Automatic balancing system for communications receiver apparatus

Details Automatic balancing system for communications receiver apparatus Automatic balancing system for communications receiver apparatus

1984-12-27

1990-09-11

Groody, James J.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

455183, H03J 708

Patent

active

049567110

ABSTRACT:
The individual radio frequency filters are balanced successively by application of an auxiliary frequency at the antenna input. The auxiliary frequency is disposed between the frequency of the picture carrier and the sound carrier of the selected channel. The resulting intermediate frequency is disposed in the intermediate frequency region between the picture and sound intermediate frequency. The measurement voltage is picked up at the automatic gain control output of the radio frequency amplifier. The reference circuit is switched with regard to its frequency to the intermediate frequency during the balancing. The capacitance at the automatic gain control output is decreased during that time.

REFERENCES:
patent: 4334323 (1982-06-01), Moore
patent: 4590611 (1986-05-01), Maier et al.
Klank, AM-Spezialempfanger fur den Frequenzbereich O,15-30 MHz, 1968, pp. 773-776.
Hasselt, IC-FM-Empfanger mit dem CA 3089, Oct. 1972, pp. 1035-1039.

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