Belar Audio sentry model AS-1

The Belar AS-1 audio sentry is an all solid state audio modulation sensor designed to alert the operator to the lack of modulation in a communications system. The AS-1 also may be connected to indicate a carrier-off condition with no time delay before alarm initiation. The AS-1 is intended to complement existing modulation monitoring systems in AM, FM and TV facilities as well as in recording studios , public address and storecasting installations.

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