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

Wed Jun 15 11:45:37 EDT 2022

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

73
Bob, K4TAX 

Sent from my iPhone

> On Jun 15, 2022, at 10:25 AM, N4ST - Jim <N4ST at n4st.com> wrote:
> 
> For some reason, my previous post did not show up.
> 
> *** PROBLEM SOLVED ***
> 
> I had an old LPA/PA combo that was replaced with an upgraded LPA/PA combo.
> The new PA required a configuration setting that inserted 6dB of attenuation in the amplifier chain to avoid instabilities.
> The old combo would not reach full power if the attenuation was inserted, but the new combo was unstable unless it was.
> Keith at Elecraft and also K7HP both suggested the "fix" and that was indeed the problem!
> 
> ____________
> 73,
> Jim - N4ST
> 
> 
> -----Original Message-----
> From: elecraft-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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