junk@ur-tut.UUCP (Jan Vandenbrande) (02/25/86)
.... The Robert Bosch Co. sells a modular alarm system. You buy a basic system and you can add the motion sensor module, the ultrasonic module (+others???). They are as usual expensive, but seem to be of rugged & sound design. (For example, if you jump or cut the wires to the key switch, the alarm will go off, whether the alarm is armed or not. Same thing with the radio. The alarm will go off when someone tries to steal the radio, whether the alarm is armed or not. I am not sure if this is a common feature with other alarms.) Instead of opting for a motion sensor, consider an ultrasonic detector in the car's passenger compartment. When the car is rocked it will probably not go off unless your seatbelts wiggle sufficiently, or something falls over; but it will raise hell if someone tries to enter the car in an unorthodox manner (without opening the doors). (Problem=> what if a moth is in the car...) In general I don't think there is a fool proof alarm system. If a "profesional" thief wants to get your car, he will. You just want to scare off the small time thieves. Another piece of advice: do connect the alarm to your lights or hazard lights. Ever heard an alarm go off on a large parking lot without the lights flashing? It is very hard to identify where the noise is coming from. Good luck, Jan.