device to set off radar detectors
Milhouse Van Houten
Does anyone know of a device I could use to set off radar detectors in
the cars behind (or maybe in front of or to the side) my car?
I read something about this phenomenon, and a gadget called a
Gunnplexer or something. I also heard that old burglar alarms will do
it. I was hoping something I could construct from Radio Shack parts
would do the trick.
Any suggestions, besides the obvious one of purchasing a radar gun?
:-)
Scott
Robert Wuest
I can't imagine why anyone would want to do this, unless they were just
wanting to be an obnoxious jerk. No help from me (although, it'd be
pretty easy).
--
Robert Wuest, PE Empowered Kemet Electronics
Sirius Engineering Company by rober...@kemet.com
mailto:rwu...@ix.netcom.com Linux
gjdrec
I too have seen this advertised, and as far a I can tell, they are
nothing more than a 10 Ghz transmitter (I could be wrong, though).
Corey Drechsler
Thomas Goetzman
I too, have a device like this, it's a microwave transmitter, a Gunn
Diode, to be exact. IT transmits in the X-radar band, I believe. It was
in an old motion-detector in an alarm system. I don't think these are
used anymore, seems that infrared systems, like in outdoor ligts, are
becomming more popular. Espessialy with the growing disconsent over
Microwaves.
charlie G.
(tgoe...@lax.net)
Steve J. Noll
Scott:
Okay, I'll confess. I built one of these once. I mounted it inside
some plastic trim near a tail light on my Stanza wagon. Wired it
arcoss the rear window defogger so I had control over it from the
driver's seat. It was totally hidden - you'd have to take the car
apart to know it was there.
I used a X-band Gunn oscillator. It was the size of about a one-inch
cube. These are available surplus. They (still) are used in
automatic door openers and some burglar alarms. Gunn diodes
typically take between 5 and 15 volts DC. Most of the ones you'll
find are on or near enough to the correct frequency - around 10.525
GHz. You would have a real problem working with them if you don't
have any test equipment. I have a spectrum analyser that goes that
high, and power meters that work there too, so it wasn't a problem for
me. I've seen Gunn oscillators them at swap meets. Also, someone
sells a device in magazine ads just for this purpose.
You don't need a genuine Gunnplexer - that's a M/A-Com product that
can both transmit and receive microwaves. More than you need.
I don't endorse doing what you want to do. But I endorse even less
using a radar detector for the purposes of speeding, risking my life
and other's lives, and avoiding getting caught!
Anyway, my "experiments" with one of these devices were not all that
interesting. Here in Southern California there is not a tremendous
use of radar. Most cars don't have a detector. I was surprised to
see that most of the cars that have a detector don't have them turned
on. And finally, some of the drivers that turn them on ignore them
when they go off! I got very very few "reactions" from my 10 GHz
transmitter. Your results may vary.
There are other ways to generate the required 10 GHz or 24 GHz signals
- Impatt oscillators and Dielectric Stabilized Oscliiators to name a
couple. But Gunn Diode oscilators are probably still the most common.
I don't know of anything you would find at a Radio Shack that would
get you there.
Steve J. Noll | Ventura CA | WA6EJO | sjn...@ix.netcom.com
| http://www.netcom.com/~sjnoll/usedequip.html
| http://www.netcom.com/~sjnoll/peltier.html
james e
In article <5auv9j$3...@dfw-ixnews6.ix.netcom.com>, sjn...@ix.netcom.com
says...
Steve,I'll bet that people who use radar detectors are safer drivers than
people who use cell-phones while driving. Radar detector users are more alert
and 'on the ball' than your average driver. You have more to fear from people
who change lanes without looking than radar detector users.
Jim Yanik
Trash
In article <32D1EE...@pacifier.com>, gjd...@pacifier.com wrote:
>I too have seen this advertised, and as far a I can tell, they are
>nothing more than a 10 Ghz transmitter (I could be wrong, though).
>
>Corey Drechsler
It depends on the radar detector, some will ignore X-band signals.
Any microwave oscilator will do the job, you should be able to get
them at any good electronics disposal shops. You may also have
to retune them just a bit for best results.
One of the best sources for microwave signals is a radar detector
itself. Just find yourself an old radar detector and sit it in front
of a new radar detector (about 15 to 30 feet away) and retune the
old radar detector untill the new one beeps it's guts out.
Then just use it on your victums at you leisure :)
- Ash
aa-2@deltanet.com@deltanet.com
In <5auv9j$3...@dfw-ixnews6.ix.netcom.com>, sjn...@ix.netcom.com (Steve J. Noll) writes:
>Scott:
>
>Okay, I'll confess. I built one of these once. I mounted it inside
>some plastic trim near a tail light on my Stanza wagon. Wired it
>arcoss the rear window defogger so I had control over it from the
>driver's seat. It was totally hidden - you'd have to take the car
>apart to know it was there.
>
>I used a X-band Gunn oscillator. It was the size of about a one-inch
>cube. These are available surplus. They (still) are used in
>automatic door openers and some burglar alarms.
>Anyway, my "experiments" with one of these devices were not all that
>interesting. Here in Southern California there is not a tremendous
>use of radar. Most cars don't have a detector. I was surprised to
>see that most of the cars that have a detector don't have them turned
>on. And finally, some of the drivers that turn them on ignore them
>when they go off! I got very very few "reactions" from my 10 GHz
>transmitter. Your results may vary.
There's a very good reason why detector owners ignored you. Very few
cops in southern California are still using X-band radar, while there are
a ton of door openers and burglar alarms using X-band.
I am pleased to report that it's much harder to find ready-built K-band
microwave sources.
Jon Jenkins
...snip
> >
> >Anyway, my "experiments" with one of these devices were not all that
> >interesting. Here in Southern California there is not a tremendous
> >use of radar.
That is because the X band radars went out of *popular* use by HP many
years ago due to interferance from such devices as auto door openers.
Also narrow band is a more of a problem at 10GHz. Now in my country
and I presume mnany others the HPs use K (24.524) and Ka (33.2) band
radar devices exclusively. Most newer radar detectors have
capability to turn off X band reception by default to stop
false alarms. So this is probably why your 10GHz exp failed.
As to your other comment regarding speeding etc and associated
reactions.
I do not think it is the actual use of the radar which causes problems
rather I think it is the way they are used by HP: to maximise
revenue rather than minimise accidents. Take for example a new
radar deployed by the local HP in my state: this radar can
(supposedly) take a single picture with up to 4 vehicles (2 coming
and 2 going, i.e. a 4 lane road) in it and place an arrow with
an annoted speed beside each vehicle in the pic. Problem is
that this radar is obviously intended for city/suburban use
with 4 lane roads. Most serious accidents and fatalities happen
on dual lane non urban roads. In the first month of operation
the units booked an average of 1800 cars per day, 95% of which
were within 6kmh of the posted speed limit. Ergo it would seem
that the major purpose of the new radar is to collect revenue
as opposed to reducing speed related fatalities. I suspect this
is common to all HPs in the Western world.
Jon
PS
If anyone knows the intimate details of how these these
multivehicle radars work I would be very interested to know too.
--
---------------------------------------------------------
Name: Dr Jon Jenkins
Org: Academic Technologies Bongaree Rd,
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----------------------------------------------------------
Scott Doerger
On 8 Jan 1997 12:06:46 GMT, james e ya...@tek.x.com..... (Jim Yanik)
wrote:
>
>Steve,I'll bet that people who use radar detectors are safer drivers than
>people who use cell-phones while driving. Radar detector users are more alert
>and 'on the ball' than your average driver.
I've heard that before, and it may have some validity to it. However,
common sense tells me that the higher the velocity of a vehicle, the
more prone it is to not be able to stop in time before hitting
something else.
>You have more to fear from people who change lanes
>without looking than radar detector users.
Yes, and now the detector users fear me--I just got a Zapper II from
the Edge Co. I recommend it to all who love the soft glow of brake
lights on the interstate :-)
Scott
Frank Reid
"Aha! The alien Zorg battle-cruiser's BMW disguise is flawed by a
suspicious lump on the dash. Set Nuclear Nerd Neutralizer to medium-well!"
--
Frank re...@indiana.edu
formerly known as jeff feigin
mount a spark plug in a wave guide, drill a hole and tap it. screw a
screw in and tune for resonance.
jeff
__/\ /\ /\ /___/""\~~~^^^\ %""";;;: !! !+++-____ __/\ /\ /\
| | \/ \/ \/ W \/ ! | | \/ \/
|____| |____|
FAMOUS QUOTES:
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:::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
Bergum
fran...@cinti.net (Milhouse Van Houten) wrote:
>Does anyone know of a device I could use to set off radar detectors in
>the cars behind (or maybe in front of or to the side) my car?
Use the radar in the automatic door opener.
Trash
In article <32D657...@onthenet.com.au>, Jon Jenkins <acad...@onthenet.com.au> wrote:
>Jim Yanik wrote:
>>
>> In article <5auv9j$3...@dfw-ixnews6.ix.netcom.com>, sjn...@ix.netcom.com
>
>
>> >
>> >Anyway, my "experiments" with one of these devices were not all that
>> >interesting. Here in Southern California there is not a tremendous
>> >use of radar.
>
>That is because the X band radars went out of *popular* use by HP many
>years ago due to interferance from such devices as auto door openers.
>Also narrow band is a more of a problem at 10GHz. Now in my country
>and I presume mnany others the HPs use K (24.524) and Ka (33.2) band
>radar devices exclusively. Most newer radar detectors have
>capability to turn off X band reception by default to stop
>false alarms. So this is probably why your 10GHz exp failed.
None of the Australian police forces have used Ka Band radar. Yet !
The X band cutoff was because everytime you drove past a shopping centre
you X-band would pick up the automatic doors and start beeping :)
....... snip again !
>PS
>If anyone knows the intimate details of how these these
>multivehicle radars work I would be very interested to know too.
>
I'm not so sure that the new radar can "label" each vehicle in the
photo with its speed. If somebody gets caught... please scan the
photo in and post it to the newsgroups.
If you are looking for a techincal description on how the new radar
works, I would suggest looking for material on how CDMA
[Code Division Multiple Access] or Spread Spectrum radar works.
This is the same radar system used in the Patriot missile systems.
I am familiar with how it works, but I have no reading material on
CDMA radar. If you find any, please let me know.
Thanks - Ash
Trash
>I am pleased to report that it's much harder to find ready-built K-band
>microwave sources.
>
Not true... every K band radar detector has a very nice oscilator that is
perfect for the generation of 24GHz !!
You just have to know where to look !!
- Ash
Trash
In article <19970111113839.reid@frank_reid.electronics.indiana.edu>, re...@indiana.edu (Frank Reid) wrote:
>
>I've worked 46 states on 10 GHz. ;-)
>"Aha! The alien Zorg battle-cruiser's BMW disguise is flawed by a
>suspicious lump on the dash. Set Nuclear Nerd Neutralizer to medium-well!"
>
2.450 GHz x 10 = 24.50GHz ...... close !!
so... rather than just jam police radar.... GIVE THEM A SUN TAN !!!
microwave oven magnetron mounted on the front bumper with a dirrectional
antenna, so you don't fry yourself. I would think that the front end mixer
of the police radar would not like to see 400 watts of signal in the
waveguide.
correction: Set Nuclear Nerd Neutralizer to "Thermonuclear meltdown" !!
Of course I don't advise this unless you are a fully qualified practising
idiot, or you are the unabomber looking for a new hobby ?
- Ash
Trash
In article <5b02km$h...@bvadm.tek.com>, james e ya...@tek.x.com..... (Jim Yanik) wrote:
>Steve,I'll bet that people who use radar detectors are safer drivers than
>people who use cell-phones while driving. Radar detector users are more alert
>and 'on the ball' than your average driver. You have more to fear from people
>who change lanes without looking than radar detector users.
>
>Jim Yanik
>
Or even Police that do erratic U turns and use the same (and more so)
excessive speed to catch the original offenders.
Two wrongs really do make a right !!
But don't worry folks... the Highway Patrol are slowly fading away. Years of
exposure to their own RF sources will see them slowly die off.
The devil always gets his own back.
I'll have my pork medium rare please !!
- Ash
Chris Crochet
Hehehe.. I was following a pi... er, police officer <g> once on the
interstate... He was driving 70 in a 55, with his emergency lights off,
which is illegal even for the police. Which is kind of cool, because
since they're breaking the law, they usually won't try to stop you for
following at the same speed. Usually.
Turns out he had a *rear-mounted* radar (sneaky bastard), and the por..
um, police officer <beg> decided he'd pull me over.. so he pulled into
the next lane to the left, dropped back to be right beside me, flipped
on his lights, and started trying to wave me over to the side of the
road...
In fact, he was so busy trying to wave me over, that he never saw the
couch fall out of the back of the pickup truck that was in front of him,
until it was too late.
Needless to say, I didn't get a ticket. But I think the officer got
just what he deserved! :)
Chris C.
Jon Jenkins
Trash wrote:
>
> In article <32D657...@onthenet.com.au>, Jon Jenkins <acad...@onthenet.com.au> wrote:
> >Jim Yanik wrote:
> >>
> >> In article <5auv9j$3...@dfw-ixnews6.ix.netcom.com>, sjn...@ix.netcom.com
> None of the Australian police forces have used Ka Band radar. Yet !
> The X band cutoff was because everytime you drove past a shopping centre
> you X-band would pick up the automatic doors and start beeping :)
WA HP used Swedish based Ka in their bridge/overhead mounted cameras.
There
were tech problems so I am not usre if still used. NSW and Vic also
trialled
them byt never deployed.
snip...
> I'm not so sure that the new radar can "label" each vehicle in the
> photo with its speed. If somebody gets caught... please scan the
> photo in and post it to the newsgroups.
It certainly does, have not been booked myslef but have seen photo:
3 cars in photo all with annotation arrow and associated speed at top
> If you are looking for a techincal description on how the new radar
> works, I would suggest looking for material on how CDMA
> [Code Division Multiple Access] or Spread Spectrum radar works.
> This is the same radar system used in the Patriot missile systems.
This is how I thought it worked but assumed it was too expensive.
However
I saw an article in the newspaper the other day which mentioned Benz
will
put 16 radar sensors with integrated DSP based 3D spatial warning
systems
in their year 2000 models :-0 So I suppose it is not so expensive after
all.
Jon
UN93B
Trash wrote:
>
> In article <19970111113839.reid@frank_reid.electronics.indiana.edu>, re...@indiana.edu (Frank Reid) wrote:
>
> >
> >I've worked 46 states on 10 GHz. ;-)
> >"Aha! The alien Zorg battle-cruiser's BMW disguise is flawed by a
> >suspicious lump on the dash. Set Nuclear Nerd Neutralizer to medium-well!"
> >
>
> 2.450 GHz x 10 = 24.50GHz ...... close !!
800 watt microwave oven in the garage. I would rather mount it behind
the front grill to give a normal appearance.
Wonder if my plastic grill would absorb some of the RF since some
plastics seem to do just that.
Caution would need to be taken for fear of radiating someone with a pace
maker.
Brett
Trash
John Lundgren
Trash (tr...@magna.com.au) wrote:
Automatic door openers are a bit expensive. No, five finger discount is
illegal.
Use one of those boxes sold in the back of the electronics magazines like
Nuts & Volts. They're under $50.
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Ed Price
UN93B wrote:
>
> > I'm tempted to try this. I have a 1 KW inverter and an old
> 800 watt microwave oven in the garage. I would rather mount it behind
> the front grill to give a normal appearance.
>
> maker.
>
> Brett