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Passive jammer test proposal.

I thought of a good way for the passive jammer owners to
objectively measure the effectiveness of their devices.

If your jurisdiction uses those unmanned, automatic radar speed
signs which show passing motorists how fast they are going,
you've got the perfect tool for the job - a stable doppler radar set
and a easy to read indication of when your car's speed has been
acquired by it.

Make a series of passes - never mind what the neighbors think -
with and without the jammer installed. Attempt to mark the
point at which the sign picks up your vehicle and displays
your speed. An assistant who could carefully note vehicle
location in response to your call of "Mark" would be a big help.
If you really want to be scientific, arrange a means by which
your assistant can install and uninstall the jammer unobserved
by you. You will be far more objective with your reports of "Mark"
if you have no knowledge of whether jamming is occurring.

Important: Use _exactly_ the same approach path and speed
each time. Additionally, a quiet residential street situation will
be necessary to eliminate interference from other vehicles. And
that's exactly where they are used in my neck of the woods.

I think you jammer users owe it to yourselves to try this.

DeWitt Harrison    de@aztek-eng.com
Boulder, CO
88 5kcstq