gary350

I need a cell phone blocker FCC maximum 100 mw output. I need to block all cell phone in a distance of about 50 ft 100 mw should do that. A power osc should do the job. Anyone got a good working circuit drawing already?

zachtheterrible

A cell phone jammer with 100 watt output would jam the entire city, and possibly the entire county :lol:

100 milliwatt would be more like it.

Unfortunately what you want to do is strictly illegal.

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I'm no electronics god, i just talk too much.

Oznog

"FCC maximum"? I'm confused. Deliberately interfering with a wireless device is generally illegal by FCC.

Blocking cell is difficult, since many channels are involved even within a single service. If I'm not mistaken different services may use different areas of the spectrum as well.

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I thought what I'd do was I'd pretend I was one of those deaf-mutes.

audioguru

You can buy them overseas. They are used to block cell phones in theaters. Their manufacturers refuse to ship them to civilized countries so you have to go there to get one.

Your insurance company won't cover you when you are sued for blocking an urgent cell phone call to 911 (or 999 in some uncivilized countries).
:cry: :cry:

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Uncle $crooge

zachtheterrible

Many channels being used is no problem, you just need wideband noise.

I heard on the radio that theateres are asking the FCC to allow cell phone jammers in theatres, but the FCC won't have it :lol:

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I'm no electronics god, i just talk too much.

audioguru

A single frequency isn't a problem to jam. Maybe a signal of only 1W will work.
Wideband is a different story if each frequency needs 1W and there are hundreds of frequencies.

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Uncle $crooge

zachtheterrible

In such a small proximity though, you wouldn't need much power for a wideband jammer?

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I'm no electronics god, i just talk too much.

audioguru

It depends entirely on how close the cell transmitter is. If it is close-by, you won't be able to block it. If it is far away then the cell phone will crank up its RF output to over 1W and you might not be able to block it with wideband noise.

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Uncle $crooge

Nigel Goodwin

Of course they won't! - no regulatory authority would!.

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Styx

just use good old tin foil, or even better ferrous-lined walls

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Nothing is impossible.
Once a problem is realised, the rest is just details

audioguru

Aren't half the folks on a cell phone in a theater talking to the other half of the people on a cell phone in the same theater?
But not directly since the central office is in between.

Haven't you seen a couple walking down the street and both are using their cell phone? It looks funny. I always think they are talking to each other over the cells. :lol:

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Uncle $crooge

mstechca

that is so funny! :lol:
nothing like wasting 20 cents (or more) a minute on talking to someone ten inches away from you!

And if you want to do legal jamming, do what I do. Make a small dinky little transmitter (like my posted one) that transmits about 50 to 100 feet, and tune every single radio in your house on the same frequency, and hook up the output of your soundcard (from your computer) to the transmitter's input!

The only outside people that will be jammed are those that are about 3 to 10 meters away from your transmitter. You can of course lower the battery voltage or increase resistance.

Better yet, jam on 109Mhz, and turn your radio dial all the way to the right until it is stuck there :lol:

you get the picture, SHOW COURTESY, and jam on a screwed up station!!!

Now people have more to choose from, and will get so interested in the action coming from your computer, THEY WANT MORE!!!

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-=: The best low-priced components to troubleshoot with are the speaker and the LED :=-

audioguru

My cell phone with the camera and huge memory was free and my daughter got another for free. They can call anyone, any time for free for the 1st month then free only on evenings and weekends. They are also free to call each other anytime forever.
As part of the cell-phone deal, my daughter got a free portable DVD player. All she had to do was to sign her life away for 3 years (cell phone subscription) at a pretty good rate.

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Uncle $crooge

zachtheterrible

Eh audio, I'm not talking about jamming the cell phone's outgoing signal. That would be nearly impossible. I'm talking about jamming the signal coming from the cell-phone tower. That would be a lot easier.

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I'm no electronics god, i just talk too much.

akg

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