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

Bill Janssen 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.


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
I suggest modifying a readily available sports radar, it is very sensitive,
outputs speed digitally and is inexpensive.
--
JosephKK