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@ka1j.com>
To: rfi@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
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