I don't know where this thread went, but... Perhaps I missed it, but try
searching on Gunplexer.

That should get you to the ham sites where such things are talked about and
sources named. Hams use them on 10 GHz and it would be a simple matter to
detect the Doppler freq and do some sort of frequency detect.

Oh hell. here's some of my links:
http://www.g3pho.free-online.co.uk/m...s/wideband.htm
http://www.kwarc.org/10ghz/10GHZ-4.htm


73, Steve, K,9.D;C'I


"RST Engineering" wrote in message
...
Back in the '60s and early '70s I did some work with Impatt and Gunn
diodes,
building a little self-detecting doppler for speed sensing. However, 35
years have passed and my notebooks for that stuff are somewhere in a dusty
archive along with my venerable sliderule.

Is there a cheap source for onesies-twosies of a radar front-end that will
give me doppler audio as a function of a large metal object's speed at a
range of 20 meters or so? I don't need to go into production on this
thing,
just build one. A surplus source would be ideal.

It seems that the little kids on our rural country lane have all become
teenagers at once and are trying to outdo the others in how fast they can
drive daddy's car up and down the lane. We've lost one dog this week and
unless I can put up some sort of a siren that goes off when they exceed
some
agreed upon limit, the carnage will continue.


Regards,


Jim

On Mon, 9 Jan 2006 17:00:44 -0600, "Steve Nosko"
wrote:

I don't know where this thread went, but... Perhaps I missed it, but try
searching on Gunplexer.

It went the way of all neighborly, over the backyard fence
discussions.

This is usenet, remember. Totally typical and often informative (and
often not) [g].

RST Engineering wrote:

Back in the '60s and early '70s I did some work with Impatt and Gunn diodes,
building a little self-detecting doppler for speed sensing. However, 35
years have passed and my notebooks for that stuff are somewhere in a dusty
archive along with my venerable sliderule.

Is there a cheap source for onesies-twosies of a radar front-end that will
give me doppler audio as a function of a large metal object's speed at a
range of 20 meters or so? I don't need to go into production on this thing,
just build one. A surplus source would be ideal.

It seems that the little kids on our rural country lane have all become
teenagers at once and are trying to outdo the others in how fast they can
drive daddy's car up and down the lane. We've lost one dog this week and
unless I can put up some sort of a siren that goes off when they exceed some
agreed upon limit, the carnage will continue.

A strobe light. The radar 'your speed is..' signs don't do much to
discourage the a*holes. They just try to see what sort of quarter mile
speed they can hit.

The ones with the strobe make them wonder whether they'll be getting one
of those photo tickets in the mail.

--
Paul Hovnanian
------------------------------------------------------------------
When cryptography is outlawed, bayl bhgynjf jvyy unir cevinpl.
-- Etaoin Shrdlu

On Mon, 09 Jan 2006 18:07:47 -0800, "Paul Hovnanian P.E."
wrote:

RST Engineering wrote:

Back in the '60s and early '70s I did some work with Impatt and Gunn diodes,
building a little self-detecting doppler for speed sensing. However, 35
years have passed and my notebooks for that stuff are somewhere in a dusty
archive along with my venerable sliderule.

Is there a cheap source for onesies-twosies of a radar front-end that will
give me doppler audio as a function of a large metal object's speed at a
range of 20 meters or so? I don't need to go into production on this thing,
just build one. A surplus source would be ideal.

It seems that the little kids on our rural country lane have all become
teenagers at once and are trying to outdo the others in how fast they can
drive daddy's car up and down the lane. We've lost one dog this week and
unless I can put up some sort of a siren that goes off when they exceed some
agreed upon limit, the carnage will continue.

A strobe light. The radar 'your speed is..' signs don't do much to
discourage the a*holes. They just try to see what sort of quarter mile
speed they can hit.

The ones with the strobe make them wonder whether they'll be getting one
of those photo tickets in the mail.

How about a sign that says, "Shotgun automatically triggered when
speed exceeds 25MPH" ?:-)

...Jim Thompson
--
| James E.Thompson, P.E. | mens |
| Analog Innovations, Inc. | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| Phoenix, Arizona Voice480)460-2350 | |
| E-mail Address at Website Fax480)460-2142 | Brass Rat |
| http://www.analog-innovations.com | 1962 |

I love to cook with wine. Sometimes I even put it in the food.

On Mon, 09 Jan 2006 19:23:32 -0700, Jim Thompson wrote:
On Mon, 09 Jan 2006 18:07:47 -0800, "Paul Hovnanian P.E."
RST Engineering wrote:
....
It seems that the little kids on our rural country lane have all become
teenagers at once and are trying to outdo the others in how fast they can
drive daddy's car up and down the lane. We've lost one dog this week and
unless I can put up some sort of a siren that goes off when they exceed some
agreed upon limit, the carnage will continue.

A strobe light. The radar 'your speed is..' signs don't do much to
discourage the a*holes. They just try to see what sort of quarter mile
speed they can hit.

The ones with the strobe make them wonder whether they'll be getting one
of those photo tickets in the mail.

How about a sign that says, "Shotgun automatically triggered when
speed exceeds 25MPH" ?:-)

...Jim Thompson

Leave it to Thompson to come up with one that involves lethal violence.
At least the booby-trap I suggested only involves noise and damage to
the car's paint ( and maybe sheet metal, depending how fast they're going
and what's in the garbage cans. )

Cheers!
Rich

Jim Thompson wrote:

How about a sign that says, "Shotgun automatically triggered when
speed exceeds 25MPH" ?:-)

Jim Thompson


This from someone who brags about speeding? I say go for it,
anywhere you normally drive. If it works out ok on you, they can try it
in other cities.

--
Service to my country? Been there, Done that, and I've got my DD214 to
prove it.
Member of DAV #85.

Michael A. Terrell
Central Florida