KPA has FAILED...high SWR reported by K3 when amp in "Operate"
My KPA500 causes a high SWR showing at the K3 when the amp is in transmit operate. All else seems to work ok...reloaded firmware...checked faults...something about "power lost without controlled shutdown".
Re: KPA has FAILED...high SWR reported by K3 when amp in "Operate"
The amp has worked well with 500 watts out, and in standby works fine with 100 watts and the power shown on the led meter is correct. When in operate, it shows high swr with only 1 or 2 watts of drive. So something in the t/r switch has failed.
Thanks for the reply.
> Chuck - I'm a brand new KPA500 owner ...so don't have a lot of history. Probably not this simple, but I would suggest looking closely at the clearance between the center pin of the high power output connector and that metal shield. I thought the design was exceptional but was disappointed at how there was almost no clearance here. (If I had a Greenlee punch, I would have taken a nibble out to provide more clearance!) It's possible when you kick into high power, it could arc/short or have a bad VSWR. Also, have all the cables on the output side been run 500W+ before?? 73- Mark WA3OFR
> Sent via BlackBerry by AT&T
> -----Original Message-----
> From: ke9uw <[hidden email]>
> Date: Wed, 14 Mar 2012 06:37:06
> To: <[hidden email]>
> Subject: [Elecraft] KPA has FAILED...high SWR reported by K3 when amp in
> My KPA500 causes a high SWR showing at the K3 when the amp is in transmit
> operate. All else seems to work ok...reloaded firmware...checked
> faults...something about "power lost without controlled shutdown".
> Any ideas? Pin diode?
> Chuck, KE9UW
> View this message in context: http://elecraft.365791.n2.nabble.com/KPA-has-FAILED-high-SWR-reported-by-K3-when-amp-in-Operate-tp7371793p7371793.html > Sent from the Elecraft mailing list archive at Nabble.com.
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