[AMRadio] Carrier Current Transmission

[Mike Duke, K5XU]

Many, if not most, of the college radio stations before FM took hold, used 
carrier current to transmit their AM signal. You always had dead spots, even 
close to the transmitter.

As late as the early 1990s, a company from Pennsylvania, LPB, was still 
manufacturing at least 2 carrier current transmitters. LPB stood for Low 
Power Broadcasting. I saw them in the exhibit hall of a conference of an FM 
sub-carrier broadcast group at least twice.

LPB also made at least one broadcast control board.



Mike Duke, K5XU
American Council of Blind Radio Amateurs