Re: A secondary -but planned!- use for the speed-detecting radar signal?
- From: Jim Yanik <jyanik@xxxxxxxxx>
- Date: 26 Mar 2007 23:27:25 GMT
"Ramon F Herrera" <ramon@xxxxxxxxxxx> wrote in
news:1174947676.956366.164110@xxxxxxxxxxxxxxxxxxxxxxxxxxxx:
We all know the primary use of a speed-detecting radar signal used by
law enforcement. The signal is bounced off vehicles in order to
measure their speed. I believe, however, that here are, a few other
(intended?, unintended? bug? feature?) by-products of such signals.
- When I drive near any mall, the signal to detect customers and open
the store doors automatically triggers a false positive in my radar
detector.
Those door openers are radar tranceivers just like in a radar gun,same
operating band,too. Gunn oscillators.
- When an ambulance is running, there is also a detectable signal
going on.
Ambulances have a low power xmtr installed so that cars with RDs would be
alerted to their approach.IIRC,the Road Rangers(emergency breakdown
service) also have them.They don't measure speed,just send a signal.
- In some toll booths the signal is also present, even though there
are no cops or anything related nearby (there is no need for the speed-
measuring aspect).
such toll booths often have speed measuring cameras to give you a ticket
for exceeding the toll plaza SL.
Therefore, I speculate that perhaps there is an intended use by the
radar designers. When the ambulances are running in emergency mode,
the signal is a way to tell drivers to move away, to slow down, etc.
BUT (and this is the key issue) the ambulance has no way to detect the
speed of anybody.
No. all the RD responds to is a radar signal in the appropriate band,it
could be a door opener,a "code practice oscillator"(an item sold for sloths
to set off speeders RDs,now illegal.The signal need not be "measuring
speed.)
Some friends of mine claim -with no evidence
whatsoever- that ambulances have a signal to turn on green lights
along their route and this signal "happens" (just by sheer
coincidence) to be in the same band as the speed-detecting radar
signals.
No,that light changing is done by IR flashing of the emergency lights on
the ambulance or police cruiser. Gated apt. complexes have them too,so fire
and EMT vehicles can enter without knowing the gate code or needing a key.
Mine does,so does the complex next door.
(Google "MIRT")
Frankly, I find that very hard to believe. The mall door are perhaps a
coincidence (are they, really?), but the design of a remote street
light changer (with all the dangers that an unexpected asynchronous
light change implies) which by error just happens to be the same
frequency!? Come on!
The door openers operate by monitoring the reflected signal level;once it
reaches some level,the door is opened.There are handheld LED devices sold
online that change traffic signals from a distance;it's now a Federal crime
to possess them in a motor vehicle,and most states also have their own laws
on that.
I claim that the whole thing is planned:
You are wrong.
I remember reading in the
Boston news that a guy fell asleep and crashed into a toll booth,
killing the attendant. Don't know the details, but such sad accidents
could be prevented by having a radar detector triggering (NOT
measuring I insist) to turn on the beeper in the sleeping guys' car.
Any comments, informed guesses?
-Ramon
ps: which ones would be some pertinent NGs to post this?
--
Jim Yanik
jyanik
at
kua.net
.
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