[IRCA] LW-MW Interference

["Rene Tetro" <rtetro@xxxxxxxxx>]

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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