[Elecraft] [SPAM] K3S - High SWR on 6 Meters

Wed Jun 15 11:25:04 EDT 2022

For some reason, my previous post did not show up.

*** PROBLEM SOLVED ***

I had an old LPA/PA combo that was replaced with an upgraded LPA/PA combo.
The new PA required a configuration setting that inserted 6dB of attenuation in the amplifier chain to avoid instabilities.
The old combo would not reach full power if the attenuation was inserted, but the new combo was unstable unless it was.
Keith at Elecraft and also K7HP both suggested the "fix" and that was indeed the problem!

____________
73,
Jim - N4ST

-----Original Message-----
From: elecraft-bounces at mailman.qth.net <elecraft-bounces at mailman.qth.net> On Behalf Of Bob McGraw
Sent: Tuesday, June 14, 2022 20:56
To: elecraft at mailman.qth.net
Subject: [SPAM] [Elecraft] K3S - High SWR on 6 Meters

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

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

73

Bob, K4TAX

On 6/14/2022 7:46 PM, elecraft-request at mailman.qth.net wrote:
> Message: 6
> Date: Tue, 14 Jun 2022 09:37:33 -0600
> From: "N4ST - Jim"<N4ST at n4st.com>
> To:<john at kk9a.com>,	<elecraft at mailman.qth.net>
> Subject: Re: [Elecraft] K3S - High SWR on 6 Meters
> Message-ID:<[email protected]>
> Content-Type: text/plain;	charset="us-ascii"
>
> High SWR occurs immediately when using the FT8 Tune function on WSJT-X
> It does not occur initially with a dummy load, however once the high SWR
> state occurs, it persists when switching to a dummy load.
> A CW dit will clear the high SWR state..
>
> ___________
> 73,
> Jim - N4ST

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

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