Double quadrature fm receiver

Details Double quadrature fm receiver Double quadrature fm receiver

H - Electricity

03

D

325/73

H03D 3/00 (2006.01) H03D 7/16 (2006.01)

Patent

CA 1050119

DOUBLE QUADRATURE FM RECEIVER BY RAY (NMI) BOOTH "Abstract of the Disclosure" An FM receiver employing dual signal demodulation channels, each receiving an incoming frequency modulated carrier. A first channel con- ventionally recovers the intelligence signal modulated on the incoming carrier. The second channel has a frequency conversion circuit including a mixer and an intection oscillator, the latter being frequency modulated by feedback of the intelligence signal recoverd in the first channel. The injection oscillator deviation is caused to be 180° out of phase with the deviation imparted to the incoming carrier, and the resulting second channel intermediate frequency signal is demodulated to provide the receiver intelligence output signal.

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