Re: Tandy/Realistic FM wireless intercoms
I've still got 2 pair of them and used them from house to shed until a few years ago.
They had to be used on the same phase and wouldn't work across different phases of a three phase system so it was possible to work the house next door, depending on which phase they were connected to.
Modern equipment, with filters, plugged in around the house does diminish their usefulness to the point of being unusable now.
And yes, they superimposed the audio onto a carrier that was superimposed on the mains.
There were circuits in some of the older mags like Practical Electronics from memory where you could build your own.
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