Demodulating system for auxiliary channel in straight-through ra

Details Demodulating system for auxiliary channel in straight-through ra Demodulating system for auxiliary channel in straight-through ra

1978-05-25

1980-04-15

Martin, John C.

Telecommunications

Carrier wave repeater or relay system

Two separate way transmission

179170HF, 455 17, 455 21, H04B 714

Patent

active

041986008

ABSTRACT:
The present invention discloses an FM microwave radio frequency repeater using the straight-through system for relaying signals of a plurality of channels having different carrier frequencies, each of the channels including an auxiliary channel. The system according to the invention is characterized in that the auxiliary channel has the signals thereof demodulated through frequency discrimination of a difference frequency signal obtained by mixing together two received microwaves.

REFERENCES:
patent: 3633103 (1972-01-01), Sugiyama
patent: 3866121 (1975-02-01), Nakamura
patent: 4039947 (1977-08-01), Miedema
patent: 4041389 (1977-08-01), Oades
patent: 4110710 (1978-08-01), Watson
"2 GHz Repeater Built Without I-F", Microwaves, vol. 15, No. 6, p. 16, Jun. 1976.
A 20 GHz Radio Repeater for 400 Mb/s Digital Transmission, Ogata et al., IEEE Conf. on Comm. Vol II, Jun. 11-13, 1973, pp. 28-25 to 28-30.

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