TELEVISION AFC SYSTEM USEABLE WITH OFFSET CARRIER FREQUENCIES

摘要

An AFC circuit for a television receiver capable of unambiguous operation with substantially offset signal frequencies has a response characteristic defined by a positive portion intermediate a pair of substantially equally sized negative portions. The circuit includes a multiplier with an unbalanced coupling between the limiter and the discriminator which has.a single adjustable tuned circuit nominally tuned to 45.75 MHz.