Electronic Security Systems. Better Ways to Crime Prevention by Philip Walker

By Philip Walker

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Sample text

Only because Nature has provided, or man has made, receivers. The eye is a receiver of light. The ear is a receiver of sound. The saucepan is a receiver of heat. A transistor radio is a receiver of what? So far we have two words - 'transmitter' and 'receiver' - that have meanings in everydaylife and also have meanings in the field of electronic security equipment. Sound generation and reception Play the note middle C on the piano. To the human ear it is a lovely rich sound. But also it is a string or wire, of definite length and definite tightness.

The now-active detection system thinks he is an intruder, and so another false alarm is recorded. There seems to be only one satisfactory answer to this problem of human nature, and this is examined in Chapter 21. Briefly, it involves using the central control panel to switch on everything, including local audible alarms, but excluding the remote alarm signalling circuit to the police or central station. The remote signalling circuit is connected through only when the final door of exit has been locked closed from the outside.

If he buys a mowing machine, or she buys a sewing machine, the user knows what to expect of the machine, and is soon in no doubt whether it does or does not work as it should. It is not so straightforward with security systems. There is the everpresent hostile environment created by the villain, who has a vested interest in seeing that the system does not work; there is the communication link between the system and the police which is outside the control of both parties; and the police may be too busy elsewhere to react in time to an alarm call.

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