Covert Mobile Phone Jammer
(34 votes, average: 3.53 out of 5)
Sticking with the mobile phone theme, here’s a cellular phone (or mobile phone) radio signal jammer, designed to knock out phones in a 15 metre radius. The unit features a rechargeable battery and will run for 90 minutes on a single charge.
The jammer has 3 aerials to match the 3 frequency bands it’s designed to block out. If an aerial does not match the wavelength (and thus frequency) of the transmitted radio signal, then the strength of the signal can be severely limited. Therefore to maximise the output of the device, the jammer has an aerial length that matches the average frequency of the major frequency bands.
The jammer is intended to block out the following frequencies:
- 851 - 960Mhz
- 1805 - 1990Mhz.
- 2100 - 2170Mhz
However, if you look at the commonly used frequencies on the GSM frequency band allocation:
- GSM900 -> 880 - 915 MHz paired with 925 - 960 MHz
- GSM1800 -> 1710 - 1785 MHz paired with 1805 - 1880 MHz
- GSM1900 -> 1850 - 1910 MHz paired with 1930 - 1990 MHz
GSM900 and GSM1800 are typically used in Europe, and GSM1900 is typically used in the US. You’ll notice that GSM1800 is not completely knocked out. The 1st set of frequencies on GSM1800 do not fall within the specified range on the jammer. However, GSM900 and GSM1900 are completely covered by the jammer. I wonder if the jammer does completely knock out service providers using GSM1800?
However, it’s illegal to own and use a frequency jammer in Europe, and some parts of the US too I imagine. You’ll notice that Spy Catcher will not sell a jammer to anyone in Europe. Considering they are based in the UK, I wonder if they stock the devices in the UK. Remember, it’s illegal to own one!
April 13th, 2007 at 7:15 pm
Here they talk about a cool one:
radius 50km!!!
http://gizmodo.com/gadgets/rj_g1575/
April 15th, 2007 at 7:12 pm
50km? Yeah right… for such a small device I doubt it will manage 5km!
April 18th, 2007 at 7:59 am
Who cares about 5km radius? This claims to work within a few feet or more, and would be just fine with me: http://www.techgadgetz.com/cjama.htm. It is also small, portable, and rechargeable…… Plus, I think it isn’t illegal to own these, just to use them in certain places.
April 18th, 2007 at 9:54 am
Definitely illegal to own. Just harder to detect
May 15th, 2007 at 9:07 am
I bought a cell phone jammer from http://www.infostream.biz
fantastic gadget!!! I carry it with me to cinema, restaurant and on the train, I enjoy it so much.
May 30th, 2007 at 6:33 pm
Looks like an advertising post there…. but it is relevant, so I’ll leave it.
August 2nd, 2007 at 6:43 pm
I am looking for something cheap and that will stop other people from useing any spy equipment near me
August 3rd, 2007 at 9:14 am
It’s almost impossible to get something that will stop all spy devices unless you end up living in a box. If you’re really concerned, you should probably speak to a counter-surveillance agency to sweep your home and workplace.
August 11th, 2007 at 8:54 am
It’s illegal to own one in the UK.
November 26th, 2007 at 2:49 pm
Technically, it should block GSM 1800. GSM and UMTS use paired frequency bands; one band is for phone to base station communication, and the other is for base station to phone communication. So long as you block one band in the pair, the phone will stop working (it needs two-way communications to function, not one-way).
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