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

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.


Regards,


Jim





Yep they are available. I have about a dozen or so of Gunn units that
came from
10 GHz door opening bits They have the Gunn diode and a detector diode.
The rest of the
electronics I threw away.

Two of them can be sent for the cost of postage.

Bill K7NOM

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.

I realize this is way off the subject, and I do honestly wish you
success in getting the neighborhood speed demons under control, but...

as a bicyclist, I find it necessary to point out... that if the
neighborhood dogs are being hit by speeders, those dogs are obviously in
the road. They shouldn't be.
--
Doug Smith W9WI
Pleasant View (Nashville), TN EM66
http://www.w9wi.com

Neither should little kids, but poo happens. With dogs it's "I'm sorry".
With kids it's manslaughter.

Jim



"Doug Smith W9WI" wrote in message
...

as a bicyclist, I find it necessary to point out... that if the
neighborhood dogs are being hit by speeders, those dogs are obviously in
the road. They shouldn't be.
--
Doug Smith W9WI
Pleasant View (Nashville), TN EM66
http://www.w9wi.com

On Sat, 7 Jan 2006 11:28:12 -0800, "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.


Regards,


Jim



IIRC I've seen police radar guns as surplus.

It's been quite a few years ago now, so I don't recall the details,
but I bought a "sports gun" for my youngest that he used at dragster
events. I think it was about $100.

...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 Sat, 7 Jan 2006 11:28:12 -0800, "RST Engineering"
wrote:

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.

Ramsey makes a kit. You can find the info he

http://www.youdoitelectronics.com/id..._radar_kit.htm

Danny, K6MHE



email: k6mheatarrldotnet
http://www.k6mhe.com/

Do a looksie on E-Pay, cheap old style X and K band units are available.
With a 12vDC power supply, you can have your very own source. Even if you
just buy the head without the counter, the 12vdc will supply the head and it
will put out.

Do NOT purchase the Ramsey "kit" for this applicaiton. While it may be fun
for a budding electronics wanna-be, it does not put out at a frequency that
will trigger radar detectors.

Jack

On Sat, 7 Jan 2006 11:28:12 -0800, "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.



Jim, take a look at www.shfmicro.com where you'll find 10GHz and
24GHz doppler modules for sale at very favourable prices. They would
certainly be very useful for what you have in mind.

Good luck..

Peter, G3PHO

UK Microwave Group

www.microwavers.org
www.g3pho.org.uk

Hello Jim,


Neither should little kids, but poo happens. With dogs it's "I'm sorry". ...


Not necessarily. It can become wrongful death but you'd have to have
proof of grossly excessive speed. Skidmarks can be such proof if a car
doesn't have ALB. But, of course, the experts for that usually only come
out when a person has been hit.

Regards, Joerg

http://www.analogconsultants.com

Why would I care if it triggered a radar detector? In fact, it would be
BETTER if it didn't trigger a detector.

Jim


"Rather Play Pinball" wrote in message
...

Do NOT purchase the Ramsey "kit" for this applicaiton. While it may be
fun for a budding electronics wanna-be, it does not put out at a frequency
that will trigger radar detectors.

Jack