Driveway alarm - Saab General Bulletin Board - Saabnet.com
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Driveway alarm
Posted by BobS (more from BobS) on Thu, 6 Feb 2014 19:57:23
In Reply to: Modern equivalent of old fashioned Gas Station Hose, MI-Roger [Profile/Gallery]
, Thu, 6 Feb 2014 14:37:18
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We have an electronic driveway alarm that senses disturbences in the earths magnetic field when something magnetic passes nearby. Chose it because of wild life and other potential optical issues. It uses a iron armature wound with thousands of turns of fine wire that generates a signal with changes in the earths magnetic field. It works well with cars and even steel toed shoes or similair size metal objects. A buried coax cable carries the signal to a control box in the garage. It is made by an outfit in Indiana, don't recall the manufactures name, I'm not home to look it up.
posted by 76.101.139...
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