Wideband Transmitter Design

Why not just throw a brick through the window of the nearest police station?

John

:>Thanks for any ideas on this subjdect

Dont.

I built an FM transmitter that constantly scans the FM broadcst band and locks on a particular freq when a microphone located outside my car picks up the 1000hz tone broadcat by the transmitter. Pressing a button generates a single sweep of the band and goes practically unnoticed by nearby listeners who happen to hear it on the radio. Only if the radio receiver is putting out a couple hundred watts will I get a lock. You can imagine how much fun this can be. Only problem I have with it is that few people who have these loud stereoes in their car listen to FM but I do catch a few.

I'm extremely glad you don't know shit from apple butter about electronics. If you did, you'd start with Marconi's sparkgap XMTR and go from there.

Then, you'd spend ten to twenty years in jail.

Mark L. Fergerson

A sparkgap's a terrifically effective gadget for wiping out AM over a very broad band indeed, but with most comms now operating in other modes, it's far less effective, I'm afraid. Aircraft comms are still AM, though and since you're line-of-sight with them, you might bring a few planes down even if you can't screw up Starbucks' muzac.

--

"Windows [n.], A thirty-two bit extension and GUI shell to a sixteen bit patch
               to an eight bit operating system originally coded for a four bit 
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No he won't, aircraft operators have very elaborate com failure procedures. OTOH, he will have the FCC and the FAA at his doorstep in no time. Which is in turn what he will have to serve.

Michael

A spark gap is not the best idea for a jammer. They are inefficient. Somewhat audibly noisy also - presumably you'd want to be surreptitious in your activity . . . Also you run the risk of interrupting more than the person you find offensive.

I like the idea I saw on the web. The guy used the final amplifier and exciter from a junk cell phone and a sweep generator to rapidly switch frequencies. The people that built them claimed they worked well for local disruption in shopping malls, restaurants, and on the road.

Professional/commercial cell jamming devices probably use the same scheme. See

or

Use Google to search the newsgroups

Search on the phrase "cell phone jammer" and or "cell phone" +jammer the schematic I saw may still be up and about somewhere (I know I copied it).

From the newsgroups search I just ran:

I don't know if it works or not, but with all new parts it won't set you back more than $20 or so.

-----= Posted via Newsfeeds.Com, Uncensored Usenet News =-----

- The #1 Newsgroup Service in the World!

-----== Over 100,000 Newsgroups - 19 Different Servers! =-----

Complaint sent to Google with copies to FBI and FCC ;-)

...Jim Thompson

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|  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.

Quite true. A competently imaginative neoLuddite asshole would look at Marconi's loop and think about slide trombones. Getting it to slide fast enough to bugger FM/PM/PWM/ agile comms will be, um, difficult unless he considers altering its length electrically, switching through a series of loops (a la "multiwave" antennae), or something like that. Hell, I thought that up thirty years ago (but didn't try it).

I hope he enjoys buggering (or rather being buggered). If he's successful, he'll get plenty, especially if he follows any of the hints he gets here, so keep 'em coming!

Mark L. Fergerson

place that had/has the cell phone jammer schematic

-----= Posted via Newsfeeds.Com, Uncensored Usenet News =-----

- The #1 Newsgroup Service in the World!

-----== Over 100,000 Newsgroups - 19 Different Servers! =-----

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jimmy,you're a dick lol, go find a church somewhere and bother them instead,what an idiot