Currency alarm pack having receiver automatic gain hysteresis

Details Currency alarm pack having receiver automatic gain hysteresis Currency alarm pack having receiver automatic gain hysteresis

1994-09-28

1995-09-05

Swann, Glen

Communications: electrical

Condition responsive indicating system

Specific condition

109 29, 109 31, 109 32, 109 38, 340522, G08B 13181

Patent

active

054482232

ABSTRACT:
A currency alarm pack for triggering an alarm to foil a bank robbery consists of a receiver for detecting an electromagnetic field at the exit of a bank and a circuit which activates an alarm to release dye and/or tear gas when the alarm pack leaves the field. The receiver has automatic gain control hysteresis causing its gain to increase when it first detects the field so that it automatically locks onto the field. This reduces the chance of activation of the alarm pack inside a bank if the robber does not exit the bank immediately.

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