DX Cell Phone Blockers

[HIMNL9]

Anyone have experience with GPS jammers?

Not directly, but DX have a relatively cheap one in list, too .....

 

[Toke]

What else would you use these for Johny?

I could imagine bringing one to the cinema or in the quiet section seats on the train.

And yes, as have been explained it is interfering with other peoples legal radio devices and is something the mail and telegraphic service will take a dim view to.

 

[JLSE]

Interrupting a paid service , one should be cautious and not too obvious..

The DX jammers are only good for the older services and will NOT work for 3 or 4g services.
Blackberries are out, and any other freq. over 2100mhz.

These units are easily tuned with a 20$ frequency counter off ebay. You also need access to the 3 bands (friends phones) to dial in. The ones I tuned were for CDMA GSM etc, but for some reason still needed to fine tuned on victim phones..

The smaller ones work well when tuned properly, out of the box will jam your wifi at best. But id say they are quite effective when standing within 15ft of someone yacking on their phone..

Also search 'wavebubble' on google, there is a good DIY project as well, though I have not attempted that one.

 

[ossumguywill]

Also search 'wavebubble' on google, there is a good DIY project as well, though I have not attempted that one.

Someone mentioned that, it's a real pain to do all the surface mount soldering IMO... also, I have this little wifi jammer, it's the transmitter for a mini security camera (I discovered it jammed wifi by accident). I de-soldered the camera part, and you can run it off a few AAA batteries or USB. It's a lot of fun to use sometimes, and depending on how I shape the antenna it's a lot more effective than I expect. Sometimes I get ranges in excess of 50 feet, I haven't tested any further than this.

 

[JLSE]

Someone mentioned that, it's a real pain to do all the surface mount soldering IMO... also, I have this little wifi jammer, it's the transmitter for a mini security camera (I discovered it jammed wifi by accident). I de-soldered the camera part, and you can run it off a few AAA batteries or USB. It's a lot of fun to use sometimes, and depending on how I shape the antenna it's a lot more effective than I expect. Sometimes I get ranges in excess of 50 feet, I haven't tested any further than this.

My wifi used to get jammed everytime id warm something up in the microwave..

The thing to remember with these jamming devices, is they put out massive amounts of noise on frequencies similar to that which we warm up food.

wifi and any other device spewing 2.4g cant be good over time...

A microwave oven cooks at 2.45ghz, this freq resonates well with the water
and enables the bi product of heat.

These jammers seen on DX, mainly the larger ones good for 300ft or so, should be used with caution. Foil underwear is strongly recommended :tinfoil:

The larger jammer on DX actually caused the processor in my PC some confusion.
I had plugged it in, straight out of the box, and my computer started making that sound you get when a file is finished downloading in internet explorer.

That was the waves actually passing through the case of the PC and affecting the operation of the processor...

For anyone considering use of one of these devices, I would say, get yourself a low cost freq counter with the field strength meter. At least this way you can monitor the amount of noise you are being exposed to, and at what range.

These 'jammers' put out much more than what a cell phone, wifi, or any other FCC regulated product does.

Its not a matter of interference, but what you are being exposed to with the use of one.

 

[ossumguywill]

My wifi used to get jammed everytime id warm something up in the microwave..

The thing to remember with these jamming devices, is they put out massive amounts of noise on frequencies similar to that which we warm up food.

wifi and any other device spewing 2.4g cant be good over time...

A microwave oven cooks at 2.45ghz, this freq resonates well with the water
and enables the bi product of heat.

These jammers seen on DX, mainly the larger ones good for 300ft or so, should be used with caution. Foil underwear is strongly recommended :tinfoil:

The larger jammer on DX actually caused the processor in my PC some confusion.
I had plugged it in, straight out of the box, and my computer started making that sound you get when a file is finished downloading in internet explorer.

That was the waves actually passing through the case of the PC and affecting the operation of the processor...

For anyone considering use of one of these devices, I would say, get yourself a low cost freq counter with the field strength meter. At least this way you can monitor the amount of noise you are being exposed to, and at what range.

These 'jammers' put out much more than what a cell phone, wifi, or any other FCC regulated product does.

Its not a matter of interference, but what you are being exposed to with the use of one.

Your microwave is probably not up to regulation-the leakage has to be in the order of mW IIRC. That's a problem... Also, wireless devices tend to stay away from the resonant frequency of water if they can. Maybe these DX jammers are dirty enough to stray in to the resonant frequency of water, but I doubt it. And as for the jammer messing with your PC, there's no way messing with the processor was doing that. If the processor got messed up, you would get a kernel panic (BSOD). There's no reason it would play a sound, that takes a very specific piece of code being executed. My guess is it was messing with your speakers and you were hearing the thing cycle through different frequencies. I was once parked near some kind of weather or ham radio antenna. The speakers were making whining noises, and my guess is that the op-amps inside the car were picking up this RF, or a lower harmonic of this RF.

 

[JLSE]

Your microwave is probably not up to regulation-the leakage has to be in the order of mW IIRC. That's a problem... Also, wireless devices tend to stay away from the resonant frequency of water if they can. Maybe these DX jammers are dirty enough to stray in to the resonant frequency of water, but I doubt it. And as for the jammer messing with your PC, there's no way messing with the processor was doing that. If the processor got messed up, you would get a kernel panic (BSOD). There's no reason it would play a sound, that takes a very specific piece of code being executed. My guess is it was messing with your speakers and you were hearing the thing cycle through different frequencies. I was once parked near some kind of weather or ham radio antenna. The speakers were making whining noises, and my guess is that the op-amps inside the car were picking up this RF, or a lower harmonic of this RF.

It was the chime for a download and it repeated itself about 3 times IIRC. I was in close proximity to the PC, maybe 5ft with a jammer that ranges 300+ft...

If you purchase the larger 80$ wall mount jammer from DX, try this for yourself, though I will not be responsible if damage occurs..

It didnt seem to cause any permanent issues. Just acting up when close by..

I know the sound well, and am 100% that was it.


The microwave and the wifi thing happened when I was living in an appartment, and surrounded by concrete. Not sure if the layout played any part, but the microwave was in the kitchen and the wifi in the dining room in the corner. The microwave was new and undamaged, but it would happen every single time.

Not sure if it happens in the house, as I hardwired everything, and use the wifi rarely.

 

[ossumguywill]

Like I said, there is no way that the jammer directly interfered with the processor to cause that noise. I mean, while it's technically possible, the chances that the jammer caused the CPU to perform a few thousand erroneous calculations by accident are so low they're not worth considering. It's possible the jammer interacted with the computer some other way, but messing with the CPU would cause much larger problems... I'll have to try that though, I'm interested what could have happened.

 

[boscoj]

yup this one sucks DealExtreme: $28.79 20dBm-Output Portable GSM/CDMA/3G/DCS/CDMA1900 Cell Phone Signal Jammer/Blocker

but the gaylic peeler works great . . .

Has anyone bought or used one of the DX Cell Phone Blockers? I know they are illegal in the US but I think DX still ships them here. They seem pretty crappy but maybe they can be tweaked to use at longer distances. I might just try to but one since they are under $30. Thanks.

DealExtreme Search: cell phone blocker

 

[JLSE]

Like I said, there is no way that the jammer directly interfered with the processor to cause that noise. I mean, while it's technically possible, the chances that the jammer caused the CPU to perform a few thousand erroneous calculations by accident are so low they're not worth considering. It's possible the jammer interacted with the computer some other way, but messing with the CPU would cause much larger problems... I'll have to try that though, I'm interested what could have happened.

Ill agree with you there, my guess was the CPU, but then again just a guess.
It freaked me out when it repeated.

The PC it happened to is my 'TV' PC with all the movies and the backup
hard drive. I wouldn't risk that one twice... you just never know.

It never happened when I was testing the smaller jammers, only the big one.
I bought 2 of them and tested the second one far away from anything sensitive

 

[Cyparagon]

A microwave oven cooks at 2.45ghz, this freq resonates well with the water
and enables the bi product of heat.

So if an oven's by-product is heat, what is the product? :thinking:

 

[JLSE]

So if an oven's by-product is heat, what is the product? :thinking:

Smart ass :na:

 

[Coherent Light]

Really You get a Smart Ass from a Microwave,,,,,Wow didn't know where the hell They came from good to know....

 

[HIMNL9]

So if an oven's by-product is heat, what is the product? :thinking:

Smart ass :na:

Really You get a Smart Ass from a Microwave,,,,,Wow didn't know where the hell They came from good to know....

ROTFL !!

Thanks, to all you three, i was really needing a good laugh, this morning :crackup:

 

[flecom]

So if an oven's by-product is heat, what is the product? :thinking:

lots of RF :na:

 

[LazyBeam]

I haven't logged in here in awhile but I was searching cell phone jammers and an LPF discussion happened to come up. :yh: Interesting thread/discussion and I thought I'd share an idea about passively boosing signals. Well, not so much "passive" as using a directional anetenna.

Back in the late 90's when wifi was really gaining traction in public the businesses/people weren't wise yet to use WEP/password protection. This was mainly because not many people had wireless so there was little risk of others invading your network. I was also too cheap to pay for my own internet and wireless so I constructed a directional antenna.

You see, a regular "stick" antenna often outputs a sherical or torroidal broadcast pattern - often called "omnidirectional" meaning 360 degree coverage. But if you take all of that spread enery and directoinalize it with a special antenna shape, your gain factor goes up (wherever it's pointed) and you can really get some serious distance with simple devices. Kind of like how light travelling from a light bulb decreases with the square of the distance traveled versus a laser pointer of much less output being able to deliver power much further. A directional antenna, for lack of a better illustration, "collimates" the broadcast signal.

So using a few VERY simple/cheap household and radioshack items, I constructed a directional antenna about 100mm x 250mm in size (pretty small). I then partially dissassembled my laptop comuter to disconnect the internal 802.11b antenna and wired my homemade antenna directly into the wireless card. Remember, my antenna used NO amplification or external power. I was able to aim the antenna at known wifi spots about 1/2km away and surf the internet for free. It was directional, so as long as I kept it pointed at a line-of-sight source it was good. I eventually used a camera tripod and sat in my back yard surfing the internet - I probably looked pretty weird, lol. My antenna could even be used as the reciever head on a sattelite/directTV dish to increase the range even more. All satelite dishes do is redirect a large area of space parabolically to a reciever head (it's like a magnifying lens for radio signals).

I am 100% confident such a method could be used for these cheap DX (or any) transmitters so long as the directional antenna dimensions are suited to the wavelenths desired. If you want to disrupt signals at longer distances (and you have a specific target in mind) any cheap jammer that operates on that frequency can do it with a directional antenna. :angel: