Dual pilot phase lock loop for radio frequency transmission

Details Dual pilot phase lock loop for radio frequency transmission Dual pilot phase lock loop for radio frequency transmission

1984-04-24

1986-10-21

Bookbinder, Marc E.

Telecommunications

Transmitter and receiver at separate stations

Suppressed carrier wave system

455 71, 455109, 455119, 455202, 455260, 455265, 370 74, H04B 104, H04B 130

Patent

active

046189963

ABSTRACT:
A radio frequency transmission system contains at least one coherently modulated information signal, for example, a T.V. signal. At a transmission, the information signal is combined with two pilot tones, F1 and F2, related by the equation F1=N/M F2, where N and M are integers. The combined signal is suppressed-carrier modulated at microwave frequencies and transmitted to a receiver. At the receiver, the signals are demodulated by a local oscillator. The two pilot tones are then separated from the information signal and are compared to each other. The local oscillator frequency is controlled in response to this comparison such that the pilot tones at the receiver bear the same relationship to each other that they had at the transmitter. When this is achieved, the local oscillator frequency is the same as the suppressed-carrier frequency and co-channel interference is prevented.

REFERENCES:
patent: 3571717 (1971-03-01), Monrolin
patent: 4165486 (1979-08-01), Yoshisato
patent: 4209748 (1980-06-01), Weber

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