Remote-controlled receiver arrangement using a modulated carrier

Claim 1

A remote controlled radio frequency receiver for receiving and demodulating control data contained on a carrier signal having a frequency of F 1 comprising: a local oscillator tunable over a frequency spectrum which contains the frequency F 1 for producing a signal F 2 modulated on said carrier F 1 ; a demodulator circuit for demodulating remote control commands from said signal F 2 ; a microprocessor for supplying remote control commands to remotely controlled equipment from digital data supplied by said demodulator; means for tuning and locking the frequency of the local oscillator with respect to the carrier frequency F 1 comprising a frequency synthesizer having a frequency incrementing means coupled to said microprocessor for tuning the receiver through a frequency band containing carrier frequency F 1 in response to tuning commands provided by said microprocessor; a portable box control coupled to said microprocessor for manually incrementing said tuning frequency of said oscillator to a preset frequency; and a non-volatile memory for preserving initial values of control values, and for storing more recent control commands which have been received, and for storing the carrier frequency F 1 of said carrier identifying a tuning frequency for said oscillator which produces said signal F 2 ; whereby when said carrier signal level decreases below a level which permits said locking of the local oscillator frequency, said local oscillator is tuned to a correct tuning frequency, and said most recent commands are available to control remote equipment operation when said carrier signal is unavailable, and said initial values are available for controlling said remotely controlled equipment in the event of a failure of said receiver.