Radio transmitter-receiver system for increasing or decreasing c

Details Radio transmitter-receiver system for increasing or decreasing c Radio transmitter-receiver system for increasing or decreasing c

1987-11-25

1990-10-23

Olms, Douglas W.

Telecommunications

Transmitter and receiver at same station

With transmitter-receiver switching or interaction prevention

455 8, 455 78, 370 38, 370 691, 370 16, H04B 140, H04B 174

Patent

active

049658522

ABSTRACT:
The radio transmitter-receiver system for increasing or decreasing communication channels comprises radio transmitter-receivers each including a separated intermediate frequency portion for modulation and demodulation and a separated microwave portion, and having a multiplexer and a divider therebetween. Local oscillators in the intermediate frequency portion have a variable frequency function and the operating frequency of the intermediate frequency portion can be easily changed. The intermediate frequency portions are connected to the microwave portions through the multiplexer or the divider and the frequency of the microwave to be communicated is easily changed. Thus, an increase or decrease of the communication channels is possible at a low cost.

REFERENCES:
patent: 3089920 (1963-05-01), Law
patent: 3549811 (1970-12-01), Berreson
patent: 4039947 (1977-08-01), Miedema
patent: 4155039 (1979-05-01), Lechevin
patent: 4287598 (1981-09-01), Langseth et al.
patent: 4417348 (1983-11-01), Abbruscato
patent: 4541121 (1985-09-01), Blum
H. Panschar, "Versatile Modular System for Automatic Protection Switching on Radio Relay Links", Siemens Review, vol. 45, No. 10, Oct. 1978, Munich, DE.
European Search Report for EP-87-11-7896, The Hague, Mar. 5, 1989.
R. E. Fisher, "A Subscriber Set for the Equipment Test", The Bell System Technical Journal, vol. 58, No. 1, Jan. 1979, pp. 123, 128-131.
N. Ehrlich et al., "Cell-Site Hardware", The Bell System Technical Journal, vol. 58, No. 1, Jan. 1979, pp. 153, 176, 177, and page beginning section 4.7 and page illustrating FIG. 19.
S. Sasaki et al., "17 Mbits/sec 2 GHz Digital Radio System", Fujitsu Scientific & Technical Journal, Sep. 1980, pp. 1-7.

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