Radar detector/scrambler

  • Thread starter captainvideo462002@yahoo.
  • Start date
On Feb 18, 6:38 am, "Michael A. Terrell" <mike.terr...@earthlink.net>
wrote:
Jim Yanik wrote:

Jeff Liebermann <je...@cruzio.com> wrote in
news:e8dpl61rq9e2phhlustatkkuhlmtu5eku8@4ax.com:

Ramsey Radar Gun:
http://www.ramseyelectronics.com/cgi-bin/commerce.exe?preadd=action&key
=SG7

I used to go to high school with John Ramsey;
he used to make little "wireless microphones".

   Did you ever see one of his 'Service Monitors' he sold to the pager
repair business?

--
You can't fix stupid. You can't even put a band-aid on it, because it's
Teflon coated.
Click to expand...
It would seem to me though that if you were to simply generate even a
dead carrier on the radar frequency sufficient in strength to swamp
that of the returned signal back to the origination point wouldn't
that do the job? I don't mean to say that it would be healthy or smart
for that matter to drive around all the time while transmitting 10.0
GHZ or whatever but how complicated does this have to be? The PRC 25
and 77 had a "retransmit" function. We never really used it but I was
under the impression that it would retransmit the signal it received
perhaps to a repeater for distant communication. So if the military
had this in 1968 it must be easy to implement now. Lenny
 
klem kedidelhopper wrote:
On Feb 18, 6:38 am, "Michael A. Terrell" <mike.terr...@earthlink.net
wrote:
Jim Yanik wrote:

Jeff Liebermann <je...@cruzio.com> wrote in
news:e8dpl61rq9e2phhlustatkkuhlmtu5eku8@4ax.com:

Ramsey Radar Gun:
http://www.ramseyelectronics.com/cgi-bin/commerce.exe?preadd=action&key
=SG7

I used to go to high school with John Ramsey;
he used to make little "wireless microphones".

Did you ever see one of his 'Service Monitors' he sold to the pager
repair business?

It would seem to me though that if you were to simply generate even a
dead carrier on the radar frequency sufficient in strength to swamp
that of the returned signal back to the origination point wouldn't
that do the job? I don't mean to say that it would be healthy or smart
for that matter to drive around all the time while transmitting 10.0
GHZ or whatever but how complicated does this have to be? The PRC 25
and 77 had a "retransmit" function. We never really used it but I was
under the impression that it would retransmit the signal it received
perhaps to a repeater for distant communication. So if the military
had this in 1968 it must be easy to implement now. Lenny
Click to expand...

It isn't that simple. Police RADAR works by Doppler effect. I.E.,
the returned signal is mixed with with a sample of the transmitted
frequency. The difference in frequency tells your speed. Any attempt
to jam it will be a crap shoot. Even if you managed to match the RADAR
transmitter's frequency, it would still show your speed.

Military RADAR is RAdio Detection And Ranging, or a means to bounce a
signal off metallic objects, and time the reflection to measure the
distance. The rotating antenna gives you the heading. Some also change
the vertical angle to give the elevation of a target. I've serviced
both types.


--
You can't fix stupid. You can't even put a band-aid on it, because it's
Teflon coated.
 
On Sat, 19 Feb 2011 18:34:47 -0500, "Michael A. Terrell"
<mike.terrell@earthlink.net> wrote:


It isn't that simple. Police RADAR works by Doppler effect. I.E.,
the returned signal is mixed with with a sample of the transmitted
frequency. The difference in frequency tells your speed. Any attempt
to jam it will be a crap shoot. Even if you managed to match the RADAR
transmitter's frequency, it would still show your speed.
Click to expand...
You know the frequency of the signal you receive. You know your speed.
Assuming you could build a circuit to compute the necessary bits, you
should have little trouble computing the original transmitted
frequency with those two bits of information. The simply transmitting
the same frequency back should result in the desired result of a lower
reading.
 
PeterD <peter2@hipson.net> wrote in
news:5kl0m65ivs5mur7bntkd0tmnlse8vqur1o@4ax.com:

On Sat, 19 Feb 2011 18:34:47 -0500, "Michael A. Terrell"
mike.terrell@earthlink.net> wrote:



It isn't that simple. Police RADAR works by Doppler effect. I.E.,
the returned signal is mixed with with a sample of the transmitted
frequency. The difference in frequency tells your speed. Any attempt
to jam it will be a crap shoot. Even if you managed to match the RADAR
transmitter's frequency, it would still show your speed.


You know the frequency of the signal you receive. You know your speed.
Assuming you could build a circuit to compute the necessary bits, you
should have little trouble computing the original transmitted
frequency with those two bits of information. The simply transmitting
the same frequency back should result in the desired result of a lower
reading.
Click to expand...
the active jammers I've seen program a set freq. shift to give a lesser
speed reading at the radargun. they had a switch to change it for different
speed zones.The jammer's stronger direct signal overwhelms the weaker
reflection of the gun's signal.

But white noise is broadband,so a radargun would not be able to make any
comparison to the transmitted freq. with a "white noise jammer" It would
raise the noise floor ABOVE the reflected signal,smothering it.
I believe I've seen references to radarguns having an indicator for
"jamming",and their audio output would also be an indicator,operators being
trained to recognize interference.

--
Jim Yanik
jyanik
at
localnet
dot com
 
PeterD wrote:
On Sat, 19 Feb 2011 18:34:47 -0500, "Michael A. Terrell"
mike.terrell@earthlink.net> wrote:


It isn't that simple. Police RADAR works by Doppler effect. I.E.,
the returned signal is mixed with with a sample of the transmitted
frequency. The difference in frequency tells your speed. Any attempt
to jam it will be a crap shoot. Even if you managed to match the RADAR
transmitter's frequency, it would still show your speed.


You know the frequency of the signal you receive. You know your speed.
Assuming you could build a circuit to compute the necessary bits, you
should have little trouble computing the original transmitted
frequency with those two bits of information. The simply transmitting
the same frequency back should result in the desired result of a lower
reading.
Click to expand...

Do you know the angle the RADAR transmitter is coming from? Also, if
the display is obviously wrong, the cop will know you are using ECM to
avoid a ticket.


--
You can't fix stupid. You can't even put a band-aid on it, because it's
Teflon coated.
 
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