59 -0600
> From: Ronnie Hull
> To: Dick Dievendorff
> Cc:Elecraft@mailman.qth.net <mailto:cc%3aelecr...@mailman.qth.net>
> Subject: Re: [Elecraft] KPA1500 wattmeter adjustment
> Message-ID:
> Content-Type: text/plain; charset=utf-8
>
> Lucky your that close! My K3, P:, Lp100 and kpa1500 are all
wa different. I accept the LPA100 as being correct!
>
> Ron W5SUM

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[Elecraft] KPA1500 wattmeter adjustment

[Bob McGraw]

'Twas said "a man with one watch always knows the time.  A man with 3 or 
4 watches is never quite sure of the time.".


I just recently went through power calibrations on my K3S and my 
KPA500.  All now agree with the power meter reference I used. Also, this 
was done using a known 50.5 ohm dummy load.  On the antennas, even 
though SWR is indicated 1.1:1, there will be differences due to 
difference line complex impedance's.


73

Bob, K4TAX


On 2/6/2022 9:51 AM, elecraft-requ...@mailman.qth.net wrote:

Message: 15
Date: Sat, 5 Feb 2022 14:53:59 -0600
From: Ronnie Hull
To: Dick Dievendorff
Cc:Elecraft@mailman.qth.net
Subject: Re: [Elecraft] KPA1500 wattmeter adjustment
Message-ID:
Content-Type: text/plain; charset=utf-8

Lucky your that close! My K3, P:, Lp100 and kpa1500 are all wa different. I 
accept the LPA100 as being correct!

Ron W5SUM


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[Elecraft] HI CURR indicator on K3S display

[Bob McGraw]

Well clearly one of the indications, radio or power supply, is incorrect.

Just checked mine:

TX @ 100 watts, radio display = 18.3 amps, Power supply = 19.0 amps.

Voltage:  Radio RX = 14.3, PS = 14.5.   Voltage:  TX Radio = 13.9v, PS 
=14.5v


If the power supply voltage drops during TX, the control circuit will 
attempt to produce 100 watts in which the current may increase.   Also, 
different bands at 100 watts will draw different amount of current 
during transmit.


I actually found with a 100 watt power setting on the radio, the actual 
output power was more than 120 watts.  (See the discussion on Power 
Calibration).  This would of course affect the current demand.


73

Bob, K4TAX


On 2/4/2022 2:16 AM, elecraft-requ...@mailman.qth.net wrote:

Message: 4
Date: Tue, 1 Feb 2022 18:12:38 -0600
From: "Dr. William J. Schmidt"
To:
Subject: [Elecraft] HI CURR indicator on K3S display
Message-ID:<006401d817c9$990051f0$cb00f5d0$@wjschmidt.com>
Content-Type: text/plain;   charset="us-ascii"

I remember some discussion about HI CURR issues and the causes here a while
ago.  I just noticed it on my radio.. Changing the display to read amps, it
indicates 21.6 amps, but the amp meter on the power supply is only showing
10.1 amps.  The radio sensing circuit seems to be in error.  Anyone else
delt with this?

  

  


Dr. William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ
VP2EHZ


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[Elecraft] What happened to ALC?

[Bob McGraw]

I'll show my age by doing this, but lets revert mentally back to the 
Collins S Line.   The transceiver, using a pair of 6146's in the PA, was 
most efficient and linear when properly tuned and loaded.  It produced 
about 120 to 140 watts of PEP output.  And there was NO Power control or 
method to reduce the power as we know it today.   Introduce the 30L1 
linear amplifier, being 4 x 811's, which required about 60 to 80 watts 
of drive to reach maximum rated output.  So the issue now is, how do we 
get the properly tuned and loaded transceiver down to the correct drive 
level for the 30L1?   ALC is the Collins answer.  Thus the voltage 
determined by the amplifier grid current was fed back to the inter-stage 
of the driving transmitter to effectively reduce the output while still 
retaining the correct tuning and loading of the transceiver PA.


Today it seems that the designers have monkeyed around with the time 
constants in the ALC algorithm to improve certain aspects of the signal, 
thus reducing key clicks and overshoot,  but seemingly at the sacrifice 
of certain other areas of the signal.  Thus we find that ALC is not to 
be used to control power or raise the average power but designed to 
prevent over drive of any stage. Correctly, Speech Processing is deemed 
much more effectively used and with less undesired effects on speech 
than ALC.   In fact, one amp manufacturer says "run the transmitter at 
full power and let the Smart ALC in the amplifier adjust the required 
drive accordingly via the ALC signal".  Oh wow!  Certainly asking for 
trouble in my thinking.


In my world of audio, ALC is much like limiting with an input to output 
ratio of 20:1.  This says a 20 dB increase on the input causes only a 1 
dB change in output.  Now enter compression, where the input to output 
ratio is anywhere from 1:3 to about 10:3. Again a 10 dB input change 
yields a 3 dB output. Of course there are different attack times and 
release times applied to both limiting and compression.  Newer 
technology systems have the ability to analyze the various components of 
the input signal and adjust the attack and release times quite 
effectively.  Many Speech Processing algorithms have the same ability.  
Thus they are better suited for raising average PEP output.


A second factor existing is the issue where hams like to see their power 
meter indicate the rated transceiver power.  With some of the electronic 
power measuring devices that may work OK. However, with mechanical power 
indicating devices, the ballistics of the meter movement, meaning the 
slow response and overshoot damping, will not allow a mechanical meter 
to correctly show the energy level of ones SSB voice signal.  The 
typical mechanical movement shows about -6 dB less or 25 watts for a 100 
watt PEP signal. Of course speech processing will raise the average PEP 
level, but again the true PEP remains at 100 watts.


And as Paul Harvey would say; "and now you know the rest of the story".

73

Bob, K4TAX


On 1/31/2022 9:01 PM, elecraft-requ...@mailman.qth.net wrote:

On Jan 30, 2022, at 1:10 PM, Fred Jensen  wrote:

I can remember, shortly after SSB appeared on the ham bands that "ALC" showed 
up and was immediately inducted into that top category of things like canned beer and 
sliced bread.  It would reduce the dynamic range of your signal and fill out your RF 
envelope with DX inducing energy.  It didn't matter if you preferred the James Earl Jones 
sound by close talking your microphone, or the Storm Drain sound with the gain up and 
speaking from across the room.  Not to worry, ALC will take care of it for you and you 
will fully pack your RF envelope.

Tomorrow is the first day of February 2022 and ALC occupies a less than coveted spot in the same 
category that also contains last night's broccoli casserole.  One wonders why manufacturers even 
put connectors and meters labeled "ALC" on their radios.  "Four solid bars, and the 
fifth barely flashing because the fifth bar is where ALC starts.  Just barely flashing ... you DO 
NOT want to engage the ALC!"

I realize that while we believe that the rules of electricity don't change and 
none of us ever inspect our electricity very closely ... if we did we'd find 
the power company is selling us used electricity as if it was new ... what 
changed?  If ALC was slicker than snot back then, why isn't it now?

73,

Fred ["Skip"] K6DGW
Sparks NV DM09dn
Washoe County


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[Elecraft] K3S-100 Power Calibration

[Bob McGraw]

While most may be concerned with lower than rated TX power, I've come to 
the conclusion my K3S is running more than rated power. I've followed 
the instructions in the manual for Power Calibration and used the 
Utility to perform TX Power Calibration.  Having done this several 
times, and using two different external power meters, which both agree, 
when the PWR is set to 100 watts the output power is 120 to 125 watts.  
During the Power Calibration routine, these meters indicate 6 watts when 
the calibration calls for 5 watts.  And when the 50 watt routine is 
running the power meters indicate 60 watts.  The Utility indicates that 
power calibration was successful on all bands.


I can set the radio PWR value to 80 watts and have an indicated 100 
watts output.  The data and measurements are obtained using my Bird 43 
with a 100H element and a Daiwa CN-801 both between the radio and a 50 
ohm dummy load.


So what am I missing in the procedure?  I'd hope to have the radio 
produce 100 watts when it is set for 100 watts.  My concern is that 
values greater than 100 watts, as per the manual, will have less that 
optimum IMD specified performance.


73

Bob, K4TAX


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[Elecraft] On ground - in ground radials

[Bob McGraw]

I made a handful of staples using some scrap solid wire.  #10, #12, #14 
works great and no need to remove the insulation.   Make them about 4" 
long per side, and place them over the radial, pushing them into the 
ground.  I agree, cut the grass short, pull the radial tight and "staple 
it to the ground".


I don't care for nails, or the likely hood of such,  in my lawn tractor 
tires.


73

Bob, K4TAX



On 1/16/2022 11:40 AM, elecraft-requ...@mailman.qth.net wrote:

Message: 9
Date: Sun, 16 Jan 2022 11:20:11 -0500
From: Tom & Barb Valosin
To:elecraft@mailman.qth.net
Subject: Re: [Elecraft] On ground - in ground radials
Message-ID:<8d6b4b1b-cd91-59ba-c485-0f49b0d5a...@midtel.net>
Content-Type: text/plain; charset=UTF-8; format=flowed

Now in my mid seventies I have embraced the idea of conservation of
energy. Digging in radials does not interest me. Likewise, catching them
in lawn equipment is also a PIA. So, here is what I have done and it has
worked well. I trim the grass.? Then I use a length of string and
stretch it out along the path of the future radial. Next I take a
"weed-wacker" and shorten the grass a bit more. Now I use any old
available can of spray paint and spray a few marks along the length of
the string. Remember to roll up the string now - no longer needed. Then
I take my radial wire, make the connection at the antenna base and
stretch the wire out along the marked path. Depending of the
levelness/evenness of the surface I then take a nail and make one wrap
of the radial around the nail, tighten the wire so it is straight with
no loops and insert the nail into the dirt. Do this along the length of
the radial. Typically I do it about every 10 to 15 feet. In a couple of
days the grass grows and the wire is so low (deeply embedded) in the
grass that mowing will not be an issue. The entire radial system need
not be done at one time and it is easy to add radials if you wish. HINT
- get a grandchild to help, or a neighborhood youngster or a person
working toward their license or one of the younger club members or .
anyone but yourself. Remember however to compensate them for their time
and effort!

Tom, WB2KLD


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[Elecraft] K Line: Signal loss in a QSO

[Bob McGraw]

The logical explanation is from Keith, one of the K3 techs at 
Elecraft.   He said;  "avoid 5 watts and 50 watts" That's 
logical enough for me.


73

Bob, K4TAX


On 1/16/2022 11:40 AM, elecraft-requ...@mailman.qth.net wrote:

Message: 1
Date: Sun, 16 Jan 2022 07:06:34 -0700
From: Wes
To:elecraft@mailman.qth.net
Subject: Re: [Elecraft] K Line: Signal loss in a QSO
Message-ID:<2bd9c23b-1ee9-0976-f88e-c4dd25080...@triconet.org>
Content-Type: text/plain; charset=UTF-8; format=flowed

It is not in the manual, but has appeared here many times, without logical
explanation.

Wes? N7WS

On 1/16/2022 6:52 AM,j...@kk9a.com  wrote:

I have not heard this either. Is this in the manual? 5 watts would be a
tough output to avoid if you enjoy QRP.

John KK9A

KE8G wrote:

Hmm, I've never heard that 5 or 50 watts of power shouldn't be run.

73 de KE8G - Jim


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[Elecraft] K Line: Signal loss in a QSO

[Bob McGraw]

In SSB mode, until you speak into the mike, there is no output signal in 
transmit mode.  Switch to CW mode, key the radio via an external key or 
paddle and see what you have.  Or press XMIT/TUNE function for 2 
seconds.  You should have output.   Also check to see what value of PWR 
is set on the radio.    I use 20 watts for TUNE for all bands when the 
KPA500 is in OPER  mode.



73

Bob, K4TAX


On 1/16/2022 8:01 AM, elecraft-requ...@mailman.qth.net wrote:

Message: 6
Date: Sat, 15 Jan 2022 10:15:29 -0600
From: rikoski
To:elecraft@mailman.qth.net
Cc: Richard Rikoski
Subject: [Elecraft] K Line: Signal loss in a QSO
Message-ID:
Content-Type: text/plain;   charset=utf-8

I have a K3, P3, KAT500 and KPA500. I was listening in the middle of a QSO and 
lost signal.

I tested my antenna with a back up transceiver and the antenna and coax are 
good.

The P3 still shows signals but only hiss comes out of the K3?s speaker.

Keying the k3 by pressing the attached foot pedal turns on the red Tx light on 
the K3 but the display on the KPA500 shows an asterisk to the left of the power 
out reading of zero on its display.

No signal goes to the antenna and nothing besides hiss comes out of the speaker.

What should I do next?

Thanks. W9ZD


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[Elecraft] Elecraft -- tarnished, bent and broken crown

[Bob McGraw]

I view the quality of the design and the quality of the manufacturing 
process for Elecraft product is at least equal, and in many cases, 
better than most other ham equipment companies. I for one did beta 
testing, both hardware and firmware, for several models for another ham 
radio company.  Plus, I spent the last 15 years of my professional 
career in electronics manufacturing for a large Japanese company as a 
Tech Support manager and Quality Compliance manager.   Thus I believe I 
have slightly more than a lay persons knowledge of the processes.


The fact you had issues with your KPA500 and KAT500, and I own both of 
those, is unfortunate.  Yet you say your SB-220 was never opened for 
repairs.  Likewise, the model A Flathead Ford engine had the spark plugs 
clearly visible on the head.  And with today's Ford's, you'd be lucky to 
find the spark plugs.   I really don't think one can fairly nor 
accurately compare a KPA500 to a SB-220. I've assembled and owned one of 
those as well.   Try to get the SB-220 on 160M or 6M as well as the band 
between.


Rule #1 - If man designed it and man built it..it will fail at some 
point and will need service.    Having operated a radio repair business, 
repairing ICOM, Yaesu, Kenwood, and other radios, both ham and public 
service,  I can tell you many of the repairs required were due to 
operator induced errors.


I've always proclaimed...Just because it is new, this is no 
assurance it is a good working product.   All companies have an expected 
"out of the box" failure rate on new products. That is usually X 
number per 1000 units.  That expected failure rate is therefore never zero.


Bob, K4TAX


On 1/14/2022 12:26 PM, elecraft-requ...@mailman.qth.net wrote:

Message: 1
Date: Thu, 13 Jan 2022 22:29:33 +
From: Tim C
To:"elecraft@mailman.qth.net"  
Subject: [Elecraft] Elecraft -- tarnished, bent and broken crown
Message-ID:



Content-Type: text/plain; charset="us-ascii"

Elecraft - Tarnished, bent and broken crown.  For many years I believed 
Elecraft was king.  Now I'm not so sure.  I purchased a KPA500 and KAT500.  I 
assumed with all the trouble, protective, and shutdown circuits they would last 
a long time and probably never need service.

The Elecraft service tech erroneously advise me to ship it to Calif when it 
would not transmit which cost $71.  Turn out to be an interface cable and not 
the amp.  The amp didn't need to be shipped.  I had to pay $67 for another 
cable which should have been warranted.

Some months past and the amp wouldn't transmit again.  An Elecraft services 
tech advised me to ship it back to calif since it was under warrantee.  This 
time the shipper charged $140 because the nursing home where I live was 
required to ship it commercial and insured.  The tech could have suggest the 
obviously burned resister be replaced.

I have been a ham for over 50 years.  I had a SB-220 for over 40 years and 
never had to disassemble it for repairs.  I've owned Yaesu's, Icom's and 
Alinco's, all new, and never had ship any of them for repairs or even repair 
them after years of use.

I have always heard only praise for Elecraft product.  There are less costly 
tuners and amps on the market but I believed Elecraft would be the most durable 
and reliable.

Before I purchase another Elecraft product I will do even more research and 
comparisons.

73, Tim WB8HRO


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Re: [Elecraft] Elecraft Digest, Vol 213, Issue 6

[Bob McGraw]

Based on my measurements and method I used to measure 100 ft of window 
line, the loss in the line from dry to wet is frankly nil. However, the 
wet line does show a velocity factory change, in effect an electrical 
change in line length, and thus when connected to an antenna, will have 
a small effect on the impedance at the station end of the line.


I really think and believe many comments and opinions regarding window 
line, are more "old ham lore" not based on true and complete facts.


73

Bob, K4TAX


On 1/14/2022 12:26 PM, elecraft-requ...@mailman.qth.net wrote:

Message: 17
Date: Fri, 14 Jan 2022 11:26:13 -0700
From:ho13d...@gmail.com
To:elecraft@mailman.qth.net
Subject: Re: [Elecraft] [OT] Loss in window line [OPINION] [LONG]
Message-ID:
Content-Type: text/plain;   charset=us-ascii


I concur with the conclusion that water has little effect on window line. I 
base this on my own experience using window line for years. I always feed it 
into a tuner and, if water has any effect on the line, I have to adjust the 
settings of the tuner. It is only necessary to adjust the tuner under very 
heavy rain. Anything resembling a normal amount of water on the line has 
essentially no effect, even after years of dirt buildup.

Years ago, when I had a swimming pool, I spanned the pool with a length of 
underwater ladder line and made some simple measurements that indicated only a 
nominal change. And pool water is purposely chlorinated, which increases the 
conductivity, although I don't know by how much.

73 de dave
ab9ca


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[Elecraft] New wattmeter plans?

[Bob McGraw]

Why not just buy a nice clean Bird 43P and a new element or two. Not 
hamfest elements.   That works for me and gives total confidence on what 
I see as power output.   Of course if one desires all equipment to 
match, then so be it.


73

Bob, K4TAX

On 1/13/2022 3:23 PM, elecraft-requ...@mailman.qth.net wrote:

Message: 22
Date: Thu, 13 Jan 2022 03:04:24 + (UTC)
From: Steve Masticola
To:"elecraft@mailman.qth.net"  
Subject: [Elecraft] New wattmeter plans?
Message-ID:<705597201.2718380.1642043064...@mail.yahoo.com>
Content-Type: text/plain; charset=UTF-8

I bought a W2 today, because my Meterbuilder MB-1 wattmeter's directional 
coupler died and the product seems to be an orphan. But I wonder if Elecraft 
has any plans to bring out an updated wattmeter. The W2's design is ten years 
old, and the LED bargraph displays are getting a bit long in the tooth.
Any rumors, or more than rumors?

73, -Steve WX2S


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Re: [Elecraft] Problem with KAT500 firmware v. 2.05

[Bob McGraw]

Oh I intended to add, I run 20 watts as my TUNE power.

Also my other wire antenna, 240 ft center fed with 85 ft of 400 ohm 
window line terminating to a hybrid 4:1 Guanella current balun and 1:1 
Guanella current balun will match every frequency between 160M and 10M.


On 6M I  bypass the tuner as the internal circuit has a slightly higher 
SWR than my 4 ele yagi.


73

Bob, K4TAX

On 1/3/2022 11:01 AM, Bob McGraw wrote:
I don't find that to be the case with my KAT500.  Upgraded to 2.05 a 
couple of weeks ago.  I just ran 80M every 25 kHz from 3.525 to 
3.975.  The original memories and a few added show 1.0:1 on my K3S at 
all points.  The external SWR/PWR meter between the radio and tuner 
input agrees.  The antenna is resonant at 3.825 MHz and there is a 40M 
dipole from the same feed point.  There is a 1:1 current balun at the 
feed point and the feed line is 75 ft of RG-213.


73

Bob, K4TAX


On 1/2/2022 7:43 PM, elecraft-requ...@mailman.qth.net wrote:

Message: 12
Date: Sun, 2 Jan 2022 11:46:14 -0600
From: Bart Campbell
To: Elecraft Reflector
Subject: [Elecraft]
Message-ID:

Content-Type: text/plain; charset="UTF-8"

I upgraded one of my KAT500 tuners to firmware version 2.05.  I had 
already

upgraded the KAT500 utility to the current version, so no issues there.
After the upgrade, the KAT500 is unable to find a tuning solution on 
my 80

meter dipole.  My first thought was that there was an issue with the
dipole, but I checked it with an AA-230 antenna analyzer and there 
was no

change from previous measurements.  I then switched the upgraded KAT500
with another KAT500 that I have which was running firmware version 1.75.
It found a tuning solution on the dipole just fine, as has always 
been the

case with the first KAT500 prior to the firmware upgrade.  So, I
"downgraded" the updated KAT500 to firmware version 1.75 and it once 
again

was able to easily find a tuning solution for the 80 meter dipole.  It
seems that something in the tuning algorithm was changed in the latest
firmware that affects the tuner's ability to find a tuning solution 
on 80

meters (I did not notice this issue on other bands after I updated the
firmware, but I concentrated my troubleshooting on the 80 meter dipole).

Any ideas?  I really want to use the latest firmware to take 
advantage of

the capability to accept transceiver TX frequency messages in Kenwood
format.

Bart, NS4X


--


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[Elecraft] Problem with KAT500 firmware v. 2.05

[Bob McGraw]

I don't find that to be the case with my KAT500.  Upgraded to 2.05 a 
couple of weeks ago.  I just ran 80M every 25 kHz from 3.525 to 3.975.  
The original memories and a few added show 1.0:1 on my K3S at all 
points.  The external SWR/PWR meter between the radio and tuner input 
agrees.  The antenna is resonant at 3.825 MHz and there is a 40M dipole 
from the same feed point.  There is a 1:1 current balun at the feed 
point and the feed line is 75 ft of RG-213.


73

Bob, K4TAX


On 1/2/2022 7:43 PM, elecraft-requ...@mailman.qth.net wrote:

Message: 12
Date: Sun, 2 Jan 2022 11:46:14 -0600
From: Bart Campbell
To: Elecraft Reflector
Subject: [Elecraft]
Message-ID:

Content-Type: text/plain; charset="UTF-8"

I upgraded one of my KAT500 tuners to firmware version 2.05.  I had already
upgraded the KAT500 utility to the current version, so no issues there.
After the upgrade, the KAT500 is unable to find a tuning solution on my 80
meter dipole.  My first thought was that there was an issue with the
dipole, but I checked it with an AA-230 antenna analyzer and there was no
change from previous measurements.  I then switched the upgraded KAT500
with another KAT500 that I have which was running firmware version 1.75.
It found a tuning solution on the dipole just fine, as has always been the
case with the first KAT500 prior to the firmware upgrade.  So, I
"downgraded" the updated KAT500 to firmware version 1.75 and it once again
was able to easily find a tuning solution for the 80 meter dipole.  It
seems that something in the tuning algorithm was changed in the latest
firmware that affects the tuner's ability to find a tuning solution on 80
meters (I did not notice this issue on other bands after I updated the
firmware, but I concentrated my troubleshooting on the 80 meter dipole).

Any ideas?  I really want to use the latest firmware to take advantage of
the capability to accept transceiver TX frequency messages in Kenwood
format.

Bart, NS4X


--


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[Elecraft] Cleaning solder flux

[Bob McGraw]

Sure..at the place I worked we ran all the populated boards after 
wave solder through a commercial dishwasher with hot water. The flux was 
a petroleum based product as I recall.


73

Bob, K4TAX


On 1/2/2022 7:43 PM, elecraft-requ...@mailman.qth.net wrote:

Message: 10
Date: Sun, 2 Jan 2022 11:47:57 -0500
From: Jim Bruce
To:b...@wjschmidt.com
Cc:elecraft@mailman.qth.net
Subject: Re: [Elecraft] Cleaning solder flux
Message-ID:

Content-Type: text/plain; charset="UTF-8"

In all of the places I worked beginning with the Air Force we used
isopropyl alcohol to remove flux from repairs on boards with the exception
of one. At I believe General Radio(GenRad) in Rockville, Md we used banana
oil for flux removal.

Has anyone else used something other than alcohol??


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[Elecraft] K3 Noise Reduction

[Bob McGraw]

Only needs to done once per band unless the noise source really 
changes.   Of course the contest guys are changing bands every 3 
milliseconds, so that might be a chore.


73

Bob, K4TAX

On 12/16/2021 4:19 PM, elecraft-requ...@mailman.qth.net wrote:

Message: 8
Date: Wed, 15 Dec 2021 11:52:54 -0700
From: David Gilbert
To:elecraft@mailman.qth.net
Subject: Re: [Elecraft] K3 Noise Reduction
Message-ID:<104029f2-7c47-ebca-3e8b-d3bf3015a...@gmail.com>
Content-Type: text/plain; charset=UTF-8; format=flowed



I applaud the persistence it must have taken you to come up with that
procedure, but it's actually kind of amusing to think about repeatedly
doing all of that during a contest.

73,
Dave?? AB7E



On 12/15/2021 9:52 AM, Bob McGraw wrote:

The approach I use for the Noise Blanker is this.

I first activate the NB and then the Level.?? I start with the DSP OFF
and the IF OFF.? I then adjust the DSP value for optimum results
without it destroying the quality of the signal.? DO MAKE A NOTE OF
THIS VALUE.? Then set the DSP back to OFF.? Then move to the IF and
scroll through the settings in an effort to find optimum results.?
Once this is done, leave the IF value as determined and return to the
DSP and set it to the value previously determined.

This works for a given band and given type of noise.? Change bands or
noise and do it all again.? There is no ONE setting correct for every
condition. ? Right now my 6M noise buzz is S-7 with the NB off.? Then
turning it ON and adjusted as above the 6M noise is S-3.? That's 4 S
units or 24 dB improvement.? I doubt you will get much better than this.

As to Noise Reduction, I find it best performs for CW mode. Again it
takes careful adjustment to obtain optimum results.?? I don't use NR
for SSB signals. I prefer to adjust the Attenuation value and the RF
Gain to produce optimum results when operating SSB.?? I find optimum
results occur when the no signal band noise is about 10 dB above the
receiver noise floor.?? In order to accomplish this operating point,
one will need to use ATTENUATION and RF Gain reduction.?? More gain
won't aid in receiving weak signals, but just the opposite, as the
signal will pop out of the noise.

I generally find using either NB or NR, but not both, is the better
way to operate.? I doubt there is anything wrong with your radio.?
Most likely the result is more related to receiver setting parameters.

73

Bob, K4TAX

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Re: [Elecraft] Output power being eaten

[Bob McGraw]

Yes, I agree that true open wire line does not have that issue. However, 
in as much as I have the feed-line from the antenna, standing off of the 
tower some 18", entering through an eve vent, then through the attic 
supported under the wood roof rafters, and dropping down through the 
ceiling to my operating position, using true open wire line would be a 
challenge.  In my installation, I add 10 twists per 10 ft so as to 
minimize any adjacent item causing unbalance plus minimize any wind 
loading.  With true open wire line, this would be a challenge.


I've used this system for more than 25 years with a great deal of 
success and very little to zero issues.  It is just ones understanding 
the need for a slight adjustment of the ATU values to compensate for 
weather changes.  No different than frequency changes.  The KPA500 or 
the KAT in the radio handles any needed changes 100%.  The currents in 
each side of the line are balanced to 5% or better and there is no 
measurable common mode current.


I wish more hams understood this and they would likely have better 
antenna systems, as opposed to some of the haywire crap I've see at some 
QTH locations.


Thanks

73

Bob, K4TAX


On 12/28/2021 11:46 AM, Lyn Norstad wrote:

Bob -

Should you ever feel the need to replace your feedline, open wire line will 
solve that problem.

73
Lyn, W0LEN

-Original Message-
From: elecraft-boun...@mailman.qth.net 
[mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Bob McGraw
Sent: Monday, December 27, 2021 7:36 PM
To: elecraft@mailman.qth.net
Subject: [Elecraft] Output power being eaten

I doubt that ice on the antenna would have any effect in terms of
increased loss.   However, I would expect the resonant frequency to
change and thus the need to adjust the tuner.   If it is and ATU /
automated tuner, then perhaps a bit too low power may cause the SWR
bridge to read incorrectly.

I use a KAT500 and my TUNE power is 20 watts.  This assures the ATU and
SWR circuits have adequate signal to perform the desired function.   As
to the SPE 1.3K amp, as fussy as they are, I'm surprised it didn't trip
off line.

My experience with antenna's changing due to moisture is with my
balanced center fed wire which uses window line for the feed.  It
accumulates moisture, frost, rain, snow, and ice.  The change I do see
is due to the velocity change of the balanced feed.  My measurements of
a couple of years back indicated the length of the line changed
electrically thus a velocity factor change.  Any loss, wet or dry, under
matched conditions was not measurable over a length of 100 ft on 20M.
Therefore, I would expect the mis-matched loss to be about as the book
say.  Again, either wet or dry.

73

Bob, K4TAX

On 12/27/2021 4:10 PM, elecraft-requ...@mailman.qth.net wrote:

Message: 21
Date: Mon, 27 Dec 2021 14:10:25 -0800
From: Fred Jensen
To: Elecraft Reflector
Subject: Re: [Elecraft] Output power being eaten
Message-ID:<8c012d97-f62d-b342-4ec3-20db2e8f5...@gmail.com>
Content-Type: text/plain; charset=utf-8; format=flowed

I doubt that pogonip or even solid ice on your antenna would have major
effects [well, except for weight].? Ice forming from water directly from
the sky is a pretty good insulator.? We had a very large Log-Periodic on
the roof of the hangar at my first USAF assignment in the remote
northern interior of KL7.? Lots of ice fog creating rime ice on the
elements in the dead of winter, much of which was -35 C or below.? In
the so-called spring, solid ice would form on them, and there was
essentially no perceptible change in the antenna performance.? If your
ATU wasn't getting enough power to tune, it was probably "eating your
power" rather than the ice on the antenna.

At home, I have an HOA "WOOF" antenna [Wire On Organic Fence] at about 2
m AGL.? We've been having a series of snowstorms, the top of the fence,
including the wire, was encased in snow yesterday for the 40 m ECN, and
it worked as good as it ever does.

73 & HNY,

Fred ["Skip"] K6DGW
Sparks NV DM09dn
Washoe County

Bill Frantz wrote on 12/27/2021 11:48 AM:

I didn't have a good night in the K1USN Slow Speed Test. I started
more-or-less on time and tried to answer CQs. None of the stations I
tried
could hear me. My SPE 1.3K amp said I was putting out about a kilowatt,
although the antenna tuning on my normally low SWR 40M dipole needed
to be
redone. I was receiving many stations, at normal levels.

After a few minutes, I started searching for causes, since operators
calling CQ weren't hearing me and sending CQ again. Some of these
operators had worked other stations, so I knew their radios were
basically working. I tried maybe a half a dozen stations.

Finally, in desperation, I raised the tune power in my K3 exciter to 15W
and retuned the dipole yet again. Things started working and I managed to
check into the Elecraft 40M CW net via KD5ONS in OR at 0050z. With only 5
minutes in the contest left, I man

[Elecraft] Output power being eaten

[Bob McGraw]

I doubt that ice on the antenna would have any effect in terms of 
increased loss.   However, I would expect the resonant frequency to 
change and thus the need to adjust the tuner.   If it is and ATU / 
automated tuner, then perhaps a bit too low power may cause the SWR 
bridge to read incorrectly.


I use a KAT500 and my TUNE power is 20 watts.  This assures the ATU and 
SWR circuits have adequate signal to perform the desired function.   As 
to the SPE 1.3K amp, as fussy as they are, I'm surprised it didn't trip 
off line.


My experience with antenna's changing due to moisture is with my 
balanced center fed wire which uses window line for the feed.  It 
accumulates moisture, frost, rain, snow, and ice.  The change I do see 
is due to the velocity change of the balanced feed.  My measurements of 
a couple of years back indicated the length of the line changed 
electrically thus a velocity factor change.  Any loss, wet or dry, under 
matched conditions was not measurable over a length of 100 ft on 20M.   
Therefore, I would expect the mis-matched loss to be about as the book 
say.  Again, either wet or dry.


73

Bob, K4TAX

On 12/27/2021 4:10 PM, elecraft-requ...@mailman.qth.net wrote:

Message: 21
Date: Mon, 27 Dec 2021 14:10:25 -0800
From: Fred Jensen
To: Elecraft Reflector
Subject: Re: [Elecraft] Output power being eaten
Message-ID:<8c012d97-f62d-b342-4ec3-20db2e8f5...@gmail.com>
Content-Type: text/plain; charset=utf-8; format=flowed

I doubt that pogonip or even solid ice on your antenna would have major
effects [well, except for weight].? Ice forming from water directly from
the sky is a pretty good insulator.? We had a very large Log-Periodic on
the roof of the hangar at my first USAF assignment in the remote
northern interior of KL7.? Lots of ice fog creating rime ice on the
elements in the dead of winter, much of which was -35 C or below.? In
the so-called spring, solid ice would form on them, and there was
essentially no perceptible change in the antenna performance.? If your
ATU wasn't getting enough power to tune, it was probably "eating your
power" rather than the ice on the antenna.

At home, I have an HOA "WOOF" antenna [Wire On Organic Fence] at about 2
m AGL.? We've been having a series of snowstorms, the top of the fence,
including the wire, was encased in snow yesterday for the 40 m ECN, and
it worked as good as it ever does.

73 & HNY,

Fred ["Skip"] K6DGW
Sparks NV DM09dn
Washoe County

Bill Frantz wrote on 12/27/2021 11:48 AM:

I didn't have a good night in the K1USN Slow Speed Test. I started
more-or-less on time and tried to answer CQs. None of the stations I
tried
could hear me. My SPE 1.3K amp said I was putting out about a kilowatt,
although the antenna tuning on my normally low SWR 40M dipole needed
to be
redone. I was receiving many stations, at normal levels.

After a few minutes, I started searching for causes, since operators
calling CQ weren't hearing me and sending CQ again. Some of these
operators had worked other stations, so I knew their radios were
basically working. I tried maybe a half a dozen stations.

Finally, in desperation, I raised the tune power in my K3 exciter to 15W
and retuned the dipole yet again. Things started working and I managed to
check into the Elecraft 40M CW net via KD5ONS in OR at 0050z. With only 5
minutes in the contest left, I managed QSOs with W6SX and VE5MX.
Thanks to
both of them.

My current theory about what was happening is that ice on the antenna was
eating transmit power, although receive seemed normal. Does ice seem a
reasonable explanation? What else could be the cause? I'd love to come up
with a believable answer. Even more so, avoid the situation in the
future.

73 Bill AE6JV

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[Elecraft] Simulated Stereo

[Bob McGraw]

Yuck!  As a retired recording studio engineer, CBS Records, having the 
same signal out of phase by 180 degrees to one ear, is much like 
sticking and ice pick in ones ears.


Most systems will have a variable phase shift depending on frequency, 
usually not to exceed 30 degrees.   In this case, the leading phase 
signal will appear from that direction.   In others, bandpass filtering 
moves the higher frequency to one side and the lower to the other.  From 
an audio perspective, this still sounds like "fake stereo".    It is 
just messed up monaural.  There's lots of that today.


The K3S has the AFX function that does an excellent job of signal 
spatialization and sounds quite nice on SSB signals.


73

Bob, K4TAX


On 12/27/2021 4:10 PM, elecraft-requ...@mailman.qth.net wrote:

Message: 1
Date: Sat, 25 Dec 2021 16:46:03 -0700
From: Douglas Hagerman
To: Elecraft Mailing List
Subject: Re: [Elecraft] Simulated stereo
Message-ID:
Content-Type: text/plain;   charset=us-ascii


The K3 (and I think the KX3 and K4) has a simulated stereo function
which allows you delay the audio to one channel slightly, which makes
signals seem to stand out from the noise. I believe that the radios
newer than the K3 also have the ability to create stereo separation by
pitch, which helps in picking out CW signals in QRM.

My question is: is there some kind of device that you can get that will
take the monaural audio from a non-Elecraft radio or a K2 and produce
similar effects?
--
73,
Victor, 4X6GP
Rehovot, Israel
CWops #5
Formerly K2VCO
https://www.qsl.net/k2vco/

Some of the various Heil headphones, including the one on the Elecraft site, 
have a switch that passively selects between mono and simulated stereo by 
changing the phase between the two sides. It basically seems to widen the 
perceived space of the sound source, possibly helpful.

Doug, W0UHU.






--




On 2021-12-25 6:46 PM, Douglas Hagerman via Elecraft wrote:


Some of the various Heil headphones, including the one on the
Elecraft site, have a switch that passively selects between mono and
simulated stereo by changing the phase between the two sides.

Any*Stereo*  headphones can accomplish the same thing by simply adding
a DPDT switch wired to reverse the connections (invert polarity) to
one of the two ears.

73,

 ... Joe, W4TV

On 2021-12-25 6:46 PM, Douglas Hagerman via Elecraft wrote:

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[Elecraft] Kat500 Firmwar

[Bob McGraw]

Richard et al:

Just checked my KAT500 and it had V1.75 installed.  Then with the KAT500 
Utility, version 1.21.9.15, I did download the firmware from the 
Elecraft site and install V2.05 into my KAT500.   I saw no issues.  
Running a Windows 10 Pro 64 bit computer.


73

Bob, K4TAX


On 12/20/2021 6:18 PM, elecraft-requ...@mailman.qth.net wrote:

Message: 23
Date: Mon, 20 Dec 2021 19:18:48 -0500
From: Richard Gilley
To:elecraft@mailman.qth.net
Subject: [Elecraft] Kat500 Firmware
Message-ID:<1b3a4757-fc90-4c7c-a560-807c9de63...@gmail.com>
Content-Type: text/plain;   charset=utf-8

Hi,
Having difficulty loading latest version of the Kat500 utility.  The 
version I have is 01.75, the utility indicates that 2.05 is available.  However 
the new version does not load but the message ? Input hex file is corrupt, 
check sum is not zero?

I have the same issue attempting to load a Mac and Linux.

Perhaps 2.05 is not available?  Or is there a fix I am not aware of, or perhaps 
it is not necessary to upgrade?

Thank you for your interest. Help would be appreciated.

Best
AD1G


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[Elecraft] RFIth

[Bob McGraw]

For those using the clamp-on ferrite devices, when installing them, be 
sure part A closes completely and solidly contacts part B.   Otherwise, 
there is no flux path and the device is ineffective.  If it is closed 
and loose on the cable, then that's good.   If it is closed or difficult 
to close, it isn't large enough for the cable and will likely not be 
effective.   Any gap between the halves renders it worthless for the 
application.


73

Bob, K4TAX


On 12/20/2021 6:18 PM, elecraft-requ...@mailman.qth.net wrote:

Message: 11
Date: Mon, 20 Dec 2021 08:34:24 -0800
From: Dave
To:elecraft@mailman.qth.net
Subject: Re: [Elecraft] RFI
Message-ID:<8cdb19ae-b111-5a6c-3f2a-d29efdd25...@nk7z.net>
Content-Type: text/plain; charset=utf-8; format=flowed

Hi,

Purchase some FT240-31 ferrite cores,
(https://www.farnell.com/datasheets/1912768.pdf), and wind at least 5
turns of each cable going to, or from, the computer through the ferrite.

I have several of these, and they stopped ALL of my RFI issues with my
computer, and with a weather station I have as well.

Shop around looking for the best price, some folks are asking 10 bucks
for one of these, others are asking 5 bucks...  I use Newark, and
Digikey as my goto places.

Also look to K9YC's site, for more information on how to make the chokes...

http://k9yc.com/2018Cookbook.pdf

73, and thanks,
Dave (NK7Z)
https://www.nk7z.net
ARRL Volunteer Examiner
ARRL Technical Specialist, RFI
ARRL Asst. Director, NW Division, Technical Resources


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[Elecraft] K3 Frequency Calibration

[Bob McGraw]

The method I use seems to work great and be easy enough to do. No zero 
beating required and no external measurements required.


Put the radio in CW mode, tune to a WWV frequency and press and release 
SPOT.  The radio will automatically zero to the carrier with a tone that 
matches your preferred CW note.  Then via the CONFIG MENU go to REF CAL 
and adjust up or down with the VFO A knob,  the number of Hz error the 
previous SPOT routine disclosed.   A 10 Hz change on the REF CAL will 
equate to about 2 Hz at 10 MHz.    I find that checking several 
different WWV frequencies is even better using this method.   To make 
sure it is optimum, tune to 5 or 10 Hz above and below each of the WWV 
frequencies.  Press SPOT from both above and below and see how it 
resolves.   Usually I can get within 2 Hz or better on all of them.  You 
may need to do this several times.  Be sure the radio has been on for at 
least 1/2 hour to allow things to stabilize.


73

Bob, K4TAX



Message: 4
Date: Thu, 16 Dec 2021 18:46:59 -0500
From: Don Wilhelm
To: Pete Smith N4ZR, Elecraft List

Subject: Re: [Elecraft] K3 Frequency Calibration
Message-ID:<81d4d693-6cd1-f11b-30b7-d4523ce74...@w3fpr.com>
Content-Type: text/plain; charset=UTF-8; format=flowed

Pete,

When using WWV to set the K3 reference, make certain you are listening
to the carrier.? WWV is an AM signal that is modulated by a 500 or 600
Hz tone on alternate minutes (440 Hz 2 minutes after the hour).? That
produces tones that are both above and below the carrier.
So be certain you are hearing the carrier and not one of the modulating
tones.

73,
Don W3FPR

On 12/16/2021 4:34 PM, Pete Smith N4ZR wrote:

I've been wondering for some time if my 10-year-old K3's frequency
calibration was off, because it seemed like most spots of me were well
off when I clicked on them, usually in one direction.? Not having a
frequency counter, I went to the alternative method outlined in page
49 of the manual.? I thought I did it all "by the book", but found
that when I was done 15-MHz WWV's carrier frequency (determined by
zero-beating the carrier) was almost 400 Hz low. Since I wasn't
looking for FMT-level accuracy, I went back to WWV and adjusted the
REF CAL setting by ear until 15.000 on my RX dial was as close to
zero-beat with WWV as I could tell. We'll see how it worked out, but I
wonder if I simply have some fundamental misunderstanding of what's
involved.? Wouldn't be the first time...



--

Message: 5
Date: Thu, 16 Dec 2021 17:01:50 -0700
From: David Hachadorian
To: Pete Smith N4ZR, Reflector Elecraft

Subject: Re: [Elecraft] K3 Frequency Calibration
Message-ID:<6453871f-7e7d-fa93-8a79-7b1efd5e4...@gmail.com>
Content-Type: text/plain; charset=UTF-8; format=flowed

You had it fixed, but then you broke it again. After doing the
alternative method on page 49, when you tune in to 10. MHz in CW
mode, you should hear a CW note at the same frequency as your PITCH
selection.? I presume that is 400 Hz.

I got an extremely good score on last year's Frequency Measuring Test
using only that alternative calibration method.

73

Dave Hachadorian, K6LL
Yuma, AZ



--

Message: 6
Date: Thu, 16 Dec 2021 23:04:36 -0800
From: Ray
To: Wes,   "elecraft@mailman.qth.net"

Subject: Re: [Elecraft] K3 Frequency Calibration
Message-ID:<61bc3686.1c69fb81.f8fd0.8...@mx.google.com>
Content-Type: text/plain; charset="utf-8"

Gents
Go to a WWV signal, (5.00)  on a Good Strong Frequency.
Place the Mode To Upper SSB, Listen to the Beat note Tone Freq,
Now Move the Mode to Lower SSB. Adjust the  Ref. Cal. Osc. until the Beat Note 
is the Exact Same Freq
On Lower SSB and Upper SSB.   Done
Ray WA6VAB  K3





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[Elecraft] K3 Noise Reduction

[Bob McGraw]

The approach I use for the Noise Blanker is this.

I first activate the NB and then the Level.   I start with the DSP OFF 
and the IF OFF.  I then adjust the DSP value for optimum results without 
it destroying the quality of the signal.  DO MAKE A NOTE OF THIS VALUE.  
Then set the DSP back to OFF.  Then move to the IF and scroll through 
the settings in an effort to find optimum results.  Once this is done, 
leave the IF value as determined and return to the DSP and set it to the 
value previously determined.


This works for a given band and given type of noise.  Change bands or 
noise and do it all again.  There is no ONE setting correct for every 
condition.   Right now my 6M noise buzz is S-7 with the NB off.  Then 
turning it ON and adjusted as above the 6M noise is S-3.  That's 4 S 
units or 24 dB improvement.  I doubt you will get much better than this.


As to Noise Reduction, I find it best performs for CW mode. Again it 
takes careful adjustment to obtain optimum results.   I don't use NR for 
SSB signals. I prefer to adjust the Attenuation value and the RF Gain to 
produce optimum results when operating SSB.   I find optimum results 
occur when the no signal band noise is about 10 dB above the receiver 
noise floor.   In order to accomplish this operating point, one will 
need to use ATTENUATION and RF Gain reduction.   More gain won't aid in 
receiving weak signals, but just the opposite, as the signal will pop 
out of the noise.


I generally find using either NB or NR, but not both, is the better way 
to operate.  I doubt there is anything wrong with your radio.  Most 
likely the result is more related to receiver setting parameters.


73

Bob, K4TAX


On 12/15/2021 9:46 AM, elecraft-requ...@mailman.qth.net wrote:

Message: 15
Date: Wed, 15 Dec 2021 09:36:26 -0500
From: Pete Smith N4ZR
To: Elecraft List
Subject: [Elecraft] K3 Noise Reduction
Message-ID:
Content-Type: text/plain; charset=UTF-8; format=flowed

Last weekend during the 10 meter contest I was experiencing very loud
line-noise-like interference when my antenna was pointing south.? I
tried both my K3's Noise Reduction and Noise Blanker functions, and was
unable to find any setting that gave useful relief.? With the noise
blanker, in particular, I noticed that when it was on, not only was the
buzz still very strong, but it seemed as if all CW signals on the band
were being hum-modulated.? As soon as I turned off the noise blanker,
the CW signals cleaned up.? Is there something wrong with my radio, or
an adjustment issue, or is this interference simply too strong??
Obviously, I'll be trying to track it down, but it's not there all the
time, so that could be tough.

-- 73, Pete N4ZR Check out the new Reverse Beacon Network web server 
at . For spots, please use your 
favorite "retail" DX cluster. -- Message: 
16 Date: Wed, 15 Dec 2021 06:55:25 -0800 From: Dave  
To: elecraft@mailman.qth.net Subject: Re: [Elecraft] K3 Noise 
Reduction Message-ID:  
Content-Type: text/plain; charset=utf-8; format=flowed I have that 
same issue... I have some very dirty grow lights about two blocks from 
me. They are dirty as they come... Splattering across 80-20 meters. 
The K3 has never been able to adequately clean up the crud from them. 
In defense of the NB/NR on the K3, the signals are on the order of S7 
to S9, so my expectations may be too high for the K3. I just hope the 
K4 NB/NR work better in my environment. 73, and thanks, Dave (NK7Z) 
https://www.nk7z.net ARRL Volunteer Examiner ARRL Technical 
Specialist, RFI ARRL Asst. Director, NW Division, Technical Resources 
--

Message: 17
Date: Wed, 15 Dec 2021 08:05:59 -0700
From: David Hachadorian
To: Pete Smith N4ZR, Reflector Elecraft

Subject: Re: [Elecraft] K3 Noise Reduction
Message-ID:
Content-Type: text/plain; charset=UTF-8; format=flowed

For 12 years I've tried to get any enhancement of s/n from the K3 IF/RF
NB and NR.? I haven't seen one case where there is any improvement under
contest conditions.? When the s/n just starts to improve, the desired
signal is modulated and degraded by nearby signals to the point where
reception is better with NB/NR turned off.? As far as I can see, both of
these features are useless on the K3 under contest conditions.

Dave Hachadorian, K6LL
Yuma, AZ





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[Elecraft] KAT500 Attenuator

[Bob McGraw]

Just went through different antenna configurations and bands. Using the 
KAT500 Utility, selecting the ATTENUATOR and then TUNE on my K3S shows a 
SWR of 1.5:1 and when the ATTENUATOR is not selected the SWR shows 
1.1:1.   An external SWR/PWR meter in the line between the radio and 
KAT500 shows the same values.


In receive mode, I hear a relay click when selecting the ATTENUATOR and 
again when de-selecting the ATTENUATOR.  Also noted the RX signal drop 
about ~3 dB {maybe less} when the ATTENUATOR is selected.


I did notice initially when selecting the ATTENUATOR it seemed to be 
inconsistent in results for a few times.  I figure this is some issue 
with relay contacts.   Once exercised 3 or 4 times,  no further strange 
operation was observed.


Don't have a clue if the resistors in question are installed or not.

I recall that certain ICOM tuners insert an attenuator on the input when 
running the tune routine.  This is said to provide a constant 
impedance/load to the transmitter while the tuner runs through its range 
of L and C values.   This of course is for a radio that folds back power 
when the SWR is >3:1 or so.


73

Bob, K4TAX

On 12/12/2021 7:24 PM, elecraft-requ...@mailman.qth.net wrote:

Message: 4
Date: Fri, 10 Dec 2021 13:30:16 +
From: Andy Durbin
To:"elecraft@mailman.qth.net"  
Subject: [Elecraft] KAT500 Attenuator
Message-ID:



Content-Type: text/plain; charset="iso-8859-1"

KAT500 has an input attenuator that may, under certain conditions, be activated 
during a full search tune.   Page 1 rev C of the KAT500 schematic shows the 
attenuator is a divider consisting of R6 and R7 which are both 39 ohm.  My 
KAT500 serial number 2609 does not have R7 fitted and R7 is shown as not 
populated in Figure 17 of KAT500 User's Manual Rev C6.

The removal of R7 changes the potential divider into a simple series resistor 
and my measurements show my KAT500 presents a very poor match to my TS-590 
exciter when the attenuator is active.  In this example the KAT500 was in 
bypass and connected to a nominal 50 ohm dummy load.  The impedance presented 
to my TS-590 by KAT500 was measured with an LP-100A:

Att Out:  R 48.1, X 2.4, Pwr 4.48, SWR 1.06
Att In:  R 22.3, X 162.6, Pwr 0.55,  SWR 9.98

Do other KAT500 owners see similar results? (Attenuator can be switched in/out 
with KAT500 utility)

Can someone please explain why the attenuator was changed.

Thanks and 73,
Andy k3wyc


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