In my case, it was not the PIN diodes themselves, but failure of R9. I'm away from my shack right now, so may not have the resistor ID correct. It is a 48 Ohm resistor. I fixed the problem by parallel connecting a pair of 1/4 W, 100 Ohm resistors across the open one. Problem solved. Been fine since. There is documentation of this problem. A German ham wrote to me with a link to the solution. If no one steps forward before tomorrow, I'll try to post the info in the morning. 73, Jim - WS6X
On Thu, Mar 31, 2022, 6:40 PM Andy Durbin <[email protected]> wrote: > "However, what I’m seeing is that when the amp is in OPER mode, my receive > signal strength drops way, way off to the point I have to go full AF volume > to hear signals. If I put the amp in STBY, signal levels go back to normal." > > These exact symptoms have been associated in past reports with a failure > of the TR switch PIN diodes. Jack's idea of incorrect band can be easily > confirmed, or eliminated, by looking at the KPA500 band display. > > Andy, k3wyc > ______________________________________________________________ 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]
