[Elecraft] Excessive SWR Faulting KPA500

[donovanf at starpower.net]

Hi Ed, 


What results do you observe when you connect the output of your 
KPA500 direct to a dummy load? 


73 
Frank 
W3LPL 

----- Original Message -----

From: k2te at juno.com 
To: elecraft at mailman.qth.net 
Sent: Saturday, April 18, 2020 12:18:55 AM 
Subject: [Elecraft] Excessive SWR Faulting KPA500 

I discovered a problem this afternoon where the KPA500 is faulting on 20, 
17 and 12 meters. Set up here is the K-line, K3/KAT500/KPA500. 
Everything had been working fine until this point. I get a hard fault 
(error code 9) on the three bands which means excessive SWR even though 
it has tuned fine before switching from standby. Antennas: 6BTV vertical 
and Inverted Vs for 17 and 12. The Vs are fed from a common point. The 
KPA500 works fine on 80 thru 10 on the 6BTV except 20 of course. I tried 
turning down the power when on 20 (via the K3 drive) but the SWR runs up 
and faults. 

I checked the Elecraft website but no schematics for the KPA500. My 
guess is the LPF units for the bands in question have gone TU. 

73 de Ed 

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