"No hum using a dummy load. No hum using a dipole. Hum only with my all band vertical."
I don't understand how that information results in "problem solved". The problem didn't go away. It could perhaps be RFI but isn't it more likely that the hum is dependent on the load presented by the antenna system? Does the hum come the PSU or the RF unit? KPA500 hum level is directly related to PA current which is, in turn, related to output power and PA efficiency. PA efficiently is strongly dependent on antenna system load therefor hum level is dependent on antenna system load. A bored and cynical observer might perhaps say that KPA500 hum is "normal" so why wouldn't the KPA1500 be expected to hum. Perhaps you should be investigating the conditions for which it does not hum? 73, Andy, k3wyc ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
