Re: [Elecraft] Power spike early K3

[N2TK via Elecraft]

I had the same problem with the K3/KPA1500 combination. I recalibrated the K3. 
Then I made sure I don't run the K3 at exactly 5W or 50W. The problem has not 
reappeared.N2TK, Tony


-Original Message-
From: Mikael Larsmark 
To: elecraft@mailman.qth.net
Sent: Sat, May 20, 2023 3:45 am
Subject: [Elecraft] Power spike early K3

Hi,

We have an early serial K3 which has got an issue with power spikes. I have
done a TX gain calibration without it making a difference. The spike
happens mainly when you have changed to a new band and during the first
transmission. After that the spike is a lot smaller and not much of an
issue.

Anybody have any ideas of what this could be because of? It kind of makes
it impossible to run a solid state amplifier on the radio and probably not
good for the tube amplifiers either.

/Mike, SJ2W
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Re: [Elecraft] Complements to Elecraft Service

[N2TK via Elecraft]

Yep, service is still good. I sent out one of my K3's for a going over to make 
sure it met factory standards and was up to date with mods before I sell it 
since I now have a K4D. Priority mailed it on 5/18. Got an email yesterday with 
the report and invoice that it is ready to ship back.
Fast service!N2TK, Tony 


-Original Message-
From: Dave (NK7Z) 
To: elecraft@mailman.qth.net 
Sent: Wed, Jun 1, 2022 7:12 pm
Subject: [Elecraft] Complements to Elecraft Service

Hi,
It looks like Elecraft service is ticking along well...  I sent in a P3 
for some minor work, about 3 weeks ago, and just got the bill and 
shipping note from them.  So the repair took 3 weeks!  Glad to see this!
-- 
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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Re: [Elecraft] Elecraft Service

[N2TK via Elecraft]

One of these days I will have the time to open up the box with the K4D to at 
least see what serial number. Just been too busy.I have a pair of K3's, serial 
#311 and 1435 that have been updated to as far as you can go to make them K3S'. 
I want to sell one of the K3's. Even though they both work fine, I wanted to 
send the one I want to sell to Elecraft for a general check up before I sell it 
to make sure everything is fine. I submitted an RMA. Got a call from Elecraft 
support saying that for a general checkup the K3 may be sitting there for quite 
a while. That was nice of them to let me know so that the K3 just didn't set 
there for who knows how long. So, will let it sit here till they can check it 
out. I can wait.N2TK, Tony 


-Original Message-
From: Jim Stockwell 
To: elecraft@mailman.qth.net 
Sent: Fri, Apr 22, 2022 1:23 am
Subject: [Elecraft] Elecraft Service

I also have a K3S in need of service.  I submitted an Elecraft support request 
on February 7, 2022 and was told that I was #11 on the wait list.  After 
waiting 6 weeks, I send another email to Elecraft support to see if I had moved 
up on the list.  At that time I was told "While you're # 11 on the waitlist, #1 
is also waiting."  I also have a K4 on order from December, 2021 , but it's not 
looking like I'll have a repaired K3s or a new K4 anytime soon.  Still waiting.

Jim W6KC

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Re: [Elecraft] K3 strange overshoot

[N2TK via Elecraft]

I got way behind with my personal email so not sure if there has been follow-up 
to this.
I have a K3/KPA1500. A final in the KPA1500 blew and took out the K3 too. Both 
went back to Elecraft for repair. This was the third trip back for the 
KPA1500.I was told the log showed over drive on the amp. This was very puzzling 
as I never drove the amp hard, at least not to my knowledge. I was concerned 
about using it. Thought about selling it as it was fresh back from the factory 
again and checked out. But not sure if there was an inherent problem with the 
amp so didn't want to pass this on to someone else. When it came back I left it 
in the box for quite a while. Used the KPA500 instead. Finally set it up for 
ARRLDXCW. But kept my drive at <20W. My amps are in the basement on a shelf 
literary right below my feet where I sit to operate. My left monitor is off 
about 45 degrees. This is where I have a window for the KPA1500 Remote screen 
window. What I noticed, even with <20W drive, when I changed any bands, the 
first key shot the power way up. After the first keying the power dropped down 
to what you would expect. Any keying after that would be fine until I changed 
bands. Maybe this is why the KPA1500 finals died?
I was told this is caused by the K3. If you set the K3 to exactly 5 or 50W the 
calibration will change and cause this spike. Someone told me to do a 
recalibrate on the K3 (sorry I don't remember who told me to do that? This K3 
had come back from Elecraft along with the KPA1500.I did that and guess what, 
the spike on the KPA1500 went away even when changing bands. Since I did this I 
make sure the K3 is never set up for either 5 or 50w. Everything worked fine 
all weekend, but with reduced power. I was eagle eye when changing bands and so 
far have not seen the problem come back.
Is this K3 issue about the problem happening if you set up and transmit with 
the K3 at 5W or 50W for real? Is it widespread? I have to assume Elecraft isn't 
aware of this, if it is a real problem. I got to assume they would have sent 
out a notice or a possible software upgrade to fix this.
Bob, no idea if this is the overshoot problem you are seeing. 
By the way, what drive power are folks using to get 1500W out of the 
KPA1500?Also, I don't believe the SWR has had any involvement with this 
problem. All my antennas SWR are below <1.5.
73,N2TK, Tony


-Original Message-
From: Jim Brown 
To: elecraft@mailman.qth.net
Sent: Fri, Feb 11, 2022 5:34 pm
Subject: Re: [Elecraft] K3 strange overshoot

On 2/11/2022 2:06 PM, Bob McGraw wrote:
> I see a small initial overshoot when changing bands. Drive power for 
> each band is different.

Same here. I think it's the K3, and I think it's normal.

73, Jim K9YC
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Re: [Elecraft] KPA1500 wattmeter adjustment

[N2TK via Elecraft]

Hi Mark,N8LP sent me a note concerning the calibration of the LP100 at high 
frequencies. I use the LP-100 as a reference. I just packed up the LP100, 
cables and head to ship to Larry tomorrow. I have had it for a long time. Who 
knows? I may have done something dumb with it. 3-5% is fine in my book.
73,N2TK, Tony


-Original Message-
From: Mark Goldberg 
To: Bob McGraw 
Cc: Elecraft Mailing List 
Sent: Sun, Feb 6, 2022 1:47 pm
Subject: Re: [Elecraft] KPA1500 wattmeter adjustment

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
> > 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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Re: [Elecraft] KPA1500 wattmeter adjustment

[N2TK via Elecraft]

Dick,Thanks for the tip. My KPA1500 is in the basement on a shelf right under 
my feet in the shack. I use Remote By Elecraft in the shack to monitor the 
amp.Took your tip and used the KPA1500 Utility > Operate to get to WMTR Adjust. 
This made it very easy to make changes and see the results right away.I used 
the LP-100 as the standard. But the readout does seem to drop off some (15% 
lower on 6M compared to 160M) as I go higher in frequency compared to the K3 
showing 100W. Is it the LP-100 or the K3? Not sure at this stage if I should 
bother with anything else On the P3 I set the SensorScale to 474.On the KPA1500 
The WMTR depended on the band. The range was from 92-99%.  The largest readout 
spread comparing the LP-100, P3 and KPA1500 is now  <6% with most bands 
<3%.This is as accurate as I need to be. I am now a happy camper.I assume I 
can't attach a spreadsheet. So if anyone wants a copy of my results let me 
know.73N2TK, Tony


-Original Message-
From: Dick Dievendorff 
To: tony@verizon.net
Cc: elecraft@mailman.qth.net
Sent: Sat, Feb 5, 2022 3:11 pm
Subject: Re: [Elecraft] KPA1500 wattmeter adjustment

If you turn in the Tech Mode menu item, there is a WMTR ADJUST menu item that 
might be easier to use than the command tester commands. 

73 de Dick, K6KR

> On Feb 5, 2022, at 10:33, N2TK via Elecraft  wrote:
> 
> If I measure the power out on my K3 (set to 100W), P3, LP-100 and KPA1500 
> (power on but in standby), they all read quite close on 10-160M into a dummy 
> load. On 6M the P3 reads 16% higher than the other three. If I use 20W drive 
> from the K3 and put the KPA1500 in operate mode, the P3 and LP-100 read quite 
> close into a dummy load. But the KPA1500 reads about 6-11% higher on 
> 6-160M.The readings are close enough not to be concerned. Looking at the 
> KPA1500 manual there are commands to adjust the wattmeter readouts by band.  
> I tried commands in the KPA1500 utility Command Tester (^RV;) as an example, 
> but nothing happened. Checked the Port tab to make sure the utility is 
> connected to the amp.What am I doing wrong? Can you do what I am trying tp do 
> from the Command Tester.TnxN2TK, Tony
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[Elecraft] KPA1500 wattmeter adjustment

[N2TK via Elecraft]

If I measure the power out on my K3 (set to 100W), P3, LP-100 and KPA1500 
(power on but in standby), they all read quite close on 10-160M into a dummy 
load. On 6M the P3 reads 16% higher than the other three. If I use 20W drive 
from the K3 and put the KPA1500 in operate mode, the P3 and LP-100 read quite 
close into a dummy load. But the KPA1500 reads about 6-11% higher on 6-160M.The 
readings are close enough not to be concerned. Looking at the KPA1500 manual 
there are commands to adjust the wattmeter readouts by band.  I tried commands 
in the KPA1500 utility Command Tester (^RV;) as an example, but nothing 
happened. Checked the Port tab to make sure the utility is connected to the 
amp.What am I doing wrong? Can you do what I am trying tp do from the Command 
Tester.TnxN2TK, Tony
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Re: [Elecraft] KPA-1500 Power Supply

[N2TK via Elecraft]

Yep. And I keep the K3 on all the time.N2TK, Tony


-Original Message-
From: Larry Boekeloo 
To: elecraft@mailman.qth.net
Sent: Mon, Jan 3, 2022 11:30 am
Subject: [Elecraft] KPA-1500 Power Supply

Do most of you leave your KPA-1500 Power Supply powered up all the time
even with the RF Deck off?

Thanks.

Larry, KN8N
Kalamazoo, Michigan
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Re: [Elecraft] KPA1500 parameters

[N2TK via Elecraft]

Hi Dave,Yeah, sounds like it. Waiting for feedback from Elecraft support.At 
least I have the KPA500 as backup.N2TK, Tony


-Original Message-
From: Dave 
To: tony@verizon.net
Cc: k...@charter.net; elecraft@mailman.qth.net
Sent: Wed, Jul 7, 2021 8:55 am
Subject: Re: [Elecraft] KPA1500 parameters

Hi Tony,

Sounds like you might have lost one of the LDMOS devices. 

73
Dave wo2x

Sent from my waxed string and tin cans. 

> On Jul 7, 2021, at 7:16 AM, N2TK via Elecraft  
> wrote:
> 
> Thanks Larry.Just wanted to confirm what I was seeing wasn't normal.All of a 
> sudden with 25W drive I get Pwr - 530WCurrent - 29AVoltage - 53V with no 
> drive or 25W drive.
> N2TK, Tony
> 
> -Original Message-
> From: Larry (K8UT) 
> To: tony@verizon.net; elecraft@mailman.qth.net 
> Sent: Wed, Jul 7, 2021 4:35 am
> Subject: Re: [Elecraft] KPA1500 parameters
> 
> 25 in, 1322 out, 43% efficiency, 51.7 volts @ 59 amps with 1.5:1 SWR.
> 
> (see screenshot)
> 
> -larry (K8UT)
> 
> -- Original Message --
> From: "N2TK via Elecraft" 
> To: "elecraft@mailman.qth.net" 
> Sent: 2021-07-06 23:48:27
> Subject: [Elecraft] KPA1500 parameters
> 
>> What do you typically see for Power Out, Voltage and Current with 25 and 30W 
>> drive on 20M?TnxN2TK, Tony
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Re: [Elecraft] KPA1500 parameters

[N2TK via Elecraft]

Thanks Larry.Just wanted to confirm what I was seeing wasn't normal.All of a 
sudden with 25W drive I get Pwr - 530WCurrent - 29AVoltage - 53V with no drive 
or 25W drive.
N2TK, Tony

-Original Message-
From: Larry (K8UT) 
To: tony@verizon.net; elecraft@mailman.qth.net 
Sent: Wed, Jul 7, 2021 4:35 am
Subject: Re: [Elecraft] KPA1500 parameters

25 in, 1322 out, 43% efficiency, 51.7 volts @ 59 amps with 1.5:1 SWR.

(see screenshot)

-larry (K8UT)

-- Original Message --
From: "N2TK via Elecraft" 
To: "elecraft@mailman.qth.net" 
Sent: 2021-07-06 23:48:27
Subject: [Elecraft] KPA1500 parameters

>What do you typically see for Power Out, Voltage and Current with 25 and 30W 
>drive on 20M?TnxN2TK, Tony
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[Elecraft] KPA1500 parameters

[N2TK via Elecraft]

What do you typically see for Power Out, Voltage and Current with 25 and 30W 
drive on 20M?TnxN2TK, Tony 
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Re: [Elecraft] K4 - USB headphones

[N2TK via Elecraft]

Tnx Rick

N2TK, Tony

 

From: Rick Tavan  
Sent: Thursday, February 25, 2021 10:39 AM
To: N2TK, Tony 
Cc: Elecraft Reflector 
Subject: Re: [Elecraft] K4 - USB headphones

 

Good question, Tony. I don't see why a USB headset would not work but I haven't 
tried it myself, nor do I recall any conversation about it among the other 
field testers. I just ordered one for delivery tomorrow and will give it a try. 

 

73,

 

/Rick N6XI

 

On Wed, Feb 24, 2021 at 1:24 PM N2TK via Elecraft mailto:elecraft@mailman.qth.net> > wrote:

Will USB headphones/mike work in one of the USB ports?

N2TK, Tony

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-- 

--


Rick Tavan
Truckee and Saratoga, CA

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[Elecraft] K4 - USB headphones

[N2TK via Elecraft]

Will USB headphones/mike work in one of the USB ports?

N2TK, Tony

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Re: [Elecraft] Are Elecraft accepting return to Manufacturer for repairs yet ?

[N2TK via Elecraft]

Hi Tim,
Yep, they are accepting repairs. Sent one of my K3's for repair and a full 
checkout They added some mods. Happy with the fix, turn and price.
N2TK, Tony 

-Original Message-
From: elecraft-boun...@mailman.qth.net  On 
Behalf Of a4...@sy-edm.com
Sent: Monday, October 26, 2020 8:57 PM
To: elecraft@mailman.qth.net
Subject: [Elecraft] Are Elecraft accepting return to Manufacturer for repairs 
yet ?

Whilst I have read that California has been devastated by the horrific fires, 
and the world seems a little doomed with CV-19; There has also been signs of 
life within the Elecraft mother-ship, with K4 development. I am glad to see 
there is some progress for Elecraft, but as I am sitting 

So what is the current status of returning failed receiver back to Elecraft for 
repair - I have a dead KX3 - which was waiting the generation of a RSA since 
21st May 2020….  ??

I am sure that I am not the only person with equipment waiting return.

Thanks

Tim
 
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Re: [Elecraft] KPA500 Main Power - ON 24/7/365?

[N2TK via Elecraft]

Hi John,
Both my KPA500 and KPA1500 are on a shelf in the basement, literally right 
under my feet. The last time I shut them off was when I went to KP2M last 
February.
If the power switch isn't on I can't tun them on from Elecraft's remote 
software.
N2TK, Tony

-Original Message-
From: elecraft-boun...@mailman.qth.net  On 
Behalf Of Jack W9JH
Sent: Tuesday, October 20, 2020 12:17 AM
To: elecraft@mailman.qth.net
Subject: [Elecraft] KPA500 Main Power - ON 24/7/365?

Is there any harm in leaving the KPA500 rear MAIN Power Switch ‘ON', 24/7/365? 
(not the front panel power button).

I have done that with my KPA500 at the home station with no problem, but 
wondered about doing it at the remote site? I can operate the front panel “ON” 
button and “OPER/STBY” switch remotely so the amp is not running full-time, 
just the internal power supply. 

73,
Jack W9JH
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Re: [Elecraft] New boxes and packing for Elecraft equipment

[N2TK via Elecraft]

When I had sent my K3 to Elecraft for a going over a few months ago, it was
returned it in a nice custom foam and cardboard box, which I have saved.
N2TK, Tony

-Original Message-
From: elecraft-boun...@mailman.qth.net  On
Behalf Of Kimo Chun
Sent: Friday, October 9, 2020 10:14 AM
To: Elecraft@mailman.qth.net
Subject: [Elecraft] New boxes and packing for Elecraft equipment

Just as a reference. Over the years I've sent equipment to Yaesu USA for
repair. I sent them in the original sales box surrounded by a form-fitting
shipping box as I received it from the dealer. When I received it back both
boxes were within a new form-fitting box so I ended up with the equivalent
of a 3 wall thickness box.

It would be nice if Elecraft and others could do the same plus send back
equipment with new custom foam and in custom boxes (if they don't already)
if received without them. However, I do believe Yaesu did charge for the
overpacking. I don't recall if it was an option but I believe they may have
warned you of that fact and practice before you sent it in. I, for one,
welcome the safe practice to protect my equipment.

Of course, Yaesu and others build their higher end radios with a larger and
much heavier cast aluminum chassis which makes custom foam and boxes more
critical.

73, Kimo KH7U
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Re: [Elecraft] Inverted L for 160 meters

[N2TK via Elecraft]

As a reference, I have an 80M 4-sq with 5 elevated radials at each feed point 
and use a Comtek box. The radials were 1/4 wave. The pattern was terrible. Very 
little F/S and F/B. I measured the current in each radial. It was all over the 
place. I followed N6LF's info and cut the radials to 42'. I connected all 5 
radials together at each feed point then added a small coil between the 5 
radials and the coax shield to retune the elements. Now the current is very 
close with each radial and the F/S and F/B is much, much better. Read N6LF's 
stuff and take a look at balancing elevated radials if you go that route.
73,
N2TK, Tony

-Original Message-
From: elecraft-boun...@mailman.qth.net  On 
Behalf Of David Gilbert
Sent: Wednesday, August 26, 2020 2:11 PM
To: elecraft@mailman.qth.net
Subject: Re: [Elecraft] Inverted L for 160 meters



Yes, certainly current balance would minimize ground losses.  I hadn't thought 
much about it before, but I guess it's kind of intuitive in that it's analogous 
to lower return resistance losses due to better use of parallel ground paths.

73,
Dave  AB7E



On 8/26/2020 10:42 AM, Jim Brown wrote:
> On 8/26/2020 10:07 AM, David Gilbert wrote:
>> Radiation angle for a vertical antenna is much more a function of the 
>> ground conductivity out several wavelengths than it has to do with 
>> the current balance in the radials.
>
> Right, but N6LF has shown that current balance in radials, especially 
> elevated ones, minimizes ground losses.  Yes, elevated radials can be 
> modeled in less capable versions of NEC. All of this is addressed in 
> my slides.
>
> In all cases, the model must use soil conductivity representative of 
> the QTH. This is selected from a menu. Soil conductivity affects us 
> two ways. First, losses underneath the antenna. Better 
> radial/counterpoise systems can reduce this a lot. Second, loss in the 
> far field, over which we have no control, and those losses can vary a 
> lot if soil varies a lot in different directions. For example, a 
> vertical on a beach has much less far field loss, and much more energy 
> at low angles, in the direction of the water and much more far field 
> loss and higher angle energy than in directions over land.
>
> 73, Jim K9YC

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[Elecraft] Question on KPA-1500 Operation

[N2TK via Elecraft]

Can someone answer this question?

Thanks,

N2TK, Tony

 

 

Here's a question for you:

 

Scenario:  KPA-1500 **NOT** interfaced to a radio.

 

Set Up:  KPA-1500 ATU in bypass.  Mode is Operate.

 

Test:

 

1.  Put amp on 14 MHz band by pushing the button.

2.  Monitoring on another radio connected to no antenna.

3.  Put transmitter on 14025 kHz and send a C on the paddle or via memory keyer.

 

Question:

 

On the separate RX, was the first dash in the C clipped?

 

4.  Move the transmitter and separate RX to 14050 kHz.

5.  Send another C on the paddle or memory keyer.

 

Question:

 

Was the first dash in the C clipped?

 

My reason for asking:  Doing this test with the SPE 2K-FA results in first dash 
of the C being clipped.

Why is this important:  In SO2V when CQing on VFO-A, and S on VFO-B, the 
2K-FA's firmware

sees the 14025 RF and adjusts the internal ATU for that frequency EVEN IF THE 
ATU IS BYPASSED.

When a spot in VFO-B is called, if VFO-B is in another ATU segment, EVEN IF THE 
ATU IS BYPASSED,

the amp goes into bypass, realigns the ATU for the new segment, and then goes 
back into operate,

the result being that the first character of the transmission of VFO-B is 
clipped.  Many times when I

dump my call in on VFO-B to answer a CQ on that frequency, the guy comes back 
"?" since my N is

clipped into something unrecognizable.

 

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Re: [Elecraft] KPA 1500 HELP!!

[N2TK via Elecraft]

Ted,
Make sure the large red/black cables are pushed on all the way. You should feel 
a double click. If the light still is red suggest you contact Elecraft support.
GL
N2tK, Tony

-Original Message-
From: elecraft-boun...@mailman.qth.net  On 
Behalf Of Salvatore ["Ted"] K2QMF
Sent: Saturday, July 25, 2020 1:39 PM
To: Elecraft Support ; elecraft@mailman.qth.net
Subject: [Elecraft] KPA 1500 HELP!!

Hello,
I was in the IOTA Contest and a got a Fault message"FAULT: 50V Supply 
0.0Volts"!!!
I can't reset this Fault!!
And the HV/Supply Light on the PS is RED!
I tried turning the PS off and back on but no change!!
Any help or suggestions much appreciate...
73,
Ted  K2QMF

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Re: [Elecraft] KPA1500 Cooling

[N2TK via Elecraft]

Bill,
That is what I was trying to remember what we used for cooling for the
electrodes in RF plasma tools.
Thanks
N2TK, Tony

-Original Message-
From: elecraft-boun...@mailman.qth.net  On
Behalf Of Bill Frantz
Sent: Friday, July 24, 2020 9:56 PM
To: elecraft@mailman.qth.net
Subject: Re: [Elecraft] KPA1500 Cooling

The Cray-2 computer was cooled with "Fluorinert", a 3M product which is an
electrically insulating, stable fluorocarbon-based fluid.

73 Bill AE6JV

---
Bill Frantz| gets() remains as a monument | Periwinkle
(408)348-7900  | to C's continuing support of | 150 
Rivermead Rd #235
www.pwpconsult.com | buffer overruns. | 
Peterborough, NH 03458

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Re: [Elecraft] KPA1500 Cooling

[N2TK via Elecraft]

Tnx Paul

-Original Message-
From: W2xj  
Sent: Thursday, July 23, 2020 5:08 PM
To: tony@verizon.net
Cc: Paul Christensen ; elecraft@mailman.qth.net
Subject: Re: [Elecraft] KPA1500 Cooling

glycol and anti freeze. 

Sent from my iPad

> On Jul 23, 2020, at 4:49 PM, N2TK via Elecraft  
> wrote:
> 
> Hi Paul,
> I can't remember what we used to use for closed loop cooling. I don't think 
> we used distilled water because it's resistance would increase over time from 
> picking up ions from the metal. In our case it was cooling loops in a copper 
> 37" electrode. I thought it was some kind of antifreeze or maybe an oil? And 
> also isn't distilled water quite reactive?
> To many bourbons ago 
> N2TK, Tony
> 
> 
> -Original Message-
> From: elecraft-boun...@mailman.qth.net 
>  On Behalf Of Paul Christensen
> Sent: Thursday, July 23, 2020 3:54 PM
> To: elecraft@mailman.qth.net
> Subject: [Elecraft] KPA1500 Cooling
> 
>> "Until it leaks on the LDMOS devices."
> 
> Pure water is an insulator.  Leakage becomes a problem when water becomes 
> contaminated with conductive particles.  This rarely occurs in closed loop 
> systems that use distilled water when non-contaminating hoses, fittings, and 
> heat exchangers are used.  My 2KW LDMOS amp uses water cooling in such a
> closed system. 
> 
> My main amplifier at home is an Alpha PA-70V.  The amp uses an openly-cooled 
> vapor-phase system.  A pint of distilled water separates 4KV of plate voltage 
> and chassis ground.  Water is in direct contact with the plate. In time, air 
> particles do contaminate the water (usually in the form of algae) and the 
> system must be purged and refilled at annual intervals.  If leakage exceeds a 
> predetermined amount, the amp faults and shuts down.  
> 
> Paul, W9AC  
> 
> 
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> w...@w2xj.net


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Re: [Elecraft] KPA1500 Cooling

[N2TK via Elecraft]

Hi Paul,
I can't remember what we used to use for closed loop cooling. I don't think we 
used distilled water because it's resistance would increase over time from 
picking up ions from the metal. In our case it was cooling loops in a copper 
37" electrode. I thought it was some kind of antifreeze or maybe an oil? And 
also isn't distilled water quite reactive?
To many bourbons ago 
N2TK, Tony


-Original Message-
From: elecraft-boun...@mailman.qth.net  On 
Behalf Of Paul Christensen
Sent: Thursday, July 23, 2020 3:54 PM
To: elecraft@mailman.qth.net
Subject: [Elecraft] KPA1500 Cooling

>"Until it leaks on the LDMOS devices."

Pure water is an insulator.  Leakage becomes a problem when water becomes 
contaminated with conductive particles.  This rarely occurs in closed loop 
systems that use distilled water when non-contaminating hoses, fittings, and 
heat exchangers are used.  My 2KW LDMOS amp uses water cooling in such a
closed system. 

My main amplifier at home is an Alpha PA-70V.  The amp uses an openly-cooled 
vapor-phase system.  A pint of distilled water separates 4KV of plate voltage 
and chassis ground.  Water is in direct contact with the plate. In time, air 
particles do contaminate the water (usually in the form of algae) and the 
system must be purged and refilled at annual intervals.  If leakage exceeds a 
predetermined amount, the amp faults and shuts down.  

Paul, W9AC  


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Re: [Elecraft] K4 in production

[N2TK via Elecraft]

I would like to comment a little about the shipment of parts. Our company is
a USA company making discrete semiconductors. We are considered essential.
So, we have been open throughout this pandemic. 
We have a packaging and test facility in the Philippines for some of our
parts. Many component manufactures use Southeast Asia for packaging and
testing. It is not just the Covid-19 that has had an immense effect on
getting parts out of that region, but also the earthquakes, especially the
one on 2/16. We have not seen any parts out of that region since the
earthquake. In June Luzon opened up again. But you just don't start shipping
parts right away. You first got to perform maintenance on the equipment, run
quals and make a preproduction run. Even though our plant turned on in June,
we don't expect any parts till the end of August, at the earliest.
And don't forget about shipping. Even your Amazon Prime shipments may take
longer these days. And that is especially apparent when importing parts.
Things don't clear customs as quickly as they used to.
So, even essential businesses are having trouble getting parts. 
We are all affected in some way with Covid-19. 
72,
N2TK, Tony

-Original Message-
From: elecraft-boun...@mailman.qth.net  On
Behalf Of Jim Brown
Sent: Thursday, July 16, 2020 4:18 PM
To: elecraft@mailman.qth.net
Subject: Re: [Elecraft] K4 in production

On 7/16/2020 10:20 AM, Tox wrote:
> The parts availability issue was supposed to have been resolved pre-covid.

To varying degrees, the whole world is affected by COVID, including
manufacturers and distributors of parts. Few are designated as essential.

73, Jim K9YC
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Re: [Elecraft] Q codes

[N2TK via Elecraft]

Only ever got one QLF. In the late 1970's, two minutes to go at the end of the 
PA QSO party and found the last mult to get a clean sweep.   When I went to 
send the key fell apart. Yanked off the wires and touched them together to send 
call and info in CW. But I got him in the log and a clean sweep.  
N2TK, Tony

-Original Message-
From: elecraft-boun...@mailman.qth.net  On 
Behalf Of Fred Jensen
Sent: Friday, June 12, 2020 1:42 PM
To: elecraft@mailman.qth.net
Subject: Re: [Elecraft] Q codes

Good point Andy!  QLF seems to refer to sending ability.  ZBM2 refers to 
overall operating ability ... I think ... ACP's 126 and 131 leave a lot to the 
reader's imagination. Jack Phillips, MGY, might have used it on "Iceberg Night" 
had the Z's existed then when he was berating the operators on the Californian 
and a Navy vessel for poor operating procedure.

73,
Fred ["Skip"] K6DGW
Sparks NV DM09dn
Washoe County

On 6/11/2020 7:45 PM, Andy Durbin wrote:
> "ZBM2: "Place a competent operator on watch on this frequency."
>
> Is QLF the more sensitive equivalent??
>
> 73,
> Andy, k3wyc
>

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Re: [Elecraft] Self-fusing liquid electrical tape

[N2TK via Elecraft]

Now that was cool. Actually very hot 
N2TK, Tony

-Original Message-
From: elecraft-boun...@mailman.qth.net  On 
Behalf Of donov...@starpower.net
Sent: Friday, June 5, 2020 2:14 PM
To: elecraft@mailman.qth.net
Subject: Re: [Elecraft] Self-fusing liquid electrical tape

Hey Jim, 


If you think Cad-Welding a ground rod is fun to watch, take a look at thermite 
welding of railroad tracks: 


www.youtube.com/watch?v=5uxsFglz2ig 


73 
Frank 
W3LPL 

- Original Message -

From: "Jim Brown"  
To: elecraft@mailman.qth.net 
Sent: Friday, June 5, 2020 6:07:22 PM 
Subject: Re: [Elecraft] Self-fusing liquid electrical tape 

On 6/5/2020 10:23 AM, Chris Waldrup wrote: 
> This is probably overkill for QRP but I wanted to do it right like we used to 
> do in broadcast. 

The primary purpose of grounding bonding has NOTHING to do with radio -- 
it's for LIGHTNNG PROTECTION! 


On 6/5/2020 10:46 AM, Walter Underwood wrote: 
> Cad-weld seems a easier than the other approach described. It is more 
robust against corrosion, plus it is fun. 

Yes, it certainly is fun! I summoned my XYL and the neighbor's kid to 
watch. :) 

73, Jim K9YC 
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Re: [Elecraft] Self-fusing liquid electrical tape

[N2TK via Elecraft]

All my ground rods are below ground level. I didn't want to take a chance of 
failure so used 23 one-shots with #4 solid copper wire.  Maybe that is one of 
the reasons why I get away with never unhooking coax even when I watch 
lightning strike the tower. One point ground for everything, lightning 
arrestors on every coax and control line to the house, bonding the shield of 
all coax to the base of the tower probably helps too.
73,
N2TK, Tony

-Original Message-
From: elecraft-boun...@mailman.qth.net  On 
Behalf Of Art Greenberg
Sent: Friday, June 5, 2020 1:41 PM
To: elecraft@mailman.qth.net
Subject: Re: [Elecraft] Self-fusing liquid electrical tape

Yeah, maybe I'm one of the exceptions. I just used 20 of them to build a 
lightning ground system for a new tower install. Easy to use and considerable 
peace of mind knowing the joints created will last a long time underground.

--
Art Greenberg
WA2LLN
a...@artg.tv

On Fri, Jun 5, 2020, at 13:32, Phil Kane wrote:
> On 6/5/2020 9:05 AM, Grant Youngman wrote:
> 
> > Cad-weld isn’t expensive — $11-15 per weld depending on where you 
> > buy the stuff.  Typically sold in kits of 6 one-shot crucibles, and 
> > available for varying ground wire sizes on 1/2” or 5/8” ground rods.
> 
> Agreed, but how many of us would go through that exercise?
> 
> 73 de K2ASP - Phil Kane
> Elecraft K2/100   s/n 5402
> 
> From a Clearing in the Silicon Forest
> Beaverton (Washington County) Oregon
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Re: [Elecraft] NOT the feedline

[N2TK via Elecraft]

Walter,
Yes, the UHF connector may be rated at 500V, but in practice they handle >4KV. 
The voltage limit is set by the air gap between the center pin and the shield. 
I have not had a PL-259 arc over.
73,
N2TK, Tony

-Original Message-
From: elecraft-boun...@mailman.qth.net  On 
Behalf Of Walter Underwood
Sent: Monday, June 1, 2020 6:32 PM
To: Elecraft Reflector 
Subject: Re: [Elecraft] NOT the feedline

Even with a 1:1 SWR, 1000 W is pretty close to the 500 V peak rating for a UHF 
connector. Type N connectors are rated at 1500 V peak.

wunder
K6WRU
Walter Underwood
CM87wj
http://observer.wunderwood.org/ (my blog)

> On Jun 1, 2020, at 3:17 PM, George Kidder  wrote:
> 
> One of my antennas is a commercial "G5RV" fed with 33' of 450 ohm ladder 
> line, terminated in a PL-259 pair, with coax from there to the shack.  
> Apparently this combination results in very high RF voltage at the PL-259, 
> and it arcs over at 1000 W (not from an Elecraft amp!).  This combo goes wild 
> when I attempt high power on 80M, although it is stable at 100 W.  Just 
> another thing to watch out for!
> 
> 73 - George, W3HBM
> 
> On 6/1/2020 5:59 PM, Ted Edwards W3TB wrote:
>> [This message came from an external source. If suspicious, report to 
>> ab...@ilstu.edu]
>> 
>> I am following this with great interest.
>> Like Alan G0GNX, I also use an OCF, RG-8X out to the current balun in 
>> this case, 300 ohm to the antenna.  K3, KPA-500 and KAT-500.
>> 
>> If I am running stations in a contest on 40m and also 80m CW, It "appears"
>> that my VSWR rises after a half hour and then the KAT-500 starts to 
>> try to spontaneously retune.  Doesn't happen on 20m and up.  This 
>> past weekend in CQ WPX, I reduced drive so that output was about 300 
>> watts and it all became tame.
>> 
>> I had thought that it was a heating of the RG-8X; then I changed my 
>> mind to the current balun from Radiowavz that is rated for 1.5 KW.  I 
>> think it is the balun just getting hot out there.  I had used a W2AU 
>> 4:1 balun with my OCF, which is a voltage balun but I didn't know 
>> about that -- for upwards of 40 years and with the Elecraft equipment 
>> for about 4 years since I got the amp/tuner.  I just switched to a 
>> current balun last year with one that I bought at Dayton.
>> 
>> I would have expected more problem with the voltage balun than with 
>> the current balun.  I could change back to the W2AU if needed.
>> 
>> Interesting stuff, so I am reading along.  And my thanks to all of you.
>> 
>> On Mon, Jun 1, 2020 at 4:42 PM Fred Jensen  wrote:
>> 
>>> Nearly same experience Bob:  Sloping V, 135 ft legs, from top of 80 
>>> ft tower fed with homemade 600 ohm open wire using a DX Engineering 
>>> 4:1 "balun" [a strange, usually misunderstood piece of electronic 
>>> apparatus often used for the wrong reasons] rated at 10 KW.  It 
>>> warmed up noticeably at 1.2 KW RTTY use.  It helps to remember that 
>>> one can saturate a ferrite core [especially when very hot] which 
>>> creates a racket reminiscent of a non-synchronous spark gap TX.
>>> 
>>> 73,
>>> Fred ["Skip"] K6DGW
>>> Sparks NV DM09dn
>>> Washoe County
>>> 
>>> On 6/1/2020 1:48 PM, Bob McGraw K4TAX wrote:
 Based on my experience, balun power ratings are for MATCHED 
 conditions. It is rare that hams use a balun in a matched condition.
Thus a 1:1 balun should see 50 ohms on the input and 50 ohms on 
 the output, while a 4:1 balun should see 200 ohms on the output and 50
 ohms on the input.   In the case of a resonant folded dipole, a 4:1
 balun is typically operating in a nearly matched condition. All 
 others combinations are unknown and random.
 
 I run about 500 watts on all bands.  My baluns are rated at 5KW! It 
 takes 3 or 4 big hunkin' pieces of ferrite to attain this power
 level.   My 6 meter balun is a 1/2 wavelength electrically of RG-213.
 No ferrite!
 
 Buy or build a balun of your choice.  Using an IR temperature gun, 
 measure the ambient temperature of the core.  Run about 1/2 rated 
 power carrier for 30 to 60 seconds.  Measure the temperature again.
 If it is warm to hot, this is RF producing heat.   And likely
 continuing will produce core failure.   This is not a good balun for
 your application.
 
 One of my baluns work between the output of my KAT500 and the 
 balanced feed line connected to the center of a 256 ft wire.  That antenna
 works 160M - 6M with zero issues.   Now, I do run a hybrid balun being
 a 4:1 Guanella balun as a transformer, and it is fed with a 1:1 
 balun for common mode rejection.
 
 Most single core, i.e. 2 or 3 cores stacked with 2 to 4 windings are
 not at all a proper balun design   A Guanella balun will have 2 cores
 with 2 windings and then another 2 separate cores with another 2 
 windings.  These are then wired to produce a 4:1 balun with good
 common mode rejection.

Re: [Elecraft] Earpads Shedding

[N2TK via Elecraft]

Jim,
Do you remember what ones you got for the CM500?
Tnx
N2TK, Tony

-Original Message-
From: elecraft-boun...@mailman.qth.net  On 
Behalf Of Jim Bruce
Sent: Wednesday, May 6, 2020 4:31 PM
To: elecraft@mailman.qth.net; tso...@icloud.com
Subject: Re: [Elecraft] Earpads Shedding

I went online and got packs of the cloth headphone earmuff covers for mine. 
Work good, washable, stretchable, several in a pack, inexpensive. 
I got a small pack and large pack. large covers the yamaha 500 headphones well. 
 Smaller ones cover the cheaper music headphones.

Jim/W3FA

On 5/6/2020 13:58, Tommy Judson via Elecraft wrote:
> ...earpads are flaking pretty badly, leaving little back bits around 
> the home office/shack…
>
> Took me a while to realize it was my earpads shedding, glad to read this 
> isn’t an isolated occurrence.  Now how to remedy that problem?
>
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Re: [Elecraft] CM500 headset on K3S and KX3?

[N2TK via Elecraft]

I bought replacement ear pad cushions and earpad covers for Koss UR20, 
headphones on eBay a while back for $14.24. They fit the CM500 fine. A pain to 
change but worth it.
I have had very good results with CM500. They fit my head better than the 
Heil's which were too tight. I would rather have a material cover which I find 
more comfortable for wearing for many hours in a contest. I use a quarter of a 
paper towel between the headset cushions and my ears. That works fine.
And the CM500's are so cheap I bought a spare, just in case.
N2TK, Tony

-Original Message-
From: elecraft-boun...@mailman.qth.net  On 
Behalf Of Wes
Sent: Tuesday, May 5, 2020 9:45 PM
To: elecraft@mailman.qth.net
Subject: Re: [Elecraft] CM500 headset on K3S and KX3?

The failures I have are the ear pads disintegrate.  Someone said Koss pads 
could work but that hasn't been my experience. I've found some '500s at estate 
sales where I snap them up.  Currently the law firm where my fiance is employed 
is working from home and she's using a set on her computer to "attend" on-line 
meetings.  I guess I can add "IT Manager" to my resume, since I'm helping her 
with her connections.  I second the use of VOX.

Wes  N7WS

On 5/5/2020 5:32 PM, Jim Brown wrote:
> On 5/5/2020 4:44 PM, Paul Gacek via Elecraft wrote:
>> For what its worth and everyones milage will vary, I had a brand new 
>> CM500 that I used for a week of hard operating while on a pretty 
>> island and the boom came loose after a couple of days.
>
> Your experience is unusual. In about 11 years, the only thing that has 
> ever gone wrong with my CM500s have been a broken cable, which, 
> unfortunately, is not replaceable. I'm kind of a klutz, so I'm hard on 
> cables, dropping them, kicking them, etc. Perhaps it got broken in shipping?
>
> I've never used anything but VOX for SSB and digital modes. That's 
> always worked just fine as long as there's not loud noise (like when 
> the XYL walks through the shack and lets the screen door slam). :)
>
> 73, Jim K9YC
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Re: [Elecraft] 75 ohm coax

[N2TK via Elecraft]

I have been using Commscope F660BEF for years for both receive lines and
transmit coax for my 80M 4-sq using F-connectors. The other year I had a
100' piece of RG6 that had a solid copper center conductor and a copper
braid. Compared that to the F660BEF on 1.8 and 3.5 for loss at 100'. I did
not see any difference in power loss. I guess the F660BEF has enough copper
plate to keep losses low on the low bands. Or maybe I just had a bad piece
of copper RG6?
N2TK, Tony

-Original Message-
From: elecraft-boun...@mailman.qth.net  On
Behalf Of Frederick Dwight
Sent: Friday, April 3, 2020 2:09 AM
To: elecraft@mailman.qth.net
Subject: [Elecraft] 75 ohm coax

If your 75 ohm coax has a steel/copper coated center conductor, be sure to
test it for loss on the lowest frequency band you will use.  I experimented
with a steel core 160 meter antenna and found it had some additional loss
and probably due to the inductance it could be shorter for resonance (10 %
perhaps ??) so I abandoned the idea.  Never noticed the effect on higher
frequencies. 

Sent from Mail for Windows 10

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Re: [Elecraft] K3 SSB Filters

[N2TK via Elecraft]

John, I concur. When I am running them especially on 20M I find I have the
LO Cut at .35 and the HI Cut at 2.25-2.35. Audio is good. Below 2.25 if the
calling station is a little off freq or has terrible audio I may waste time
trying to get the call.
N2TK, Tony

-Original Message-
From: elecraft-boun...@mailman.qth.net  On
Behalf Of j...@kk9a.com
Sent: Wednesday, April 1, 2020 7:30 AM
To: elecraft@mailman.qth.net
Subject: Re: [Elecraft] K3 SSB Filters

I concur. I have 2.8, 2.1 and 1.8 KHz 8 pole roofing filters in my K3S. I
made over 8500 SSB QSOs last month and I used the 2.1 KHz roofing filter for
all of them.

John KK9A



Jim Brown K9YC wrote:


I tried that and didn't like the result. I prefer 2.1 kHz 8 pole

73, Jim K9YC


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Re: [Elecraft] The Big Three...

[N2TK via Elecraft]

Hi Frank,
I agree with what you said about CW rigs and lightweight rigs for traveling. 
The K3 on SSB sure has its faults. What say you on the top SSB rigs?

Also, since no Dayton and the idea of a contest that weekend is a good idea. 
But maybe we should consider some kind of virtual hospitality suite so we can 
have a beer or two plus chat.
N2TK, Tony
 

-Original Message-
From: elecraft-boun...@mailman.qth.net  On 
Behalf Of donov...@starpower.net
Sent: Sunday, March 29, 2020 12:33 PM
To: Elecraft@mailman.qth.net
Subject: Re: [Elecraft] The Big Three...

This is by far not an unbiased survey. Teams that travel on airplanes to get to 
WRTC will be strongly biased toward light weight radios such as the K3. 
Operators who do not travel by a irplane will be biased towards radios with 
much better SSB performance. 


73
Frank
W3LPL 

- Original Message -

From: "K9FD" 
To: "Paul Gacek" 
Cc: Elecraft@mailman.qth.net
Sent: Sunday, March 29, 2020 4:26:55 PM
Subject: Re: [Elecraft] The Big Three... 

I agree Paul, and my comment was to play the stats in jest. 

when the glass is half full you can see it from both sides, 

I did that to stir the Elecraft kool aide crew. 

Having contested many many years in my past life, I dont own
3 - K3 radios because they are losers, and nope I am not in the class of any 
one who qualifies for WRTC. not even close, and at 75 I am not progressing any 
longer, I am on the slipping side of downhill. 

73 Merv K9FD 
> Merv
> 
> Now we entering the arena of stats can tell you whatever you want them to 
> tell you! 
> 
> In fairness only one of the top teams was a US team (I think) and 3 of the 
> top 15 were US. Maybe radio choice for the Europeans is more to do with ICOM 
> et al possibly having a more direct sales and support presence in EU versus 
> Elecraft which is via local distributors and possibly requiring the gear to 
> return to Cal for repair. Just a guess  
> 
> I think the WRTC leader role for the Boston/NE one had more US teams placing. 
> I’m sure a story exists around home team advantage. 
> 
> I can only reiterate that anyone who participates in WRTC has to be pretty 
> awesome and I wish I had 1% of their skills!! 
> 
> Stats are fun. 
> 
> Paul Gacek
> 
>> On Mar 29, 2020, at 8:50 AM, K9FD  wrote: 
>> 
>> SO lets see, we are saying that 50 percent used Elecraft, and out of 
>> the top 3 no one did, and most who used Elecraft were in the bottom.
>> So was it the radio or the operator? 
>> If you look at it from one point of view, loosers used Elecraft.. 
>> 
>> Merv K9FD, and I own 3 - k3 radios so not biased. 
>> 
>> 
>>> Wasn't my subject line. But I'll see your four and raise it to five: 
>>> Elecraft, Flex, Icom, Kenwood and Yaesu. 
>>> 
>>> Wes N7WS
>>> 
 On 3/29/2020 6:55 AM, Michael Walker wrote: 
 I find you mention the big 3, but it is really the big 4. 
 
 Mike va3mw
 
 
> On Sun, Mar 29, 2020 at 9:28 AM Wes  > wrote: 
 FWIW. I took a cursory look at the top 10 to see what they were using. 
 
 You have to get to 5th place to find a pair of K3s. Sixth and 7th 
 places use one K3 and something else for the second radio.
 
 So four out of 20 radios were K3s. 
 
 Also of interest 6 out of 10 used WinTest with 4 using N1MM+. 
 
 Wes N7WS
 
 
> On 3/29/2020 2:50 AM, Paul Gacek via Elecraft wrote: 
 > If you follow the link you can see what radios the 50+ WRTC 2018
 participant teams used. 
 > 
 > Lots of K3. 
 > 
 > http://wrtc2018.de/competition/finalscores.php
 > 
 > Paul
 > W6PNG/M0SNA
 > www.nomadic.blog
 
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>>> __
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Re: [Elecraft] K4 Internal and External display resolution

[N2TK via Elecraft]

Now you are making me drool
N2TK, Tony

-Original Message-
From: elecraft-boun...@mailman.qth.net  On
Behalf Of Eric Swartz - WA6HHQ, Elecraft
Sent: Thursday, January 2, 2020 7:23 PM
To: Dave Erickson ; Elecraft@mailman.qth.net
Subject: Re: [Elecraft] K4 Internal and External display resolution

Hi Dave,

The K4's internal LCD has a resolution 1024x600, which is very sharp.

We also demonstrate the K4 with a large external 1920x1080 HDMI compatible
monitor. Our h/w should support up to 4K external monitors.

Note that rather than just mirroring the internal color LCD of the K4 on the
external monitor, we can display data independently from the LCD at the same
time in whatever format we wish, such as the full screen spectrum and
waterfall display we've been showing at the shows at 1920x1080.

73,
Eric
/elecraft.com/
-

On 1/1/2020 11:46 AM, Dave Erickson wrote:
> ...
> On a more serious note, has it been revealed yet what resolution the 
> built in display will have? I am in the market and all the other 
> radios in this class seem to have quite low pixel densities. And most 
> of those have the display outputs at the same very low resolutions.
>
> Happy New Year to all.
>

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Re: [Elecraft] K3 - Power cable voltage drop

[N2TK via Elecraft]

Bob,
The power strip is gone for the K3's. Now direct connections from the PS to 
each K3.
The power strip is good for replacing the walwarts.
N2TK, Tony

-Original Message-
From: elecraft-boun...@mailman.qth.net  On 
Behalf Of Bob McGraw
Sent: Sunday, December 22, 2019 12:45 PM
To: elecraft@mailman.qth.net
Subject: Re: [Elecraft] K3 - Power cable voltage drop

Rid your station of the DC power strip.  It will cause problems. More 
connections in the path will be more DC voltage drip.  The radios should be 
connected direct to the power supply.

As to the Astron SS-30M, I have 3 of those.  They are great. I did find the 
provided DC connections where the wires are inserted into the blocks and 
secured with a screw from the side would not accommodate the 4 needs for DC at 
my station.Therefore, I took two pieces of  2" x 10-32 brass machine screw, 
cut off the head, filed a small flat spot on one side at the end to make it 
slightly D shaped.   Inserted that end into the DC connector and tightened the 
set screw against the flat spot. Then added as needed the brass nuts, flat 
washers and lock washers, secured finally by another brass nut.   This in 
effect gives me very adequate terminal length to attach as many DC power leads 
with suitable ring terminals as needed.  DC resistance has therefore been 
minimized. The 10 ga wire is a good addition for radio power needs.

I also added a dedicated ground between the ground screw on the back of the 
radio to the ground screw on the power supply.

73

Bob, K4TAX

12/22/2019 10:47 AM, N2TK via Elecraft wrote:

> I have been using an Astron SS-30M power supply for several years to 
> feed two K3's.
> I use 12ga wire from the power supply to an MFJ-4012 power strip. From 
> the power strip I use 12ga wire to each K3. Total length from power 
> supply to a
> K3 was 8'. Each K3 is set for 100W on 30M into a dummy load.  The K3's 
> were tested one at a time. The power supply voltage went from 14.38 to 
> 14.30 at 100W.
> Both K3's read the same on the K3's internal voltmeter - 14.1V in 
> receive and 12.7V at 100W setting on the K3's. The P3 read 107W out.
> Changed the cable to 10ga wire direct from the power supply to each K3.
> Length of each is 7'. Same test. Power supply voltage was still 14.39/14.30.
> Voltage on each K3 was now 14.2v. Key down 13.6V. So, 0.6V drop in 7' 
> of 10ga wire.
> P3 output was now 114W.
> I never transmit with both K3's at the same time.
> Just a data point.
> 73 and Merry Christmas
> N2TK, Tony
>
>
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Re: [Elecraft] K3 - Power cable voltage drop

[N2TK via Elecraft]

Hi Don,
With the 10ga wire the power distribution strip is not used. There are two runs 
of 7' each direct from the power supply to a K3. The run is 7' because I have 
the power supply with the rest of my supplies, router, etc. all mounted 
underneath my desk to the side to keep the desktop clean. I don't hink 0.6V 
drop is too much to be concerned with. The amps are in the basement. 
In the process of adding Green Heron Everywhere wireless remotes to eliminate 
the manual switches too.

73 and merry Christmas
N2TK, Tony 

-Original Message-
From: Don Wilhelm  
Sent: Sunday, December 22, 2019 11:21 AM
To: tony@verizon.net; elecraft@mailman.qth.net
Subject: Re: [Elecraft] K3 - Power cable voltage drop

Tony,

While those figures with the 10 gauge wire are good, they would be better if 
you ran the K3 power directly from the power supply rather than from the power 
distribution strip.

Each connection will have some voltage drop, so in addition to increasing the 
wiring gauge, reducing the connection points will help just as much.

73 Merry Christmas, or Happy Hanukkah whichever you choose to celebrate.
Don W3FPR

On 12/22/2019 10:47 AM, N2TK via Elecraft wrote:
> I have been using an Astron SS-30M power supply for several years to 
> feed two K3's.
> I use 12ga wire from the power supply to an MFJ-4012 power strip. From 
> the power strip I use 12ga wire to each K3. Total length from power 
> supply to a
> K3 was 8'. Each K3 is set for 100W on 30M into a dummy load.  The K3's 
> were tested one at a time. The power supply voltage went from 14.38 to 
> 14.30 at 100W.
> Both K3's read the same on the K3's internal voltmeter - 14.1V in 
> receive and 12.7V at 100W setting on the K3's. The P3 read 107W out.
> Changed the cable to 10ga wire direct from the power supply to each K3.
> Length of each is 7'. Same test. Power supply voltage was still 14.39/14.30.
> Voltage on each K3 was now 14.2v. Key down 13.6V. So, 0.6V drop in 7' 
> of 10ga wire.
> P3 output was now 114W.

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[Elecraft] K3 - Power cable voltage drop

[N2TK via Elecraft]

I have been using an Astron SS-30M power supply for several years to feed
two K3's. 
I use 12ga wire from the power supply to an MFJ-4012 power strip. From the
power strip I use 12ga wire to each K3. Total length from power supply to a
K3 was 8'. Each K3 is set for 100W on 30M into a dummy load.  The K3's were
tested one at a time. The power supply voltage went from 14.38 to 14.30 at
100W.
Both K3's read the same on the K3's internal voltmeter - 14.1V in receive
and 12.7V at 100W setting on the K3's. The P3 read 107W out.
Changed the cable to 10ga wire direct from the power supply to each K3.
Length of each is 7'. Same test. Power supply voltage was still 14.39/14.30.
Voltage on each K3 was now 14.2v. Key down 13.6V. So, 0.6V drop in 7' of
10ga wire.
P3 output was now 114W.
I never transmit with both K3's at the same time.
Just a data point.
73 and Merry Christmas
N2TK, Tony
  

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Re: [Elecraft] K3 - WSJT-X help

[N2TK via Elecraft]

Hi Pete,
Maybe it is just magic?
73,
N2TK, Tony

-Original Message-
From: elecraft-boun...@mailman.qth.net  On 
Behalf Of N4ZR
Sent: Wednesday, November 13, 2019 9:23 AM
To: elecraft@mailman.qth.net
Subject: Re: [Elecraft] K3 - WSJT-X help

I run into this over and over with Windows 10, and I'm embarrassed to say I 
often don't know what makes the difference.  I use the microphone input and 
speakers output on an outboard USB sound card, and generally find myself just 
dinking around with the various sound settings until I find something that 
causes it to start working.  My suspicion is that Windows 10 update has a nasty 
habit of resetting audio arrangements to some arbitrary set of "defaults."

73, Pete N4ZR
Check out the Reverse Beacon Network
at <http://reversebeacon.net>, now
spotting RTTY activity worldwide.
For spots, please use your favorite
"retail" DX cluster.

On 11/13/2019 8:10 AM, N2TK via Elecraft wrote:
> Don,
> Tnx for the reminder on checking the audio on the ALC meter. It was so long 
> since I had a problem I forgot about doing that. There was no audio shown on 
> the K3. What happened is that in WSJT-X > Settings > Audio > Soundcard, The 
> OUTPUT was no longer Speakers (USB Audio CODEC). Somehow it changed to 
> SPEAKERS (Realtek High Definition Audio), which is my audio for my pc. 
> Changed it to what it was supposed to be and now I am fine. I have no idea 
> what changed the setting as I was working station after station when this 
> happened.
> Weird.
>
> 73,
> N2TK, Tony
>
> -Original Message-
> From: Don Wilhelm 
> Sent: Wednesday, November 13, 2019 7:40 AM
> To: tony@verizon.net; elecraft@mailman.qth.net
> Subject: Re: [Elecraft] K3 - WSJT-X help
>
> Tony,
>
> Soundcard problem or K3 problem.  This is most commonly a problem with audio 
> into the K3.
>
> How many bars illuminate on the ALC meter?  It should be 4 with the 5th bar 
> flashing.  If not, look at the audio levels.
>
> See the article on my website www.w3fpr.com
>
> 73,
> Don W3FPR
>
> On 11/13/2019 7:04 AM, N2TK via Elecraft wrote:
>> Scratching my head. I was making Q's on FT8 with my K3 and WSJT-X,
>> v2.0.1 when I no longer would get power out.
>>
>> WSJT is keying the K3 (Red transmit light is on) but no power out. 
>> The
>> K3 keys fine with power out in CW or other modes is fine. WSJT is 
>> talking to the K3. WSJT shows the correct frequency, it is decoding 
>> and when I go into Settings > Radio and hit Test CAT it goes green.
>> When I hit TUNE on WSJT it turns to red and the red TX light on the K3 comes 
>> on. But no power out.
>>
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Re: [Elecraft] K3 - WSJT-X help

[N2TK via Elecraft]

Hi Bob,
What is puzzling is why the audio settings were changed on WSJT. I surely 
wouldn't have gone into the program and make a change like that while running 
stations.
73,
N2TK, Tony

-Original Message-
From: elecraft-boun...@mailman.qth.net  On 
Behalf Of Bob McGraw K4TAX
Sent: Wednesday, November 13, 2019 9:31 AM
To: elecraft@mailman.qth.net
Subject: Re: [Elecraft] K3 - WSJT-X help

Using Windows 10 Pro, I do use the computer for other audio activities, editing 
music, choir performances, listening to music and such.   This will change the 
audio parameter settings of Windows.Thus one needs to understand the 
various selections and audio level values for the computer, the software and 
the radio.

I use the USB input on my K3S and have a single USB cable which connects to the 
computer.  I do not have or use a separate interface.  I find this keeps things 
more reliable and less complex.  The WSJT-X software sets the radio parameters 
when I open the application. I may need to tweak the computer levels a bit, 
depending on what I was doing last. Otherwise, it is solid and reliable.

73

Bob, K4TAX


On 11/13/2019 8:22 AM, N4ZR wrote:
> I run into this over and over with Windows 10, and I'm embarrassed to 
> say I often don't know what makes the difference.  I use the 
> microphone input and speakers output on an outboard USB sound card, 
> and generally find myself just dinking around with the various sound 
> settings until I find something that causes it to start working.  My 
> suspicion is that Windows 10 update has a nasty habit of resetting 
> audio arrangements to some arbitrary set of "defaults."
>
> 73, Pete N4ZR
> Check out the Reverse Beacon Network
> at <http://reversebeacon.net>, now
> spotting RTTY activity worldwide.
> For spots, please use your favorite
> "retail" DX cluster.
>
> On 11/13/2019 8:10 AM, N2TK via Elecraft wrote:
>> Don,
>> Tnx for the reminder on checking the audio on the ALC meter. It was 
>> so long since I had a problem I forgot about doing that. There was no 
>> audio shown on the K3. What happened is that in WSJT-X > Settings > 
>> Audio > Soundcard, The OUTPUT was no longer Speakers (USB Audio 
>> CODEC). Somehow it changed to SPEAKERS (Realtek High Definition 
>> Audio), which is my audio for my pc. Changed it to what it was 
>> supposed to be and now I am fine. I have no idea what changed the 
>> setting as I was working station after station when this happened.
>> Weird.
>>
>> 73,
>> N2TK, Tony
>>
>> -Original Message-
>> From: Don Wilhelm 
>> Sent: Wednesday, November 13, 2019 7:40 AM
>> To: tony@verizon.net; elecraft@mailman.qth.net
>> Subject: Re: [Elecraft] K3 - WSJT-X help
>>
>> Tony,
>>
>> Soundcard problem or K3 problem.  This is most commonly a problem 
>> with audio into the K3.
>>
>> How many bars illuminate on the ALC meter?  It should be 4 with the 
>> 5th bar flashing.  If not, look at the audio levels.
>>
>> See the article on my website www.w3fpr.com
>>
>> 73,
>> Don W3FPR
>>
>> On 11/13/2019 7:04 AM, N2TK via Elecraft wrote:
>>> Scratching my head. I was making Q's on FT8 with my K3 and WSJT-X,
>>> v2.0.1 when I no longer would get power out.
>>>
>>> WSJT is keying the K3 (Red transmit light is on) but no power out. 
>>> The
>>> K3 keys fine with power out in CW or other modes is fine. WSJT is 
>>> talking to the K3. WSJT shows the correct frequency, it is decoding 
>>> and when I go into Settings > Radio and hit Test CAT it goes green.
>>> When I hit TUNE on WSJT it turns to red and the red TX light on the
>>> K3 comes on. But no power out.
>>>
>> __
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>> email list: http://www.qsl.net/donate.html Message delivered to 
>> n...@comcast.net
>>
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Re: [Elecraft] K3 - WSJT-X help

[N2TK via Elecraft]

I was on 20M at the time the problem arose. Will watch to see if it happens 
again as to what band and which antenna I am using.

73,

N2TK, Tony

 

From: Carl Yaffey  
Sent: Wednesday, November 13, 2019 10:40 AM
To: tony@verizon.net
Cc: Bob Gibson via Elecraft 
Subject: Re: [Elecraft] K3 - WSJT-X help

 

I have had this happen intermittently when using the KPA1500 with my K3S. I’m 
pretty sure it’s an RF feedback issue with the PC + WSJT-X. Never happens when 
NOT on FT8.

 





On Nov 13, 2019, at 7:04 AM, N2TK via Elecraft mailto:elecraft@mailman.qth.net> > wrote:

 

Scratching my head. I was making Q's on FT8 with my K3 and WSJT-X, v2.0.1
when I no longer would get power out.

WSJT is keying the K3 (Red transmit light is on) but no power out. The K3
keys fine with power out in CW or other modes is fine. WSJT is talking to
the K3. WSJT shows the correct frequency, it is decoding and when I go into
Settings > Radio and hit Test CAT it goes green. When I hit TUNE on WSJT it
turns to red and the red TX light on the K3 comes on. But no power out. 



The typical setup is LP-Bridge, DXBase, DXBridge, WSJT-X. Yes, I know I need
to update to DXLab to properly interface. So I closed everything but WSJT-X
and have it talking directly to the K3. No difference. Also using the USB
interface on the K3.



Any ideas what could have happened and any suggestions? Maybe I bumped
something?

N2TK, Tony  

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Message delivered to cyaf...@gmail.com <mailto:cyaf...@gmail.com>  

 

Carl Yaffey  K8NU
Recording studio.
cyaffey at  gmail.com <http://gmail.com>  
614 268 6353, Columbus OH
http://www.carl-yaffey.com
http://www.grassahol.com
http://www.bluesswing.com
Https://www.columbusfolkmusicsociety.org
http://www.timbrewolves.carl-yaffey.com
http://www.columbusshotokankarate.com









 

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Re: [Elecraft] K3 - WSJT-X help

[N2TK via Elecraft]

Don,
Tnx for the reminder on checking the audio on the ALC meter. It was so long 
since I had a problem I forgot about doing that. There was no audio shown on 
the K3. What happened is that in WSJT-X > Settings > Audio > Soundcard, The 
OUTPUT was no longer Speakers (USB Audio CODEC). Somehow it changed to SPEAKERS 
(Realtek High Definition Audio), which is my audio for my pc. Changed it to 
what it was supposed to be and now I am fine. I have no idea what changed the 
setting as I was working station after station when this happened.
Weird.

73,
N2TK, Tony

-Original Message-
From: Don Wilhelm  
Sent: Wednesday, November 13, 2019 7:40 AM
To: tony@verizon.net; elecraft@mailman.qth.net
Subject: Re: [Elecraft] K3 - WSJT-X help

Tony,

Soundcard problem or K3 problem.  This is most commonly a problem with audio 
into the K3.

How many bars illuminate on the ALC meter?  It should be 4 with the 5th bar 
flashing.  If not, look at the audio levels.

See the article on my website www.w3fpr.com

73,
Don W3FPR

On 11/13/2019 7:04 AM, N2TK via Elecraft wrote:
> Scratching my head. I was making Q's on FT8 with my K3 and WSJT-X, 
> v2.0.1 when I no longer would get power out.
> 
> WSJT is keying the K3 (Red transmit light is on) but no power out. The 
> K3 keys fine with power out in CW or other modes is fine. WSJT is 
> talking to the K3. WSJT shows the correct frequency, it is decoding 
> and when I go into Settings > Radio and hit Test CAT it goes green. 
> When I hit TUNE on WSJT it turns to red and the red TX light on the K3 comes 
> on. But no power out.
> 

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[Elecraft] K3 - WSJT-X help

[N2TK via Elecraft]

Scratching my head. I was making Q's on FT8 with my K3 and WSJT-X, v2.0.1
when I no longer would get power out.

WSJT is keying the K3 (Red transmit light is on) but no power out. The K3
keys fine with power out in CW or other modes is fine. WSJT is talking to
the K3. WSJT shows the correct frequency, it is decoding and when I go into
Settings > Radio and hit Test CAT it goes green. When I hit TUNE on WSJT it
turns to red and the red TX light on the K3 comes on. But no power out. 

 

The typical setup is LP-Bridge, DXBase, DXBridge, WSJT-X. Yes, I know I need
to update to DXLab to properly interface. So I closed everything but WSJT-X
and have it talking directly to the K3. No difference. Also using the USB
interface on the K3.

 

Any ideas what could have happened and any suggestions? Maybe I bumped
something?

N2TK, Tony  

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Re: [Elecraft] Teat

[N2TK via Elecraft]

Was it a typo? (said in the voice of Jeff Goldblum)

-Original Message-
From: elecraft-boun...@mailman.qth.net  On
Behalf Of Dave Cole
Sent: Tuesday, November 12, 2019 1:10 PM
To: elecraft@mailman.qth.net
Subject: Re: [Elecraft] Teat

That is a funny typo...

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

On 11/12/19 9:33 AM, Jim KO5V wrote:
> Testing new email address.
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Re: [Elecraft] K4: superhet vs. direct sampling

[N2TK via Elecraft]

Hi Clay, Presently I have a pair of K3's. One is my main rig and one is my 
backup and traveling rig. I will sell my one K3 and keep the other as the 
backup and traveling rig when the K4 arrives. 
73,
N2TK, Tony

-Original Message-
From: elecraft-boun...@mailman.qth.net  On 
Behalf Of Clay Autery
Sent: Wednesday, June 5, 2019 12:05 AM
To: elecraft@mailman.qth.net
Subject: Re: [Elecraft] K4: superhet vs. direct sampling

Was thinking the very same thing  but I am not so sure I will be able to 
let my K3S go...  I may just be adding...  And then I can make the K3S a 
traveling system.

__
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(318) 518-1389

On 04-Jun-19 21:50, Bill Johnson wrote:
> Wayne, all these options and modernizations, even though I love my K3S and 
> really don't need to upgrade, I will be "forced" to break down and buy one.
>
> 72 & 73,
> Bill
> K9YEQ
> FT'er for K2, KX1, KX3, KXPA100,  KAT500, W2, etc.
>
> -Original Message-
> From: elecraft-boun...@mailman.qth.net 
>  On Behalf Of Wayne Burdick
> Sent: Tuesday, June 4, 2019 9:19 PM
> To: Elecraft Reflector 
> Subject: [Elecraft] K4: superhet vs. direct sampling
>
> The superhet module buys a lot of BDR improvement. But also -- a subtlety 
> I've failed to mention so far -- the superhet module is intended to somewhat 
> improve 2 kHz IMDDR3 *and* make this figure more repeatable.
>
> Q: Say what?
>
> A: As Rob Sherwood noted many times before finally immortalizing this point 
> in his must-read footnotes, A-to-D converters sharing the same part number 
> are not all created equal. The long-time previous occupant of his Top Spot 
> benefitted from a never-corroborated monotonicity in its ADC's LSBs. An act 
> of god. The product of a very good day at the silicon foundry when, 
> serendipitously, all the bunny suits were defect-free, and no one was 
> exhaling molecules of grain alcohol or other substances from the night before.
>
> That said, most ops can get by without the extra BDR and IMDDR3, because 
> they're not situated in the RF equivalent of the Gulf Stream. Hence the 
> different K4 models.
>
> 73,
> Wayne
> N6KR
>
>
>> On Jun 4, 2019, at 5:10 PM, Lyle Johnson  wrote:
>>
>> Mark,
>>
>> The "20 dB lower than a K3" figure is an estimate for 100 kHz Blocking 
>> Dynamic Range rather than the 2 kHz Narrow Spaced Dynamic Range.
>>
>> The K3 is listed at 140 to 150 dB (depending on model, synthesizer, etc) on 
>> Sherwood's Receiver Test Data page.  The K4 series without the "HD" option 
>> are estimated to be in the 120 to 130 dB range, typical of other direct 
>> sampling SDR products (Flex, Apache, Icom, ...).
>>
>> 73,
>>
>> Lyle KK7P
>>
>> On 6/4/19 4:00 PM, mark roz via Elecraft wrote:
>>> Before putting my money up front for the first run of K4D I need to 
>>> know what is the dynamic range of the K4D RX at 2kHz spacing. K3 is 105 dB 
>>> and K4D? If it is 20dB lower than K3 than it would be 85dB-correct?
>
>
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Re: [Elecraft] Elecraft K4 and Accessibility

[N2TK via Elecraft]

Jim,
I feel like a newbie. Only 56 years for me. But I agree. When I haul the K3
to KP2M the only knobs I use when I am on frequency are the AF gain and RIT
for those who are off frequency. 
N2TK, Tony

-Original Message-
From: elecraft-boun...@mailman.qth.net  On
Behalf Of Jim Brown
Sent: Sunday, May 26, 2019 2:29 PM
To: elecraft@mailman.qth.net
Subject: Re: [Elecraft] Elecraft K4 and Accessibility

On 5/24/2019 5:00 PM, hwhi...@maine.rr.com wrote:
> I suggest you double the size of the radio and change your design
criteria.

This is exactly the opposite of how I feel about radios -- I'll be 78 in the
fall, but I'm still an active guy dragging my gear to portable setups, and
my shack is a SO2R contesting setup (single op, two radios). 
For both reasons, I am VERY happy with the light weight and small footprint
of the K3 (as well as it's predecessor, the K2, and relatives, the KX3 and
KX2). I don't want big knobs or even a lot of knobs -- when I'm operating,
the only knobs I'm using are the gain controls and whatever changes
frequency, including RIT or XIT.

But what do I know -- I've only been doing it for 63 years.

73, Jim K9YC

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Re: [Elecraft] Elecraft / IC-7610 comparison

[N2TK via Elecraft]

Maybe provide an overlay picture when you take off the cover that looks like an 
old tube rig including the tube glow?
Also, Elecraft can offer an option for those that feel a rig has to weigh a lot 
to work - steel plates with the Elecraft logo in 5 and 10 lb. increments that 
can be "stacked" on the bottom of the rig for extra weight.
N2TK, Tony

-Original Message-
From: elecraft-boun...@mailman.qth.net  On 
Behalf Of Bill
Sent: Tuesday, May 21, 2019 9:58 AM
To: elecraft@mailman.qth.net
Subject: Re: [Elecraft] Elecraft / IC-7610 comparison

Chuck:  Hate to disappoint, but the inside of the K4 will no doubt look like a 
computer (my K3 does) - which is exactly what it is. Nothing recognizable as RF 
related for us old timers to relate to.

Don't get me wrong. I like my new rigs, but I do miss things I could understand 
(and repair). To say nothing of the warm glow on a winter night.


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