Method and apparatus for indicating radio frequency carrier loss

Details Method and apparatus for indicating radio frequency carrier loss Method and apparatus for indicating radio frequency carrier loss

1984-04-25

1987-04-28

Ng:, Jin

Telecommunications

Receiver or analog modulated signal frequency converter

Frequency or phase modulation

455226, 455229, H04B 116, H04B 1700

Patent

active

046619968

ABSTRACT:
Method and apparatus for determining loss of a received frequency modulated carrier wherein the receiver includes a limiter and discriminator and generates an AGC voltage for controlling the gain of the receiver and producing an output signal from the discriminator having an output bandwidth in excess of that required for the information channel. The unused portion of the output bandwidth is used to sample the noise level voltage through a narrow band filter which upon reaching a selected magnitude provides an indication of the loss of the carrier. The invention, in another aspect, includes a gate control of the AGC voltage which for high signal values interrupts the action of the video networks deriving the noise level voltage.

REFERENCES:
patent: 3188571 (1965-06-01), Michael
patent: 3568068 (1971-03-01), Russell, Jr.
patent: 3851253 (1974-11-01), Eastmond
patent: 3979679 (1976-09-01), Bush et al.

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