Multichannel frequency modulator

Details Multichannel frequency modulator Multichannel frequency modulator

1980-07-14

1984-04-10

Grimm, Siegfried H.

Modulators

Amplitude modulator

Nonlinear device controlled by modulating signal

331116R, 331161, 331177V, 331179, 332 26, 332 30V, H03C 322

Patent

active

044424159

ABSTRACT:
A single Colpitts-type oscillator has a plurality (here, three) of optional inputs, each having a separate oscillating circuit individually associated therewith. By suitably applying a potential to a selected one of the oscillating circuits, the oscillator may be made to produce one of a plurality of predetermined carrier wave frequencies. The inventive circuit configuration eliminates large volume components such as coupling capacitors and enables hybrid IC construction, which miniaturizes the circuit. The circuit is particularly useful in walkie-talkie FM transceivers.

REFERENCES:
patent: 3579281 (1971-05-01), Kam et al.
patent: 3581240 (1971-05-01), Enderby
patent: 3631364 (1971-12-01), Schilb et al.
patent: 3974452 (1976-08-01), Cunningham
patent: 4055822 (1977-10-01), Rinderle
Motorola Service Manual No. 68P81071A90 for "Handie-Com," MH70 Series FM Radio, 1-11-72, pp. 8-10.

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