If you notice a drop in signal strength when simply switching the amplifier from "Standby" to "Operate", it means that the T/R diodes are biased for transmit (not receive). Check R7 the 51 ohm SMD resistor on the daughter board as the most likely failure. It has happened to me and several others on the reflector.
Dr. William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ Moderator North American QRO Group at Groups.IO. email: [email protected] -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Don Wilhelm Sent: Monday, February 10, 2020 6:00 PM To: Bill Weaver <[email protected]>; [email protected] Cc: [email protected] Subject: Re: [Elecraft] KPA-500 Switch from STBY to OPER Bill, No relays in the T/R switching path for the KPA500 - all solid state switching. 73, Don W3FPR On 2/10/2020 6:39 PM, Bill Weaver wrote: > If there is a relay in the rx signal path, check the contacts. I had that happen with my Alpha recently. Of all the possibilities that was the easiest thing to fix. Thankfully that was the problem :-). ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [email protected] ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [email protected]
