D
Dr Zoidberg
Guest
Gareth A. wrote:
--
Alex
Hermes: "We can't afford that! Especially not Zoidberg!"
Zoidberg: "They took away my credit cards!"
www.drzoidberg.co.uk www.ebayfaq.co.uk
On Mon, 27 Jun 2005 13:41:18 +0100, "Dr Zoidberg"
AlexNOOOOO!!!!!!@drzoidberg.co.uk> wrote:
driver@somewhere.in.the.uk.com wrote:
Mac <foo@bar.net> wrote:
There's a basic fact I'm missing on this. Does the jammer jam all
the time, or does it wait until it detects an incoming signal and
then start jamming?
It receives passively, and upon detecting a laser it jams it. You
also get an audio warning (which is the bit I've never heard in
several years, although the sounder does work, during the power-up
tests) and then you jump on the brakes and switch the unit off
fast, allowing the PC to get a valid reading.
So it can start jamming the signal fast enough to prevent any return
to the laser gun?
Yes, the commonly used laser speed detection devices (SDD's) send out
30-40 pulses over about a third of a second. They use least-squares on
the time of flight to calculate the speed of the vehicle. The jammer
would be active after the first few pulses are detected and produces
signals which frustrate the detector portion of the SDD.
Interesting , thanks.
--
Alex
Hermes: "We can't afford that! Especially not Zoidberg!"
Zoidberg: "They took away my credit cards!"
www.drzoidberg.co.uk www.ebayfaq.co.uk