Radio receiver operational checking method and system including

Details Radio receiver operational checking method and system including Radio receiver operational checking method and system including

1991-02-19

1993-08-31

Eisenzopf, Reinhard J.

Telecommunications

Receiver or analog modulated signal frequency converter

Squelch

455 351, 455225, H04B 110, H04Q 700

Patent

active

052416984

ABSTRACT:
A clock-driven pulse source is used to apply repetitive short pulses to the squelch control point of the squelch circuitry of a radio receiver to deactivate momentarily the squelch circuitry at regular intervals (FIGS. 2B, and 2D). The repetitive short pulses being applied to the active squelch circuitry of a radio receiver to deactivate it momentarily at regular intervals may, according to the present invention, be applied directly or through reactive coupling to the antenna associated with the radio receiver (FIGS. 2M and 2N). This provides periodic noise bursts of "de-squelch" pulses on an otherwise silent radio in order to inform the radio operator that the radio is live and that the volume is adequate. A light may also be connected to the system to provide a second, visual, indicator of the operational status of the radio. This radio receiver operational checking system may also be utilized where there are two or more radios in use with a common audio headphone/speaker line, by providing an additional clock-driven pulse source for each radio in use. The system may be arranged so that the status of individual radios may be quickly ascertained by sound and/or by light indicators.

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