[RFI] Signals on 160

[JW]

What antenna type? Any balun at the feedpoint etc?
Some antenna designs and methods for matching, feeding are_less_ prone to common mode currents developed inside the house than others on receive.
I presently use a vertical tuned loop in the backyard on 160 meters. This antenna with a balanced feed picks up less 'noise'than other 'compromise' antennas I have tried on that bandat this location. 
Even a K9AY loop (half sized) placed in the front yard awayfrom utilities required an extra 1:1 transformer in-line with the coax to knock down the house-made noise such that external signals could be picked up. The 9:1 xfmr used at the feedpoint was insufficient to keep 'noise' out of that antenna.
Jim WB5WPA

      From: Gary Smith <Gary at ka1j.com>
 To: rfi at contesting.com 
 Sent: Sunday, October 28, 2018 12:32 PM
 Subject: [RFI] Signals on 160
   
I've been encountering some strong signals 
on 160 recently. I made some approximate 
guesses at the frequency using the P3 
markers to measure them. Here's the 
signals at 1:20PM local time with a center 
frequency of 1.848.67

The main signals are about 42 KHz apart.
The lesser spikes in-between appear at 
somewhat regular intervals. 

http://doctorgary.net/spikes-on-p3.jpg

Here's the measured values of the main 
signals

http://doctorgary.net/frequencies.jpg


Any idea what might be the source of 
signals spaced like this?

73,

Gary
KA1J
_______________________________________________
RFI mailing list
RFI at contesting.com
http://lists.contesting.com/mailman/listinfo/rfi