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Every body is right and everybody is wrong here...lol Yes if you have a insulated coil big enough under your bike the sensor will likely trigger..if you have a big magnet , or a slab of thick steel,,,they are doing the same thing...namely puting a mass of metal closer to the pavement and interfering with the field. doesn't really matter if it's an RF field or an electomagnetic one..the outcome is the same. Motorcycles first of all have little mass...and what they do have is carried higher than a car. If you stick a 5 lb magnet under the swing arm.. you are just adding to the mass of the bike and also putting that mass nearer the ground. A 5 lb block of steel that was not magnitized would likely have the same effect. Someone wrote here awhile back that they saw a road worker testing the light tripper by placing a large iron skillet on top of the road right over the cut-out where the coil was. Keeping that in mind..you can make your own light tripper by adding any big chunk of metal under your bike...or by wearing a pair of those old diving boots with the cast iron soles....lol Knifemaker

That's pretty much what I was saying earlier... the only way to get the thing to trigger is to add mass. Hard to do on a m/c. A magnet might help if it was big enough, but I think the small, high-powered magnets that have been mentioned won't make much difference. Their magnetic fields are highly concentrated close to the magnet and attenuate rapidly (by the cube of the distance) as you get further away from the magnet. There is another possibility, though. It would involve building an rf oscillator connected to a coil (acting as the antenna) that would produce an rf field with a frequency a little off from the frequency the green light detector uses. This would radically 'detune' the circuit the loop makes with the detector electronics and fool it into thinking there was a larger mass there. It wouldn't have to be very powerful to be effective. 1/2 watt of radiated power should be more than enough. Now that I think about it didn't someone mention that a device like that was available? MokiMan
 
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