How can you jam a GPS device and cell phones!

blyslv · Post by **blyslv** » Mon Jan 12, 2004 3:37 pm

>Afghani President Pervez Musharraf's

<pedantic>
Dude is actually the prez of Pakistan. "Afgani" is a currency, inhabitants of Afganistan are called "Afgans."
</pedantic>

Guest · Post by **Guest** » Mon Jan 26, 2004 5:13 pm

don't a lot of movie theaters and hospitals have the cdma jammers installed?

nipples · Post by **nipples** » Mon Feb 02, 2004 11:59 pm

hello, A-Z Enterprizes!

i had made & pulled this post back on 12/28/03, ran across it in housekeeping tonight:

the downside of buying a jammer is escalation.... you jam some frequencies, they upgrade & you have come further high on the radar.

go low tech!

like my tin foil lined hat.

my steel toed boots.

keep it internalized!
(i do not worry about THEM getting into
my head, i worry about ME spilling out my ears & feet)

plus i know i am good.
(i know they are good)

i have done no wrong.
(they have done no wrong)

i am not ashamed of my travels.

i have not one curtain on my windows.

i have no need of fear.

everyone loves the bunny inside.

i love the bunny inside them.

two

provide alternating source grinder
such as on foot attach chain by shoe

in vehicle ground suspended from bumper provide bouncing weight playful ground (bouncing).

alternate current +-

when done, hair on neck of back
rise lower extremeties,
though not deep-muscle paralysis!

this has been work for me.

send picture!

DE FACTO · Post by **DE FACTO** » Tue Feb 03, 2004 1:14 am

genghis wrote:don't a lot of movie theaters and hospitals have the cdma jammers installed?

No they dont but thanks.

I see a money market there also.

Wind_Borne · Post by **Wind_Borne** » Tue Feb 03, 2004 1:23 am

I seem to recall that a transmitter of upto 100 milliwatts does not require licensing. So I'm thinking that any such unit transmitting random noise on the frequency that AuldAne identifies below would block the GPS signal locally -- and that's all you need or want. Just enough power to jam the signal in a 10 foot radius would be perfect. You could test your jammer using a handheld GPS unit.

As for non-GPS cell phone positioning, that requires the presence of cells -- not really a problem on the playa. If the system uses cellular positioning they may notice you driving through Nixon or Gerlach, but little else. In fact this technology is little used due to this limitation.

In the cellular/GPS vehicle tracking used by shipping companies the cell phone part calls the home base periodically to update the vehicles GPS position and course. Between calls the course is tracked and stored. So it's the GPS component that must be spoofed.

AuldAne wrote:Okay, I used to work with GPS units during my academic years, and although it never occurred to me to try and find a way to jam the signal...

Intentional interference
Intentional interference is another matter. The GPS satellite is at a medium orbit of 11,000 miles and transmits with a power of just one watt. The received power on the ground is 1 x 10-16 watt - one ten quadrillionth of a watt. A simple 5 watt noise jammer on the GPS frequency can kill the GPS signal to a range of 200 kilometers (120 miles). A jammer borne by a small weather balloon can kill GPS in an area 800 miles wide.
http://www.findarticles.com/cf_dls/m0UB ... icle.jhtml

I believe that the correct frequencies to jam are 1575.42 MHz for military and 1227.6 MHZ for civilian.

http://www.navcen.uscg.gov/cgsic/meetin ... /faaad.pdf

http://www.aero.org/news/current/gpsSignal.html

DE FACTO · Post by **DE FACTO** » Tue Feb 03, 2004 1:32 am

Wind_Borne wrote:I seem to recall that a transmitter of upto 100 milliwatts does not require licensing. So I'm thinking that any such unit transmitting random noise on the frequency that AuldAne identifies below would block the GPS signal locally -- and that's all you need or want. Just enough power to jam the signal in a 10 foot radius would be perfect. You could test your jammer using a handheld GPS unit.

That's PM info.

Where's the challenge for folks like myself?

Wind_Borne · Post by **Wind_Borne** » Tue Feb 03, 2004 1:40 am

A couple of decades ago someone published the steps of how to build a nuclear bomb; and the Supreme Court upheld the right to do so under the First Amendment.

My earlier post is intended to elucidate. Please note that while a low power transmitter may not need to be licensed, it does not necessarily follow that intentional jamming is legal. Someone else may wish to research that issue.

Disclaimer enough, DF?

DE FACTO · Post by **DE FACTO** » Tue Feb 03, 2004 1:52 am

well.....hmmmm.

I saved the whole thing anyway..........

say no more.

Zane5100 · Post by **Zane5100** » Tue Feb 03, 2004 3:04 pm

DE FACTO wrote:
Wind_Borne wrote:I seem to recall that a transmitter of upto 100 milliwatts does not require licensing. So I'm thinking that any such unit transmitting random noise on the frequency that AuldAne identifies below would block the GPS signal locally -- and that's all you need or want. Just enough power to jam the signal in a 10 foot radius would be perfect. You could test your jammer using a handheld GPS unit.
That's PM info.

No, it isn't.

Last Real Burner · Post by **Last Real Burner** » Tue Feb 03, 2004 4:16 pm

Sidddown and shutup De Facto, this is an open conversation for just such info to be shared. Dick is a bad man, everyone hates Dick. Don't be a Dick.

most likely,
mr smith

Last Real Burner · Post by **Last Real Burner** » Tue Feb 03, 2004 4:19 pm

Myself wrote:Sidddown and shutup De Facto

I feel so much better now! Go ahead you guys try it!

quietly,
mr smith

DE FACTO · Post by **DE FACTO** » Wed Feb 04, 2004 12:58 am

Last Real Burner wrote:Sidddown and shutup De Facto, this is an open conversation for just such info to be shared. Dick is a bad man, everyone hates Dick. Don't be a Dick.

most likely,
mr smith

woa......I dont know how I missed this one.

Hey, I have really no problem with info posted here. I have a good time reading it and saving stuff as I posted previously.

Actually I think it's a good idea that the info be posted here so that outsiders that want to monitor the org understand the org is not to be messed with.

anyhoo.......carry on. nevermind me.

Wind_Borne · Post by **Wind_Borne** » Thu Feb 05, 2004 1:51 am

I can assure you, DF, that I have revealed nothing but published FCC regs. and prior art commonly known to radio hams throughout the world.

You may be interested to know that PMs do not escape notice. After 9/11 the government implemented a system, which I seem to recall is named Carnivore, that snarfs all emails and analyzes the content. Of course you could try encryption; but quantum computers can break most codes pretty quickly.

You say quantum computers are just theoretical? Whatever. I could write more, or PM you; but then I would have to kill you. Just kidding. I have people who do that wet work for me.

DE FACTO · Post by **DE FACTO** » Thu Feb 05, 2004 1:54 am

Hey kill me.

I want to know more.
more more more.

Borris · Post by **Borris** » Sun Feb 08, 2004 5:49 am

Apparently badger's web site and company that makes those jammers are just round the corner from my house (less then a mile).

so orders are open.

Apollonaris Zeus · Post by **Apollonaris Zeus** » Thu Feb 12, 2004 12:13 pm

they are illegal in this country.

I wouldn't want you to get in trouble on your next visit.

We want you here at BM and not in jail, though you're luckly to have the freedom in your country to use one. Sadly we can not.

A II Z

manowar · Post by **manowar** » Thu Mar 11, 2004 12:38 am

genghis wrote:don't a lot of movie theaters and hospitals have the cdma jammers installed?

Almost all casinos have them to prevent cheating. Next time you're in Vega check your phone as you walk on to the floor.
As for the legality of jamming, FCC regs state that a device must: 1. not interfere with another device. 2. A device must accept/handle any iterferance from another device (they're printed on most things, computers, microwaves ect. just look around your house). So how come casios can jam? Well the courts say that you own your property and anything sent onto your property, including airwaves. So if you own the property you can generate any signal you want, provided that it not propigate reasonably far beyond your property. I used to run the college radio station, we didn't have an FCC license so we'd broadcast on campus no problem, just had to keep it low so it didn't interfer with other stations more than 1/4 mile away from campus.
As for jamming (I'm an electrical engineer) here's a few hints. Cell phones and GPS were designed to be very resilient to jamming/interferance. A fariday cage doesn't work well because that's basically what any commercial building or car really is. The signals have all sorts of features that allow the phones to work around them. You'd need something along the lines of 1/4" steel before it becomes noticable. Try something simple, like unplugging the fuse or unscrewing the antena. You could also try lowering the temperature of the device with dry ice. That would probably alter the RC constants enough to throw it out of band. Of course that's only a short term solution. I'm not really sure what situation we're talking about here. I work better with specifics.

III · Post by **III** » Thu Mar 11, 2004 8:41 am

jamming a signal involves overpowering iwith another, contentless signal. there a currently 3 major technologies for cell phones - analog, gsm, and cdma. the analog uses a narrow frequency range, and is therefore susceptible to to just a strong noise signal broadcats on that frequency. gsm and cdma both cover a broad band of frequencies, and cdma is intentionally designed to work properly in a anoisy environment. both of them are, however, very timing sensitive, and require the base station to create a synchronization "channel" which may be spoofed, bringing everything else down.

doing that is not trivial, though. you'd probably want to start of with the base station chipsets anyways, and write your own front end for them.

robotland · Post by **robotland** » Thu Mar 11, 2004 9:20 am

"I suggest heating the water until it becomes magnetic, and then reversing polarity." -scientific advice from a really bad movie that I saw years ago, forgot the name of, but still can't get this stupid non sequitor out of my head....

AuldAne · Post by **AuldAne** » Sun Mar 14, 2004 10:20 am

"I suggest heating the water until it becomes magnetic, and then reversing polarity."

That's awesome. I want it on a t-shirt.

Rob the Wop · Post by **Rob the Wop** » Sun Mar 14, 2004 11:00 am

manowar wrote: A fariday cage doesn't work well because that's basically what any commercial building or car really is.

Nope. There is a HUGE difference between a Faraday cage and a building or car. We do radiated and conducted emmisions validation on our network board and LOM (LAN on motherboard) designs. Normally we send it out to facility to test in its 20 meter semi-anechoic chamber, but since this costs quite a bit- we decided to create a Farady cage in our lab to do preliminary, simple emissions testing.

If you have ANY holes above a certain size (you can use a fairly fine copper mesh), it fails. If the door doesn't fit EXACTLY so, it fails. The glass windows on a car or building negate the sheilding ability of the cage. Otherwise, you would NEVER get an outside signal.

manowar · Post by **manowar** » Mon Mar 15, 2004 1:51 pm

Rob the Wop wrote: There is a HUGE difference between a Faraday cage and a building or car.... If you have ANY holes above a certain size (you can use a fairly fine copper mesh), it fails. If the door doesn't fit EXACTLY so, it fails. The glass windows on a car or building negate the sheilding ability of the cage. Otherwise, you would NEVER get an outside signal.

Thanks, that's the point I was trying to make, expressed very well. There is a hugh difference. If you do happen to have access to an actual Faraday cage at a University or RF test lab or something, it should perform per textbook specs. Do not expect a "Faraday cage" you built in your garage by wrapping aluminum foil or something around an object to do much good. Yup, that means those tinfoil hats really arn't doing you any good either. The satalites can read your mind right through them.

theCryptofishist · Post by **theCryptofishist** » Mon Mar 15, 2004 3:14 pm

manowar wrote:Yup, that means those tinfoil hats really arn't doing you any good either. The satalites can read your mind right through them.

Lies, lies, LIES!!!!
You and Rob the Wop and all the rest of you are trying to make me take off my main protection! You're all against me; it's a conspiricy. Then once I take it off, you'll implant new thoughts in my head.

Well I'M NOT GOING TO OBEY.

<leaves to wrap 3 more layers of tin foil around head>

Zulegoona · Post by **Zulegoona** » Mon Mar 15, 2004 7:12 pm

Lies, lies, LIES!!!!
You and Rob the Wop and all the rest of you are trying to make me take off my main protection! You're all against me; it's a conspiricy. Then once I take it off, you'll implant new thoughts in my head.

Well I'M NOT GOING TO OBEY.

<leaves to wrap 3 more layers of tin foil around head>

theCrytofishist

It's ...It's not helping anymore.... that dental work you had a while back... that's how they are doing it. just try chewing on some aluminum foil that will prove it.....

DVD Burner · Post by **DVD Burner** » Sun Apr 11, 2004 2:07 pm

http://www.cellular.co.za/news_2003/081 ... jammer.htm

Last Real Burner · Post by **Last Real Burner** » Tue Jun 29, 2004 8:16 pm

"Si"

digitally,
mr smith

cowboyangel · Post by **cowboyangel** » Tue Jun 29, 2004 8:20 pm

DangerMouse wrote:Jamming of GPS is pretty difficult from what I understand. Plus you'll also run the potential of messing up another person's nav equipment.

Maybe a tinfoil hat will work. It'd probably be easier to suppress the antennae on the GPS unit.

i believe gps needs a clear sightong of the birds...block the unit...no tracking

cowboyangel · Post by **cowboyangel** » Tue Jun 29, 2004 8:30 pm

also has anyone heard of Willhelm Reich's cloud busters? that might work too. Rob, I'm impressed ...do you know anything about radiation and half life of radioactive substances.....I may be traveling to Chernobyl within a year, I have some ideas....

Apollonaris Zeus · Post by **Apollonaris Zeus** » Tue Jun 29, 2004 9:42 pm

cowboyangel wrote:also has anyone heard of Willhelm Reich's cloud busters? that might work too. Rob, I'm impressed ...do you know anything about radiation and half life of radioactive substances.....I may be traveling to Chernobyl within a year, I have some ideas....

What do you know about cloud busters sounds interesting?

Other then making sure you are taking enough iodine, don't drink or eat anything produced there!

A II Z

cowboyangel · Post by **cowboyangel** » Tue Jun 29, 2004 9:48 pm

well...they work for some....I know the chief archivist of Reich writtings
you can change the weather with them, probably can't change a republican's mind......

How can you jam a GPS device and cell phones!

Re: Jamming GPS

Re: Jamming GPS

Re: Jamming GPS

Ok, Ok...

Wow...

Re: Ok, Ok...

Sorry Boris, but...

Is this thing on?......