RF Distruptor

mystic_granny · 22nd October 2006, 12:39 AM

This is probably the best place for a post like this, im currently undertaking a design project, and i was wondering about the possibilty of a device that creates so much interfereance it would make mobile devices such as mobile phones, anything bluetooth based.. cordless phones.. wireless networks.. etc completely unusable

If anyone has any knowledge on the subject i would much appreciate asking you a few questions

digamma · 22nd October 2006, 3:04 PM

My knowledge of this is only very basic, but essentially what you need to do is have a device broadcasting at the same frequency in the vicinity of the device you want to interupt. At a higher power level too is always preferable. So, yes, it is possible, but what you want to build is probably subject to regulation however. I remember hearing or reading about an electrician or electonics wizz that used a satelite dish and the magnetron from an old microwave over to direct the microwaves at devices and fry they electronics. I think the purpose of him doing this was due to hoons in his neighbourhood that were constantly doof doof-ing in the street. I think that would be a more worthwhile project

mystic_granny · 22nd October 2006, 3:31 PM

sadly to use it as my Design Tech project it has to be legal

snm · 22nd October 2006, 3:41 PM

They are called Jammers and i think u'll find they are highly illegal. Unless you're an experienced RF Engineer or EW Expert don't waste your time cos u haven't got a hope.

nux · 22nd October 2006, 4:03 PM

I don't think theres a chance of making one that works and is legal. Maybe just build a giant faraday cage around a building.

-KoMoD0- · 22nd October 2006, 6:30 PM

What about knocking out a TV signal at close range?

Say i threw a box on to next doors roof next to their antenna, would it be possible to make something broadcast on a big freq or have something change the freq up and down very fast>?

Dr feelgood · 22nd October 2006, 7:33 PM

Had a mate once once who had two HT transformers, essentially he had 240v stepped up to 4KV then through another homebrew transformer to step it up again, (no idea how far as we had no measuring equipment for that kind of voltage range). Just getting that much power radiating from a coathanger blocked out all t.v, radio and mobile phone for 1Km. depending upon power output EM radiation will cause almost all electronics to fail.

digamma · 22nd October 2006, 8:51 PM

That's nuts, having that amount of power through a coathanger. Surprised you didn't melt it. But that would be an awesome effect though, blanking out everyone's tvs

mystic_granny · 22nd October 2006, 10:07 PM

should let it off just before they announce the winner of a tv series... like big brother.. imagine the tears

Rt! · 23rd October 2006, 12:45 PM

highly illegal

cvidler · 23rd October 2006, 1:19 PM

If you know someone in the Navy, ask to borrow the main radar off of an ANZAC class ship. It'll knock out everything for kilometers. In fact they're not allowed to be used in locations like Syndey Harbour for this very reason. They're also very hazardous to ones health if you're standing to close.

Dr feelgood · 23rd October 2006, 6:04 PM

Quote:

Originally Posted by digamma

That's nuts, having that amount of power through a coathanger. Surprised you didn't melt it. But that would be an awesome effect though, blanking out everyone's tvs

think of it more as radiating from the coathangar rather than through

Goth · 23rd October 2006, 9:41 PM

Quote:

Originally Posted by Dr feelgood

Had a mate once once who had two HT transformers, essentially he had 240v stepped up to 4KV then through another homebrew transformer to step it up again, (no idea how far as we had no measuring equipment for that kind of voltage range). Just getting that much power radiating from a coathanger blocked out all t.v, radio and mobile phone for 1Km. depending upon power output EM radiation will cause almost all electronics to fail.

What a load of crap. You wouldn't even have RF emission, without a resonant transformer /capacitor combination - a Tesla Coil kind of thing. Even if you did have RF emission, you wouldn't cover that range of frequencies.

Not even a large Tesla coil will disrupt RF communications over that scale, although limited interference, eg. static and interference to TV and telecoms, PA etc over a radius of say a few blocks can and does occur with a large enough coil.

choppa · 23rd October 2006, 10:14 PM

Quote:

Originally Posted by Goth

-snip-

Not only that, within 15-30 minutes not only will a representative of ACMA be at your location (where you let off the signal), but there will also be a squad of police cars dispatched to your location [I'm serious].

-KoMoD0- · 23rd October 2006, 10:48 PM

Lets say i got a old TV transmitter, modded it to boost signal output, wrapped a tree in enamel coated copper wire and switched it on would i be possible to knock out a small neighbourhood's CH7 TV signal with my pr0n stream and how long would the jail sentence be

22nd October 2006, 12:39 AM	#1
mystic_granny Member Join Date: Jul 2004 Location: Northern Sydney Posts: 297	RF Distruptor This is probably the best place for a post like this, im currently undertaking a design project, and i was wondering about the possibilty of a device that creates so much interfereance it would make mobile devices such as mobile phones, anything bluetooth based.. cordless phones.. wireless networks.. etc completely unusable If anyone has any knowledge on the subject i would much appreciate asking you a few questions

22nd October 2006, 3:04 PM	#2
digamma Member Join Date: Mar 2002 Location: Brisbane, Southside. Posts: 2,428	My knowledge of this is only very basic, but essentially what you need to do is have a device broadcasting at the same frequency in the vicinity of the device you want to interupt. At a higher power level too is always preferable. So, yes, it is possible, but what you want to build is probably subject to regulation however. I remember hearing or reading about an electrician or electonics wizz that used a satelite dish and the magnetron from an old microwave over to direct the microwaves at devices and fry they electronics. I think the purpose of him doing this was due to hoons in his neighbourhood that were constantly doof doof-ing in the street. I think that would be a more worthwhile project __________________ The ultimate weakness of violence is that it is a descending spiral. Returning violence with violence only multiplies violence, adding deeper darkness to a night already devoid of stars.

22nd October 2006, 3:41 PM	#4
snm Member Join Date: Jul 2005 Location: Adelaide SA Posts: 263	They are called Jammers and i think u'll find they are highly illegal. Unless you're an experienced RF Engineer or EW Expert don't waste your time cos u haven't got a hope. __________________ _____________________________________________ Intel i7-2600k -- Powercolor 2GB 6950 -- Gigabyte Z68X-UD3R -- 2x4GB G.Skill Sniper 1600 -- 3 x DELL 20.1" 2007FP's -- G15 + G9

22nd October 2006, 7:33 PM	#7
Dr feelgood Member Join Date: May 2005 Location: Mornington peninsula Posts: 1,739	Had a mate once once who had two HT transformers, essentially he had 240v stepped up to 4KV then through another homebrew transformer to step it up again, (no idea how far as we had no measuring equipment for that kind of voltage range). Just getting that much power radiating from a coathanger blocked out all t.v, radio and mobile phone for 1Km. depending upon power output EM radiation will cause almost all electronics to fail. __________________ There's always someone out there who will make me feel wiser and less arogant than I may actually be. I'd Rather Be A BASS Player Club Member #04 "It is better to sleep on what you plan to do than to be kept awake by what you've done." Rowland Croucher - Living Without Regrets

22nd October 2006, 8:51 PM	#8
digamma Member Join Date: Mar 2002 Location: Brisbane, Southside. Posts: 2,428	That's nuts, having that amount of power through a coathanger. Surprised you didn't melt it. But that would be an awesome effect though, blanking out everyone's tvs __________________ The ultimate weakness of violence is that it is a descending spiral. Returning violence with violence only multiplies violence, adding deeper darkness to a night already devoid of stars.

22nd October 2006, 3:31 PM	#3
mystic_granny Member Join Date: Jul 2004 Location: Northern Sydney Posts: 297	sadly to use it as my Design Tech project it has to be legal

22nd October 2006, 4:03 PM	#5
nux Member Join Date: Jan 2002 Location: Melbourne Posts: 16,790	I don't think theres a chance of making one that works and is legal. Maybe just build a giant faraday cage around a building.

22nd October 2006, 6:30 PM	#6
-KoMoD0- Member Join Date: Dec 2005 Location: Western Sydney Posts: 7,755	What about knocking out a TV signal at close range? Say i threw a box on to next doors roof next to their antenna, would it be possible to make something broadcast on a big freq or have something change the freq up and down very fast>?

22nd October 2006, 10:07 PM	#9
mystic_granny Member Join Date: Jul 2004 Location: Northern Sydney Posts: 297	should let it off just before they announce the winner of a tv series... like big brother.. imagine the tears

23rd October 2006, 12:45 PM	#10
Rt! Member Join Date: Jun 2001 Location: Nimbin Posts: 7,346	highly illegal __________________ dher

23rd October 2006, 1:19 PM	#11
cvidler Member Join Date: Jun 2001 Location: Canberra Posts: 7,166	If you know someone in the Navy, ask to borrow the main radar off of an ANZAC class ship. It'll knock out everything for kilometers. In fact they're not allowed to be used in locations like Syndey Harbour for this very reason. They're also very hazardous to ones health if you're standing to close. __________________ We might eviscerate your arguments, but we won't hurt you. Honest! - Lucifers Mentor ⠠⠵ [#]

23rd October 2006, 10:48 PM	#15
-KoMoD0- Member Join Date: Dec 2005 Location: Western Sydney Posts: 7,755	Lets say i got a old TV transmitter, modded it to boost signal output, wrapped a tree in enamel coated copper wire and switched it on would i be possible to knock out a small neighbourhood's CH7 TV signal with my pr0n stream and how long would the jail sentence be