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>From k3lr Thu Jan 28 11:27:01 1999
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Date: Thu, 28 Jan 1999 11:25:35 -0400
From: Jim Idelson <jimi@designet.com>
Subject: re[2]: [RFI] re: Mystery Noise
To: "Mike A. King" <scsueepe@mtcnet.net>
cc: RFI Reflector <rfi@contesting.com>
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Mike,
Basically, the idea is to listen for the noise using AM detection and a
directional antenna. The noise is likely to be stronger at lower
frequencies,
so you start listening there. As you get closer to the source, the
signal
gets so strong that you can't DF it any more. So, you listen at a
higher
frequency where the signal strength is lower. People seem to agree that
a
small yagi or DF loop connected to a portable shortwave/VHF receiver is
a good combination. Some suggest an aircraft band receiver. Others say
you can use a 2m HT or a small portable TV for the VHF receiver.
I think all this stuff is described pretty well in the RFI Handbook
from the
ARRL. Good luck. Be subtle. Don't forget to bring your sledge hammer
and explosives.
Jim
>
Hi Jim,
Just been reading the mail on this one...hehe, I loved your responces.
(#3
and #4)
Anyway, I have a similar situation where I have no idea where the S9
noise
is coming from, intermittant in nature. The noise seems to have very
quick
spikes that last a millisecond at a time for a few minuts before it
turns on
full blast for minuts at a time, then it is gone. I really believe
that it
is not coming from within my QTH. Also, all our power lines, CATV and
Telephone lines are underground in town here, so I am ruling out that
one
except lighting poles and the HID metal halid or high pressure sodium
lamps.
It never used to effect me on 10M, so I really did not worry about it
because that is where I mainly operated. It did seem to effect 15, 20,
40,
etc, but the noise blankers on my FT1000MP did a fairly good job.
Well, now with the noise on 10M, I am really concerned. The MP is not
a
real mobile rig, so driving that thing around town to hunt the noise
was not
a good solution. I have purchased a FT847 for the UHF and VHF
capability, I
guess I will use that rig for tracking around town, hope that helps me
out.
Hate to think I got that thing just for tracking noise.....
In lieu of that, I was wondering what kind of good advice you received
on
direction finding, antennas etc. I am going to have to go that route
apparently. If you have the time, I would appreciate it if could give
me
the skinny....
Take care and good luck to you sir.
Mike - KM0T
-----Original Message-----
From: Jim Idelson <jimi@designet.com>
To: RFI Reflector <rfi@contesting.com>
To: <rfi@contesting.com>
Date: Thursday, January 28, 1999 9:46 AM
Subject: [RFI] re: Mystery Noise
>
>Hi everybody,
>
>Thanks to all who responded to my call for assistance. I received so
>many messages, I need to respond to you as a group - not individually.
>
>1. To those of you who gave me ideas on how to track the noise more
>accurately with a receiver and DF antenna, I'm collecting the stuff
and
>waiting patiently for the noise to return so I can run out in the cold
and
make
>tracks in the snow. See Note 1 below.
>
>2. And those of you who suggested the kinds of appliances that
>might be emanating the noise were very creative. I'll be on the
lookout
for
>an aquarium equipped with a pump, thermostat, flourescent lighting on
a
dimmer and, of course, a doorbell. Waiting patiently for the noise to
return.
>See Note 1 below.
>
>3. Many of you focused on ways to handle the sensitive situation
>with these neighbors. Getting the power company involved in the
discussion
>[and focusing on the idea that we are eliminating the strong
possibility
that
>the noisy device might actually cause the neighbors' house to burn to
the
>ground] is a stroke of brilliance.
> And some of you suggested that I might mount a counteroffensive
>strategy using penetrating RF fields or just the right amount of
explosive
>material. I sure wish you guys had been at my public hearings a couple
of
>months ago. I would definitely have asked you to handle the most
sensitive
>discussions.
>
>4. One message came through a bit garbled. Am I supposed to hit
>the utility pole or the neighbor with the sledge hammer?
>
>Note 1: I fully expect the noise to return only in the midst of a 200
to
230
>QSO/hour run in the upcoming ARRL DX Contest.
>
>73,
>
>Jim K1IR
>
>-------------------------------------------------------
>The Information Resource for Conferencing Professionals
>-------------------------------------------------------
>James S. Idelson
>President
>DesigNET International, Inc.
>96 Morse Road
>Sudbury, Massachusetts USA 01776
>
>tel 978.443.5549
>fax 978.443.2034
>pager 800.362.0156
>email jimi@designet.com
>web http://www.designet.com
>
>--
>Submissions: rfi@contesting.com
>Administrative requests: rfi-REQUEST@contesting.com
>WWW: http://www.contesting.com/rfi-faq.html
>Questions: owner-rfi@contesting.com
>
<
Jim
-------------------------------------------------------
The Information Resource for Conferencing Professionals
-------------------------------------------------------
James S. Idelson
President
DesigNET International, Inc.
96 Morse Road
Sudbury, Massachusetts USA 01776
tel 978.443.5549
fax 978.443.2034
pager 800.362.0156
email jimi@designet.com
web http://www.designet.com
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