Any knowledgeable advice wanted for transmitter

J

John M.

Guest
I am NOT trying to build a radar detector NOR am I trying to build a
radar scrambler! I want to build some sort of portable (powered by 9v
battery)... low-emittance but effective 'radio wave transmitter' that
I can use to set other people's radar detectors off. I have seen
other people use these devices on the interstate before and I couldn't
help but relish in the sight of the guy flying by doing 90Mph suddenly
hitting his breaks because his detector chirped. It can't be too hard
to make one of these devices from some Radioshack parts, as I have
seen several pocket sized varieties for sale on the internet that
unfortunately lacked any instructions. I just don't know how you
would produce 9ghz - 30ghz waves from a portable device, if it is even
possible. :( If you have any knowledge in this area your help would
be appreciated! Thank you.
 
To build something in that frequency range that will send out a signal is
not something that you will find the parts at the local Radio Shack. At
these frequencies you are in the use of waveguide and stripline technology.
To have an oscillator to transmit in this range is more complex than the
receiver part.

There are low cost radar receivers, and the manufactures have mass produced
and mass tune the component sections for this type of application.

You would most likely do not have any feasible access to the proper
instruments to even test the device to see if it is working in the case that
were to attempt to build one. I am going on the base of how you are asking
the question. There are very few companies and manufactures that have such
equipment. This is very specialized.

As for building even a low power transmitter that would work at these
frequency ranges, there are many legal, and especially radiation safety
issues. It is illegal to transit any type of RF signal without proper
approval, or permit, or authorization from the authorities governing this.

--

Greetings,

Jerry Greenberg GLG Technologies GLG
=========================================
WebPage http://www.zoom-one.com
=========================================


"John M." <bethulga@yahoo.com> wrote in message
news:eb095cbb.0401110218.54b40701@posting.google.com...
I am NOT trying to build a radar detector NOR am I trying to build a
radar scrambler! I want to build some sort of portable (powered by 9v
battery)... low-emittance but effective 'radio wave transmitter' that
I can use to set other people's radar detectors off. I have seen
other people use these devices on the interstate before and I couldn't
help but relish in the sight of the guy flying by doing 90Mph suddenly
hitting his breaks because his detector chirped. It can't be too hard
to make one of these devices from some Radioshack parts, as I have
seen several pocket sized varieties for sale on the internet that
unfortunately lacked any instructions. I just don't know how you
would produce 9ghz - 30ghz waves from a portable device, if it is even
possible. :( If you have any knowledge in this area your help would
be appreciated! Thank you.
 
Look around theere are plenty of speed gun type kits available that are
battery powered. MA/COM also make 10.7 and 24.15 GHz transceivers, but
these cost around the $100 mark. www.shfmicro.com used to sell them, but
they appear to be going out of business.

Al

John M. wrote:
I am NOT trying to build a radar detector NOR am I trying to build a
radar scrambler! I want to build some sort of portable (powered by 9v
battery)... low-emittance but effective 'radio wave transmitter' that
I can use to set other people's radar detectors off. I have seen
other people use these devices on the interstate before and I couldn't
help but relish in the sight of the guy flying by doing 90Mph suddenly
hitting his breaks because his detector chirped. It can't be too hard
to make one of these devices from some Radioshack parts, as I have
seen several pocket sized varieties for sale on the internet that
unfortunately lacked any instructions. I just don't know how you
would produce 9ghz - 30ghz waves from a portable device, if it is even
possible. :( If you have any knowledge in this area your help would
be appreciated! Thank you.
Click to expand...
 
In article <eb095cbb.0401110218.54b40701@posting.google.com>,
bethulga@yahoo.com mentioned...
I am NOT trying to build a radar detector NOR am I trying to build a
radar scrambler! I want to build some sort of portable (powered by 9v
battery)... low-emittance but effective 'radio wave transmitter' that
I can use to set other people's radar detectors off. I have seen
other people use these devices on the interstate before and I couldn't
help but relish in the sight of the guy flying by doing 90Mph suddenly
hitting his breaks because his detector chirped. It can't be too hard
to make one of these devices from some Radioshack parts, as I have
seen several pocket sized varieties for sale on the internet that
unfortunately lacked any instructions. I just don't know how you
would produce 9ghz - 30ghz waves from a portable device, if it is even
possible. :( If you have any knowledge in this area your help would
be appreciated! Thank you.
Click to expand...
The automatic door opener sensors, those small boxes above the door,
have a diode in them called a Gunn diode AKA gunnplexer that generates
10 GHz RF, and will set the detector off. You can buy one new, or get
one used, from demolition sites, etc. These parts are not available
at Radio Scrap. Hams have sources where they can get them. See URL
http://www.wa1mba.org/10ggunn.htm

But with all that said, why not just buy one of those detector
triggers that they sell in the back of magazines. They're cheap,
already built into a nice handheld package, and probably better since
they're made to do the job you're asking for. No fuss, no muss.

--
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