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> Additionally, you're leaving the challenge of building the actual Radar Detection to well established companies who know what they are doing. This is probabl
by mjb 16y ago
> Additionally, you're leaving the challenge of building the actual Radar Detection to well established companies who know what they are doing.
This is probably going to become more and more important in future. Both RF and processing electronics are becoming cheaper and more capable - and this will lead to 'smarter' radar technology being affordable in speed-gun type devices. Old-school dump pulse-doppler systems are trivially easy to detect, but there are many radar technologies out there that will present a much bigger challenge. It wouldn't surprise if we soon see PCL (passive coherent location) based speed traps soon. Passive radars like these can use radiators of opportunity (cell towers, TV, FM radio) and don't need to emit any energy of their own. They aren't undetectable, but are much harder to detect.
The point is that radar detection is going to become much harder in future, and while the equipment will probably still get cheaper, the technical sophistication required for detection will increase.
- ovi256 16y agoIf they don't emit any energy of their own, they are undetectable. Unless I'm missing something. You cannot passively detect another passive receiver.
- mjb 16y ago> You cannot passively detect another passive receiver. In general, there isn't really such a thing as a passive receiver. The typical radar receiver design will downmix the incoming signal to some lower frequency (IF) using its 'local oscillator'. Some of the energy from this oscillator will leak out of the receiver and be detectable. This is only one of several possibilities for detecting receivers. So no, not undetectable, but much harder than detecting an active transmitter.
- ruslan 16y agoAre you joking ? How do you distinguish this "leaked oscillation" coming from radar-detector from all other pieces of electronics your car is stuffed up with ? Say, from your car stereo ?
- wglb 16y agoThis is almost always true, but there is at least one interesting exception: http://www.ramseyelectronics.com/cgi-bin/commerce.exe?preadd=action&key=ABM1 http://www.ramseyelectronics.com/cgi-bin/commerce.exe?preadd... I imagine for dedicated listeners, there might be others.