[Lowfer] Invisible dog fence LF and MF interference is 0.5oz of C4 the answer?

[Lee]

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
>
>We went out with the very supportive local power utility and have located the source to a house about 0.5 miles from here and a lot of the interference is leaving his property via the power lines. SDR IQ L400B and portable baby bottle -
>
>Ive read the Q at A from QRZ and other web sites but wonder if anyone else has cleared this type of QRM.
>
>We have a site visit this afternoon and the owner is very cooperative and Ill finally "open the box" and get the model number
>
>The actual freq the mufti-vibrator is using is yet to be determined but I see 7.5, 12 and 17.5Khz, and 600Khz being mentioned for the wire loop variety from the various web/you tubes. I reckon I have a 600K variant but the perimeter loop may be corroded from joints and I have a diode and a 509ft plus loop antenna Im dealing with...that would appear to bone answer at the moment.
>
>This is what it sounds like on Medium wave on my K9AY on Omani
>
>http://kl7uk.com/dogfence.mov
>
>Just in case someone is hearing the same - oh, and by the way I can actually hear the rm on the overhead power lines 3 miles away :(
>
>Seems to be my interference month - also dealing with SMPSU issues at VLF from the coaxial system but at least we are moving in the right direction as the cable company are looking at replacing the unit with a less square wavy model =
>
>Laurence KL 1 X
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