I'm trying to repair a break (probably 2 of them) in an Inivisible Fence (that actual brand). Everywhere I look, it says to put a 100uH inductor in parallel with the fence leads at the transmitter. Then use a portable AM radio to follow the fence line.

The thing is, the transmitter, an ICT801 unit (https://www.manualslib.com/manual/1315539/Invisible-Fence-Ict-801.html) operates at either 7 or 10kHz. Which are of course orders of magnitude different in frequency from the AM radio band.

So, is the AM radio going to detect harmonics of the 7 or 10kHz signal, or is this advice targeted at other similar systems that use different frequencies ?

  • why don't you try it?
    – jsotola
    Nov 25 '21 at 6:55
  • Inductor and $12 AM radio on order ! Just curious here ... Nov 25 '21 at 7:37
  • Another rec is to wind a piece of the fence wire around a lawn mower sparkplug - generator some RF white noise I guess. Nov 25 '21 at 7:38

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