Radio receiver alignment indicator

Details Radio receiver alignment indicator Radio receiver alignment indicator

1978-02-09

1980-11-04

Martin, John C.

Telecommunications

Receiver or analog modulated signal frequency converter

Measuring or testing of receiver

455 67, 455154, H04B 106

Patent

active

042323983

ABSTRACT:
A predetermined frequency alignment signal and a white noise source signal are alternately switched through the intermediate frequency amplifier stage (IF) of the receiver being aligned. A series connected integrating capacitor and tuning meter couple between the receiver's detector output and ground potential.
In operation, during the interval of white noise being applied to the IF the tuning meter is shorted and the capacitor is charged to a net voltage V.sub.n which is representative of the center frequency of the IF. When the alignment signal is applied to the IF, the tuning meter short is removed and a signal V.sub.s appears across the capacitor-meter circuit, whereby the meter reading is indicative of V.sub.s -V.sub.n which represents relative receiver alignment.

REFERENCES:
patent: 3273065 (1966-09-01), Stover
patent: 3486112 (1969-12-01), Bayer
patent: 3487313 (1969-12-01), Cushman et al.
patent: 3506915 (1970-04-01), Harris
patent: 3564420 (1971-02-01), Webb
patent: 3628151 (1971-12-01), Roeder
patent: 3631346 (1971-12-01), Riggs
patent: 3875328 (1975-04-01), Gibson et al.

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