Is there a way to jam cell phones?

[Unsecured Loner]

I would love to have a jammer in my car. When I see one of those people talking a mile a minute and not paying attentio to their driving, I could press a button and zap 'em. It would be good to have in restaurants and public gatherings too. If there isn't such a thing in existence, is it theoretically possible? It wouldn't have to be long range, just a few hundred feet would do.

[hd581]

What a malicious thought! Is that why you're an Unsecured Loner? heheh j/k

Obviously this device would not be FCC compliant. Actually, I'd like to have this device, too. I hear phones go off in our classrooms, which is bad. What's worse is when they answer it instead of shutting it off.

[This message has been edited by hd581 (edited 04-21-2000).]

[Banti]

It is possible. All the device would have to due is transmit at the freq of the phone at overpower the phone.

This however would be very illegal. The FCC has specfifc rules about what devices can broadcast at certain freqs. It would be a great product, but unless you talk to the feds first...they will be after you...like in the movie Pump up the Volume

Banti

~~EDIT looks like hd581 reponded while I was typing http://www.sysopt.com/forum/smile.gif

[This message has been edited by Banti (edited 04-21-2000).]

[RobRich]

Yes, jamming any known frequency is very possible. You just need enough interference produced at the right wave length. The only thing is that I can't post anything concerning this due to FCC laws here in the US.

-Looks like I posted the same thing as the same time as Banti http://www.sysopt.com/forum/smile.gif

[This message has been edited by RobRich (edited 04-21-2000).]

[Unsecured Loner]

Oh geez, am I gonna have the Feds coming to see me? It was just a subject for thought, ok?

[jad1097]

It seems to me if you jammed their phone they would pay less attention to the road and more to the phone that just cut out on them.

[Szech]

It was a nice idea at least. Last week in class, someone's cell phone went off, and after fumbling around for 20 seconds, with "Take me out to the ball game" going, they answered it, and THEN THEY STARTED HAVING A CONVERSATION IN CLASS. It wasn't a lecture either, it was a discussion section (~30 students if you didn't know). All those tones annoy me. It's like a jukebox that only plays crappy music and at the worst times.

[barry glisson]

classroom cell phones are easy to control. if your phone rings you loose a letter grade as a to b.second time youre out of here. barry

[Barney]

I know a way to jam cell phones!
With concrete!
LOL http://www.sysopt.com/forum/biggrin.gif .

Restaurant must be made from only concrete from now on!

I don't care I just said it what jammes them,I have already got the CIA on my tail,why not the feds too!

Ronald

[This message has been edited by Barney (edited 04-22-2000).]

[Szech]

Concrete will block cell phone transmissions?

BTW Barry, I'm not a TA, I'm a student! I wish I had control over grades though. "You there, turn your desk to the side, put these billiard balls in your mouth, write I am stupid on a blanket and put the blanket over your head or I'll give you an F." Oh the power!

[Barney]

Isn't it true that cell phones don't work in those concrete parking garages (I have tried out myself a while ago).That's the reason that in some buildings you have to move to a window because there's a lot of concrete in that building (you are surrounded by it)what causes that you cannot receive/send any signal.

Is that stupid?

[Algee7]

On a related , mischievious note:

I used to have a device for testing radar detectors... It was very low powered but effective. I loved driving along and watching speeders hit the brake when I pressed my little button... Talk about fun! http://www.sysopt.com/forum/wink.gif Was great revenge against the tailgating, light-flashing idiots who always try to get there a minute faster http://www.sysopt.com/forum/smile.gif

Hmmm... where'd I put that thing, anyway...

[U-96]

well with analogue phones it's just a case of creating enough white noise across the frequency spectrum to blank it out... of course you would still need so much much power you'd cook yourself before it worked...

Digital stuff is a lot harder - most hacks I've read about seem to focus on convincing the phone that the base station is full, so they get a line busy tone...

It's a popular pursuit in Japan...


TOKYO, JAPAN, 1998 DEC 2 (Newsbytes) -- By Martyn Williams, Newsbytes. Hoping to put an end to the annoying audio pollution caused by cellular telephones, Japan's Ministry of Posts and Telecommunications has begun accepting licenses for equipment capable of blocking cell phone signals.


The MPT will approve applications from places like theaters and concert halls, where ringing cellular phones are judged to cause public nuisance. The regulator, which also hands out licenses to cellular operators and approves their ever-expanding networks, will seek to keep a balance between the right to enjoy the benefit of communication and that relating to keeping tranquillity.


With the appropriate equipment installed and switched on, cellular telephones become useless as signals get jammed making both incoming and outgoing calls impossible.


The problem in Japan is particularly bad, where there are now more than 44 million mobile telephone users - equivalent to a phone in every other household. With multiple operators competing in the same market, prices continue to fall to the point where free handsets are the norm and calls cost little more than those from public telephones.


Reported By Newsbytes News Network: http://www.newsbytes.com

[jad1097]

I don't think it is the concrete that stops it I think it is all the steel in the concrete. If you have ever built a high rise or a parking garage you would see just how much steel goes in the slab.

[user0005]

Just try to get your hands on EMP shock wave thing, I think the government has them. Its suppose to shut down any electrical devices around a certain radius. Have you seen the Matrix? then you know what I'm talking about. Oh yeah, about the concrete just use a concrete brick to smash the phone.

[mudoggy]

EMP.. electromagnetic pulse?
Sure the government has em... they are in silos all over the midwest and west, and in submarines, on air force bases, etc.

Just detonate one over suspected users, and the pulse generated will knock out those pesky electrical devices. It will even melt the phones! Ummm.. and the people, and the cars, and the roads... hmmm Maybe a little too draconian for even the annoying cell phone users.

---
Yes, there is a ton of steel embedding in most concrete structures which provides the strength. I'm sure the concrete doesn't help much, but I bet the steel "rebar" (reinforcing bar) is the main culprit.
---
LOL ALgee.. some of my dad's acquantances had purchased (I'm assuming they bought it.. with those guys, who knows..)an old/surplus radar gun. Similiar fun when you hang out near an overpass and clock them as they go by... Let us know how you built that puppy!!
Can't microwaves set them off? I know in the city, waves from microwave towers and even some burglar alarms (motion sensors?) set them off..

[Apostle 83]

I got to see a minuteman silo blown up this past year, one of several hundred, we don't have as many silos in the dakota's, but we can get the job done

[Banti]

They should add copper grounding to all buildings. The copper grounding mesh would prevent signal from coming or going...but pagers would not work either...oh well.


Banti

[sys-eng]

There is a "prototype" EMP gun which can disable rocket lauchers, planes, tanks, radar sites, etc. but you need a small power plant (MW) to power it.

How about the poice just enforcing existing laws in most states and pulling the people over?

[psyklone]

i have an rf signal generator that i used to use for blocking out tv stations and radio stations. of course, i only did it as a joke and only did it for short periods of time ... and i didn't have it wired to a huge broadcast antenna. it was fun, but never malicious at all and although people that chat on their cell phones while they drive can be annoying i don't think that being an electronic vigilante would do anything to make the streets any safer.

http://www.sysopt.com/forum/smile.gif

[Algee7]

mudoggy, I didn't build the tester; got it from K-40. I used to install/service their radar detectors http://www.sysopt.com/forum/wink.gif

[sys-eng]

I believe it would really hurt them to jam their cell phones; but if you are insistent on trying it, I suggest --

drop a quarter and when they bend over --well, be sure to use lots of vaseline

[dkozloski]

There is a pocket carried device for sale in Japan that jams cell phone conversations over a limited range. This thing is intended for use by people who don't want to be disturbed in restaurants.
As a practicle matter, the FCC disbanded the largest share of their permanent monitoring stations in favor of mobile stations that respond to complaints. If you have a jammer in your car while driving around, the chances of getting caught are minimal. The transmitter power that it would take to tear up cell phone reception over a short distance is not likely to distrupt the operation of a whole cell any more than an electric razor or food mixer. Anything that produced a strong electric arc with anywhere near the correct antenna length would be indistinguishable from a high frquency welding machine.
Myself, I think some sort of homing missile would be more satisfying.

[U-96]

You mean like the Chinese have?
Seems a bit heavy-handed, but then what's new?
http://taiwansecurity.org/SCMP/SCMP-990422.htm

Oh, this looks like an American variant... and you thought power outages in Yugoslavia were caused by explosives...
http://www.infowar.com/mil_c4i/mil_c4i8.html-ssi

Agent U-96