Frequency modulators for use in microwave links

Details Frequency modulators for use in microwave links Frequency modulators for use in microwave links

1978-11-17

1981-06-02

Grimm, Siegfried H.

Multiplex communications

Wide area network

Packet switching

331107A, 332 21, 332 22, 332 26, 370 75, 455 22, 455 42, H04J 104, H04J 108, H04J 114

Patent

active

042715040

ABSTRACT:
Frequency modulators for use in microwave link transmission systems include acoustic surface wave (ASW) oscillators. Each frequency modulator comprises two voltage control quadripole ASW oscillators. Control inputs of the two ASW oscillators receive modulation signal in opposite phase. Outputs of ASW oscillators are mixed in a mixer for delivering an IF signal. Thus frequency deviation is larger than in a conventional arrangement. Moreover, surface wave oscillators make it possible to directly insert a service channel signal in a microwave link repeater, without demodulation and modulation operations.

REFERENCES:
patent: 3249897 (1966-05-01), Trilling
patent: 3855548 (1974-12-01), Nandi et al.
patent: 3936765 (1976-02-01), Lewis et al.
Marazzi et al., "Thin Film Injection-Locked Oscillators as Amplifying Stages in 2-GHz Radio Repeaters," IEEE International Solid-State Circuits Conference, vol. 14, Feb. 1971, pp. 26-27.
Otala, "Distortion and its Compensation in a Varactor-Controlled Frequency Modulator," Proceedings I.E.E., vol. 117, No. 2, Feb. 1970, pp. 338-342.

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