mobile jammer

Sure you don't want to make a safe LED blinker?

from

" The Federal Communications Commission is charged with enforcing jamming laws. However, the agency has not yet prosecuted anyone for cell-phone jamming. Under the U.S. rules, fines for a first offense can range as high as $11,000 for each violation or imprisonment for up to one year, and the device used may also be seized and forfeited to the government. "

Jamming in movie theatres would be nice. It can be announced right on the big screen.. YOUR PHONES ARE NOW BEING JAMMED!

Question is: Would lots of people leave? :P

D from BC British Columbia Canada.

The movie theater near my home in Austin, Texas threatens an Ass- whoopin if patrons don't silence their phones. The theater is always packed.

Frank

hey thanks...

im from india.. it is not banned in our country.. so i guess i wont get any punishment.. im not planning to use it inside a theatre;) im planning to use it inside an examination hall!!

You can proberbly just send some burst at ~900 MHz (check exact frequency) with some time intervalls to jam the cellphones. And with little power aswell.

You are from India, or located in India. Do not make or use one of these in the United States. It's illegal.

I personally believe it is also unethical to use such a device. You don't know if you'll be causing harm (i.e. a doctor who forgets to put his phone in vibrate). It happens. Your desire not to be bothered by a cell phone ring is likely inconsequential to the harm that might occur.

Hello San,

Why not putting several simple AC diode detectors with LF amplification at the examination hall (assuming GSM or other pulsed digital system)?

It is not a guarantee (for non-ringing phones) because the cell phone may not connect to the base station frequently, but an illegal call or SMS will be detected. When placing many of such devices, you can have some estimate of where the transmitting cell phone is.

Best regards,

Wim

Gee, and you make it sound SO easy! :(

--
Service to my country? Been there, Done that, and I\'ve got my DD214 to
prove it.

Get a PLL/VCO chip from Analog Devices or National Semiconductor. You'll need a microcontroller to send the 96 or longer bit word to set the N, R counters. Then design a wide loop filter to modulate the vco with pseudorandom noise. Then add a hefty output rf amplifier...and you're good to go!...That was easy!

So what system and band do the cell phones use there?

I expect more like to reduce cheating, which has become very profitable.

Google may help you. But in many countries operating such a device is considered a severe crime. So you may end up in jail. If someone gets an heart-attack and dies because your device was making it impossible to dial emergency services you may find yourself involved in a long civil lawsuit which propbaly results in you having to give all your money to someone else for the rest of your life.

--
Programmeren in Almere?
E-mail naar nico@nctdevpuntnl (punt=.)

Wait a minute. If the doctor gets the call in the theater, how does that increase the heart attack victim's chance of survival? Isn't that more dependent on the quickness of the first responders? If the doctor says, 'Well, I was in the movies and my phone didn't ring' how does that imply there was a jammer in the theater? Pretty long stretch so far.

Backwards thinking...

Try it this way: Jack and Jill are in the theater enjoying a thrilling DIsney movie. Jack has a heart attack just as the cute rabbit is about to be (rightfully) blown away. Jill, tries to call emergency services but her cell phone won't work...

Jill won't leave her husband, but the nice lady (named "Blondie") says she'll go find a phone and call an ambulance. Blondie remembers that the phone in her apartment works, so she goes home and calls. Sadly her apartment is about 25 minutes from the theater.

In the meantime, Jack dies.

Jill never was able to call 911.

And Bob, the theater owner who had the (now discovered) cell phone blocker, is facing a really expensive law suit.

THings were so much simpler back in 1921 when we didn't have cell phones. Just think, back then we'd have been able to save Blondie from driving all the way home just to make that call...

It's been a long time since I was willing to have my feet stick to the floor of a movie theatre. Aren't there pay phones in the lobby any more?

Haven't you noticed? The cell phone has nearly exterminated the pay phone industry.

--
Service to my country? Been there, Done that, and I\'ve got my DD214 to
prove it.

On Sun, 24 Feb 2008 05:52:59 -0800, mpm wrote: ...

Oh, feh. Somebody misses a stupid phone call, and somebody dies as a consequence? If somebody's job is that important, they shouldn't be going to the movies while they're on duty.

Cheers! Rich

If somebody's going to die over a stupid phone call, then that person shouldn't have been sitting in the movie theater when they're on duty.

Cheers! Rich