My situation is different. In over 20 years of power pole rfi (gets
fixed, good for months, another crops up), all of my "harmful" ones have
been within 2-3 city blocks, usually less. An old 7.2kv 3 phase line
runs right by my yard and up the street where most of the issues arise.
The worst have been at the corners of my yard. Yea I know, dumb decision
to buy near a 3 phase line but I was young and stupid, lol. It also
limits tower height I can put up.
Last visit the power co lineman told me there maybe plans to re route
the 3 phase. Sounded like Christmas to me but I am not holding my breath.
Currently, I am hearing maybe 3 sources that are likely over 1/2 mile (I
say this because there are no 7.2kv lines within 1/2 mile in those
directions) but they are weak and very intermittent thus not worth
chasing for me. NB on lowest setting takes care of them. On HF they are
almost always unnoticeable without NB. On 6m I can hear them at times
with the yagi a bit better. Now that summer and high humidity has kicked
in, rarely hear them even on 6.
Looking at the OP's QTH, a bicycle would maybe be a good idea for him. I
have looked at the marine df unit. Would have bought one if I had not
found the poles easily, once I acquired a technique to identify the
correct noise :-)
73
Chuck
W4NBO
On 6/7/22 08:24, AA5CT wrote:
re: "I have been most successful (without spending high dollar on rfi
gear)
retransmitting the noise from my station receiver to a HT"
I did that early on - used a local UHF repeater to relay the audio from
the HF radio ... I've gotten good enough with the marine DF receiver
(which I didn't have back when) that it isn't necessary any more!
The KICKER is, when these 'sources' are found that are 1.74 miles
away, they WILL be quite strong just feet away ... that's a 2nd
good indicator! As you mention, a good number of poles produce
low-level noise that isn't heard a couple hundred feet away nor
at the home station QTH.
On poles I can get within 12 inches of the 'ground'/earth wire, I
make mental note of the signal strength/RF gain control setting
on the marine DF receiver I use for each pole near the strong
'noise' maker ... correlating this later with which pole makes
'noise' at UHF using a UHF Yagi and my success level on finding
these poles is 100%. Using a bicycle as transport really cuts
down the time walking between poles to do this too, b/c, part
of my learning/training process is to repeat this exercise
over several different days, just to satisfy MY curiosity and
desire to know I got the right pole.
de AA5CT Jim
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