Re: Addendum to "Schematics for building a broad band frequency jammer"

From: Me (no-address_for_spammers_at_no-address.com)
Date: 09/19/04 

Date: Sun, 19 Sep 2004 00:59:54 -0400

On Sat, 18 Sep 2004 23:19:22 -0400, "Meat-->Plow"
<Meat@petitmorte.net> wrote:

>On Sat, 18 Sep 2004 23:07:07 -0400, Me
><no-address_for_spammers@no-address.com>,wrote:
>
>>On Sat, 18 Sep 2004 22:50:31 -0400, "Meat-->Plow"
>><Meat@petitmorte.net> wrote:
>>
>>>On Sat, 18 Sep 2004 22:18:06 -0400, Me
>>><no-address_for_spammers@no-address.com>,wrote:
>>>
>>>>On Sat, 18 Sep 2004 21:29:26 -0400, "Meat-->Plow"
>>>><Meat@petitmorte.net> wrote:
>>>>
>>>>>On Sat, 18 Sep 2004 21:18:04 -0400, Me
>>>>><no-address_for_spammers@no-address.com>,wrote:
>>>>>
>>>>>>On Sun, 19 Sep 2004 00:23:04 GMT, dward7@earthlink.net (don ward)
>>>>>>wrote:
>>>>>>
>>>>>>>> If you need schematics for a simple FM transmitter that's
>>>>>>>very easy to build, yet very effective I can help you there. I've
>>>>>>>built and used several on this design. In fact, there's a drag strip
>>>>>>>in GA using a transmitter I built off of this schematic using it to
>>>>>>>transmit race stats so people can listen in their cars and with head
>>>>>>>sets so they can hear over the loud car exhaust. Also got the board
>>>>>>>foil design and component layout making it super simple to build if
>>>>>>>you want to go the professional route.
>>>>>>>
>>>>>>>How or where do i obtain the schematic and cb layout ??
>>>>>>>dnw
>>>>>>>dnelsonone@yahoo.com
>>>>>>
>>>>>>
>>>>>>Let me run to my office (where it happens to be), grab it and scan it
>>>>>>then I'll stick it on one of my web servers and post a URL.
>>>>>
>>>>>
>>>>>What's the power input to the final and what final amp ?
>>>>
>>>>9 vdc keeps it legal, but it'll take considerably more.
>>>>As far as the final... ugh... IIRC the final was a 2N3096, but I'm not
>>>>sure now. It's been quite a few years since I did anything with that
>>>>print. Will post when I've got it up.
>>>
>>>Hmm that 2N3096 is just a little what, 500 mw max ?
>>>
>>>IIRC what I had had a single stud mounted MRF 315. 4 watts
>>>input, 40 something out on a 28 volt Vcc.
>>
>>Don't recall now. Was thinking the 2N3906 would handle 1.5 W, but my
>>books are at the office... and that may not have been the final
>>anyway. I just don't remember. I do recall that heat dissipation, not
>>max VCEO was the limiting factor on the power output and hence input
>>voltage. Will post when I have it.
>>
>>The nice thing about this little gadget is that it can be built on a
>>board the same size as the 9v battery driving it making for a very
>>compact unit and it'll still make a mile with a decent antenna.
>>Actually, I've got plans for much smaller transmitters designed for
>>use as "bugs" that aren't much larger than the 2032 button cells that
>>drive them although the range is considerably less. I've never
>>bothered to assemble one though. This sort of thing would be just an
>>experimental toy to me as I have no real use for such.
>
>I've seen those things in -kit- form. Some with stereo
>output. 9 volts keeps the power under the legal limit but
>crank it up to 15 and it doubles. I set up one for a guy who
>had a drive-in restaurant. He had a 50's theme and wanted to
>broadcast 50's music for the drive in customers. Worked
>pretty decent once I found a spot that had no other local
>stations.

Ya, exactly the same thing I did for the drag strip. This wasn't a kit
though. I don't recall who did the circuit design or where I got it
from but it was just a schematic and description. I did the board foil
design for it on a computer several years ago and built a few.

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