Two-way MMDS communications system

Details Two-way MMDS communications system Two-way MMDS communications system

1993-06-28

1994-11-29

Kuntz, Curtis

Telecommunications

Interference signal transmission

455 62, 455 86, 348 10, 348 12, H04H 100, H04B 140, H04N 714

Patent

active

053697790

ABSTRACT:
A first mixer block converts received MMDS channel frequencies to MMDS frequencies capable of being processed by an MMDS decoder. The MMDS decoder, which includes a crystal controlled reference generator, is located in a benign environment. The reference is supplied to a phase locked loop for controlling a fixed frequency local oscillator that supplies the first mixer. The local oscillator output is also supplied to a second mixer that produces a response signal, of a different frequency, by biphase shift key modulation of said reference that is transmitted back to the transmitting site via the antenna. A squelch circuit precludes transmission of the unmodulated reference.

REFERENCES:
patent: 3886302 (1975-05-01), Kosco
patent: 4907291 (1990-03-01), Yamamoto
patent: 5001554 (1991-03-01), Johnson et al.
patent: 5101267 (1992-03-01), Morales-Garza
patent: 5170490 (1992-12-01), Cannon et al.
patent: 5300941 (1994-04-01), Hemmie et al.
Consumer IC Handbook, GEC Plessey, Sep., 1991, pp. 8-4 through 8-9.

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