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Years ago in the days of AM radios I built a radio using a bog role a few turns of wire on it a germanium diode and crystal ear piece. Fine tuning done with a bit of steel inside the bog role.
Try google crystal set radio and you will find the design.
Clearly the reverse can also be done one can transmit as well as receive.
The move to digital has reduced transmit power required by broadcaster and also increased power needed to receive. With such low powered transmitters it is not surprising that other items can knock them out.
I personally can't see the point in DAB radio. There is a good transmission on UHF with freeview, another on satellite plus the orignal FM signal on VHF so why add another duplicated signal half way between FM radio and Freeview TV it's just a waist of spectrum.
Try google crystal set radio and you will find the design.
Clearly the reverse can also be done one can transmit as well as receive.
The move to digital has reduced transmit power required by broadcaster and also increased power needed to receive. With such low powered transmitters it is not surprising that other items can knock them out.
I personally can't see the point in DAB radio. There is a good transmission on UHF with freeview, another on satellite plus the orignal FM signal on VHF so why add another duplicated signal half way between FM radio and Freeview TV it's just a waist of spectrum.