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 ?