FWIW, Although I don't have the KAT500, I have found my KPA500 to be very, very sensitive to rf on the feedline, especially on 80 and 40 meters. I have checked, rechecked everything (connectors, feedline, switches, etc.) and tried adding various common mode filters, changing feedline length, etc. over a period of 2 years now and still have not resolved the issue. I disassembled my KPA500 and checked all the chassis grounds, making sure all was tight and no paint was interfering with the rf integrity of the case. That did produce some improvement, but the problem persists. In my case, the random swr spike and (occasional) resulting fault always occur during the first microseconds of a transmission. Though Elecraft support has worked with me to try to resolve this issue, so far it has no yielded to our efforts. This does not occur when I transmit into a dummy load, either in the shack or at the tower. Though my experience isn't the same as is being discussed here, I suspect the root cause may be similar.
Bob K5SM ______________________________________________________________ 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
