Self test circuit for multichannel radio receivers

Details Self test circuit for multichannel radio receivers Self test circuit for multichannel radio receivers

1976-11-10

1977-11-29

Griffin, Robert L.

Modulators

Amplitude modulator

Nonlinear device controlled by modulating signal

325 67, 332 17, H04B 1700

Patent

active

040607674

ABSTRACT:
A simultaneously amplitude modulated and frequency/phase modulated harmonic ignal generator incorporated in a multichannel AM-FM radio receiver which will indicate to the operator whether or not the receiver is sensitive and is operative to receive signals within any of a plurality of designated channels. The circuit includes a transistor switch which is periodically driven on and off by means of an input signal having a frequency equal to the channel spacing of the receiver and being further controlled by means of an audio frequency signal which is adapted to further modulate the turn-on point of the transistor switch. The signal appearing at the collector of the transistor is fed through a high pass filter to the receiver input as an AM and FM waveform which contains a harmonic at every channel of the receiver and thereby providing a self testing function for the receiver.

REFERENCES:
patent: 3406343 (1968-10-01), Mehlman
patent: 3602819 (1971-08-01), Abbott
patent: 3605022 (1971-09-01), De Fillipo

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