Invisible Fence and nearly everyone else uses AM radio systems. The Dogwatch Brand uses FM radio systems and promotes this as being less prone to interference. Often our customers ask us if there is a difference.
In our opinion the short answer is no. Interference is rare. We have never seen a real life example of where an FM system performed better than an AM system.
Dogfence often uses the analogy that FM radio stations are clearer than AM and the example is disingenuous. Radio signals have to travel 10’s of miles to get from the transmission tower to your radio often through all kinds of obstacles. The dog fence signal only has to go a couple of feet from the boundary wire to the dog, through at most a couple of inches of soil. In this circumstance, being FM is of no practical value.
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