Message: 5
Date: Sun, 15 Jan 2017 11:31:43 -0500
From: Paul Plants <w3plp@verizon.net>
To: w5prchuck@gmail.com
Cc: Jim Thomson <jim.thom@telus.net>, "towertalk@contesting.com"
<towertalk@contesting.com>
Subject: Re: [TowerTalk] noise profiles...
Message-ID: <E043185A-6C48-4CE2-9EE9-66277B04B340@verizon.net>
Content-Type: text/plain; charset=utf-8
Paul,
If you are driving around with an HF rig in your neighborhood, you will have
a hard time finding interference that way. What I usually assume is that
the noise source is generating signals in the UHF spectrum as well. I tend
to walk, not drive, around with a 450Mhz Yaesu HT that has AM mode -
connected to a 6 el hand held yagi - and headphones. As you walk past each
pole, transformer, and house, point the yagi at the items to see if any
noise rises up from the noise floor. Typically - interference is no more
than 1 mile from your house (air mile) - often closer - if its S7+. I have
yet to not find the offender using this method. Once a suspecting source
has been zero'd in on, use the "deep null" feature of a 6 el yagi and see
where the nulls are (better rays than the max gain of the yagi). Try and
identify the source from at least 3 different sides to be sure its actually
where you keep thinking it is - often its not quite where you thought it
was.
73
Ed N1UR
Paul
W3PLP
Sent from my iPad Air 2
> On Jan 15, 2017, at 11:18 AM, <w5prchuck@gmail.com> <w5prchuck@gmail.com>
wrote:
>
> ?I have a noise, what do you think it could be?? doesn?t give us much to
go on. Can you give us more information?
>
> Does the signal level vary with frequency? No
> Does the level vary with direction? No
> How are you looking for it? With what? Yeasu ssb radio
> Surely it must be somehow localized to some area. How big? So far 2 mile
radius and still looking
> Have you checked close to power lines? Is it louder there? No
> Have you checked close to cable tv lines? No
> Have you determined it is not in your shack? Not. Did pull mains three
times
>
Signal drops off sharp below 18 MHz and above 30 mhz
>
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