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Re: [IRCA] LW-MW Interference
Rene,
I have exactly the same problem. My neighbors installed one several
years ago and it totally wrecked my LW and lower MW reception. At
first I was baffled because it wasn't coming via radiation, but rather
was showing up at the electrical input to my house; I figured out
that the buried fence wires ran parallel to the main power feed to
their house, and the signal was coupled into the electrical
distribution for the entire neighborhood. It was re-radiating inside
their own house too, to the point where their dog wouldn't go near the
TV and stereo system because the signal was setting off its collar
inside the house!
Some options might be:
- ask if they could turn down the transmitted power of the unit, and
see if that reduces the interference you receive (pitch it as being
more humane to the dog :-)
- offer to replace the transmitter and collar units with ones that
don't use the LW/MW frequencies
- see if there is a way to locate the buried wires that wouldn't
radiate into your antenna's pickup pattern.
I think these things should be outlawed, as I suspect they don't
comply with Part 15 regulations, but good luck in trying to pursue
that path,
Brett
On Dec 16, 2008, at 2:30 PM, Rene Tetro wrote:
Hi all,
I’ve been going crazy the past few weeks trying to figure out where
a loud buzzing sound is coming from whenever I try to listen to
certain LW and MW frequencies. Well, this morning I went out with
my field strength meter and found the culprit. It turns out that
the offending device is one of those fenceless dog perimeter units
that my next door neighbor had installed a few weeks back. He
leaves it on 24/7 even when the dog is not outside “just in case he
gets out.”
In so far as I can tell the thing runs at around 110 khz, but has a
broad noisy spectrum that extends up to about 300 khz, and then
again appears in the AM band between 550-700 khz and 1000-1120 khz.
Short of cutting the guy’s buried radiating wire ☺, I’m at a
little bit of a loss in trying to get rid of this interference.
I've tried various filters to no avail. The only ones that work
well, of course, also attenuate the frequencies I'm interested in.
Have any of you come across this problem and found a way to resolve
it?
73,
Rene'
Rene' F. Tetro
Chief Engineer
Salem Communications - Philadelphia
WNTP-AM / WFIL-AM
117 Ridge Pike
Lafayette Hill, PA 19444
Voice: 610-828-6965 Ext. 41
Fax: 610-828-6725
Email: rtetro@xxxxxxxxx
"Excelsior, you fathead!" - Jean Shepherd
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