While tuning around the 14.100 region with my K2 connected to the transverter but with the transverter switched off (therefore effectively into a dummy load) I noticed a strange noise around 14.130. It's a sort of hash, rather like atmospheric noise, about 10KHz wide but peaking in strength at that frequency. Whilst listening, it suddenly stopped and changed to a squealing noise, like RF oscillation.
I've heard similar noises from switched mode power supplies, but it's usually radiated so you need an antenna connected to hear them. I cut the power to everything here anyway, and it didn't seem to make a difference. With everything disconnected from the K2, running off its internal battery, I can't hear the noise, so I'm not convinced that this is being generated inside the K2. As I reconnect the power lead, computer cable, antennas etc, the noise starts to be heard, but the thing that brings it up the most is when I plug something into the key jack. Normal band noise (from the transverter, or the HF antenna when connected, drowns this noise, so it has probably been present for a long time. But I have no idea what it is or where it is coming from. Anyone had anything similar to this, and found the answer? 73, -- Julian, G4ILO. (RSGB, ARRL, G-QRP, K2 #392) G4ILO's Shack: http://www.qsl.net/g4ilo _______________________________________________ Elecraft mailing list Post to: [email protected] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
