Scott,
I initially did the "feed it through the local repeater" trick to
a hand-held at the site where I had located a noise source.
This was back +15 years or so and boosted my confidence
in my low band/160 tracking methods and verified I found
the source that was affecting. I did this, because, I had trouble
coming to grips that a 'source' could be a mile plus away
and be my 'problem'. This source had a unique signature, so
it was easy to distinguish by ear.
Since then, using Marine (MW/HF) directional tracking gear
and doing either continuous tracking (via a bicycle) or many
stops and taking multiple bearings to confirm that the source
is still off in the same direction I'm heading - until passing it
in which case the bearing 'swings' around still pointing at
the source. Using the Marine DF receiver with Sense antenna
cardiod directional pattern works extremely well.
The bicycle technique works well out to about a mile, and if
the source is still off in the distance the car picks up from
there. I did just this last week, finding one noise source to
my NNE at +1/2 mile at a residence and a second WNW
which turned out to be 5.4 miles distant.
By all means, use every trick in the book, it confirms a source
plus bolsters one's confidence as one become more experienced.
73 de AA5CT
.
.
On Monday, January 27, 2020, 10:05:12 AM CST, K9MA <k9ma@sdellington.us>
wrote:
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
>> Check out the Reverse Beacon Network
>> at <http://reversebeacon.net>, now
>> spotting RTTY activity worldwide.
>> For spots, please use your favorite
>> "retail" DX cluster.
>>
>> _______________________________________________
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>> http://lists.contesting.com/mailman/listinfo/rfi
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--
Scott K9MA
k9ma@sdellington.us
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