You might be referring to this from an Elecraft repair invoice: "Replaced Q5, D7, R3, R9 and R24 for Transmit/Receive MOD (Improves robustness in Transmit/Receive circuitry)."
My KPA500 was back to the factory in March and had this mod installed. That didn't help much in the "robust" department, because my amp went south almost immediately after its return. Apparently the PIN diodes D8, D9 and/or R7 have failed. I received many replies to my question on this forum from others who had the exact same issue. The symptom is recieve signal is attenuated about 20 dB when Operate is engaged; normal in Standby. Jim - WS6X On Mon, Jun 21, 2021, 8:09 PM HP via Elecraft <[email protected]> wrote: > I saw in archives that there is a KPA500 TR switch mod kit - I cant find > it on > the Elecraft parts web site .My KPA is circa 7/2014 . > > Does this exist and what does it consist of ?? > > > Hank K7HP > ______________________________________________________________ > 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]
