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

Devices could make motorist hang up and drive

Devices could make motorist hang up and drive The Detroit News Frustrated by this, a group of amateur radio experts around the U.S. wondered if the same efforts used to intercept Scud missiles could help reduce cell...

Dec 29, 2016

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

GPS Under Attack as Crooks, Rogue Workers Wage Electronic War ...

NBCNews.com GPS Under Attack as Crooks, Rogue Workers Wage Electronic War ... NBCNews.com Once the province of hostile nations, electronic warfare has arrived with little fanfare on U.S. highways and byways. Criminals,...

Aug 8, 2016

Cellphone Bombs: The New American Terror

Daily Beast Cellphone Bombs: The New American Terror - The Daily Beast Daily Beast It's not hard to convert a cellphone into a remote trigger. What's hard—and usually illegal—is jamming cell signals without...

Sep 20, 2016

Next Big Future: Russia will place GPS jammers on 250,000 ...

Next Big Future Next Big Future: Russia will place GPS jammers on 250,000 ... Next Big Future Russia is betting on disrupting a missile's receiver just enough to stop a direct hit. “The transmission of an...

Oct 18, 2016

Man arrested for allegedly using cell phone jammer on train

CNET Man arrested for allegedly using cell phone jammer on train CNET So, as CBS Chicago reports, 63-year-old Dennis Nicholl allegedly purchased a cell phone jammer and achieved his desired effect. The only...

Mar 10, 2016

CTA commuter placed in diversion program for using cellphone ...

Chicago Tribune CTA commuter placed in diversion program for using cellphone ... Chicago Tribune Dennis Nicholl made national headlines after his arrest following an undercover investigation by Chicago police and...

Mar 31, 2016

4 Places That Need Cell Phone Jammers

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 with authorized...

Jun 8, 2015

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

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

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