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RST Engineering January 7th 06 07:28 PM

Doppler Radar
 
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




Bill Janssen January 7th 06 07:41 PM

Doppler Radar
 
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

Doug Smith W9WI January 7th 06 07:43 PM

Doppler Radar
 
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


RST Engineering January 7th 06 07:47 PM

Doppler Radar
 
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




Jim Thompson January 7th 06 08:01 PM

Doppler Radar
 
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 Voice:(480)460-2350 | |
| E-mail Address at Website Fax:(480)460-2142 | Brass Rat |
| http://www.analog-innovations.com | 1962 |

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

Dan Richardson January 7th 06 08:12 PM

Doppler Radar
 
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/

Rather Play Pinball January 7th 06 09:06 PM

Doppler Radar
 

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





Peter January 7th 06 09:18 PM

Doppler Radar
 
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

Joerg January 7th 06 09:43 PM

Doppler Radar
 
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

RST Engineering \(jw\) January 7th 06 10:15 PM

Doppler Radar
 
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







RST Engineering \(jw\) January 7th 06 10:19 PM

Doppler Radar
 
Peter, thanks, but they are a bit pricey for what I have in mind.

Jim


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






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.




Wes Stewart January 7th 06 10:24 PM

Doppler Radar
 
On Sat, 7 Jan 2006 16:06:31 -0500, "Rather Play Pinball"
wrote:


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.


He's not trying to set off detectors, he's trying to set a speed
threshold where a siren goes off.

But what the heck, if you're going to set up an illegal transmitter,
might as well use one big enough to reset the ECM in their cars.

RST Engineering January 7th 06 10:47 PM

Doppler Radar
 
What illegal? I can either retune it for a ham band or reduce power if
necessary. I'll find the hardware first and figure out the legal later.

Jim


"Wes Stewart" wrote in message



But what the heck, if you're going to set up an illegal transmitter,
might as well use one big enough to reset the ECM in their cars.




maxfoo January 7th 06 11:08 PM

Doppler Radar
 
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


Go to your local police department and have them monitor the speeders with a
automated speed display unit. What! they don't have one in your town? bring it
up at the next town meeting... ;)





Ken Taylor January 7th 06 11:13 PM

Doppler Radar
 

"RST Engineering (jw)" wrote in message
...
Why would I care if it triggered a radar detector? In fact, it would be
BETTER if it didn't trigger a detector.

Jim


Why? Don't you intend to trigger a siren to slow them down? What's it matter
if they slow down because of their dectors - they slow down, and that would
appear to be the important thing.

Cheers.

Ken


"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









Ken Taylor January 7th 06 11:16 PM

Doppler Radar
 
There's a radar speed gun on Ebay *NOW* (not mine, so technically this isn't
spam...:-)

Cheers.

Ken

"RST Engineering (jw)" wrote in message
...
Peter, thanks, but they are a bit pricey for what I have in mind.

Jim


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






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.






Brian January 7th 06 11:55 PM

Doppler Radar
 

"RST Engineering" wrote in message
...

What a waste of time! If you have a problem with speeding cars just phone
the police, or video record it and phone them at a later date. Also don't
be irresponsible and let dogs out as they might cause an accident or get
killed if they run across roads infront of cars.



Brian January 8th 06 12:00 AM

Doppler Radar
 

"RST Engineering" wrote in message
...
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



RESPONSIBLE parents do not let their children run out in the road, idiots
that allow dogs to run free in the road need to be aware that they can cause
accidents. I do hope the pathetic owner is held responsible when a dog
which is out of control runs out and causes an accident.
Two seperate arguments, you need to be clear of what it is you want.
Jealousy is a terrible thing, so if that's all it's down to then give up.
That is wht it comes across as. The people concerned probably have their
own cars and don't expect some idiot to allow a dog to run infront of them
in the hope they will hit it. Were you after an insurance claim?
Keep the dogs under control as responsible people keep their children under
control.




Brian January 8th 06 12:01 AM

Doppler Radar
 

"Joerg" wrote in message
. net...
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

No idea what you mean by ALB as abbreviations are only good for those who
all have an understanding of what is meant.
If you refer to a car with antilock brakes then they DO leave marks that can
be identified. I have investigated enough accident scenes that leave the
same tell tale signs. Boy racers with antilock brakes all assume they can
go faster and no one will know. How wrong they are.



RST Engineering January 8th 06 12:05 AM

Doppler Radar
 
A) We aren't in a "town", rather we are pretty far out into the country.

B) It is a private dead-end road owned in mutual easement between the four
families that live at the end of it about half a mile off the county road
that serves it. The county mounties have nothing to say about what goes on
on the road.

C) I realize that this is newsnet and anything goes, but why can't you just
ATFQ?

Jim


Go to your local police department and have them monitor the speeders with
a
automated speed display unit. What! they don't have one in your town?
bring it
up at the next town meeting... ;)




Joerg January 8th 06 12:22 AM

Doppler Radar
 
Hallo Brian,


No idea what you mean by ALB as abbreviations are only good for those who
all have an understanding of what is meant.



I used ALB because it was on the insurance papers. They give a discount
for that feature. In Europe they mostly call it ABS.


If you refer to a car with antilock brakes then they DO leave marks that can
be identified. I have investigated enough accident scenes that leave the
same tell tale signs. Boy racers with antilock brakes all assume they can
go faster and no one will know. How wrong they are.


True, they do leave regulation patterns. But an accident investigator
told me they are pretty faint and wear off faster by traffic.

Regards, Joerg

http://www.analogconsultants.com

Joerg January 8th 06 12:28 AM

Doppler Radar
 
Hello Brian,


Keep the dogs under control as responsible people keep their children under
control.


Even then it can still happen and we all have to use our cars carefully.
One kid didn't get injured because I was going 15mph in a 25mph zone
(the street where we live). It dashed out when the garage was opened,
zooming into the road from behind a van. Couldn't see it coming but I
never go faster on that street, for that very reason. I came to a stop
about one foot before the child.

Regards, Joerg

http://www.analogconsultants.com

James T. White January 8th 06 12:51 AM

Doppler Radar
 
"RST Engineering" wrote in message
...
B) It is a private dead-end road owned in mutual easement between the

four
families that live at the end of it about half a mile off the county

road
that serves it. The county mounties have nothing to say about what

goes on
on the road.


So go have a talk with the parents in the other three families and ask
them to get control of their kids. Better yet, send the responsible
ones a bill for your new dog.

--
James T. White



maxfoo January 8th 06 01:03 AM

Doppler Radar
 
On Sat, 7 Jan 2006 16:05:43 -0800, "RST Engineering"
wrote:

why can't you just
ATFQ?


because this is newsnet and anything goes. ;)




RST Engineering January 8th 06 02:25 AM

Doppler Radar
 
What a fu**ing jerk. I asked a technical question in a technical newsgroup.
I expect a technical answer.

As to your political and ethical questions to my question, go find another
newsgroup to tell others how to live. Our little tiny community knows how to
do it, we all agree on the problem, and we're going to solve it. I'm
providing the technical know-how.

And don't tell me how to use local law enforcement or local political action
how to do it. I've spent 12 years of my life in local elective office at
the highest local levels. I don't need your unsolicited advice on how to
work the system.

Please, no more of this crap. Anybody with a source for doppler radars,
please post. Others, BUTT OUT.

Jim



"Brian" wrote in message
...


RESPONSIBLE parents do not let their children run out in the road, idiots
that allow dogs to run free in the road need to be aware that they can
cause accidents.




RST Engineering January 8th 06 02:26 AM

Doppler Radar
 
What a fu**ing jerk. I asked a technical question in a technical newsgroup.
I expect a technical answer.

As to your political and ethical questions to my question, go find another
newsgroup to tell others how to live. Our little tiny community knows how to
do it, we all agree on the problem, and we're going to solve it. I'm
providing the technical know-how.

And don't tell me how to use local law enforcement or local political action
how to do it. I've spent 12 years of my life in local elective office at
the highest local levels. I don't need your unsolicited advice on how to
work the system.

Please, no more of this crap. Anybody with a source for doppler radars,
please post. Others, BUTT OUT.

Jim



"Brian" wrote in message
...


RESPONSIBLE parents do not let their children run out in the road, idiots
that allow dogs to run free in the road need to be aware that they can
cause accidents.





RST Engineering \(jw\) January 8th 06 02:30 AM

Doppler Radar
 
You are one of the idiots I don't ever want to live next to. We can talk to
the parents until we are blue in the face and the kids are going to be ...
kids.

Please butt out of this conversation.

Ji



"James T. White" wrote in message
...

So go have a talk with the parents in the other three families and ask
them to get control of their kids. Better yet, send the responsible
ones a bill for your new dog.

--
James T. White





RST Engineering \(jw\) January 8th 06 02:33 AM

Doppler Radar
 
That's because "Brian", an "experienced investigator" hasn't ever seen ALB,
although laymen such as I can translate it rather easily.

Brian is a jerknose.

Jim



..com



Mike Coslo January 8th 06 03:28 AM

Doppler Radar
 
RST Engineering wrote:
What a fu**ing jerk. I asked a technical question in a technical newsgroup.
I expect a technical answer.

As to your political and ethical questions to my question, go find another
newsgroup to tell others how to live. Our little tiny community knows how to
do it, we all agree on the problem, and we're going to solve it. I'm
providing the technical know-how.

And don't tell me how to use local law enforcement or local political action
how to do it. I've spent 12 years of my life in local elective office at
the highest local levels. I don't need your unsolicited advice on how to
work the system.

Please, no more of this crap. Anybody with a source for doppler radars,
please post. Others, BUTT OUT.

Jim


Hi Jim,

I don't know if I'm going to be graciously asked to butt out, but what
do you expect to gain by an alarm that goes off when presumably some
pre-set speed is exceeded? I do know that when I was a teenager, I would
have viewed such a thing as an almost irresistible attractant.

If you want a radar-based device, get an old police radar gun, and
design an interface to a camera to photograph the licenses of the cars.
Perhaps the parents of these miscreants might enjoy seeing what their
larvae are doing with the family jitney!

Sorry about the dog. 8^(

- 73 de Mike KB3EIA -

Mark January 8th 06 03:49 AM

Doppler Radar
 
I saw a radar gun for sale at Radio Shack....

Mark


[email protected] January 8th 06 05:25 AM

Doppler Radar
 

Dan Richardson wrote:
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

no offense but:

ramsey's kiit emits all of about 500 microwatts at 1.6 ghz, useless
for dogs, but Ok for part 15 radar of cars.

try www.shfmicro.com

Steve Roberts


Saandy , 4Z5KS January 8th 06 08:48 AM

Doppler Radar
 
...try Philips . they manufactured once a module working in the X band
for security detectots, doors openers and suchlike. if I remember
correctly iwas named CL-8XXX.


Scott January 8th 06 01:53 PM

Doppler Radar
 
How about a gate at the end of the road that can be opened by the users
with a garage door opener, ie a gated community of sorts. If it's a
private road, keep others off.

RST Engineering wrote:

A) We aren't in a "town", rather we are pretty far out into the country.

B) It is a private dead-end road owned in mutual easement between the four
families that live at the end of it about half a mile off the county road
that serves it. The county mounties have nothing to say about what goes on
on the road.

C) I realize that this is newsnet and anything goes, but why can't you just
ATFQ?

Jim



Go to your local police department and have them monitor the speeders with
a
automated speed display unit. What! they don't have one in your town?
bring it
up at the next town meeting... ;)





Wes Stewart January 8th 06 02:35 PM

Doppler Radar
 
On Sat, 7 Jan 2006 14:47:08 -0800, "RST Engineering"
wrote:

What illegal? I can either retune it for a ham band or reduce power if
necessary. I'll find the hardware first and figure out the legal later.


Well, I know I'm going to be asked to leave this discussion but,
technically, unless you are IDing with your call sign every 10
minutes. it would be illegal. I seriously doubt that this was in your
plan.

Police radar guns, should you come up with one, are also licensed to
the department, assuming the cops are following the law, always a
dubious proposition.

So, because these are -technical- newsgroups, I was being -technical-.

Now for a "prohibited" non-technical suggestion, here is one that I am
contemplating. I too live on a short, private, single-lane road, that
serves four multi-acre homesites. I am plagued by the guys driving
delivery trucks (DHL, UPS, etc) who roar down the road in a cloud of
dust while delivering to my neighbors. I have complained to UPS
repeatedly without success.

So one of these days, when I'm up to it, after they go by on the way
to the neighbor's house, I'm going to take my truck out and block the
road for 15 minutes. (A second offense will call for a penalty of 30
minutes, etc) UPS seems to have a deal with law enforcement that
exempts them from speed limits on public roads, but in AZ the statutes
say:

28-628. Rights of real property owners

This chapter does not prevent the owner of real property that is used
by the public for purposes of vehicular travel by permission of the
owner and not as a matter of right from:

1. Prohibiting that use.

2. Requiring other, different or additional conditions than those
specified in this chapter.

3. Otherwise regulating the use as deemed best by the owner.

In other words, I get to regulate the speed (I've posted it as 10
MPH). I have no power to fine UPS, but I can still cost them money.

Fred Bloggs January 8th 06 02:42 PM

Doppler Radar
 


Wes Stewart wrote:


28-628. Rights of real property owners

This chapter does not prevent the owner of real property that is used
by the public for purposes of vehicular travel by permission of the
owner and not as a matter of right from:

1. Prohibiting that use.

2. Requiring other, different or additional conditions than those
specified in this chapter.

3. Otherwise regulating the use as deemed best by the owner.

In other words, I get to regulate the speed (I've posted it as 10
MPH). I have no power to fine UPS, but I can still cost them money.


You are not reading the wording carefully; it is the "not as a matter of
right from" that you are missing. It very well may be a matter of right
if the private road is co-owned by the other property holders and this
ownership allows them the right to transact business in the way of
receiving deliveries as they choose.


Jim Thompson January 8th 06 02:54 PM

Doppler Radar
 
On Sun, 08 Jan 2006 07:35:15 -0700, Wes Stewart
wrote:

On Sat, 7 Jan 2006 14:47:08 -0800, "RST Engineering"
wrote:

What illegal? I can either retune it for a ham band or reduce power if
necessary. I'll find the hardware first and figure out the legal later.


Well, I know I'm going to be asked to leave this discussion but,
technically, unless you are IDing with your call sign every 10
minutes. it would be illegal. I seriously doubt that this was in your
plan.

Police radar guns, should you come up with one, are also licensed to
the department, assuming the cops are following the law, always a
dubious proposition.

So, because these are -technical- newsgroups, I was being -technical-.

Now for a "prohibited" non-technical suggestion, here is one that I am
contemplating. I too live on a short, private, single-lane road, that
serves four multi-acre homesites. I am plagued by the guys driving
delivery trucks (DHL, UPS, etc) who roar down the road in a cloud of
dust while delivering to my neighbors. I have complained to UPS
repeatedly without success.

So one of these days, when I'm up to it, after they go by on the way
to the neighbor's house, I'm going to take my truck out and block the
road for 15 minutes. (A second offense will call for a penalty of 30
minutes, etc) UPS seems to have a deal with law enforcement that
exempts them from speed limits on public roads, but in AZ the statutes
say:

28-628. Rights of real property owners

This chapter does not prevent the owner of real property that is used
by the public for purposes of vehicular travel by permission of the
owner and not as a matter of right from:

1. Prohibiting that use.

2. Requiring other, different or additional conditions than those
specified in this chapter.

3. Otherwise regulating the use as deemed best by the owner.

In other words, I get to regulate the speed (I've posted it as 10
MPH). I have no power to fine UPS, but I can still cost them money.


You're probably going to get into "co-ownership" issues regarding the
access easement. How is the road ownership defined... everyone grant
an easement to the others?

A neighbor may sue you for "interference" in his business.

Where in AZ are you?

...Jim Thompson
--
| James E.Thompson, P.E. | mens |
| Analog Innovations, Inc. | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| Phoenix, Arizona Voice:(480)460-2350 | |
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I love to cook with wine. Sometimes I even put it in the food.

Fred Bloggs January 8th 06 03:16 PM

Doppler Radar
 
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.


You should just lay down some pressure switch hose and get a Parallax
BASIC STAMP kit from Radio Shack. Parallax has wireless modules on their
site you can order to xmit the data to your house for timestamping,
archiving via a PC etc...The smarts will run off a 9V for months- you
can't say that about a Gunn osc xmtr or any of the other surplus junk.
And then there is the issue of weather-proofing and possible loss due to
vandalism- think hidden wireless camera activated by intrusion alarm in PIC.


Bill Janssen January 8th 06 04:21 PM

Doppler Radar
 
Wes Stewart wrote:

On Sat, 7 Jan 2006 14:47:08 -0800, "RST Engineering"
wrote:



What illegal? I can either retune it for a ham band or reduce power if
necessary. I'll find the hardware first and figure out the legal later.



Well, I know I'm going to be asked to leave this discussion but,
technically, unless you are IDing with your call sign every 10
minutes. it would be illegal. I seriously doubt that this was in your
plan.

Police radar guns, should you come up with one, are also licensed to
the department, assuming the cops are following the law, always a
dubious proposition.



There is a frequency near 10.5 GHz assigned for unlicensed door openers etc.
I have a few of the Gunn units that came from door openers.

Bill K7NOM

some stuff snipped


RST Engineering January 8th 06 05:34 PM

Doppler Radar
 
Precisely the plan, Wes. The horn serves two purposes. One, it alerts the
transgressor that they pushed the button. Two, it alerts me to fire up the
truck and block the road.

As others have pointed out, a two pressure hose setup and some simple math
in a microprocessor of some sort would serve the same purpose at far less
current draw, but I'd like to try the radar gun first.

Hell, Jim Thompson went on for two weeks about how to detect a school bus
pulling up in front of the house. I thought this one would go on for at
LEAST as long {;-)

BTW, Jim, what was your ultimate solution to that problem?

Jim


Now for a "prohibited" non-technical suggestion, here is one that I am
contemplating. I too live on a short, private, single-lane road, that
serves four multi-acre homesites. I am plagued by the guys driving
delivery trucks (DHL, UPS, etc) who roar down the road in a cloud of
dust while delivering to my neighbors. I have complained to UPS
repeatedly without success.

So one of these days, when I'm up to it, after they go by on the way
to the neighbor's house, I'm going to take my truck out and block the
road for 15 minutes. (A second offense will call for a penalty of 30
minutes, etc) UPS seems to have a deal with law enforcement that
exempts them from speed limits on public roads, but in AZ the statutes
say:




Frank Bemelman January 8th 06 05:42 PM

Doppler Radar
 
"RST Engineering" schreef in bericht
BTW, Jim, what was your ultimate solution to that problem?


No solution at all, I'd guess. JT is full of ****, being the miserable
piece of **** that he is.


--
Thanks, Frank.
(remove 'q' and '.invalid' when replying by email)





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