Phaselocked receiver with orderwire channel

Details Phaselocked receiver with orderwire channel Phaselocked receiver with orderwire channel

1979-10-17

1981-05-26

Ng, Jin F.

Telecommunications

Receiver or analog modulated signal frequency converter

Frequency or phase modulation

375 81, 455260, 455265, 329124, H04B 116

Patent

active

042702216

ABSTRACT:
A radio receiver includes a phaselocked loop including a main phase detector which accomplishes both carrier extraction and demodulation of an FM orderwire signal. The loop bandwidth characteristic is made suitable for de-emphasis of the FM orderwire audio signal, and the output of a quadrature phase detector is applied as a divisor to an analog divider in the phaselocked loop to cause the bandwidth of the phaselocked loop to remain substantially constant despite changes in input signal level.

REFERENCES:
patent: 3745255 (1973-07-01), Fletcher et al.
patent: 3909735 (1975-09-01), Anderson et al.
patent: 4053834 (1977-10-01), Lerner

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