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Author Topic: Cell Phone Jammer Jeremy Weigel Phenomenal Film Handler Posts: 1062 From: Edmond, OK, USA Registered: Mar 2007 posted 06-13-2007 12:07 AM                     Came across these schematics for building your own cell jammers if anybody wants to give it try. http://www.cs.utah.edu/~chrisb/writing/jammer/circuit%20drawings/celljam5.pdf  |  IP: Logged Scott Norwood Film God Posts: 8146 From: Boston, MA. USA (1774.21 miles northeast of Dallas) Registered: Jun 99 posted 06-13-2007 07:02 AM                        ...not FCC approved and not legal in the US...  |  IP: Logged Mark Gulbrandsen Resident Trollmaster Posts: 16657 From: Music City Registered: Jun 99 posted 06-13-2007 07:46 AM                     Looking at the URL it appears to be the handiwork of someone at the University Of Utah. Illegal and if you happen to jam a doctors calls and something bad happens as a result . If you go into his site and read "Building The Cell Phone Jammer" he mentins the local electronics pacce I frequent... Ra-Elco. http://www.cs.utah.edu/~chrisb/writing/jammer/construction.htm Mark  |  IP: Logged Louis Bornwasser Film God Posts: 4441 From: prospect ky usa Registered: Mar 2005 posted 06-13-2007 08:02 AM                        Illegal ONLY IN US. Legal in Canada and elsewhere. In the USA, passive jamming (shielding) is legal and has been discussed here before. (Faraday screening). It is possible that no one may know the difference in the real world. Louis  |  IP: Logged Mitchell Dvoskin Phenomenal Film Handler Posts: 1869 From: West Milford, NJ, USA Registered: Jan 2001 posted 06-13-2007 08:46 AM                     Or you could buy one already built from England. The funny thing is they can't sell them in England, but I'm told by the person who gave me this link that they will happily ship them to the USA.  |  IP: Logged Paul Mayer Oh get out of it Melvin, before it pulls you under! Posts: 3836 From: Albuquerque, NM Registered: Feb 2000 posted 06-13-2007 12:11 PM                        Even though the FCC says they're illegal at least one casino here uses jammers inside the casino cage area - no calls to or from cell phones while in the cage. Nevada law also prohibits cell phone use within any sports book betting area or lounge. But rather than use jammers in such a public space, that law is strictly and immediately enforced by each gaming licensee's security staff. Violators are politely asked to cool it - if they don't it's fun to watch the consequent "bum's rush" treatment. I like the idea of a private property owner being able to use a jammer to enforce public-access areas on that property where cell phones cannot be used (like inside theaters or airliners). If someone thinks it's so necessary to have their cell, they shouldn't be in that area. That's what off days or hours are for. Period.  |  IP: Logged Mark J. Marshall Film God Posts: 3188 From: New Castle, DE, USA Registered: Aug 2002 posted 06-13-2007 12:42 PM                    Amen, Paul. I like the personal cell phone jammers that look like cell phones.  |  IP: Logged Mike Blakesley Film God Posts: 12767 From: Forsyth, Montana Registered: Jun 99 posted 06-13-2007 01:00 PM                        I don't understand why it should be illegal to use one of these things if the business owner puts up a nice sign saying, "Your cell phone may not work in this building." If the all important people are given this advance warning, then why should there be a problem?  |  IP: Logged David Stambaugh Film God Posts: 4021 From: Eugene, Oregon Registered: Jan 2002 posted 06-13-2007 01:10 PM                        Do the frequencies used by cell phones maybe overlap with (or are close to) those used by essential public services like police & fire?  |  IP: Logged Jack Ondracek Film God Posts: 2348 From: Port Orchard, WA, USA Registered: Oct 2002 posted 06-13-2007 02:08 PM                        quote: Mike Blakesley I don't understand why it should be illegal to use one of these things I'm with you on that. But I think it has to do more with political pressure from the cell phone industry and the sheer weight of monitoring regulations than anything else. There's always the possibility that jamming signals might find their way out of your building (the cell signals make their way IN, after all). That might be a problem for neighboring homes and businesses, and someone would have to come out to check. With the FCC having dialed back their enforcement divisions, that could be a real problem. Much easier to just disallow the whole thing. Louis is right, though. Passive jamming IS legal, and I doubt a doctor could have much to say about that.  |  IP: Logged Louis Bornwasser Film God Posts: 4441 From: prospect ky usa Registered: Mar 2005 posted 06-13-2007 02:21 PM                        If I owned a multi screen theatre, I would passive jam as much as I could and then use a very low power jammer INSIDE the shield. This would keep the jammer "IN" and the cell phone signal "OUT." If asked, I would just say that cell phones "never worked in here, even during construction." Louis  |  IP: Logged Stephen Furley Film God Posts: 3059 From: Coulsdon, Croydon, England Registered: May 2002 posted 06-13-2007 02:38 PM                     quote: David Stambaugh Do the frequencies used by cell phones maybe overlap with (or are close to) those used by essential public services like police & fire? In the US mobile 'phones use frequencies in bands at around 1900MHz. and 850MHz., with 1900MHz. being by far the most common. (Over here we use 900MHz. and 1800MHZ., which is why tri-band or quad-band 'phones are needed if you want to use them in both places. I think cordless 'phones are in the 2.4GHz. band, the same as 802.11b and g wireless networks. 802.11a is 5GHz. I've no idea what police and fire use over there, but I'm somebody else will.  |  IP: Logged Frank Angel Film God Posts: 5305 From: Brooklyn NY USA Registered: Dec 1999 posted 06-13-2007 04:31 PM                        Given that cell phones don't naturally work in many MANY places, no one is guaranteed, nor should they have an expectation that they will be able to use their cells wherever they go, especially deep inside big buildings. I am all for the FCC dropping that stupid rule. Yah, I know, I know, there is an organizational culture in the FCC around the word "jamming;" just say the word and it automatically makes mucus shoot out of their noses. Just like there is a corporate culture in the studios that makes them have mini strokes when you mention DVD burning or worse, Public Domain. The FCC should just get over themselves and understand that American citizens also have a certain culture around being able to control what goes on in their own property without the government intruding with heavy handed regulations. Besides, I think a doctor who has patients on the verge of death shouldn't be relying on very ify cellphone technology in the first place. In fact, he shoudn't even be peddling his ass out around town if things are so critical at the hospital. Would any of us buy the excuse, "Gee, sorry, but your loved one didn't make it because, well, I was out of cellphone range." What did doctors do before there were cell phones? Well, they will just have to do it again in my theatre....and in the subway....and in airplanes....and even in their own hospitals! Relying on cell phones for emergency situations? Do so at your own risk.  |  IP: Logged Daryl C. W. O'Shea Film God Posts: 3977 From: Midland Ontario Canada (where Panavision & IMAX lenses come from) Registered: Jun 2002 posted 06-13-2007 05:36 PM                        quote: Frank Angel The FCC should just get over themselves and understand that American citizens also have a certain culture around being able to control what goes on in their own property without the government intruding with heavy handed regulations. Yeah but how many of those citizens, regardless of nationality, have the intelligence or the know how to contain RF jamming to their own property? How many that do would get kicks out of exceeding that limit and going "oops, sorry, didn't *really* mean to jam the entire town"?  |  IP: Logged Jack Ondracek Film God Posts: 2348 From: Port Orchard, WA, USA Registered: Oct 2002 posted 06-13-2007 08:14 PM                        ... and so here we are!  |  IP: Logged

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