Circuit arrangement for digital frequency indication in a radio

Details Circuit arrangement for digital frequency indication in a radio Circuit arrangement for digital frequency indication in a radio

1974-11-21

1976-04-06

Mayer, Albert J.

325317, H04B 106

Patent

active

039493075

ABSTRACT:
In a circuit arrangement for digitally indicating the tuned frequency of a radio receiver operating in the AM and FM ranges in which the oscillations of the AM tuning oscillator and of the FM tuning oscillator are amplified, converted to rectangular oscillations, counted by means of electronic counters and then digitally displayed, the oscillations of the AM tuning oscillator and the oscillations of the FM tuning oscillator are amplified by a common broadband amplifier which is sufficiently broadbanded so that the oscillator frequencies for the AM range as well as those for the FM range are both passed and amplified and the coupling of the input of the broadband amplifier to the outputs of the tuning oscillators is so loose that the tuning oscillators are not noticeably detuned by changes in capacity in the broadband amplifier.

REFERENCES:
patent: 3417341 (1968-12-01), Elias
patent: 3509484 (1970-04-01), Basse
patent: 3702968 (1972-11-01), Sawairi et al.
patent: 3753119 (1973-08-01), Close

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