Riddle me this! I have strong interferance since installing an air source heat pump. It is most annoying on 20M. It is also present on 40M and 15M. My 40M antenna is twice as far from the compressor and the noise on that band is reduced. On 20M is is S3-4. It used to be S1. Here is what I have done in trying to eliminate this problem:
1. I removed the 220VAC from the compressor at the breaker panel. The noise is gone. 2. I turned the breaker back on and put my indoor units on fan only. The noise is gone. I guess this proves the noise is coming from the compressor. Also when I turn my beam toward the compressor the noise increases. 3. I disconnected my power supply and connected the K3 to a battery. The noise is gone so It is not coming in on the house AC circuit. 4. I disonnected the antenna at the K3. The noise is gone so it seems it was coming from the antenna. 5. I reconnect the antenna and turn the RF gain to zero. The noise is gone from the speaker but on the waterfall it is NOT gone. I am hearing a buzz in the speaker or headphones and can see many vertical lines on the P3 waterfall. The wider my bandwidth setting the more noticable problem but the lines are there for the entire width of the P3 scan. Maybe 40 lines on P3 display with a 5 khz scan width. I have tried placing 3 capacitors across the 220VAC terminals where it connects to the compressor. L>G, L>N, N>G with no measureable results. I would be very happy if someone can shed a little light on this. 73, -Robby VY2SS So the noise is present in the IF -- View this message in context: http://elecraft.365791.n2.nabble.com/Noise-from-compressor-tp7513403.html Sent from the Elecraft mailing list archive at Nabble.com. ______________________________________________________________ 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
