Multiple band scanning radio

Details Multiple band scanning radio Multiple band scanning radio

1974-12-02

1976-02-24

Libman, George H.

325442, 325462, H04B 126

Patent

active

039406970

ABSTRACT:
To scan channels in a plurality of bands using a single first mixer, an FET transistor in an adaptive first mixer of the scanning radio, in response to a signal from a counter in the scanning local oscillator representing the frequency band of the channel being scanned, has: (1) its gate electrode connected to the output of a selected RF amplifier of a plurality of RF amplifiers for different bands; and (2) its source electrode electrically connected to receive local oscillations through a selected one of a plurality of different impedance networks. These connections enable the adaptive first mixer to maintain sufficiently high conversion gain when receiving signals on channels in any one of a plurality of different frequency bands.

REFERENCES:
patent: 3348154 (1967-10-01), Fish, Jr. et al.
patent: 3443230 (1969-05-01), Pratt
patent: 3631348 (1971-12-01), Lehmann
patent: 3801922 (1974-04-01), Muszkiewicz
patent: 3845393 (1974-10-01), Basset

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