John, KK9A is absolutely correct: without external bandpass filters, the replacement of PIN diodes in the T/R switches, even with more robust replacement devices, may not prevent the burnout from re-occurring.
The K3/K3s lowpass filter for 15/17 meters would offer virtually no attenuation of a high level 20 meter signal before it hits the T/R switch diodes. If external bandpass filters were in use, you will want to measure the low side attenuation of your 15 meter bandpass filter - it may not be sufficient to prevent a high power 20 meter signal from impinging on those T/R switch diodes. Mike, K8CN ______________________________________________________________ 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]
