The same hum here since I changed to the *RED TAP (211 to 230V).* I had _no hum with the YELLOW TAP (231 to 250 V)_. But then I had less than 60V with full power. The hum is coming out of the KPA500. What to do? Lothar, DJ8EW K3 1300 + KPA500 229
Am 01.08.2011 09:33, schrieb Klaus Koppendorfer: > Last week i assembled the kpa500 of oe6rdd > when we transmit we hear a realy loud hum (50hz) in the rythm of the cw > signals > > i have compared this with my own kpa-500 and there is no hum > i have tried to loosen the big srew which holds the tranformer with no result > > any ideas ?? > > 73 > Klaus > OE6KYG > KX1 244 > K2 1331 > K3 115 > ______________________________________________________________ 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
