Nearly DC IF phase locked transceiver

Details Nearly DC IF phase locked transceiver Nearly DC IF phase locked transceiver

1988-12-12

1989-07-25

Safourek, Benedict V.

Pulse or digital communications

Repeaters

Testing

324 77C, 375 97, 455 76, 455 86, 455259, 455324, H04B 110

Patent

active

048521230

ABSTRACT:
A receiver which converts the RF carrier to a very low frequency and incorporates a PLL demodulator which allows the IF to be AC coupled. This PLL demodulator does not include the IF filters. The bandwidth of the PLL demodulator is wide enough to demodulate FM. Also, components of the receiver can be switched to a transmission mode capable of FM or PSK modulation with a simple circuit. Finally, the receiver includes an AM or PSK coherent amplitude detector which is modified into an imageless spectrum analyzer.

REFERENCES:
patent: 3825830 (1974-07-01), O'Connor
patent: 4153884 (1979-05-01), Ikeguchi et al.
patent: 4349919 (1982-09-01), Richardson
patent: 4451782 (1984-05-01), Ashida
patent: 4599743 (1986-07-01), Reed
patent: 4670870 (1987-06-01), Hewinson et al.

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