a guy at our club made his own transponder system.. in theory it worked well, however it was more or less a mini radio transmitters with a low output in the car & an ariel system to make a timing beam across the track hooked up to a computer.. had to scrap it in the end because the cars were triggering the beam from numerous places as soon the ariel picked up a signal as the radio waves bounced off walls & the like.
I'd love to get a schematic diagram for a system such as the AMB system & have a go at making one myself because i dare say a DIY unit would be a lot cheaper than the real thing.
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