[Elecraft] K3S - High SWR on 6 Meters

[N4ST - Jim]

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


-----Original Message-----
From: elecraft-bounces at mailman.qth.net <elecraft-bounces at mailman.qth.net> On
Behalf Of john at kk9a.com
Sent: Monday, June 13, 2022 20:42
To: elecraft at mailman.qth.net
Subject: Re: [Elecraft] K3S - High SWR on 6 Meters

Does it do this if you transmit a long carrier into your antenna using the
tune button?  Can you transmit FT8 into a dummy load OK? 

John KK9A
   

N4ST wrote:

So, received a new KLPA3A & KPA3A from Elecraft in exchange for my old ones
plus $$.
Installed the new KLPA3A & KPA3A and passed LP and HP TX Calibration.
My 6M beam measures 1.06 SWR on analyzer.
CW Key down, 100W, I get 1.2 on external SWR meter and 1 bar on K3S SWR
meter.
With FT8 I'm OK for 1 or 2 transmits and then I get infinity on external SWR
meter and full scale on K3S SWR meter, but full power out.
If I switch to a dummy load, I get zero power out (fold back?)
If I operate FT8 at 8 watts with the beam, I get 1.2 on external SWR meter
and 1 bar on K3S SWR meter and 8 watts out.
Going back to CW full power seems to perform a reset.  Everything still fine
in CW, but now FT8 is OK for 1 or 2 transmits and then high SWR returns.

Any advice?
A spur/oscillation in the KPA3A?
A relay stuck/not switching?

My TenTec Eagle is carrying the load for me during these 6M openings.
(46 states worked in last few weeks)


___________ 
73,
Jim - N4ST

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