It's vitally important to make sure you are listening to the source of
the real problem. Otherwise, you can waste a lot of time tracking down
extraneous noise sources. I've found the best way to do this is to relay
the noise from my home receiver so I can listen to it while I'm
searching. I put the home receiver in AM mode, AGC off. There's always a
pattern of fluctuations; when they match, you're listening to the right
source. There is expensive equipment which records a noise "signature",
but I think you can do just as well, or better, just by listening this way.
73,
Scott K9MA
On 1/27/2020 08:30, Michael Martin wrote:
Hello Pete first I would suggest making sure that noise that you hear inside on
1.7 is active and make sure the noise on the street at 1.7 is active. If they
are both active then there's a good chance they're the same source. If the
noise isn't active on VHF VHF in that area that's because it's much further
away if in fact it is a power line noise, powerline meaning generated on the
power company equipment. A noise detectable on 160 m could be a mile or two
away and very strong. However not at all detectable at VHF.
Go through your process again in attenuate your noise level until you can drive
a block away from where you detected in hear no noise at all then you can go
back to that spot. There's a lot of noises that sound like soarking that aren't
sparking sources. at this point don't be so concerned about what it is but
concentrate on where it is. if the noise is too strong to attenuate change the
frequency. go up in frequency and find a null in the noise level and then
continue your search. if the noise is a sparking source the sound of the noise
won't change with a change of the frequency. when you change frequency to
attenuated if the sound changes in the noise then it is not a sparking source.
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On Jan 26, 2020, 9:56 PM, at 9:56 PM, N4ZR <n4zr@comcast.net> wrote:
Recently, I have experienced constant S8 line noise on 160 meters.
I've
killed the power in my house and run the radio on batteries, with no
change, so it's nothing inside. When I drive down the road a couple
hundred yards away, which has a 3-phase powerline on one side, with my
car radio tuned to 1710 KHz, the noise is almost deafening, with
definite peaks at certain poles, as well as intermittent snapping and
crackling noises that really suggest something loose or broken..
However, today I went out with my homebrew VHF aircraft band Moxon,
hoping to narrow down the noise-maker(s) to particular poles, and to my
surprise I could not hear anything comparable to what I heard at 1.7
MHz.
Any suggestions about how I might go about tracking down the source or
sources? The local power company guy is very willing, but does not
have
much training to go on.
--
73, Pete N4ZR
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--
Scott K9MA
k9ma@sdellington.us
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