1975-07-29
1977-03-15
Safourek, Benedict V.
H04B 140
Patent
active
RE0291544
ABSTRACT:
The invention pertains to means for selecting transmit and receive frequencies in a multi-channel transceiver. The superheterodyne-type receiver includes a mixer and a crystal controlled oscillator to provide a variable frequency signal to the mixer, while the transmitter employs a separate crystal control oscillator to provide an appropriate signal to the modulator. Elements of a first bank of crystals are individually connected to the mixer oscillator by the action of two stepping switches which are alternately operable, through the action of a load switch, to forwardly bias a diode connected in series between one of the crystals and the oscillator. A mode switch grounds one side of either of the stepping switches to render it capable of biasing the diode into conduction. A second bank of crystals is selectively connected to the modulator oscillator by means of a third stepping switch which is mechanically ganged to one of the receive stepping switches. In one mode of operation, the receive stepping switch which is ganged into the transmit stepping switch is rendered operable by the mode switch so that a receive channel is automatically selected along with a particular transmit channel. In the alternate mode of operation, the receive switch, which is independently actuated, is connected to ground, thereby permitting the selection of a receive channel independently of the choice of a particular transmit channel.
REFERENCES:
patent: 2840714 (1958-06-01), Wulfsberg
patent: 3248652 (1966-04-01), Kruse
patent: 3413554 (1968-11-01), Yates
Regency Electronics Inc.
Safourek Benedict V.
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