Frequency range selectable oscillator for multichannel communica

Details Frequency range selectable oscillator for multichannel communica Frequency range selectable oscillator for multichannel communica

1975-06-12

1977-02-22

Grimm, Siegfried H.

Oscillators

With indicator, signal, or alarm

1161243, 325 20, 325 25, 325455, 331 18, 331 36C, 331116R, 331177R, 331177V, 334 55, 334 87, H03B 536, H03J 102

Patent

active

040094510

ABSTRACT:
To provide the required multiple channels for an aircraft communications system, a crystal controlled reference oscillator includes a tunable circuit for changing the base reference frequency provided by a crystal. The base reference frequency of the crystal controlled reference oscillator is pulled in frequency by changing the capacitance shunting the crystal. Two transistor switches change appropriate capacitors in series with the usual oscillator capacitor to obtain the capacitance values needed to pull the base reference frequency and thereby provide additional reference frequencies. The transistor switches are controlled by pilot actuated controls that operate a sliding display mark over a digital frequency indicator.

REFERENCES:
patent: 1958282 (1934-05-01), Tregenza
patent: 3103631 (1963-09-01), Ito et al.
patent: 3641461 (1972-02-01), Mrozek
patent: 3778998 (1973-12-01), Berney

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