[Lowfer] Was Invisible dog fence LF and MF interference -Innotek

[Laurence KL1 X]

From: hellozerohellozero at hotmail.com
Subject: RE: [Lowfer] Invisible dog fence LF and MF interference is 0.5oz of C4 the answer?
Date: Wed, 3 Apr 2013 16:08:56 -0800




Lee - thanks - the unit that is causing this racket is an Innotek "Dog Smart" unit about 7 years old - AC walwart with AA battery back up 
 



http://kl7uk.com/smartdog.jpghttp://kl7uk.com/underloop.jpg


Im conversing with the vendor but it appears  this multivibrator with a tooned output tranny is a little wider than it should be - quite where its supposed to be centered frequency wise has me baffled - Im awaiting a field fox analyser but on a portable radio its from 100K to 10MHz when within 10ft :-(
 
The loop shown in the underloop jpg has a resistance of about 12ohm and >20Mohms to Earth so thats fine - running parallel to the underground utilities isnt so good  - 
 
Now I know what Im looking for Ive identified another similar signature from another house just 200m away - another wideband unit These dang fenceless dog devices maybe part 15 but talk about a racket...
 
 
Laurence KL 1 X
 

 
> Date: Wed, 3 Apr 2013 01:55:00 -0700
> From: fccpart15 at earthlink.net
> To: lowfer at mailman.qth.net
> Subject: Re: [Lowfer] Invisible dog fence LF and MF interference is 0.5oz of C4 the answer?
> 
> Fascinating! Please keep us posted on all the details and resolutions. I am about to set up a receive system in a major urban, RF noisy location, and would like some tips. I have smart meters, water and power
> nearby. Noisy video cable systems, unshielded twisted pair and coax. And all manner of switching power supplies from battery chargers to computers and video monitors. Any clues would be very helpful. Thanks!
> Lee
> 
> 
> -----Original Message-----
> >From: "Howell, Laurence J" <L.Howell at conocophillips.com>
> >Sent: Apr 1, 2013 9:35 AM
> >To: "'Discussion of the Loafer (US, European, &amp;	UK) and MedFer bands'" <lowfer at mailman.qth.net>
> >Subject: [Loafer] Invisible dog fence LF and MF interference is 0.5oz of C4 the answer?
> >
> >Im suffering from a large scale sideband interference from app 110kHz -5Mhz at various levels - the noise sounds like a constant noisy Texan cricket on steroids. Its been with me since Ive moved in but I finally got fed up and located the source as it put all sorts of lines across the screen. The pulses are nearly at 9khz multiples. OK if you want to listen something in between but Im hit hard at 474kHz, hence or fence why Im going on the offensive
> >
> >http://kl7uk.com/dogfence2.jpg