Originally Posted by codprawn
I think the active type take the already transmitted signal and amplify it. They don't actually send a new signal out!!!
If that is the case - which it probably is - then how fast does the circuitry in these units work - ie how fast does the signal get read then amplified and then retransmitted.
If it took a mili-second to retransmit the signal when it bounced back would appear to have come from approximately 300 kilometers further away.
If it took a micro-second the inacuracy would still be 300 meters.
Are the electronics in these things really going quick enough to respond in nano-seconds which is what would be required to maintain accuracy.
Or do they work in a completely different way???