ima li neko shemu
rusenje ili ometanje signala gsm--a,tv--a,radia i ostalo
rusenje ili ometanje signala gsm--a,tv--a,radia i ostalo
Moderators: pedja089, stojke369, [eDo], trax
Mobitele je dosta tesko omest nekim brute metodama, njih treba ometat na tocnoj frekvenciji odasiljanja ili primanja (dosta je jedno od toga).
Sta se tice analognih veza dovoljno je proizvesti što više RF šuma (iskrenje u zraku i sl) ili opet aktivno ometanje na točno određenoj frekvenciji.
Ja sam bas imo problema s minijaturnim teslinim transformatorom (elektronicki, royer oscilator) ruši mi internet vezu, radio, telefon i TV,
blokira ADSL modem i cesto moram resetirat da ga opet ozivim, tako da nemogu eksperimentirat bas puno
Mobitel u blizini izgubi tek koju crticu signala, i sve radi noramlno (proizvedeni šum spektrom slabo zahvaća 1ghz pojas) a antena mobitela je mala i dobor je oklopljen tako da je utjecaj promjenjivog el. polja minimalan.
Sta se tice analognih veza dovoljno je proizvesti što više RF šuma (iskrenje u zraku i sl) ili opet aktivno ometanje na točno određenoj frekvenciji.
Ja sam bas imo problema s minijaturnim teslinim transformatorom (elektronicki, royer oscilator) ruši mi internet vezu, radio, telefon i TV,
blokira ADSL modem i cesto moram resetirat da ga opet ozivim, tako da nemogu eksperimentirat bas puno
Mobitel u blizini izgubi tek koju crticu signala, i sve radi noramlno (proizvedeni šum spektrom slabo zahvaća 1ghz pojas) a antena mobitela je mala i dobor je oklopljen tako da je utjecaj promjenjivog el. polja minimalan.
Meni bi trebao nesto poput prijemnika (receivera) signala mobilnih telefona. Da mogu prisluskivati sta se prica preko mobilnog telefona.
Postoji li shema takvog uredjaja koji se moze napraviti u samogradnji ili se mora kupiti kakav gotov fabricki uredjaj za tu namjenu?
Molim info (eventualno i shemu i opis takvog uredjaja, ukoliko je moguce!)
Postoji li shema takvog uredjaja koji se moze napraviti u samogradnji ili se mora kupiti kakav gotov fabricki uredjaj za tu namjenu?
Molim info (eventualno i shemu i opis takvog uredjaja, ukoliko je moguce!)
Nasao sam ovo na netu: :roll
Jamminc and blocking radio signals
If you want that certain radio signal does not get to a certain place you have generally two options: shielding and jamming.There is no device that can simply "block" an RF transmission,other than by transmitting another RF transmission on the samefrequency that is overwhelmingly strong compared to the onebeing "blocked". This is called "jamming", and it is in generalillegal worldwide, because intentionally interfering with legitimate radiocommunications is illegal in virtually all countries. There are a couple of companies that manufacture cell phone blockers, but the use of those is very much limited to only few countries where use of them is allowed. The only other option is to shield the receiving device(s) from the transmission. A grounded electrically sealed metal box will keep the radio signal not from getting into it. In some cases not completely shielded or wire mesh box can attenuate the radio signals quite much (the shielding effects of such not completely closed structure depends very much on the signal frequency).For instance, cell phones in a theater could be rendered inoperative by making the theater a completed closed conductive chamber; i.e., asealed (electrically) metal
Jamminc and blocking radio signals
If you want that certain radio signal does not get to a certain place you have generally two options: shielding and jamming.There is no device that can simply "block" an RF transmission,other than by transmitting another RF transmission on the samefrequency that is overwhelmingly strong compared to the onebeing "blocked". This is called "jamming", and it is in generalillegal worldwide, because intentionally interfering with legitimate radiocommunications is illegal in virtually all countries. There are a couple of companies that manufacture cell phone blockers, but the use of those is very much limited to only few countries where use of them is allowed. The only other option is to shield the receiving device(s) from the transmission. A grounded electrically sealed metal box will keep the radio signal not from getting into it. In some cases not completely shielded or wire mesh box can attenuate the radio signals quite much (the shielding effects of such not completely closed structure depends very much on the signal frequency).For instance, cell phones in a theater could be rendered inoperative by making the theater a completed closed conductive chamber; i.e., asealed (electrically) metal
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- Posts: 15
- Joined: 04-02-2005, 10:42
I mene je to zanimalo. Cackao sam po drugim forumima, i nasao otprilike da se ranije, kod analognog signala moglo relativno lako prisluskivati.zicar wrote:Meni bi trebao nesto poput prijemnika (receivera) signala mobilnih telefona. Da mogu prisluskivati sta se prica preko mobilnog telefona.
Postoji li shema takvog uredjaja koji se moze napraviti u samogradnji ili se mora kupiti kakav gotov fabricki uredjaj za tu namjenu?
Molim info (eventualno i shemu i opis takvog uredjaja, ukoliko je moguce!)
Kod digitalnog signala, t.j. danasnjih mobitela, nije problem ako se ima gotov uredjaj, a njegova cijena je reda velicine nekoliko 100xk €. Uz to, proizvodjac prodaje takve igracke samo ovlastenim korisnicima ( citaj, kriposi i tajne policije ).
Prije koju godinu, kriminalisticka policija jedne manje ali bogate evropske zemlje je trazila vanredno izdvajanje iz budjeta za takvu igracku koja bi imala kapacitet da prati nekih 200 mobitel brojeva. Trazeni iznos je bio cca. 1,3 miliJona €.
Sistem koji se aktivira prepoznavanjem karakteristicnih rijeci kosta cca. 80 M$.
Zakljucak: Ostaju nam bube i stara, dobra zica, a za ambicijoznije i prisluskivanje bezicnih ( analognih ) telefona. Daj sta das.
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- Pravo uznapredovao :)
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- Location: Hrvatska