[RFI] Powerline noise question

[Frank W3LPL]

Hi Rick,

I recently built a WB8DSB man portable flag antenna (March 2021 QST)
for RFI geolocation, its performance far exceeds my expectations.
Its narrow deep null quickly, easily and definitively located the
source of very troublesome 160 meter RFI to a single power pole
more than three miles from my QTH.  Prior to constructing the
flag antenna I could locate the RFI to only within a few hundred
yards of the RFI source.

I built my flag antenna entirely out of materials I had on hand
from previous projects including 3/8 inch diameter fiberglass rods,
a pair of Advanced Receiver Research P1-30/20VD 20 dB HF preamps,
a case of eight AA batteries to provide power to the preamps,
a switchable attenuator and a Tecsun PL330 portable HF receiver.

I highly recommend this easily constructed RFI geolocation antenna
for the toolkit of any serious HF operator.

73
Frank
W3LPL





----- Original Message -----
From: "Richard" <richard at karlquist.com>
To: "rfi" <rfi at contesting.com>
Sent: Friday, December 30, 2022 3:15:32 AM
Subject: [RFI] Powerline noise question

I have a powerline noise coming from about 2 miles away, which is
nevertheless quite strong at my QTH. 

Here are the symptoms: 

1.  A 120 Hz noise burst at regular intervals, about 0.9 seconds apart. 

2.  The noise goes away after a rain; then comes back after things dry
out. 

3.  Can be heard from 500 kHz up to a few MHz. 

4.  The noise is very strong along a road for a few miles.  There is a 

power line that follows the road.  I haven't been able to localize it
better than 

that so far.  From my QTH, though, it is definitely coming in at a
specific azimuth 

which is consistent with the noisy road a few miles away.  (Using a loop
antenna 

for DF'ing). 

Any help appreciated. 

-- 
Rick Karlquist
N6RK
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