RF modem with oscillator switching circuit

Details RF modem with oscillator switching circuit RF modem with oscillator switching circuit

1986-11-17

1988-03-29

LaRoche, Eugene R.

Oscillators

Solid state active element oscillator

Transistors

331162, H03B 532

Patent

active

047346574

ABSTRACT:
A channel switching oscillator circuit (230) in which the oscillator frequency is selected from one of a predetermined number of frequencies by switching into the oscillator circuit (230) one of a plurality of tank circuits (L4, L5, L6). The tank circuit (L4, L5, L6) is resonant with one of a plurality of crystals (Y2, Y3, Y4) in the oscillator (230) to generate a carrier signal at the predetermined frequency. The crystals (Y2, Y3, Y4) remain in the oscillator circuit (230) with no switching thereof as the frequencies at which the crystals (Y2, Y3, Y4) oscillate are sufficiently far apart, coupled with the high Q of the tank circuit (L4, L5, L6), that only one of the crystals (Y2, Y3, Y4) is resonant with each tank circuit (L4, L5, L6).

REFERENCES:
patent: 3614667 (1971-10-01), Fletcher

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