Variable rate tuning for radio transmitters and receivers

Details Variable rate tuning for radio transmitters and receivers Variable rate tuning for radio transmitters and receivers

1980-02-13

1982-09-28

Thesz, Joseph M.

Registers

Platform operated

Platform actuated traffic counters

235 92PL, 235 92DE, 455185, G06M 314

Patent

active

043520103

ABSTRACT:
A variable rate tuning circuit of the type which may be used to control the frequency of transmitters, receivers, and transceivers includes a manually rotatable dial (15) connected to a pulse generator (20) the output of which produces pulses directly proportional to the amount of dial rotation. These pulses are applied directly to a frequency determining counter (10), and the pulse rate is such that fine resolution over the frequency of the device may be obtained directly from rotating the dial slowly. Large changes in frequency may be made by rotating the dial rapidly. The output pulses pass through a differentiator (40), and integrator (30) to a voltage-to-frequency converter (35). The faster the dial is rotated, the larger will be the analog voltage output of the integrator, thus the higher the output frequency of the converter (35). The output of the converter is also applied to the frequency determining counter (10). Therefore, the amount the counter is incremented or decremented with respect to the amount of dial rotation is a function of the speed at which the dial is rotated.

REFERENCES:
patent: 3835384 (1974-09-01), Liff
patent: 3843873 (1974-10-01), Beville et al.
patent: 3878488 (1975-04-01), Blythe et al.
patent: 4270117 (1981-05-01), Ziegelbein et al.
"Programmable Synthesized Receiver", Model RA 1792, Manufactured by Racal Communications, Ltd., Manufacturing Brochure 1979.

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