Jammer Circuits

  

This List contains Radio jamming circuits, which is the (usually deliberate) transmission of radio signals that disrupt communications by decreasing the signal to noise ratio. Unintentional jamming occurs when an operator transmits on a busy frequency without first checking whether it is in use, or without being able to hear stations using the frequency.

Another form of unintentional jamming occurs when equipment accidentally radiates a signal, such as a cable TV plant that accidentally emits on an aircraft emergency frequency. The concept can be used in wireless data networks to disrupt information flow. It is a common form of censorship in totalitarian countries, in order to prevent foreign radio stations in border areas from reaching the country.
Radar jamming and deception is the intentional emission of radio frequency signals to interfere with the operation of a radar by saturating its receiver with noise or false information. There are two types of radar jamming: Mechanical and Electronic jamming. As with other radio jamming, cell phone jammers block cell phone use by sending out radio waves along the same frequencies that cellular phones use. This causes enough interference with the communication between cell phones and towers to render the phones unusable. On most retail phones, the network would simply appear out of range. Most cell phones use different bands to send and receive communications from towers (called frequency division duplexing, FDD). Jammers can work by either disrupting phone to tower frequencies or tower to phone frequencies. Smaller handheld models block all bands from 800MHz to 1900MHz within a 30-foot range (9 meters).  Those circuits are for educational and experimental reasons only. Use wisely those circuits, because it is illegal to operate jamming devices.

 

 

News

Russia Plans to Turn Cell Phone Towers Into Cruise Missile Jammers

The National Interest Online (blog) Russia Plans to Turn Cell Phone Towers Into Cruise Missile Jammers The National Interest Online (blog) Russia mounting jammers on cell towers is unusual, but the underlying...

Oct 16, 2016

Judge sets $10K bail for man accused of jamming calls on Red Line

CNET Judge sets $10K bail for man accused of jamming calls on Red Line Chicago Tribune And he confronted Nicholl as he got off the train, telling him, "Hey dude, nice jammer ," Raida said. "He kind of...

Mar 9, 2016

CTA commuter placed in diversion program for using cellphone jammer

Chicago Tribune CTA commuter placed in diversion program for using cellphone jammer Chicago Tribune A CTA commuter who briefly became something of a folk hero when he illegally used a cellphone jammer on the Red...

Mar 31, 2016

Chicago man busted for creating quiet area using cell jammer on public train

Geek Chicago man busted for creating quiet area using cell jammer on public train Geek That made for unpleasant train rides for Nicholl, who one day decided enough was enough and bought himself a portable cell...

Apr 11, 2016

Cellphone Bombs: The New American Terror

Daily Beast Cellphone Bombs: The New American Terror Daily Beast “Jamming technology generally does not discriminate between desirable and undesirable communications” is how the Federal Communications Commission put it...

Sep 20, 2016

4 Places That Need Cell Phone Jammers

PC Magazine 4 Places That Need Cell Phone Jammers PC Magazine The Federal Communications Commission says "use of ' cell jammers ' or similar devices designed to intentionally block, jam, or interfere...

Jun 8, 2015

Navy strikes deal for backpack anti-IED jammers

Defense Systems Navy strikes deal for backpack anti-IED jammers Defense Systems The Naval Surface Warfare Center at Indian Head, Md., recently announced a $29.4 million contract modification for back-packable...

Mar 15, 2016

Beam Battles: The Return of Great Power Electronic Warfare

The National Interest Online (blog) Beam Battles: The Return of Great Power Electronic Warfare The National Interest Online (blog) Since the end of the Cold War and the onset of the War on Terror, the principal...

Mar 2, 2016

Electronic Weapons: The Antidote For GPS Jamming

Electronic Weapons: The Antidote For GPS Jamming Strategy Page This system was special because individual Pole 21 units can be mounted on existing cell phone towers (or alone on portable towers). Each Pole 21 unit can...

Sep 21, 2016

Developed In Iraq, Deployed At the DNC?: Cell-Jamming Technology Is Being Turned On Journalists

Mintpress News (blog) Developed In Iraq, Deployed At the DNC?: Cell -Jamming Technology Is Being Turned On Journalists Mintpress News (blog) Both citizen journalists and mainstream media reporters found they...

Aug 11, 2016

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