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KG6BAJ > NWSGRP 26.08.09 07:22l 57 Lines 2322 Bytes #999 (0) @ WW
BID : 10237_N1OES
Read: GUEST
Subj: Line noise
Path: DB0FHN<DB0FOR<DB0MRW<DB0ERF<OK0NAG<IK6ZDE<I4UKI<UA6ADV<DB0ANF<CX2SA<
KD4GCA<KG6BAJ<KG6BAJ
Sent: 090825/2001Z @:KG6BAJ.#NCA.CA.USA.NOAM #:10237 [Grass Valley] InterGate
N1OES
** NEWSGROUP: rec.radio.amateur.antenna
** FROM : "Rick" <ricknj10@hotmail.com>
A few months ago we had a discussion going here about my line noise problem
here in NJ.
I am happy to report the problem got fixed today, and K2XT is one happy Dude
! I further want to
warn 80 meter and 160 meter DX ops that I am back on the lower bands this
winter, have QRO,
and so look out Baby, I'm going to be able to hear that DX!
In great summary what we found a couple months ago was, driving from my
house along the roads near here,
we could locate line noise by using my FT-100 transceiver on different
bands, in AM mode. Although the
noise causes me the most problems on 80/160 my attempts at DF'ing it on
those bands were useless. On ten and
six meters the noise can be heard 1/4 to 1/2 mile away from the source.
Switch to 2 meters and I could
get a lot closer where the noise originated, within +/- 100 yards or so.
Switch to 440 and I could tell within a few poles.
Then as I reported before I built up a 440 MHz Quagi which enabled me to
stand across the road from the
offending pole and definitely pinpoint it.
Here's where it gets interesting. The particular technician I was working
with from the power company has
had great success using a hand held acoustic tool. This thing even has a
gun sight on it to enable him to
pinpoint the offending insulator/lightning arrestor/bad crimp, etc. On this
pole however, he couldn't get a
good reading. Today a crew worked on it, and finally determined it was a
bad transformer feeding two houses.
I guess that explains why the acoustic tool was ineffective. I had the 10 m
receiver here set so that when the
noise level dropped 6 db the squelch would close and so I was able to know
instantly when they had fixed it.
This noise source was 1.2 miles from my house. Noise was S9+5 db on 80 m
with a Beverage antenna,
S8 on 10 meters with a 3 ele beam. Having the beam indicate the direction
to look was very important.
A very frustrating 12 months + 6 days from the time I first reported it. 80
meters right now sounds like there's
no antenna connected. This is wonderful.
Rick K2XT
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