Here's the set up: K3 to KPA500 to KAT500, all Aux bus connections. Began to have high attenuation on receive when the KPA500 was turned from STBY to OPER. Determined by Elecraft to be a blown PIN diode, which makes sense. But why did the PIN diode blow?
Could be that it just failed, could be I mistakenly QSYed and transmitted with KPA at high power before KAT was tuned for new band. But I also remember this scenario happening a few times before I noticed the RX attentuation: Running N1MM software in a CW contest. I was transmitting some N1MM message and while transmitting went to hit the ESC key to do something and instead hit the ` key, which in N1MM turns on the sub-RX in the K3. In the heat of a contest exchange, hard to remember exactly what happened but I think that did cause a hard fault with the KPA. Not long after that the PIN diode was blown. Craig, the guy who repaired my KPA, said he didn't see how an inbound SUBRX ON command to the K3 while transmitting cause lead to a condition where the K3 is transmitting into the KPA while the KPA is in RX mode, but I'd figured I'd cast a wider net to see if it triggers any possible thoughts. I'm also cross-posting to the N1MM reflector. John K3TN -- View this message in context: http://elecraft.365791.n2.nabble.com/K3-KPA500-PIN-Diode-Failure-in-KPA-When-K3-Subrx-Turned-on-During-Xmit-tp7570227.html Sent from the Elecraft mailing list archive at Nabble.com. ______________________________________________________________ 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
