Re: 87.9 MHz FM Car Radio receives phone calls. Explanation?
Yes people had these phones that worked handset to base on around 49MHz and base to handset just above MW, about 1700kHz both NBFM and many an unmodified MW radio would tune in with no problem, and recover sufficient audio by slope detection.
You effectively tapped your own line and broadcasted it to your neighbours.
I even heard a BT spokesman interviewed on the radio claim he had no idea that these phones were so insecure, BT sold them in their showrooms (remember them).
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Graham.
G3ZVT
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