[Elecraft] KPA 1500 #106

[James F. Boehner MD via Elecraft]

Someone mentioned that new KPA 1500 owners were not posting to the list.

KPA-1500 Serial 106 was received today, installed and on the air!  Purchased
25-Aug-2017 12:54:30 PDT by phone.

Yes, it is as awesome as we have been told.  Thank you, Elecraft!

One question-the status of the KPA 1500 is listed on the K3 screen as KPA
500.  Is there a way to change that now, or will that be in another K3
firmware release?

'73 de JIM N2ZZ


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Re: [Elecraft] PX3 computer interface to KX3

[John_N1JM]

Is the *host serial port baud rate* set correctly in the PX3?

John N1JM


Bill Frantz wrote
> I'm sitting in New Hampshire and I find I can't get my computer 
> to talk to the KX3 when it goes through the PX3 using the 
> ACC1-PC jack. The computer can talk to the KX3 when plugged in 
> directly to ACC1 jack on the KX3, and the PX3 can get the 
> frequency data when plugged into the same jack.
> 
> I have the same problem with both wsjt-x and RUMlogNG, so I 
> don't think the problem is in the computer software. The USB 
> <--> RS232 seems to be working, so I suspect the PX3.
> 
> Does anyone have any suggestions for something to fix to get 
> both the computer and the PX3 to talk to the KX3? (I'm low on 
> test equipment here, but I do have a DVM.)
> 
> Thanks - Bill AE6JV
> 
> ---
> Bill Frantz| Concurrency is hard. 12 out  | Periwinkle
> (408)356-8506  | 10 programmers get it wrong. | 16345 
> Englewood Ave
> www.pwpconsult.com |- Jeff Frantz | Los Gatos, 
> CA 95032
> 
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> lists+1215531472858-365791@.nabble





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[Elecraft] Samuel Morse's birthday (Friday, April 27th); good excuse to break out your old hand keys

[Geoff Clark]

Thanks for the reminder Wayne, it's also the anniversary of the day I took
my CW test!

I got home from work and called CQ on 20m, lit up RBNs all over the USA but
only one caller -  K7KV, thanks for the CW QSO on Samuel's birthday!
Everyone else must be busy on FT8 :-(
73
Geoff ZL3GA
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[Elecraft] KPA3 removal

[Martin Sole]

Hi,

I am about to start replacement of the LPA output devices. To do so I 
think I first need to remove the KPA3. Once done can I just operate the 
K3 at low power to prove the LPA? I don;t have the jumper block so would 
just leave the interface block in place. I'm assuming it does much the 
same thing at low power .


Is there a procedure of any sort I can follow?
What bias current should I set R18 and R19 for?

Thanks
Martin, HS0ZED

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Re: [Elecraft] Current Flow on Copper Strips - a Question

[Wes Stewart]

"When skin effect is present, the current is always redistributed over the 
conductor cross section in such a way as to make most of the current flow where 
it is encircled by the smallest number of flux lines.  This general principle 
controls the distribution of current irrespective of the shape of the conductor 
involved. Thus, with a flat strip conductor (figure reference not shown) the 
current flows primarily along the edges, where it is surrounded by the smallest 
amount of flux, and the true or effective resistance will be high because most 
of the strip carries very little current.  (A reference to the missing figure) 
makes clear that it is not the amount of conductor surface that determines the 
resistance to alternating current but rather the way in which the conductor 
material is arranged."



On 4/26/2018 6:35 PM, Dauer, Edward wrote:

 Since I don't know what precedes the word "thus" in the quotation below I 
would ask if someone could explain this phenomenon for me.

I am trying to visualize this with a thought experiment.  In an earlier post 
someone (Skip?) mentioned that early transmission lines were sometimes hollow 
copper tubes, to respect the fact that AC flows only on the outside of a 
conductor.  So, imagine a hollow tube carrying RF (which may approximate the 
fast rise and fall times of a high voltage strike).  Current is flowing all 
over the surface, I gather.  Now squeeze the tube along its length so that a 
cross section becomes an ever flatter ellipse.  At the last instant squeeze it 
so that the sides are in contact with each other.  What happens to the current 
flow as that squeezing occurs?  Is it still all around the squished tube until 
the instant the two sides join?  And then it all flows primarily along the 
edges of the now flat conductor?  Howcome?

Tnx,

Ted, KN1CBR
 
 
 --
 
 Message: 3

 Date: Wed, 25 Apr 2018 18:45:39 -0700
 From: Wes Stewart 
 To: elecraft@mailman.qth.net
 Subject: Re: [Elecraft] OT: Grounding Question
 Message-ID: 
 Content-Type: text/plain; charset=utf-8; format=flowed
 
 Radio Engineering and Radio Engineer's Handbook are two different critters.? My

 copy of Radio Engineering is the third edition and the pertinent 
information is
 on p.20.
 
 To partially quote: "Thus, with a flat-strip conductor, the current flows

 primarily along the edges."
 
  


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Re: [Elecraft] K3 AR0 & AR1 commands not working

[Wayne Burdick]

I’m assuming you do have a KXV3 installed?

Make sure you’re not in BSET or VFO A/B REVerse when you send the command. 

Also try sending just “AR;” in the command tester and see if you get a 
response. If you don’t, then you must have older firmware without the command 
implemented.

73,
Wayne
N6KR


> On Apr 26, 2018, at 6:29 PM, Rich - K1HTV  wrote:
> 
> I have been unsuccessful in being able to control the K3 "RX ANT" using 
> macros with either the AR1 (on) or AR0 (off) commands. Manually tapping the 
> 'RX ANT' button on the K3 will correctly toggle the K3 receiver between the 
> MAIN and RX ANT (Beverage) antennas.
> 
> 
> Using the latest version of the K3 Utility I verified that the K3 has the 
> latest version of firmware and that it responded to a number of commands, but 
> it would NOT respond to either the 'AR0' or 'AR1' commands. The K3 is SN 3657 
> with sync and the KIO3 USB upgrades.
> 
> 
> Thinking that there may be an EEPROM corruption problem I did an EEINT 
> factory reset. After changing the CONFIG 'RS232' setting back to 'USB' so the 
> K3 Utility could communicate again with the K3, I reloaded the last backup of 
> the configuration settings. I still could not get the AR0 or AR1 commands to 
> switch the RX ANT on the K3.
> 
> 
> Any suggestions as to how to get the 'AR0' and 'AR1' commands to work so I 
> can use them in a macro? Could I have a bad EEPROM?
> 
> 
> 73,
> Rich - K1HTV
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[Elecraft] Second speaker just turns off K3S

[Dave Kelley]

My K3S has two receivers and is up to date on firmware.  I have a pair of the 
Elecraft speakers on it.

I haven’t found any particular pattern to when it does this, but every once in 
a  while the second speaker just cuts out and when I look at the menu selection 
it says 1 SPKR.  I change it back to 2 and it pops back on.

I can be operating or sitting across the room and it might do it every other 
day or so.  I do have the second receiver and often I’m listening with 
Diversity turned on.  I can’t remember it ever doing it when i was listening to 
two frequencies on each receiver.

It’s probably something I’m doing wrong, so I thought I’d ask you guys before 
hitting up support.

73

Dave, AI7R
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[Elecraft] Current Flow on Copper Strips - a Question

[Dauer, Edward]

Since I don't know what precedes the word "thus" in the quotation below I 
would ask if someone could explain this phenomenon for me.

I am trying to visualize this with a thought experiment.  In an earlier post 
someone (Skip?) mentioned that early transmission lines were sometimes hollow 
copper tubes, to respect the fact that AC flows only on the outside of a 
conductor.  So, imagine a hollow tube carrying RF (which may approximate the 
fast rise and fall times of a high voltage strike).  Current is flowing all 
over the surface, I gather.  Now squeeze the tube along its length so that a 
cross section becomes an ever flatter ellipse.  At the last instant squeeze it 
so that the sides are in contact with each other.  What happens to the current 
flow as that squeezing occurs?  Is it still all around the squished tube until 
the instant the two sides join?  And then it all flows primarily along the 
edges of the now flat conductor?  Howcome?

Tnx, 

Ted, KN1CBR


--

Message: 3
Date: Wed, 25 Apr 2018 18:45:39 -0700
From: Wes Stewart 
To: elecraft@mailman.qth.net
Subject: Re: [Elecraft] OT: Grounding Question
Message-ID: 
Content-Type: text/plain; charset=utf-8; format=flowed

Radio Engineering and Radio Engineer's Handbook are two different 
critters.? My 
copy of Radio Engineering is the third edition and the pertinent 
information is 
on p.20.

To partially quote: "Thus, with a flat-strip conductor, the current flows 
primarily along the edges."

 

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[Elecraft] K3 AR0 & AR1 commands not working

[Rich - K1HTV]

I have been unsuccessful in being able to control the K3 "RX ANT" using macros 
with either the AR1 (on) or AR0 (off) commands. Manually tapping the 'RX ANT' 
button on the K3 will correctly toggle the K3 receiver between the MAIN and RX 
ANT (Beverage) antennas.


Using the latest version of the K3 Utility I verified that the K3 has the 
latest version of firmware and that it responded to a number of commands, but 
it would NOT respond to either the 'AR0' or 'AR1' commands. The K3 is SN 3657 
with sync and the KIO3 USB upgrades.


Thinking that there may be an EEPROM corruption problem I did an EEINT factory 
reset. After changing the CONFIG 'RS232' setting back to 'USB' so the K3 
Utility could communicate again with the K3, I reloaded the last backup of the 
configuration settings. I still could not get the AR0 or AR1 commands to switch 
the RX ANT on the K3.


Any suggestions as to how to get the 'AR0' and 'AR1' commands to work so I can 
use them in a macro? Could I have a bad EEPROM?


73,
Rich - K1HTV
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[Elecraft] Odd problem

[Steve]

I have K3 s/n 3400 plus which I’ve owned since. I have come across an odd 
problem. Occasionally when tuning across any band, the display suddenly jumps 
from 14023 to a frequency in the 80-100 MHz area. The only way to fix it is to 
turn the radio off and then back on. Of course, it is an intermittent 
condition. Doesn’t happen all the time. Any ideas?
73
Steve AA4V

Sent from my I-Phone
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[Elecraft] PX3 computer interface to KX3

[Bill Frantz]

I'm sitting in New Hampshire and I find I can't get my computer 
to talk to the KX3 when it goes through the PX3 using the 
ACC1-PC jack. The computer can talk to the KX3 when plugged in 
directly to ACC1 jack on the KX3, and the PX3 can get the 
frequency data when plugged into the same jack.


I have the same problem with both wsjt-x and RUMlogNG, so I 
don't think the problem is in the computer software. The USB 
<--> RS232 seems to be working, so I suspect the PX3.


Does anyone have any suggestions for something to fix to get 
both the computer and the PX3 to talk to the KX3? (I'm low on 
test equipment here, but I do have a DVM.)


Thanks - Bill AE6JV

---
Bill Frantz| Concurrency is hard. 12 out  | Periwinkle
(408)356-8506  | 10 programmers get it wrong. | 16345 
Englewood Ave
www.pwpconsult.com |- Jeff Frantz | Los Gatos, 
CA 95032


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Re: [Elecraft] K3 macro question

[Bill]

Don,

Thanks - never saw it for all the other trees in the forest. It is now 
one of the buttons on my Genovation. It is a great controller for the K3 
- couple it with the K-Pod and ..  Well, there is nothing 
else available out there that can compare with this K3/control combo - 
and it is perfect for me.


Bill W2BLC K-Line

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Re: [Elecraft] CW AGC settings

[Fred Jensen]

I *always* have AGC on.  To each his own.  Don has an excellent and 
enlightening AGC dissertation at www.w3fpr.com which is worth reading.  
See "Noisy K3."  You asked for settings, mine are:


THR=10
SLP=14
PLS=nor
HLD=0.1
DCY=nor
Fast=120
Slow=20

I operate mainly CW although I do listen to SSB a little and do a little 
general coverage SWL listening.  I run fast AGC on CW, usually slow on 
SSB.  Your threshold setting will depend somewhat on your ambient noise 
level.  Slope seems to be a personal preference.  I like to hear a 
difference between signals of different strength.


Before we moved, I was surrounded by electric fences [some mine] which 
always started arcing in the spring when the weeds grew up on the fence 
line.  The noise blanker would take the pulses out, PLS=nor prevented 
them from activating the AGC.  I think DCY is personal preference, nor 
seems to work best for my compromised hearing.  Hope this helps ... and 
actually answers your questions?


73,

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

On 4/26/2018 12:01 PM, Bill Stravinsky via Elecraft wrote:

  I never use AGC on cw, only on ssb (and that ain't too often, hi)

Bill
K3WJV

 On Thursday, April 26, 2018, 1:17:25 PM EDT, Leroy Buller 
 wrote:
  
  Hello all.  Long time posting here.  I am interested in CW AGC settings you

like on your K3.  I have been fooling around with the settings and wonder
what others like.  I am interested in CW contest settings.

Lee K0WA



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Re: [Elecraft] CW AGC settings

[Don Wilhelm]

Thank you Mike for mentioning that article.

Yes, adjusting your AGC Threshold and Slope is preferable to running 
with AGC off.


Fortunately, the K3/K3S has an adjustable limiter to help protect the 
ears for those operators who would still choose to run with AGC off.


73,
Don W3FPR

On 4/26/2018 4:44 PM, Mike K8CN wrote:

Don, W3FPR wrote a succinct tutorial about AGC settings on his web page
www.w3fpr.com under the title "Noisy" K3.  I had left my AGC settings for CW
contesting at the default values until reading Don's guidance, and once I
reset the AGC threshold and slope parameters I had much better CW contesting
experiences.

Mike, K8CN



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Re: [Elecraft] CW AGC settings

[Mike K8CN]

Don, W3FPR wrote a succinct tutorial about AGC settings on his web page
www.w3fpr.com under the title "Noisy" K3.  I had left my AGC settings for CW
contesting at the default values until reading Don's guidance, and once I
reset the AGC threshold and slope parameters I had much better CW contesting
experiences.

Mike, K8CN



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Re: [Elecraft] CW AGC settings

[Victor Rosenthal 4X6GP]

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Re: [Elecraft] CW AGC settings

[Bill Stravinsky via Elecraft]

 I never use AGC on cw, only on ssb (and that ain't too often, hi)

Bill
K3WJV

On Thursday, April 26, 2018, 1:17:25 PM EDT, Leroy Buller 
 wrote:  
 
 Hello all.  Long time posting here.  I am interested in CW AGC settings you
like on your K3.  I have been fooling around with the settings and wonder
what others like.  I am interested in CW contest settings.

Lee K0WA
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Re: [Elecraft] OT: Grounding Question

[Jim Brown]

Thanks for this reference.  K6STI sent me a comparable paper from NASA. 
Note that the graph (which came direct but not on the reflector) is for 
the radiated field, not the energy in the strike itself. My reference 
for lightning spectrum is for the energy in a strike, and is from IEEE 
Standards for power and grounding, which are published as "The Emerald 
Book" and "The Green Book."  It's been at least ten years since I read 
it, and I don't recall in which book it is stated.


73, Jim K9YC

On 4/25/2018 5:17 PM, Jef Allbright wrote:
On Wed, Apr 25, 2018 at 4:17 PM, Jim Brown>wrote:


On 4/25/2018 1:59 PM, Jef Allbright wrote:

The vast majority of the energy in a lightning strike is well
below 1 MHz

WRONG! Lightning is a VERY short rise-time impulse, so it is an RF
event, not a DC event.



Jim -

The energy from a lightning strike typically can be detected up to 
about 20 MHz but as you can see from Willett, 1990, the energy curve 
diminishes and /*is already down about -25dB before it reaches 1 
MHz*/. So the bulk of the energy is released well below 1 MHz.  To 
provide equivalent energy above 1 MHz, you'd have to imagine the graph 
somehow suddenly leveling off and then continuing at that amplitude 
(25dB down) for nearly 500 MHz to provide a similar integral area.


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[Elecraft] CW AGC settings

[Leroy Buller]

Hello all.  Long time posting here.  I am interested in CW AGC settings you
like on your K3.  I have been fooling around with the settings and wonder
what others like.  I am interested in CW contest settings.

Lee K0WA
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[Elecraft] VHF PA and HF PA on the same K3 - how to?

[Kjeld Holm]

Dear Elecrafters,

I am about to run my K3 with INTERNAL 144 MHz transverter with two external
PAs for HF and VHF respectively. 

For now I am using the KEY OUT connector for the keying of the HF PA. 

How can I get a key out signal for my coming VHF PA? 

To the best of my knowledge the two amplifiers have different voltages on
the connection. So I believe I cannot just use an Y-splitter. 

I see on page 19 in the manual for K3:
For transverter keying, you can use KEYOUT-LP
signal (pin 10 of the ACC connector) or the KEY
OUT jack (RCA).

But how about the potential and other details on this connector? 

To the best of my knowledge my coming VHF PA has 5V on the center pin of its
key in connector. 

Vy 73 de OZ1CCM, Kjeld

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Re: [Elecraft] VHF PA and HF PA on the same K3 - how to?

[Kjeld Holm]

Dear Elecrafters,

I am about to run my K3 with INTERNAL 144 MHz transverter with two external
PAs for HF and VHF respectively. 

For now I am using the KEY OUT connector for the keying of the HF PA. 

How can I get a key out signal for my coming VHF PA? 

To the best of my knowledge the two amplifiers have different voltages on
the connection. So I believe I cannot just use an Y-splitter. 

I see on page 19 in the manual for K3:
For transverter keying, you can use KEYOUT-LP
signal (pin 10 of the ACC connector) or the KEY
OUT jack (RCA).

But how about the potential and other details on this connector? 

To the best of my knowledge my coming VHF PA has 5V on the center pin of its
key in connector. 

Vy 73 de OZ1CCM, Kjeld

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[Elecraft] K3 for sale

[Thaire Bryant]

I am listing for sale my loaded K3/100-F.

Inc: KA3-F, KFL3A-2.8(2), KXV3, KTCXO3-1, KBPF3,KFL3A-6K(2), KFL3-FM(2),
KFL3A-400(2), KRX3, KDVR3, K144RFLK, K3DSPUPGD-F, K3TFNR-F, K312VMDKT-F,
KXV3A-UPGD-F,K144XV-100-K

Firmware:5.60  Elecraft factory upgrades

Pictures on request.

Asking $2,500 plus shipping and ins.

 

Thaire  W2APF

 

H: 603-447-2376

C: 508-245-3522

Skype: camp.comfort

 

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[Elecraft] K3S Mod For RF Sample Insertation

[Palmer Byrne]

Is there any way that a simple mod can be made to allow for insertion of 
an rf sample from a 1.5 kw pa  as is done in the ANAN100D transceiver?


73 palmer


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Re: [Elecraft] K3 macro question

[Don Wilhelm]

Bill,

What is wrong with using SWT26; to "operate" the ANT switch from a 
macro?  That should toggle the antenna selection.


Perhaps I misunderstood your request.

73,
Don W3FPR

On 4/26/2018 9:07 AM, Bill wrote:
I currently use AN1; and AN2; to select between the two antenna inputs 
on the K3 - this requires two switches be assigned to toggle between 
antennas. Push button selection.


However, on the K3, only a single switch ANT on the rig to toggle 
between the antennas. Toggle selection.


Is there a macro or assignable command to toggle from a single key?

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[Elecraft] K3 macro question

[Bill]

I currently use AN1; and AN2; to select between the two antenna inputs 
on the K3 - this requires two switches be assigned to toggle between 
antennas. Push button selection.


However, on the K3, only a single switch ANT on the rig to toggle 
between the antennas. Toggle selection.


Is there a macro or assignable command to toggle from a single key?

Thanks,

Bill W2BLC K-Line

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Re: [Elecraft] Reminder: Most Elecraft rigs can scan "dead" bands for signals

[Drew AF2Z]

I wrote a macro that will scan the range between the VFO-A freq and the 
VFO-B freq. Just dial in the freqs and hit the macro key. A short push 
will scan muted; a long push will scan unmuted. A manually paused scan 
can be resumed by hitting the SCAN key. Named "SCANNOW" in the 
Programmer's Reference PDF.


Regarding scan, I wish...

- scan rate could be variably adjusted during scan; the current COARSE 
is often too fast and the FINE is too slow;


- could set a fixed dwell time; the current dwell time is random.

73,
Drew
AF2z




On 04/25/18 23:46, Wayne Burdick wrote:

Those of you who are new users of an Elecraft K2, K3/K3S, KX2, or KX3 may not 
know about the scanning and channel-hoping feature that’s common to all of 
these rigs. Scanning a seemingly “dead” band segment can reveal signals as they 
come up, allowing you to do other things (work out, paint, dust, reread 
“Ecotopia” by Ernest Callenbach, brew an IPA, whatever).

You might think of scanning as an eyes-free panadapter. Well, I do.

The basic scanning mode keeps the receiver muted until signals appear. It’s a 
real ear-saver. In addition, the K2, K3/K3S, and KX3 have a “live scan” feature 
that simply scans continuously with the receiver audio unmuted. This is 
especially useful on bands where very weak signals might appear from nowhere 
out of low-level atmospheric noise, say 15 meters.

All of these radios also support hopping among a set of labeled memories. This 
is typically used on 60 meters or other channelized bands, e.g. those with 
repeater allocations.

For details, see “Scanning” in your owner’s manual's table of contents.

Tips:

- If you’re scanning for CW signals, perhaps this coming Friday in honor of 
Morse’s birthday (hint), set the bandwidth very narrow (50-200 Hz).

- If there’s a lot of band noise, turn off the preamp. This will give the 
scanning algorithm more audio dynamic range to work with.

- Scanning steps match those set up for the VFO knob; using fine steps will 
miss fewer signals but take longer to scan the segment of interest.

- Configure all of the above *before* saving setups to memory as scan 
start/stop end points (VFO A and B). Later, you can recall your favorite scan 
ranges preconfigured for various band conditions.

73,
Wayne
N6KR





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Re: [Elecraft] KX2 recommended power supply

[Raymond Sills]

That's a good unit.  I have one, and recommend it.  It's small enough to fit in 
my LowePro Edit 140 bag, along with my KX3, the mic, paddle and wire for an 
antenna.


73 de Ray
K2ULR
KX3 #211




-Original Message-
From: W0FK 
To: elecraft 
Sent: Wed, Apr 25, 2018 10:13 pm
Subject: Re: [Elecraft] KX2 recommended power supply

I like the ProAudio Engineering Kx33. Works quite well with my KX2 and KX3.

https://proaudioeng.com/products/pae-kx33-low-rfi-ac-power-supply/  

Lou, W0FK





-
St. Louis, MO

"The difference between stupidity and genius is that 
genius has its limits." Albert Einstein


--
Sent from: http://elecraft.365791.n2.nabble.com/
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Re: [Elecraft] FAR OT: Grounding and lightning

[Jim Brown]

On 4/25/2018 10:15 PM, David Gilbert wrote:
It does not advance the technical competency level of our hobby to 
make broad generalizations based upon narrow and poorly defined 
anecdotal instances.


Strongly agree.

73, Jim K9YC

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