My radio shows about S4 noise on15m when the beam is oriented towards the
nearest power pole. There is S3 noise on 10m and almost none on 20m and
below. The noise is canceled completely with NB so I assume it must be from
a single source.
My MFJ VHF sniffer detects just a trace or nothing. A DX engineering loop
has weak readings, similar in strength to the nearest pole and to the next
few poles.
The QTH is in a rural area. I walked along power lines for a mile and
could not find anything strong. There are some poles deep on private
properties.
My first question is whether the power lines are somewhat resonant on 15m
and carry the signal for a long distance. My second question is about a
strategy to find the RFI when teh culprit is far away and directions from
loops change every 50 ft.
Aside from the MFJ 3 el sniffer, I have their ultrasonic dish, a tuned loop
for HF and a DX engineering directional loop. Also a Yagi for 70cm.
Ignacy NO9E
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