[Elecraft] PA DISS fault and relationship to SWR

[Michael Blake]

Yes, I did understand that Andy.  My GUESS was that the PA-DSS (efficiency) is sensitive to the actual load impedance.  I suspect that the SWR fault, that I sometimes see, is also sensitive to low vs high impedance.

73 - Mike - K9JRI



On May 28, 2018, at 09:24 AM, ANDY DURBIN <a.durbin at msn.com> wrote:

Thanks for the reply.  Please note that I have no issue with high SWR faults.  I have seen several FAULT 09 REFL HI events and they were all caused by an operator antenna switching error.  PA DISS (FAULT 11) is not an SWR fault although it appears it can be induced by a load mismatch.
73,
Andy k3wyc


From: Michael Blake <k9jri at mac.com>
Sent: Monday, May 28, 2018 6:10 AM
To: ANDY DURBIN
Cc: elecraft at mailman.qth.net
Subject: Re: [Elecraft] PA DISS fault and relationship to SWR
 
Andy, I have seen this too.  My remote tuner will sometimes quit with SWR in the 1.4 : 1 range.  Sometimes it causes a KPA500 SWR Fault and sometimes not.  My GUESS is that it depends on whether the impedance is <50 ohms or >50 ohms.  The SWR does not tell you which.

Michael Blake
k9jri at mac.com