Radar Jamming

[Charles Edmondson]

Andy wrote:

Anyway, I designed the TIRIS system in use in California ( Title 21)
and that's how it works. The 5.8 Ghz
system I designed was for Europe, because they didn't like 915 Mhz.
And I used the "re-transmit" method
to get a credit sized toll tag for that application. The read range of
either system with a 1 watt illuminator
was about 40 feet max, with a 200 sq cm RCS change.......


Andy (retired from Texas Instruments)

Andy,

So, did you every visit the California site during the installation (So.
Cal, not the bridge?) If so, we probably met! I was in charge of
design and installation of the toll equipment, including the FastTrak
antennas!

Charlie
Edmondson Engineering
Unique Solutions to Unusual Problems

 

[Pooh Bear]

DaveC wrote:

On Fri, 15 Apr 2005 01:26:58 -0700, Pooh Bear wrote
(in article <425F7AD2.28FB67BD@hotmail.com&gt:

Best advice ( dunno if they're available over there yet ) is to get a
GPS based device that compares your location with all known speed trap
sites.

And how would you know about the "known" traps? If I've driven by them before
(personal knowledge of the trap), I wouldn't need GPS.

You got a list of them?

Not personally, but ISTR that there is a site for the UK that lists them. It
relies on users reporting fixed speed traps and commonly used locations for
mobile ones.

Here's a small example... http://www.speedcam.pwp.blueyonder.co.uk/index2.htm

Check out the explosives used on some Gatsos here...
http://www.speedcam.pwp.blueyonder.co.uk/index2.htm


Graham

 

[Ken Taylor]

"Jim Thompson" <thegreatone@example.com> wrote in message
news:s71061p39gf22f90kjqu1tgju1snahv7nb@4ax.com...

On Fri, 15 Apr 2005 10:37:02 -0700, Bob Stephens <roberts@dcxchol.com
wrote:

On Fri, 15 Apr 2005 17:21:13 GMT, Richard the Dreaded Libertarian wrote:

On Thu, 14 Apr 2005 22:23:32 -0700, Jim Thompson wrote:

I got an "energy ticket"... back in the Carter double-nickel days ;-)

Let's not blame Jimmy for what was actually an Imperial Edict from your
fair-haired proto-neocon, Richard M. Nixon, AKA Trickee Dickee.

Thanks,
Rich

I thought the '55 saves lives' campaign was bogus, but I still kind of
like
the idea - if you must arbitrarily set the limit at 55 - of anything
between 55 and 75 being an energy offence as opposed to an insurance
hiking
moving violation and crime against humanity. Sort of like the pay to
pollute gambit for industry.


Bob

I ran across an article just a few days ago debunking '55 saves
lives', I'll see if I can locate it again.

We (in Arizona) are about to raise all freeway speed limits to 75,
which is the "granny" speed around here.

I understand they've been nailing people right and left doing 110+ on
Loop 101 ;-)

...Jim Thompson
--
I drove from Green Bay to Milwaukee on whatever highway that is just before

Christmas - not only do you guys drive on the wrong side of the road (I can
live with that), and not only at 80mph (that's cool....), but there was SNOW
on the road too! Who the hell has snow on a road?? Distinctly
uncivilised......

Cheers.

Ken

 

[Jim Yanik]

"Andy" <andysharpe@juno.com> wrote in
news:1113598761.215699.286490@o13g2000cwo.googlegroups.com:

Come to think of it, can anyone suggest where I can get a schematic of
a LASAR gun so I can
see how it works ?

Andy (retired from Texas Instruments)

Laser speed guns work by making multiple distance/time measurements,using
pulse widths of ~35ns,rep rates of ~500 hz.They fire a pulse,and clock the
return to measure distance.Then calculate the distance change over time.

I got that a long time ago from an industry laser magazine;Laser World or
something like that.

--
Jim Yanik
jyanik
at
kua.net

 

[budgie]

On Thu, 14 Apr 2005 08:25:13 -0700, Jim Thompson <thegreatone@example.com>
wrote:

On Thu, 14 Apr 2005 11:01:36 -0400, Keith Williams <krw@att.bizzzz
wrote:

In article <425E1625.D443DDA1@hotmail.com>,
rabbitsfriendsandrelations@hotmail.com says...
[snip]

It's a great way of earning extra revenue for the authorities though.

Bingo! Vermont passed a law so virtually all "revenue" goes to the
state. The result is that localities aren't so interested in radar
traps. ;-)

Politicians worship the god of revenue. Take that away and there's no
interest.

I like the concept of all revenue going to the state. I think I'll
prime some legislators with the idea ;-)

That is the *problem* here in Australia - the state is the body operating the
devices :-(

 

[Keith Williams]

In article <g4Y7e.19123$1S4.1904552@news.xtra.co.nz>, ken@home.nz
says...

"Jim Thompson" <thegreatone@example.com> wrote in message
news:s71061p39gf22f90kjqu1tgju1snahv7nb@4ax.com...
On Fri, 15 Apr 2005 10:37:02 -0700, Bob Stephens <roberts@dcxchol.com
wrote:

On Fri, 15 Apr 2005 17:21:13 GMT, Richard the Dreaded Libertarian wrote:

On Thu, 14 Apr 2005 22:23:32 -0700, Jim Thompson wrote:

I got an "energy ticket"... back in the Carter double-nickel days ;-)

Let's not blame Jimmy for what was actually an Imperial Edict from your
fair-haired proto-neocon, Richard M. Nixon, AKA Trickee Dickee.

Thanks,
Rich

I thought the '55 saves lives' campaign was bogus, but I still kind of
like
the idea - if you must arbitrarily set the limit at 55 - of anything
between 55 and 75 being an energy offence as opposed to an insurance
hiking
moving violation and crime against humanity. Sort of like the pay to
pollute gambit for industry.


Bob

I ran across an article just a few days ago debunking '55 saves
lives', I'll see if I can locate it again.

We (in Arizona) are about to raise all freeway speed limits to 75,
which is the "granny" speed around here.

I understand they've been nailing people right and left doing 110+ on
Loop 101 ;-)

...Jim Thompson
--
I drove from Green Bay to Milwaukee on whatever highway that is just before
Christmas - not only do you guys drive on the wrong side of the road (I can
live with that), and not only at 80mph (that's cool....), but there was SNOW
on the road too! Who the hell has snow on a road?? Distinctly
uncivilised......

Bah! Snow is easy to drive on. Ice, OTOH...

I tell my wife that I have a 4WD truck, so I can go anywhere. It even
has the off-road package so I can go off the road.

--
Keith

 

[Ken Taylor]

"Keith Williams" <krw@att.bizzzz> wrote in message
news:MPG.1cca5269465d8a739899db@news.individual.net...

In article <g4Y7e.19123$1S4.1904552@news.xtra.co.nz>, ken@home.nz
says...
"Jim Thompson" <thegreatone@example.com> wrote in message
news:s71061p39gf22f90kjqu1tgju1snahv7nb@4ax.com...
On Fri, 15 Apr 2005 10:37:02 -0700, Bob Stephens <roberts@dcxchol.com
wrote:

On Fri, 15 Apr 2005 17:21:13 GMT, Richard the Dreaded Libertarian
wrote:

On Thu, 14 Apr 2005 22:23:32 -0700, Jim Thompson wrote:

I got an "energy ticket"... back in the Carter double-nickel days
;-)

Let's not blame Jimmy for what was actually an Imperial Edict from
your
fair-haired proto-neocon, Richard M. Nixon, AKA Trickee Dickee.

Thanks,
Rich

I thought the '55 saves lives' campaign was bogus, but I still kind
of
like
the idea - if you must arbitrarily set the limit at 55 - of anything
between 55 and 75 being an energy offence as opposed to an insurance
hiking
moving violation and crime against humanity. Sort of like the pay to
pollute gambit for industry.


Bob

I ran across an article just a few days ago debunking '55 saves
lives', I'll see if I can locate it again.

We (in Arizona) are about to raise all freeway speed limits to 75,
which is the "granny" speed around here.

I understand they've been nailing people right and left doing 110+ on
Loop 101 ;-)

...Jim Thompson
--
I drove from Green Bay to Milwaukee on whatever highway that is just
before
Christmas - not only do you guys drive on the wrong side of the road (I
can
live with that), and not only at 80mph (that's cool....), but there was
SNOW
on the road too! Who the hell has snow on a road?? Distinctly
uncivilised......

Bah! Snow is easy to drive on. Ice, OTOH...

I tell my wife that I have a 4WD truck, so I can go anywhere. It even
has the off-road package so I can go off the road.

--
Keith

That's odd, people weren't using trucks off the road when I went by....

Ken

 

[Barry Lennox]

On 16 Apr 2005 00:05:09 GMT, Jim Yanik <jyanik@abuse.gov.> wrote:

"Andy" <andysharpe@juno.com> wrote in
news:1113598761.215699.286490@o13g2000cwo.googlegroups.com:




Come to think of it, can anyone suggest where I can get a schematic of
a LASAR gun so I can
see how it works ?

Andy (retired from Texas Instruments)


Laser speed guns work by making multiple distance/time measurements,using
pulse widths of ~35ns,rep rates of ~500 hz.They fire a pulse,and clock the
return to measure distance.Then calculate the distance change over time.

I got that a long time ago from an industry laser magazine;Laser World or
something like that.

Any idea what they use as the "Laser diode"? wavelength, power?
Could a simple laser diode modulated with ~35 nS pulses at around
~500Hz stuff it up? I have read somewhere that the later guns have a
"jammer detector" built in the brings on a "Jamming" LED for the cop.

Barry Lennox

 

[Pooh Bear]

Jim Thompson wrote:

I got an "energy ticket"... back in the Carter double-nickel days ;-)

What was an 'energy ticket' exactly ? Preumably intended to reduce gasoline use.
During the 70s 'oil crisis' we had an overall 50 mph speed limit imposed here. I
still have the fuel ration tokens that were distributed in case they might need to
introduce rationing.

Graham

 

[TCS]

On Fri, 15 Apr 2005 23:37:07 -0400, Keith Williams <krw@att.bizzzz> wrote:

Bah! Snow is easy to drive on. Ice, OTOH...

I tell my wife that I have a 4WD truck, so I can go anywhere. It even
has the off-road package so I can go off the road.

If only it had the on-road package so you wouldn't need to call a tow
truck.

Here in colorado, it's become a cliche: 19 out of 20 cars that go sailing
off road when it snows are 4wd. These idiots think that 4wd will hold the
road better instead of just gettng them out of control faster.

 

[Fred Abse]

On Thu, 14 Apr 2005 21:44:01 -0700, Jim Thompson wrote:

I've found, through experiment, that sufficiently rapid deceleration
renders the police radar non-reading ;-)

But the g makes you black out and then you hit the policeman

--
"Electricity is of two kinds, positive and negative. The difference
is, I presume, that one comes a little more expensive, but is more
durable; the other is a cheaper thing, but the moths get into it."
(Stephen Leacock)

 

[John Woodgate]

I read in sci.electronics.design that Andy <andysharpe@juno.com> wrote
(in <1113669576.303676.190600@f14g2000cwb.googlegroups.com&gt about
'TIRIS', on Sat, 16 Apr 2005:

It reinforced my feelings that , no matter how smart the team is, or
how much preparation they do, you don't know diddly squat about how a
system works in the field till you try it out.......

This is a fundamental law of nature.
--
Regards, John Woodgate, OOO - Own Opinions Only.
There are two sides to every question, except
'What is a Moebius strip?'
http://www.jmwa.demon.co.uk Also see http://www.isce.org.uk

 

[Jim Yanik]

Barry Lennox <rianz.15.barryl@neverbox.com> wrote in
news:m6g161dnuu50njc9fo428ne6k62knjr31s@4ax.com:

On 16 Apr 2005 00:05:09 GMT, Jim Yanik <jyanik@abuse.gov.> wrote:

"Andy" <andysharpe@juno.com> wrote in
news:1113598761.215699.286490@o13g2000cwo.googlegroups.com:




Come to think of it, can anyone suggest where I can get a schematic
of a LASAR gun so I can
see how it works ?

Andy (retired from Texas Instruments)


Laser speed guns work by making multiple distance/time
measurements,using pulse widths of ~35ns,rep rates of ~500 hz.They
fire a pulse,and clock the return to measure distance.Then calculate
the distance change over time.

I got that a long time ago from an industry laser magazine;Laser World
or something like that.

Any idea what they use as the "Laser diode"? wavelength, power?
Could a simple laser diode modulated with ~35 nS pulses at around
~500Hz stuff it up? I have read somewhere that the later guns have a
"jammer detector" built in the brings on a "Jamming" LED for the cop.

Barry Lennox

Specs I've read were 904nm.power,I dunno.The reflected power they get from
their pulses will not be that great,either.
I suspect a long pulse train would jam the laser guns,but again,I don't
know about jam indications.You would wear out the LD if it was on
continuously.It would need to be triggered by reception of a laser pulse.
(like the Lidatek jammer)

I know that some states have laws that make using laser jammers
"interfering with police enforcement activities" or something similar.

--
Jim Yanik
jyanik
at
kua.net

 

[Jim Yanik]

"Andy" <andysharpe@juno.com> wrote in
news:1113669980.202450.75090@g14g2000cwa.googlegroups.com:

Jim Yanik wrote:
"Andy" <andysharpe@juno.com> wrote in
news:1113598761.215699.286490@o13g2000cwo.googlegroups.com:




Come to think of it, can anyone suggest where I can get a schematic
of
a LASAR gun so I can
see how it works ?

Andy (retired from Texas Instruments)


Laser speed guns work by making multiple distance/time
measurements,using
pulse widths of ~35ns,rep rates of ~500 hz.They fire a pulse,and
clock the
return to measure distance.Then calculate the distance change over
time.

I got that a long time ago from an industry laser magazine;Laser
World or
something like that.

--
Jim Yanik
jyanik
at
kua.net


Andy replies:

Well then, I doubt that my blue sky idea would work for LASARs
then...
Oh well.

I suspect that the beam is wide enough when it meets the car to
illuminate the whole front, so they will get enough return from
somewhere or other.....

Actually beam width is around 18 inches. Too big a spot,and your
measurement area may unknowingly strike more than one car,thus raising
doubt of which car was actually measured.



--
Jim Yanik
jyanik
at
kua.net

 

[keith]

On Sat, 16 Apr 2005 09:53:31 +0800, budgie wrote:

On Thu, 14 Apr 2005 08:25:13 -0700, Jim Thompson <thegreatone@example.com
wrote:

On Thu, 14 Apr 2005 11:01:36 -0400, Keith Williams <krw@att.bizzzz
wrote:

In article <425E1625.D443DDA1@hotmail.com>,
rabbitsfriendsandrelations@hotmail.com says...
[snip]

It's a great way of earning extra revenue for the authorities though.

Bingo! Vermont passed a law so virtually all "revenue" goes to the
state. The result is that localities aren't so interested in radar
traps. ;-)

Politicians worship the god of revenue. Take that away and there's no
interest.

I like the concept of all revenue going to the state. I think I'll
prime some legislators with the idea ;-)

That is the *problem* here in Australia - the state is the body operating the
devices :-(

The real problem here (US) is that the municipalities like to enhance
revenue with speed traps that might not be entirely cricket. The local
cops have a much higher tendancy to be rambo-wannabes than do the state
police, who *tend* to be very professional. Taking the financial
incentive away from every two-bit tin-horn cop and mayor and moving it to
the state tends to make the system more fair. If I'm nailed for speeding
fine, but many local speed traps are just that; entrapment.

--
Keith

 

[keith]

On Sat, 16 Apr 2005 17:30:19 +1200, Ken Taylor wrote:

"Keith Williams" <krw@att.bizzzz> wrote in message
news:MPG.1cca5269465d8a739899db@news.individual.net...
In article <g4Y7e.19123$1S4.1904552@news.xtra.co.nz>, ken@home.nz
says...
"Jim Thompson" <thegreatone@example.com> wrote in message
news:s71061p39gf22f90kjqu1tgju1snahv7nb@4ax.com...
On Fri, 15 Apr 2005 10:37:02 -0700, Bob Stephens <roberts@dcxchol.com
wrote:

On Fri, 15 Apr 2005 17:21:13 GMT, Richard the Dreaded Libertarian
wrote:

On Thu, 14 Apr 2005 22:23:32 -0700, Jim Thompson wrote:

I got an "energy ticket"... back in the Carter double-nickel days
;-)

Let's not blame Jimmy for what was actually an Imperial Edict from
your
fair-haired proto-neocon, Richard M. Nixon, AKA Trickee Dickee.

Thanks,
Rich

I thought the '55 saves lives' campaign was bogus, but I still kind
of
like
the idea - if you must arbitrarily set the limit at 55 - of anything
between 55 and 75 being an energy offence as opposed to an insurance
hiking
moving violation and crime against humanity. Sort of like the pay to
pollute gambit for industry.


Bob

I ran across an article just a few days ago debunking '55 saves
lives', I'll see if I can locate it again.

We (in Arizona) are about to raise all freeway speed limits to 75,
which is the "granny" speed around here.

I understand they've been nailing people right and left doing 110+ on
Loop 101 ;-)

...Jim Thompson
--
I drove from Green Bay to Milwaukee on whatever highway that is just
before
Christmas - not only do you guys drive on the wrong side of the road (I
can
live with that), and not only at 80mph (that's cool....), but there was
SNOW
on the road too! Who the hell has snow on a road?? Distinctly
uncivilised......

Bah! Snow is easy to drive on. Ice, OTOH...

I tell my wife that I have a 4WD truck, so I can go anywhere. It even
has the off-road package so I can go off the road.

--
Keith

That's odd, people weren't using trucks off the road when I went by....

I didn't say I could *use* it off the road.

--
Keith

 

[keith]

On Sat, 16 Apr 2005 11:24:57 -0500, TCS wrote:

On Fri, 15 Apr 2005 23:37:07 -0400, Keith Williams <krw@att.bizzzz> wrote:
Bah! Snow is easy to drive on. Ice, OTOH...

I tell my wife that I have a 4WD truck, so I can go anywhere. It even
has the off-road package so I can go off the road.

If only it had the on-road package so you wouldn't need to call a tow
truck.

Never have had to, in any vehicle (other than ones that had traded much
paint with other vehicles - none weather related).

Here in colorado, it's become a cliche: 19 out of 20 cars that go
sailing off road when it snows are 4wd. These idiots think that 4wd
will hold the road better instead of just gettng them out of control
faster.

My 4WD peekup holds on ice/snow much better in 4WD than 2WD, even
brakeing. The back's just too light to keep it back there in 2WD.
Of course, I see many driving like it's a fine spring day, then "ah Sh...".

--
Keith

 

[TCS]

On Sun, 17 Apr 2005 14:23:45 -0400, keith <krw@att.bizzzz> wrote:

My 4WD peekup holds on ice/snow much better in 4WD than 2WD, even
brakeing. The back's just too light to keep it back there in 2WD.
Of course, I see many driving like it's a fine spring day, then "ah Sh...".

OK. You're joking.

 

[Frithiof Andreas Jensen]

"tlbs" <tlbs101@excite.com> wrote in message
news:1113403431.378388.205160@g14g2000cwa.googlegroups.com...

3. Actually there is a 3rd category -- those fitting categories 1, or
especially 2, who are stupid enough to tell about it.

You forgot the FOURTH Category: People who advertize and sell "Radar
Jammers" which are perfectly legal because they do not do anything except
flash a collection of LED'S ...

 

[budgie]

On Sun, 17 Apr 2005 14:15:55 -0400, keith <krw@att.bizzzz> wrote:

On Sat, 16 Apr 2005 09:53:31 +0800, budgie wrote:

On Thu, 14 Apr 2005 08:25:13 -0700, Jim Thompson <thegreatone@example.com
wrote:

On Thu, 14 Apr 2005 11:01:36 -0400, Keith Williams <krw@att.bizzzz
wrote:

In article <425E1625.D443DDA1@hotmail.com>,
rabbitsfriendsandrelations@hotmail.com says...
[snip]

It's a great way of earning extra revenue for the authorities though.

Bingo! Vermont passed a law so virtually all "revenue" goes to the
state. The result is that localities aren't so interested in radar
traps. ;-)

Politicians worship the god of revenue. Take that away and there's no
interest.

I like the concept of all revenue going to the state. I think I'll
prime some legislators with the idea ;-)

That is the *problem* here in Australia - the state is the body operating the
devices :-(

The real problem here (US) is that the municipalities like to enhance
revenue with speed traps that might not be entirely cricket. The local
cops have a much higher tendancy to be rambo-wannabes than do the state
police, who *tend* to be very professional. Taking the financial
incentive away from every two-bit tin-horn cop and mayor and moving it to
the state tends to make the system more fair. If I'm nailed for speeding
fine, but many local speed traps are just that; entrapment.

I fully appreciate your situation. The thing is that here in Oz there are ONLY
state police forces unlike your Merkin model. (I mean yes we have a federal
polforce but their jurisdiction is only federal legislation)

So we get uniformity. Not that uniformity equates to perfection.

(And here in WestOz the kerbside cash registers are operated by civvies employed
by the state police service.)