.... by feeding RF power to the telephone line, bypassing the hook-switch with the spark suppression capcitor......... My result was, it's theoretically possible, but you must tap the telephone line quite near due to it's strong RF attenuation.
In my instance, is it possible that RF is transmitted down the telephone line and finds its way to the ringer where its modulated by room audio?
I suspected this early on but thought it would never get pass the capacitor.
It could be worse than FM or WFM. It can be COFDM with 256-QAM. When this happen, oh la la ...
If you really want to track down a bugged telephone, make an antenna by wrapping a wire around the phone. Connect one end to the inner of a screened cable (co-ax), the other end to the shield of the cable then plug the cable into the receiver antenna connector. Then wrap the entire telephone in metal foil and also join it to the cable shield, this will ensure any signal from inside the phone is captured on the antenna but everything outside is excluded. Set the receiver to scan the widest frequency range possible. If there is a signal it will be very strong and obvious against the background noise.
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