Re: [Elecraft] PTT KEY CONFIG setting volatile?

[Don Wilhelm]

Danny,

Do a test without WSJT running.  Set PTT key config to DTR - OFF, then 
cycle power on the K3S.  Does that setting survive the power cycle?  If 
so, it is not a K3S problem, look to the WSJT software for the solution.

If it does not survive the power cycle, contact K3Support.

73,
Don W3FPR

On 5/23/2016 1:08 AM, danny.higgins wrote:

I have this on my K3S with the latest firmware. I use WSJT to key the K3S via 
the USB port and I operate in USB mode, not Data.  Every time I power the K3S 
OFF I need to reset the PTT Key config to DTR – OFF.

Danny, G3XVR


From: Vic Rosenthal 4X6GP/K2VCO
Sent: 23 May 2016 04:29
To: elecraft@mailman.qth.net
Subject: Re: [Elecraft] PTT KEY CONFIG setting volatile?

Which radio is it? I've never seen this on my K3.
If you are running some kind of rig control software, try it with the
software not running.

73,
Vic, 4X6GP/K2VCO
Rehovot, Israel
http://www.qsl.net/k2vco/

On 23 May 2016 05:51, Ken Arck wrote:

Sounds like a call to Elecraft tomorrow because this is repeatable!




At 07:42 PM 5/22/2016, Cady, Fred wrote:

That doesn't sound right.  I don't think mine has ever changed.
Cheers,
Fred KE7X


From: Elecraft  on behalf of Ken
Arck 
Sent: Sunday, May 22, 2016 4:23 PM
To: elecraft@mailman.qth.net
Subject: [Elecraft] PTT KEY CONFIG setting volatile?

I notice the PTT KEY selection under CONFIG doesn't appear to be
non-volatile as when the radio is power cycled, it always reverts to
OFF - OFF.  I'd like it to stay set to DTR -- RTS but it doesn't

Even if I leave 13.8 to the radio, turning it OFF and back ON and
that setting reverts.

Ken

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Re: [Elecraft] PTT KEY CONFIG setting volatile?

[danny . higgins]

I have this on my K3S with the latest firmware. I use WSJT to key the K3S via 
the USB port and I operate in USB mode, not Data.  Every time I power the K3S 
OFF I need to reset the PTT Key config to DTR – OFF.

Danny, G3XVR


From: Vic Rosenthal 4X6GP/K2VCO
Sent: 23 May 2016 04:29
To: elecraft@mailman.qth.net
Subject: Re: [Elecraft] PTT KEY CONFIG setting volatile?

Which radio is it? I've never seen this on my K3.
If you are running some kind of rig control software, try it with the 
software not running.

73,
Vic, 4X6GP/K2VCO
Rehovot, Israel
http://www.qsl.net/k2vco/

On 23 May 2016 05:51, Ken Arck wrote:
> Sounds like a call to Elecraft tomorrow because this is repeatable!
>
>
>
>
> At 07:42 PM 5/22/2016, Cady, Fred wrote:
>> That doesn't sound right.  I don't think mine has ever changed.
>> Cheers,
>> Fred KE7X
>>
>> 
>> From: Elecraft  on behalf of Ken
>> Arck 
>> Sent: Sunday, May 22, 2016 4:23 PM
>> To: elecraft@mailman.qth.net
>> Subject: [Elecraft] PTT KEY CONFIG setting volatile?
>>
>> I notice the PTT KEY selection under CONFIG doesn't appear to be
>> non-volatile as when the radio is power cycled, it always reverts to
>> OFF - OFF.  I'd like it to stay set to DTR -- RTS but it doesn't
>>
>> Even if I leave 13.8 to the radio, turning it OFF and back ON and
>> that setting reverts.
>>
>> Ken
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Re: [Elecraft] To new KX2 owners

[Chris Tate - N6WM]

Wayne thanks for putting together this cool little rig and congrats on another 
successful release.  

I am heading to ZF2 next month and I am thinking this may be exactly what I 
need to go along for the ride.. :-).

Low profile 10 watts,  buddipole and tropical drink sounds very nice...  

Look for the antenna on 7-mile beach.

Chris
N6WM

-Original Message-
From: Elecraft [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Wayne 
Burdick
Sent: Saturday, May 21, 2016 7:05 PM
To: Elecraft Mailer ; k...@yahoogroups.com
Subject: [Elecraft] To new KX2 owners

Hi all,

If you were among those who scooped up (in record time) the KX2s we brought to 
Dayton: thanks for your enthusiastic response! (Wish we'd brought more :)

I know many of you have already unboxes the radios and are putting them on the 
air. If you have early questions or comments, feel free to send them to me 
directly, and/or post here. There are many knowledgable KX2 field testers 
lurking on our lists, including some top-flight SOTA operators. 

Trivia question: what's the closest SOTA peak to Hara Arena?

73,
Wayne
N6KR


http://www.elecraft.com
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Re: [Elecraft] PTT KEY CONFIG setting volatile?

[Vic Rosenthal 4X6GP/K2VCO]

Which radio is it? I've never seen this on my K3.
If you are running some kind of rig control software, try it with the 
software not running.


73,
Vic, 4X6GP/K2VCO
Rehovot, Israel
http://www.qsl.net/k2vco/

On 23 May 2016 05:51, Ken Arck wrote:

Sounds like a call to Elecraft tomorrow because this is repeatable!




At 07:42 PM 5/22/2016, Cady, Fred wrote:

That doesn't sound right.  I don't think mine has ever changed.
Cheers,
Fred KE7X


From: Elecraft  on behalf of Ken
Arck 
Sent: Sunday, May 22, 2016 4:23 PM
To: elecraft@mailman.qth.net
Subject: [Elecraft] PTT KEY CONFIG setting volatile?

I notice the PTT KEY selection under CONFIG doesn't appear to be
non-volatile as when the radio is power cycled, it always reverts to
OFF - OFF.  I'd like it to stay set to DTR -- RTS but it doesn't

Even if I leave 13.8 to the radio, turning it OFF and back ON and
that setting reverts.

Ken

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Re: [Elecraft] PTT KEY CONFIG setting volatile?

[Ken Arck]

Sounds like a call to Elecraft tomorrow because this is repeatable!




At 07:42 PM 5/22/2016, Cady, Fred wrote:

That doesn't sound right.  I don't think mine has ever changed.
Cheers,
Fred KE7X


From: Elecraft  on behalf of Ken 
Arck 

Sent: Sunday, May 22, 2016 4:23 PM
To: elecraft@mailman.qth.net
Subject: [Elecraft] PTT KEY CONFIG setting volatile?

I notice the PTT KEY selection under CONFIG doesn't appear to be
non-volatile as when the radio is power cycled, it always reverts to
OFF - OFF.  I'd like it to stay set to DTR -- RTS but it doesn't

Even if I leave 13.8 to the radio, turning it OFF and back ON and
that setting reverts.

Ken
--
President and CTO - Arcom Communications
Makers of repeater controllers and accessories.
http://www.arcomcontrollers.com/
Authorized Dealers for Kenwood and Telewave and
we offer complete repeater packages!
AH6LE/R - IRLP Node 3000
http://www.irlp.net
"We don't just make 'em. We use 'em!"

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--
President and CTO - Arcom Communications
Makers of repeater controllers and accessories.
http://www.arcomcontrollers.com/
Authorized Dealers for Kenwood and Telewave and
we offer complete repeater packages!
AH6LE/R - IRLP Node 3000
http://www.irlp.net
"We don't just make 'em. We use 'em!"

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Re: [Elecraft] PTT KEY CONFIG setting volatile?

[Cady, Fred]

That doesn't sound right.  I don't think mine has ever changed.
Cheers,
Fred KE7X


From: Elecraft  on behalf of Ken Arck 

Sent: Sunday, May 22, 2016 4:23 PM
To: elecraft@mailman.qth.net
Subject: [Elecraft] PTT KEY CONFIG setting volatile?

I notice the PTT KEY selection under CONFIG doesn't appear to be
non-volatile as when the radio is power cycled, it always reverts to
OFF - OFF.  I'd like it to stay set to DTR -- RTS but it doesn't

Even if I leave 13.8 to the radio, turning it OFF and back ON and
that setting reverts.

Ken
--
President and CTO - Arcom Communications
Makers of repeater controllers and accessories.
http://www.arcomcontrollers.com/
Authorized Dealers for Kenwood and Telewave and
we offer complete repeater packages!
AH6LE/R - IRLP Node 3000
http://www.irlp.net
"We don't just make 'em. We use 'em!"

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Re: [Elecraft] K3 Equalizer comment

[Richard Fjeld]

Yes, I have a narrow span like that programmed into one of the P3 
buttons for quick selection. His audio was centered around 500-600 Hz.  
Several guys with pan adapters ultimately tried to help him.  I signed 
off and let them work with him.  I heard him the next day and his audio 
was better but still room for improvement. Everyone had been giving him 
bad audio reports and he sounded choked up with disappointment. It is a 
new radio.  Enuf said about that.  We have it good.


Dick, n0ce


On 5/22/2016 2:32 PM, Fred Jensen wrote:
One of the first things I noticed after getting the P3 and poking 
around the phone bands was how frequently a station's audio was 
concentrated right next to the suppressed carrier.


K9YC helped me set my TX EQ, and the goal was to cut the lows [next to 
the carrier frequency] which consume a lot of the RF power and 
contribute little if anything to intelligibility.  With a 5 or 6 KHz 
span, the display is very striking and signals with a desirable 
spectrum seem to be a bit rare.


I don't frequent SSB very often, but when I do, usually in an NAQP or 
Sweepstakes, I regularly get unsolicited "Great audio" comments with 
Jim's settings.


73,

Fred K6DGW
- Northern California Contest Club
- CU in the Cal QSO Party 1-2 Oct 2016
- www.cqp.org



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Re: [Elecraft] K3 and KX3 questions for Wayne

[Milverton M. Swire via Elecraft]

>>> I don't mind having a KXPA100 delivering 100W under 12V power supply. <<<
Simple fix!    Apply ohms Law. 

(((73))) Milverton / W9MM. 


  From: Johnny Siu via Elecraft 
 To: Kevin Stover ; "elecraft@mailman.qth.net" 
 
 Sent: Sunday, May 22, 2016 7:46 PM
 Subject: [Elecraft] K3 and KX3 questions for Wayne
   
Hello Gentleman,
I met both Wayne and Eric in the past, they are thick skin and like questions 
right in front of their faces.  Some questions for them to address will give 
them more desire to do better.  In return, we are benefited.
Actually, I don't mind having a KXPA100 delivering 100W under 12V power supply. 
 Just leave Wayne free hands to Wayne to answer and I trust he is in a better 
position to do so.
73
Johnny VR2XMC

      寄件人︰ Kevin Stover 
 收件人︰ elecraft@mailman.qth.net 
 傳送日期︰ 2016年05月23日 (週一) 8:20 AM
 主題︰ Re: [Elecraft] K3 and KX3 questions for Wayne
  
Further down in the same online spec page it states "Compact unit ideal 
for both desktop and mobile use". Note *mobile* use where the electrical 
system supplies more than 13.8V with the engine running.
I find no mention of the KXPA100 being developed as a "portable" amp. I 
have done searches of all Elecraft docs concerning the KXPA100 and find 
NO mention of the word *portable* anywhere. Nor do I find any mention of 
some nefarious board swap early in the products life.

Maybe the OP assumed because it has a carry strap that it is a portable 
amp. Well...My TS520 has a carry strap and a DC-DC converter. No way 
that can be classified as portable, it weighs 37lbs.

To be fair I have run it at field day but we had a 10KW diesel powered 
generator on a trailer. Power was NOT and issue.

On 5/22/2016 4:46 PM, Jim Brown wrote:
> Michael,
>
> A careful reading of the online data sheet for the KXPA100 is 
> instructive here.
>
> http://www.elecraft.com/KXPA100/kxpa100.htm
>
> The first line says "100 watts at 13.8 V, 1.8 to 29.7 MHz and 80 watts 
> 50-54 MHz PEP CW/SSB/DATA; ± 1 dB"
>
> Two points: First, the amplifier is rated for 13.8V, NOT 12V. Second, 
> the rating is +/1 dB, which is +/- 20% power. Thus, 80W on the HF 
> bands is within spec for 13.8V at the amplifier terminals.
>
> The second line says "13.8 VDC powered; 20 A typical current drain (11 
> V with lower output. 15 V max)"
>
> This clearly means that the unit is designed and rated for 13.8VDC, 
> can be operated from 11V to 15VDC, and will have reduced output at 
> lower supply voltages.
>
> Obviously, Ohm's Law dictates that resistance of the DC supply 
> conductors will reduce power supply voltage at the amplifier 
> terminals, so while we may have 12V or 13.8V at our battery terminals, 
> the voltage at the end of 6-12 ft of cable will be a bit lower with a 
> 20A load. For example, the drop in 6 ft of #10 is 0.24v; for #12, it's 
> 0.38V, and for #14, it's 0.6V.
>
> As others have noted, the operating voltage in so-called 12V DC power 
> systems using lead-acid batteries is not 12V, but rather 13.8V. If you 
> buy an AC power supply for ham gear, it will likely leave the factory 
> with its voltage regulator set for 13.8V. Open the manual or the spec 
> sheet for nearly all ham gear and you will find the supply voltage 
> specified as 13.8VDC.
>
> 73, Jim K9YC

  
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Re: [Elecraft] K3 and KX3 questions for Wayne

[David Orman]

While I appreciate the motivation behind your request, you should have
asked Wayne directly, and not via an email list sent to hundreds
(thousands?) of users. If you did not want community replies, you should
not have sent an email to a community mailing list.

On Sun, May 22, 2016 at 1:46 PM, N6MQL  wrote:

> Although I appreciate all of your answers I specifically asked these
> questions of Wayne because I was making a point to let him know of my
> disapproval of the fact that the KXPA100 amp is incapable of running a full
> 100 watts on a standard 12v battery. Furthermore I was trying to get an
> explanation from the head designer as to why my amp that has a 30amp power
> supply at 15v (read on the KX3) or 15.4v at the input is unable to transmit
> at a full 100 watts on all bands.  Yes, I have the supplied cable with
> fuses attached, it's only 3 feet long, and the transmit vs' receive voltage
> is less than a volt difference.  So all of those bases have been covered.
> As noted I have also completed the KX3 power configuration, and the KX3 to
> KPA matching alignment procedure...
> I was alluded to the idea that there were a second revision of boards that
> came out for the KXPA100 after the early models were shipped.  I have also
> heard that those boards help increase the output power. Therefore I was
> asking WAYNE if this were the case, and perhaps having them would help this
> situation. As for the 12v not running the amp, this IS an issue because at
> field day we have 150 Ah batteries that run 12 volts, and it would be nice
> to have my 100 watt amp run a full 100 watts. Again, this was designed as a
> portable amp. I would expect that at 12v we should be able to get the full
> rating out of it.
>
> On another note, what may have also gotten lost due to all those trying to
> be helpful, but cluttering my original post.  I have a K3 that no longer
> puts out 100 watts on 17 meters but does on all other bands.  I was told
> this was a software issue by Tech Support.  I would like confirmation FROM
> WAYNE that this is the case, and when he may have time to address it. If
> not, I would like to know why I was told this.
>
> So again, as much as I appreciate all of you trying to help with these
> questions, I would much prefer that Wayne address them personally.  Thank
> you,
>
> --
> Michael
>
> N6MQL
>
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[Elecraft] K3 and KX3 questions for Wayne

[Johnny Siu via Elecraft]

Hello Gentleman,
I met both Wayne and Eric in the past, they are thick skin and like questions 
right in front of their faces.  Some questions for them to address will give 
them more desire to do better.  In return, we are benefited.
Actually, I don't mind having a KXPA100 delivering 100W under 12V power supply. 
 Just leave Wayne free hands to Wayne to answer and I trust he is in a better 
position to do so.
73
Johnny VR2XMC

  寄件人︰ Kevin Stover 
 收件人︰ elecraft@mailman.qth.net 
 傳送日期︰ 2016年05月23日 (週一) 8:20 AM
 主題︰ Re: [Elecraft] K3 and KX3 questions for Wayne
   
Further down in the same online spec page it states "Compact unit ideal 
for both desktop and mobile use". Note *mobile* use where the electrical 
system supplies more than 13.8V with the engine running.
I find no mention of the KXPA100 being developed as a "portable" amp. I 
have done searches of all Elecraft docs concerning the KXPA100 and find 
NO mention of the word *portable* anywhere. Nor do I find any mention of 
some nefarious board swap early in the products life.

Maybe the OP assumed because it has a carry strap that it is a portable 
amp. Well...My TS520 has a carry strap and a DC-DC converter. No way 
that can be classified as portable, it weighs 37lbs.

To be fair I have run it at field day but we had a 10KW diesel powered 
generator on a trailer. Power was NOT and issue.

On 5/22/2016 4:46 PM, Jim Brown wrote:
> Michael,
>
> A careful reading of the online data sheet for the KXPA100 is 
> instructive here.
>
> http://www.elecraft.com/KXPA100/kxpa100.htm
>
> The first line says "100 watts at 13.8 V, 1.8 to 29.7 MHz and 80 watts 
> 50-54 MHz PEP CW/SSB/DATA; ± 1 dB"
>
> Two points: First, the amplifier is rated for 13.8V, NOT 12V. Second, 
> the rating is +/1 dB, which is +/- 20% power. Thus, 80W on the HF 
> bands is within spec for 13.8V at the amplifier terminals.
>
> The second line says "13.8 VDC powered; 20 A typical current drain (11 
> V with lower output. 15 V max)"
>
> This clearly means that the unit is designed and rated for 13.8VDC, 
> can be operated from 11V to 15VDC, and will have reduced output at 
> lower supply voltages.
>
> Obviously, Ohm's Law dictates that resistance of the DC supply 
> conductors will reduce power supply voltage at the amplifier 
> terminals, so while we may have 12V or 13.8V at our battery terminals, 
> the voltage at the end of 6-12 ft of cable will be a bit lower with a 
> 20A load. For example, the drop in 6 ft of #10 is 0.24v; for #12, it's 
> 0.38V, and for #14, it's 0.6V.
>
> As others have noted, the operating voltage in so-called 12V DC power 
> systems using lead-acid batteries is not 12V, but rather 13.8V. If you 
> buy an AC power supply for ham gear, it will likely leave the factory 
> with its voltage regulator set for 13.8V. Open the manual or the spec 
> sheet for nearly all ham gear and you will find the supply voltage 
> specified as 13.8VDC.
>
> 73, Jim K9YC

  
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Re: [Elecraft] [RESOLVED] Audio via USB for the K3S?

[Tony Estep]

On Sun, May 22, 2016 at 7:26 PM, Bob Darlington 
wrote:

> You definitely do NOT need to be in data mode.  I've never switched to
> data...
>

Correct. You can transmit and receive data just fine in SSB mode. It's good
that you fixed your problem, but that wasn't it.

Tony KT0NY
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Re: [Elecraft] [RESOLVED] Audio via USB for the K3S?

[Bob Darlington]

You definitely do NOT need to be in data mode.  I've never switched to data
and do PSK31 every day on a K3S.

"LINE" level set high enough (mine is around 10-13)
"MIC SEL" set to LINE IN.
You'll also need to make sure the USB Codec sound input/output levels are
set on your computer to levels that work.  Start with each slider mid way
to get into the ballpark and adjust from there.

There's a way to do both front mic and line in (internal sound card) but I
would pick up my keyboard with the mic.  A couple of macros later and I
have a button for phone and a button for digital that changes settings
appropriately.

-Bob N3XKB

On Sat, May 21, 2016 at 10:09 AM, Ken Arck  wrote:

> Well..it seems the only way for the USB audio from computer > radio to
> work is for radio to be in DATA mode.Duh..
>
> Thanks to all who responded
>
>
>
> Ken
>
> --
> President and CTO - Arcom Communications
> Makers of repeater controllers and accessories.
> http://www.arcomcontrollers.com/
> Authorized Dealers for Kenwood and Telewave and
> we offer complete repeater packages!
> AH6LE/R - IRLP Node 3000
> http://www.irlp.net
> "We don't just make 'em. We use 'em!"
>
> __
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
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>
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Re: [Elecraft] K3 and KX3 questions for Wayne

[Kevin Stover]

Further down in the same online spec page it states "Compact unit ideal 
for both desktop and mobile use". Note *mobile* use where the electrical 
system supplies more than 13.8V with the engine running.
I find no mention of the KXPA100 being developed as a "portable" amp. I 
have done searches of all Elecraft docs concerning the KXPA100 and find 
NO mention of the word *portable* anywhere. Nor do I find any mention of 
some nefarious board swap early in the products life.


Maybe the OP assumed because it has a carry strap that it is a portable 
amp. Well...My TS520 has a carry strap and a DC-DC converter. No way 
that can be classified as portable, it weighs 37lbs.


To be fair I have run it at field day but we had a 10KW diesel powered 
generator on a trailer. Power was NOT and issue.


On 5/22/2016 4:46 PM, Jim Brown wrote:

Michael,

A careful reading of the online data sheet for the KXPA100 is 
instructive here.


http://www.elecraft.com/KXPA100/kxpa100.htm

The first line says "100 watts at 13.8 V, 1.8 to 29.7 MHz and 80 watts 
50-54 MHz PEP CW/SSB/DATA; ± 1 dB"


Two points: First, the amplifier is rated for 13.8V, NOT 12V. Second, 
the rating is +/1 dB, which is +/- 20% power. Thus, 80W on the HF 
bands is within spec for 13.8V at the amplifier terminals.


The second line says "13.8 VDC powered; 20 A typical current drain (11 
V with lower output. 15 V max)"


This clearly means that the unit is designed and rated for 13.8VDC, 
can be operated from 11V to 15VDC, and will have reduced output at 
lower supply voltages.


Obviously, Ohm's Law dictates that resistance of the DC supply 
conductors will reduce power supply voltage at the amplifier 
terminals, so while we may have 12V or 13.8V at our battery terminals, 
the voltage at the end of 6-12 ft of cable will be a bit lower with a 
20A load. For example, the drop in 6 ft of #10 is 0.24v; for #12, it's 
0.38V, and for #14, it's 0.6V.


As others have noted, the operating voltage in so-called 12V DC power 
systems using lead-acid batteries is not 12V, but rather 13.8V. If you 
buy an AC power supply for ham gear, it will likely leave the factory 
with its voltage regulator set for 13.8V. Open the manual or the spec 
sheet for nearly all ham gear and you will find the supply voltage 
specified as 13.8VDC.


73, Jim K9YC
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--
R. Kevin Stover
AC0H
ARRL
FISTS #11993
SKCC #215
NAQCC #3441



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Re: [Elecraft] Elecraft Digest, Vol 145, Issue 27

[Doug Millar via Elecraft]

The new KX2 looks really exciting. Can anyone come up with a picture of the 
insides?  Doug K6JEY

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Re: [Elecraft] K3 and KX3 questions for Wayne

[Mike Rhodes]

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[Elecraft] FS: N8BX VFO knobs NIB

[dlrwild1]

FS: NIB N8BX VFO A/B knobs black power coated with aluminum inserts for K3/K3S. 
Sold my K3/100. Plans changed, no longer needed. Contact Bob,  K3SRO at 
dlrwi...@verizon.net
ASKING: $150 with S/H
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[Elecraft] KX2

[David Smith]

Just home from Dayton and getting ready to get my KX2 on the air I purchased
at Dayton.  Looking forward to the comments when everyone gets theirs on the
the air.   Thanks Wayne, Eric and the Elecraft team for the new product and
your support.  Looking at  several locations now to activate SOTA in my area
and get my ATV/side by side out in the mountains again.  Nice to combine 2
hobbies I have a passion for.

 

David, ND4Y



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[Elecraft] PTT KEY CONFIG setting volatile?

[Ken Arck]

I notice the PTT KEY selection under CONFIG doesn't appear to be 
non-volatile as when the radio is power cycled, it always reverts to 
OFF - OFF.  I'd like it to stay set to DTR -- RTS but it doesn't


Even if I leave 13.8 to the radio, turning it OFF and back ON and 
that setting reverts.


Ken
--
President and CTO - Arcom Communications
Makers of repeater controllers and accessories.
http://www.arcomcontrollers.com/
Authorized Dealers for Kenwood and Telewave and
we offer complete repeater packages!
AH6LE/R - IRLP Node 3000
http://www.irlp.net
"We don't just make 'em. We use 'em!"

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Re: [Elecraft] K3 and KX3 questions for Wayne

[Jim Brown]

On Sun,5/22/2016 11:46 AM, N6MQL wrote:
Although I appreciate all of your answers I specifically asked these 
questions of Wayne because I was making a point to let him know of my 
disapproval of the fact that the KXPA100 amp is incapable of running a 
full 100 watts on a standard 12v battery.


Michael,

A careful reading of the online data sheet for the KXPA100 is 
instructive here.


http://www.elecraft.com/KXPA100/kxpa100.htm

The first line says "100 watts at 13.8 V, 1.8 to 29.7 MHz and 80 watts 
50-54 MHz PEP CW/SSB/DATA; ± 1 dB"


Two points: First, the amplifier is rated for 13.8V, NOT 12V. Second, 
the rating is +/1 dB, which is +/- 20% power. Thus, 80W on the HF bands 
is within spec for 13.8V at the amplifier terminals.


The second line says "13.8 VDC powered; 20 A typical current drain (11 V 
with lower output. 15 V max)"


This clearly means that the unit is designed and rated for 13.8VDC, can 
be operated from 11V to 15VDC, and will have reduced output at lower 
supply voltages.


Obviously, Ohm's Law dictates that resistance of the DC supply 
conductors will reduce power supply voltage at the amplifier terminals, 
so while we may have 12V or 13.8V at our battery terminals, the voltage 
at the end of 6-12 ft of cable will be a bit lower with a 20A load. For 
example, the drop in 6 ft of #10 is 0.24v; for #12, it's 0.38V, and for 
#14, it's 0.6V.


As others have noted, the operating voltage in so-called 12V DC power 
systems using lead-acid batteries is not 12V, but rather 13.8V. If you 
buy an AC power supply for ham gear, it will likely leave the factory 
with its voltage regulator set for 13.8V. Open the manual or the spec 
sheet for nearly all ham gear and you will find the supply voltage 
specified as 13.8VDC.


73, Jim K9YC
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Re: [Elecraft] K3 and KX3 questions for Wayne

[Kevin Stover]

You do know what's going on this weekend right?
I'm sure once he is back from Dayton he will give your questions all of 
they attention they deserve.

What sort of watt meter are we measuring the output with?

On 5/22/2016 1:46 PM, N6MQL wrote:
Although I appreciate all of your answers I specifically asked these 
questions of Wayne because I was making a point to let him know of my 
disapproval of the fact that the KXPA100 amp is incapable of running a 
full 100 watts on a standard 12v battery. Furthermore I was trying to 
get an explanation from the head designer as to why my amp that has a 
30amp power supply at 15v (read on the KX3) or 15.4v at the input is 
unable to transmit at a full 100 watts on all bands.  Yes, I have the 
supplied cable with fuses attached, it's only 3 feet long, and the 
transmit vs' receive voltage is less than a volt difference.  So all 
of those bases have been covered. As noted I have also completed the 
KX3 power configuration, and the KX3 to KPA matching alignment 
procedure...
I was alluded to the idea that there were a second revision of boards 
that came out for the KXPA100 after the early models were shipped.  I 
have also heard that those boards help increase the output power. 
Therefore I was asking WAYNE if this were the case, and perhaps having 
them would help this situation. As for the 12v not running the amp, 
this IS an issue because at field day we have 150 Ah batteries that 
run 12 volts, and it would be nice to have my 100 watt amp run a full 
100 watts. Again, this was designed as a portable amp. I would expect 
that at 12v we should be able to get the full rating out of it.


On another note, what may have also gotten lost due to all those 
trying to be helpful, but cluttering my original post.  I have a K3 
that no longer puts out 100 watts on 17 meters but does on all other 
bands.  I was told this was a software issue by Tech Support.  I would 
like confirmation FROM WAYNE that this is the case, and when he may 
have time to address it. If not, I would like to know why I was told 
this.


So again, as much as I appreciate all of you trying to help with these 
questions, I would much prefer that Wayne address them personally.  
Thank you,





--
R. Kevin Stover
AC0H
ARRL
FISTS #11993
SKCC #215
NAQCC #3441



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Re: [Elecraft] K3 and KX3 questions for Wayne

[Ron D'Eau Claire]

Actually it is a good measurement when the KXPA100 and KX3 are set up
'normally' with power to the KX3 supplied via the KXPA100.

What the KX3 will display is the voltage present at the input to the KXPA100
(because that's where the KX3 is getting its power) less any voltage drop in
the cable from the KXPA100 to the KX3.

So if the voltage reads good at the KX3 with that setup, it's good at the
KXPA100. 

73, Ron AC7AC 

-Original Message-
From: Elecraft [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Ken G
Kopp
Sent: Sunday, May 22, 2016 10:53 AM
To: Nr4c; elecraft@mailman.qth.net
Subject: Re: [Elecraft] K3 and KX3 questions for Wayne

Bill,

The front panel voltage display on a KX3 will -not- be accurate for the
voltage at the input- power connector of the KXPA100.
This voltage must be measured AT THE CONNECTOR on the rear of the KXPA100 to
know what's being delivered to the PA.

73!

K0PP

On Sun, May 22, 2016 at 9:40 AM, Nr4c  wrote:

> Or just use the Voltage reading displayed on the K3/KX3 front panel. 
> It's quite accurate.
>
> Sent from my iPhone
> ...nr4c. bill
>
>
> > On May 22, 2016, at 10:52 AM, David Orman  wrote:
> >
> > Another question - how long/what gauge is the wire running to your
> KXPA100?
> > I wouldn't expect enough drop to pull your voltage down to a point 
> > at
> which
> > it cuts back power, but you never know. Check your KX3 for the 
> > source voltage when transmitting, that'll tell you if you're 
> > dropping below the threshold for power reduction. For example, 16 
> > gauge copper will drop
> about
> > 1.2 volts on a 10 foot run @ 15A current draw.
> >
> >> On Sat, May 21, 2016 at 9:58 PM, N6MQL  wrote:
> >>
> >> Wayne,
> >>
> >> 2 things... First I mentioned to David S in the service department 
> >> that the K3 is no longer transmitting more than 94 watts out on 17 
> >> meters regardless of the SWR/ impedance. David said that this was a 
> >> known issue due to software and that it was being worked on. 
> >> However I haven't seen anything about this issue so I'm wondering 
> >> if this is true and if so has there been any updates to fix it.
> >> Secondly, I'm noticing that my KXPA100 can not produce more that 80
> watts
> >> on most bands and 60 on others when I don't supply it with as much 
> >> as
> 15v
> >> DC on a 30 amp supply. This after I did the KX3 / KPXA calibration 
> >> procedure. Why is it that a "mobile" amp that would normally be 
> >> powered with 12v DC from a car battery not be able to provide the 
> >> power output
> that
> >> it is sold as (100 watts)?. Has there been some kind of revisions 
> >> to the first run boards that I should be exchanging them with?
> >>
> >> Thank you for your answers  73
> >>
> >> Mike
> >> N6MQL
> >> __
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> >> orma...@corenode.com
> >>
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Re: [Elecraft] K3 Equalizer comment

[Fred Jensen]

One of the first things I noticed after getting the P3 and poking around 
the phone bands was how frequently a station's audio was concentrated 
right next to the suppressed carrier.


K9YC helped me set my TX EQ, and the goal was to cut the lows [next to 
the carrier frequency] which consume a lot of the RF power and 
contribute little if anything to intelligibility.  With a 5 or 6 KHz 
span, the display is very striking and signals with a desirable spectrum 
seem to be a bit rare.


I don't frequent SSB very often, but when I do, usually in an NAQP or 
Sweepstakes, I regularly get unsolicited "Great audio" comments with 
Jim's settings.


73,

Fred K6DGW
- Northern California Contest Club
- CU in the Cal QSO Party 1-2 Oct 2016
- www.cqp.org

On 5/21/2016 9:33 PM, Richard Fjeld wrote:

By looking at how his signal filled out the voice band in the waterfall,
and also the pattern of it on the display.  It is a crude test using a
person's voice. Audio reports were the final test. He wasn't able to
adjust it by monitoring his own voice.

It would be better if the transmitting station had something like an  AF
generator audibly coupled to the microphone to do a freq run within the
voice band at a constant audio level.

Dick, n0ce

On 5/21/2016 9:01 PM, Jim Brown wrote:

On Sat,5/21/2016 7:54 AM, Richard Fjeld wrote:

I was asked to help a ham get the transmit audio on his new import
equalized.  What an experience!


How did you use the P3 to do this?

73, Jim K9YC


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Re: [Elecraft] K3 and KX3 questions for Wayne

[N6MQL]

Although I appreciate all of your answers I specifically asked these 
questions of Wayne because I was making a point to let him know of my 
disapproval of the fact that the KXPA100 amp is incapable of running a 
full 100 watts on a standard 12v battery. Furthermore I was trying to 
get an explanation from the head designer as to why my amp that has a 
30amp power supply at 15v (read on the KX3) or 15.4v at the input is 
unable to transmit at a full 100 watts on all bands.  Yes, I have the 
supplied cable with fuses attached, it's only 3 feet long, and the 
transmit vs' receive voltage is less than a volt difference.  So all of 
those bases have been covered. As noted I have also completed the KX3 
power configuration, and the KX3 to KPA matching alignment procedure...
I was alluded to the idea that there were a second revision of boards 
that came out for the KXPA100 after the early models were shipped.  I 
have also heard that those boards help increase the output power. 
Therefore I was asking WAYNE if this were the case, and perhaps having 
them would help this situation. As for the 12v not running the amp, this 
IS an issue because at field day we have 150 Ah batteries that run 12 
volts, and it would be nice to have my 100 watt amp run a full 100 
watts. Again, this was designed as a portable amp. I would expect that 
at 12v we should be able to get the full rating out of it.


On another note, what may have also gotten lost due to all those trying 
to be helpful, but cluttering my original post.  I have a K3 that no 
longer puts out 100 watts on 17 meters but does on all other bands.  I 
was told this was a software issue by Tech Support.  I would like 
confirmation FROM WAYNE that this is the case, and when he may have time 
to address it. If not, I would like to know why I was told this.


So again, as much as I appreciate all of you trying to help with these 
questions, I would much prefer that Wayne address them personally.  
Thank you,


--
Michael
N6MQL

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[Elecraft] Elecraft CW Net Announcement

[kev...@coho.net]

After a cold, wet week at least the propagation has marginally 
improved.  A new Elecraft rig was announced on Wednesday.  It looks like 
a good fit for those of us who work a little radio into our hiking, 
canoeing,  or XC skiing sojourns.  I was reading history (which I am 
wont to do) and found a QRP rig circa 1965. It was interesting to 
compare Elecraft's new rig with this design : 
http://www.militaryradio.com/spyradio/delco5300.html.  How things have 
changed!


Please join us on:
14050 kHz at 2200z Sunday (3 PM PDT Sunday)
 7045 kHz at 0100z Monday (6 PM PDT Sunday)

   73,
Kevin.  KD5ONS

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[Elecraft] sub files

[Ed Hoeck]

I keep getting the error message from Spot Collector that the file
BandModes.txt does not exist how do I correct this problem.
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[Elecraft] Tuneup, Rescue, build your K2, K1, KX1, others

[Alan D. Wilcox]

Hello,

Have you always wanted an Elecraft? A KX1, K1, K2, K3, whatever? 
Does your K2 need a tuneup?
I build and service them all!

See what my clients have said about my construction and service work at 
http://www.eham.net/reviews/detail/6768 


Photos of the popular "Twins" -- the KPA100 and KAT100 in EC2 enclosure --  are 
at
http://wilcoxengineering.com/kpa100-in-ec2/ 


In addition to tuning your rig, I can also rescue a building project you might 
have started some time ago.

Cheers,
Alan

Alan D. Wilcox, W3DVX (K2-5373, K3-40)
570-478-0736 (cell, text)
http://amazon.com/author/alandwilcox
Williamsport, PA 17701 

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Re: [Elecraft] K3 and KX3 questions for Wayne

[Walter Underwood]

According to the manual, you can use the KXPA Utility to read the voltmeter 
inside the KXPA100.

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

> On May 22, 2016, at 10:52 AM, Ken G Kopp  wrote:
> 
> Bill,
> 
> The front panel voltage display on a KX3 will -not- be accurate
> for the voltage at the input- power connector of the KXPA100.
> This voltage must be measured AT THE CONNECTOR on the
> rear of the KXPA100 to know what's being delivered to the PA.
> 
> 73!
> 
> K0PP
> 
> On Sun, May 22, 2016 at 9:40 AM, Nr4c  wrote:
> 
>> Or just use the Voltage reading displayed on the K3/KX3 front panel. It's
>> quite accurate.
>> 
>> Sent from my iPhone
>> ...nr4c. bill
>> 
>> 
>>> On May 22, 2016, at 10:52 AM, David Orman  wrote:
>>> 
>>> Another question - how long/what gauge is the wire running to your
>> KXPA100?
>>> I wouldn't expect enough drop to pull your voltage down to a point at
>> which
>>> it cuts back power, but you never know. Check your KX3 for the source
>>> voltage when transmitting, that'll tell you if you're dropping below the
>>> threshold for power reduction. For example, 16 gauge copper will drop
>> about
>>> 1.2 volts on a 10 foot run @ 15A current draw.
>>> 
 On Sat, May 21, 2016 at 9:58 PM, N6MQL  wrote:
 
 Wayne,
 
 2 things... First I mentioned to David S in the service department that
 the K3 is no longer transmitting more than 94 watts out on 17 meters
 regardless of the SWR/ impedance. David said that this was a known issue
 due to software and that it was being worked on. However I haven't seen
 anything about this issue so I'm wondering if this is true and if so has
 there been any updates to fix it.
 Secondly, I'm noticing that my KXPA100 can not produce more that 80
>> watts
 on most bands and 60 on others when I don't supply it with as much as
>> 15v
 DC on a 30 amp supply. This after I did the KX3 / KPXA calibration
 procedure. Why is it that a "mobile" amp that would normally be powered
 with 12v DC from a car battery not be able to provide the power output
>> that
 it is sold as (100 watts)?. Has there been some kind of revisions to the
 first run boards that I should be exchanging them with?
 
 Thank you for your answers  73
 
 Mike
 N6MQL
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Re: [Elecraft] K3 and KX3 questions for Wayne

[Ken G Kopp]

Bill,

The front panel voltage display on a KX3 will -not- be accurate
for the voltage at the input- power connector of the KXPA100.
This voltage must be measured AT THE CONNECTOR on the
rear of the KXPA100 to know what's being delivered to the PA.

73!

K0PP

On Sun, May 22, 2016 at 9:40 AM, Nr4c  wrote:

> Or just use the Voltage reading displayed on the K3/KX3 front panel. It's
> quite accurate.
>
> Sent from my iPhone
> ...nr4c. bill
>
>
> > On May 22, 2016, at 10:52 AM, David Orman  wrote:
> >
> > Another question - how long/what gauge is the wire running to your
> KXPA100?
> > I wouldn't expect enough drop to pull your voltage down to a point at
> which
> > it cuts back power, but you never know. Check your KX3 for the source
> > voltage when transmitting, that'll tell you if you're dropping below the
> > threshold for power reduction. For example, 16 gauge copper will drop
> about
> > 1.2 volts on a 10 foot run @ 15A current draw.
> >
> >> On Sat, May 21, 2016 at 9:58 PM, N6MQL  wrote:
> >>
> >> Wayne,
> >>
> >> 2 things... First I mentioned to David S in the service department that
> >> the K3 is no longer transmitting more than 94 watts out on 17 meters
> >> regardless of the SWR/ impedance. David said that this was a known issue
> >> due to software and that it was being worked on. However I haven't seen
> >> anything about this issue so I'm wondering if this is true and if so has
> >> there been any updates to fix it.
> >> Secondly, I'm noticing that my KXPA100 can not produce more that 80
> watts
> >> on most bands and 60 on others when I don't supply it with as much as
> 15v
> >> DC on a 30 amp supply. This after I did the KX3 / KPXA calibration
> >> procedure. Why is it that a "mobile" amp that would normally be powered
> >> with 12v DC from a car battery not be able to provide the power output
> that
> >> it is sold as (100 watts)?. Has there been some kind of revisions to the
> >> first run boards that I should be exchanging them with?
> >>
> >> Thank you for your answers  73
> >>
> >> Mike
> >> N6MQL
> >> __
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Re: [Elecraft] K3 and KX3 questions for Wayne

[Art Nienhouse]

*/My experience with my KXPA-100 that the power output would not ever 
get to the advertised 100 watts on 40 meters using the supplied power 
cable that came with my kit was worse.


Even after setting the 45 amp power supply to the highest out put it 
would do, the radio reported 13.8 volts on receive, on key down it would 
drop well below ( on some bands ) to 12 volts.


After replacing the pwr cable with a 10 gauge wire the supply reported 
at the radio is 14.5 rx, tx is 13.8 the power output is at 100 watts 
most bands 110 on one band and the only band I really care about is 40 
where it always has been below the other bands is now at 99 to 100 watts.


I believe that there was a firmware update that made this issue worse as 
it was at one time doing around 80 to 85 watts on 40 meters which I was 
living with, most other bands 100 to 110 watts,  using the supplied 
power cable that came with my kit.


If its sold as a mobile amp then it should be capable of doing the 
advertised 100 watts at 12 volts ..( I know the advertizing 
stated at 13.8 volts ) ..to achieve the 100 watts.


To be completely truthful it should be stated what can be expected for 
power out at 12 v connected to a car deep cycle battery with the 
supplied power cable...mine did 60 watts on 40 meters with the latest 
bata firmware.


At the very least a ( quality 10 gauge power cable ) should be supplied 
with the amp, and all 100 watt output radios.
I took the advice of this group to purchase Powerwerx Red/Black power 
cable  not the cheapest however quality is very good.

With my power supply set to 14.4 volts I get the advertized 100 watts now.

Regards
Art
ka9zap
/*
On 5/21/2016 9:58 PM, N6MQL wrote:

Wayne,

2 things... First I mentioned to David S in the service department that the K3 
is no longer transmitting more than 94 watts out on 17 meters regardless of the 
SWR/ impedance. David said that this was a known issue due to software and that 
it was being worked on. However I haven't seen anything about this issue so I'm 
wondering if this is true and if so has there been any updates to fix it.
Secondly, I'm noticing that my KXPA100 can not produce more that 80 watts on most bands 
and 60 on others when I don't supply it with as much as 15v DC on a 30 amp supply. This 
after I did the KX3 / KPXA calibration procedure. Why is it that a "mobile" amp 
that would normally be powered with 12v DC from a car battery not be able to provide the 
power output that it is sold as (100 watts)?. Has there been some kind of revisions to 
the first run boards that I should be exchanging them with?

Thank you for your answers  73

Mike
N6MQL
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[Elecraft] [KX2] To new KX2 owners

[a...@juno.com]

I'm glad you left some back in Aptos so that us stay-at-homes had stock from 
which to order :-)

John AE5X
http://ae5x.blogspot.com/


 _ 

>If you were among those who scooped up (in record time) the KX2s we brought to 
>Dayton: thanks for your enthusiastic response! (Wish we'd brought more :)

The New York Times
Finding Love Again, This Time With A Man
http://thirdpartyoffers.juno.com/TGL3131/5741d8ef922e758ef57a0st03vuc
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Re: [Elecraft] K3 and KX3 questions for Wayne

[Bob N3MNT]

I noticed that my KXPA100 output was a little low so I checked the output of
my 30A supply.  It was a little low.  I adjusted it up from 13.6V to 14.0
and all is well.



--
View this message in context: 
http://elecraft.365791.n2.nabble.com/K3-and-KX3-questions-for-Wayne-tp7617739p7617749.html
Sent from the Elecraft mailing list archive at Nabble.com.
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Re: [Elecraft] K3 and KX3 questions for Wayne

[Nr4c]

Or just use the Voltage reading displayed on the K3/KX3 front panel. It's quite 
accurate. 

Sent from my iPhone
...nr4c. bill


> On May 22, 2016, at 10:52 AM, David Orman  wrote:
> 
> Another question - how long/what gauge is the wire running to your KXPA100?
> I wouldn't expect enough drop to pull your voltage down to a point at which
> it cuts back power, but you never know. Check your KX3 for the source
> voltage when transmitting, that'll tell you if you're dropping below the
> threshold for power reduction. For example, 16 gauge copper will drop about
> 1.2 volts on a 10 foot run @ 15A current draw.
> 
>> On Sat, May 21, 2016 at 9:58 PM, N6MQL  wrote:
>> 
>> Wayne,
>> 
>> 2 things... First I mentioned to David S in the service department that
>> the K3 is no longer transmitting more than 94 watts out on 17 meters
>> regardless of the SWR/ impedance. David said that this was a known issue
>> due to software and that it was being worked on. However I haven't seen
>> anything about this issue so I'm wondering if this is true and if so has
>> there been any updates to fix it.
>> Secondly, I'm noticing that my KXPA100 can not produce more that 80 watts
>> on most bands and 60 on others when I don't supply it with as much as 15v
>> DC on a 30 amp supply. This after I did the KX3 / KPXA calibration
>> procedure. Why is it that a "mobile" amp that would normally be powered
>> with 12v DC from a car battery not be able to provide the power output that
>> it is sold as (100 watts)?. Has there been some kind of revisions to the
>> first run boards that I should be exchanging them with?
>> 
>> Thank you for your answers  73
>> 
>> Mike
>> N6MQL
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Re: [Elecraft] K3 and KX3 questions for Wayne

[David Orman]

Another question - how long/what gauge is the wire running to your KXPA100?
I wouldn't expect enough drop to pull your voltage down to a point at which
it cuts back power, but you never know. Check your KX3 for the source
voltage when transmitting, that'll tell you if you're dropping below the
threshold for power reduction. For example, 16 gauge copper will drop about
1.2 volts on a 10 foot run @ 15A current draw.

On Sat, May 21, 2016 at 9:58 PM, N6MQL  wrote:

> Wayne,
>
> 2 things... First I mentioned to David S in the service department that
> the K3 is no longer transmitting more than 94 watts out on 17 meters
> regardless of the SWR/ impedance. David said that this was a known issue
> due to software and that it was being worked on. However I haven't seen
> anything about this issue so I'm wondering if this is true and if so has
> there been any updates to fix it.
> Secondly, I'm noticing that my KXPA100 can not produce more that 80 watts
> on most bands and 60 on others when I don't supply it with as much as 15v
> DC on a 30 amp supply. This after I did the KX3 / KPXA calibration
> procedure. Why is it that a "mobile" amp that would normally be powered
> with 12v DC from a car battery not be able to provide the power output that
> it is sold as (100 watts)?. Has there been some kind of revisions to the
> first run boards that I should be exchanging them with?
>
> Thank you for your answers  73
>
> Mike
> N6MQL
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[Elecraft] SP-3 Speakers SOLD

[Steve Ellington]

They're gone.
Thanks to the multitude who replied!
N4LQ
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[Elecraft] For sale P3-SVGA-Monitor

[George Rebong]

Selling my Elecraft P3 High performance Panadaptor with P3SVGA Video Adapter 
and P3TXMON TX Monitor Power and Waveform Display Adapter with
DCHF-2000 1.8-54 MHz, 1- 2000W HF 2000W Max directional coupler.
$950 includes shipping to CONUS. Non Smoker. Paypal or USPS money order. George 
KE6TE Call 916-600-2717.

Sent from my iPad
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[Elecraft] Elecraft Weekly SSB Net

[John W Webster]

Please consider joining us for the weekly Sunday Elecraft SSB net on 20m.

Time:  18:00z (UTC)  11am Pacific; 2pm Eastern
Frequency:  14.303.5 

We would love to have the first KX2 checkin from wherever you are (Dayton even!)

Current net control, Eric WB9JNZ sent the following list of check-ins over the 
last
two weeks with particularly difficult propagation.

73

John, N6JW

Elecraft Net 5-15-16

WB9JNZ Eric IL K3 4017 Net Control NSRC CLUB MEMBER

W4RKS Jim TX K3 3618

KG5ABW Ed MI Yaesu ft 1200 1st time check in

W8OV Dave TX K3 3139

N9TF Gene IL K3S 10057

N6JW John CA K3 936

K5ZCJ Larry OK K3S 10032

NC0JW Jim CO K3 1356

K1NW Brian RI K3 4974

KC9USC Robert IL KX3 4460 NSRC CLUB MEMBER

KK6DA David CA K3S 10125

W4DML Doug TN K3 6433

NS7P Phil OR K3 1826

K6WDE Dave CA KX3 4599

W0CZ Ken ND K3S 10329

W7QHD Kurt AZ K2 1538

N9DC/M Maurice IN IC 7000

WM6P Steve GA K3 8133

KE7HGE Ken WA KX3 4540 QRP

N4NRW Roger SC K3 1318

K7BRR Bill AZ K3 5545

VA7ZOO Bill BC KX3 3035 QRP

K6VDN John NV KX3 8046



Elecraft Net 5-8-16

WB9JNZ Eric IL K3 4017 Net Control

NM7J Steve NV K3 2105

K5ZCJ Larry OK K3S 10032

NC0JW Jim CO K3 1356

WB5JJA Ray OK K3 7877

W7SNR Bob AZ K3 343

W2RWA Dick NY K3 2603

KK6DA David CA K3S 10125

W4RKS Jim TX K3 3618

N6JW John CA K3 936

KD6SBK Bruce AZ FT 857

W7QHD Kurt AZ K2 1538

AE7MX August AZ unknown radio

N9SRA Steve IL K3S 10563 NSRC CLUB MEMBER

K6WDE Dave CA KX3 4599

K7BRR Bill AZ K3 5545
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Re: [Elecraft] K2 PA Failures and Remote Antenna Switch

[Josh Fiden]

Hi Ted,

I see that you're right about no big caps on two of the relays. I was 
looking at the current version schematic, but there's an older one 
posted on W8JI's site with a completely different arrangement which must 
be what you had. That older circuit design is less than clever (IMHO).


When a relay is deenergized, the steering diodes & part of the bridge 
are all forward biased forming a clamp of sorts. Not as effective as if 
a diode were directly across the coil with short leads.


I did not mean to imply operator error as the cause of failure. I was 
guessing hot switching the antenna related to some intermittent hardware 
problem.


Glad you found the source of the problem. Sounds like you put that old 
RCS-4 right where it belongs!


73,
Josh W6XU

On 5/21/2016 9:05 PM, Dauer, Edward wrote:

Josh —

Thanks for looking further into it.  I looked pretty carefully before the
RCS-4 went into the trash - no electrolytics in the relay box that I could
see.  Maybe a manufacturing defect rather than a design defect?  But it’s
in a landfill somewhere now so I can’t confirm that.  In my profession a
skeptic might call that spoliation of the evidence.  But the traces on the
‘scope as I switched through the selector with no transmitter attached
were unmistakable - very large very fast transient spikes.  Not a good
thing, whatever the cause.

I wonder if the diodes that are in the RCS-4 system are actually being
used as flyback or suppressor diodes.  The RCS-4 power supply is low
voltage AC, not DC.  The diodes in the control box separate the positive
half cycle from the negative half cycle; as I read it the diodes that are
in the relay box select for each relay the half cycle they like, telling
the relays to do what the control switch says it asked them to do given
that there is but one relay voltage conductor - the center lead of the RF
coax.  Would they work double-duty as flybacks in that configuration?
Pardon the anthropomorphisms - I have already confessed my intellectual
limitations in the field.

Hot switching is a theoretical possibility but if that means an
operator-induced lack of synchrony between keying the TX and switching the
antennas, I choose to believe it unlikely.  And failures three times and
every time and only when on that antenna system but not on any other?
Improbable, I would think.

In any case, the system that used the RF coax for the antenna relay
voltages is no longer here.  When it was here, I had repeated and rather
expensive PA blowups.  As soon as it left everything worked just right.
Reverting to my other profession’s argot, that’s a correlation that
implies causation.  Lots of human behavior has been built on less.

Anyway, life is good again.  My K2 is happy.  The people who sold me the
new remote switch probably are too.

Ted, KN1CBR



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