what is triband mobile?

[kunwar]

thanks for those who tell the answer of this questain .

 

[Nemesis]

well u c, cell phones operate on frequencies such as 850MHz, 900MHz, 1800MHz, and 1900MHz. so if ur phone is capable of running on any 3 frequencies out of the 4 i listed, it is called a triband mobile...for example, if ur cell phone has 900, 1800, and 1900 then it will b called a triband mobile...

 

[hikapil]

Cell phones operate on frequencies such as 850MHz, 900MHz, 1800MHz, and 1900MHz.

You are wrong at frequencies. I think the correct frequencies are 800, 900 and 1800 so:

A network infrastructure or wireless phone designed to operate in three frequency bands: 800 MHz, 900 MHz and 1800MHz.

 

[sr_ultimate]

Cell phones operate on frequencies such as 850MHz, 900MHz, 1800MHz, and 1900MHz.

You are wrong at frequencies. I think the correct frequencies are 800, 900 and 1800 so:

A network infrastructure or wireless phone designed to operate in three frequency bands: 800 MHz, 900 MHz and 1800MHz.

I think you both are right
the frequencies depend on the phone and the place you are in

these are some phones with the frequencies matching :

Motorola V300 : GSM 850, 900, 1800, 1900
Siemens S56 : GSM 800, 1900
SE P910i :GSM 900/1800/1900

 

[techno_funky]

its just like your RADIO frequencies
you have FM AM
just like those frequencies we have the mobile frequencies
yaa mobile frequencies are lot more diffrent but
just to explain youthe comparision with the radio frquencies

 

[Darthvader]

Ya the frequencies are followed differently in different countries like us,uk and india so a tri band phone is quite handy

 

[neerajvohra]

The high power unit incorporates a metal shielded cage comprising two jamming signal generators, each connected into a 15W booster power amplifier, thereby enabling the transmission of up to 15W per frequency band. The cage is attached to a metal heat sink for heat dissipation under continuous operating conditions.


Standard units are housed within a robust Pelican case and powered by mains AC voltage (110/220). The filtered output signal is fed into directional antennas installed within the Pelican case, opposite the heat sink side. Each unit has VSWR protection that disables transmission in the event that no antenna is connected to the RF output connector or in the event that antenna transmission is obstructed by a close object.







Optional configuration may include external N-type RF connectors for the use of external antenna(s) instead of the unit's internal antennas. The output signals of different frequency bands may also be combined using a diplexer so as to enable the use of a single wideband antenna. (eg: 900/1800). Further optional configuration may include DC input operating voltage (12/24V) to allow vehicle operation. Another available option is an internal battery power unit, allowing portable operation of approximately up to 1 hour without any power source at full transmission power. Battery operated units may be recharged by either mains (110/220V) power or DC (12/24V) power, provided that the unit is in recharge mode and not transmitting. An optional trickle/fast charger enable battery recharge, while the unit is operating.

Designed for versatile use, the high power unit may be either deployed as a fixed
installation (wall or rack mounted), vehicle mounted (by using vehicle's DC power feed and external magnetic base antenna) or portable use (by using a battery operated unit).

Each unit's jamming signal generators covers a different cellular band (eg:
800/900/1800/1900) and is configured for optimum coverage of the specific standard(s) available in the respective band (eg: GSM/CDMA/TDMA). Additional frequency bands and/or cellular standard are available upon request. As third generation cellular technology (G3) is deployed, additional frequency bands will be offered. The jamming signal generators are built using PLL synthesized technology to ensure high accuracy and stability during operation. This ensures that the unit's transmitted jamming signal blocks all cellular signals without interfering with other vital wireless communications.

An optional infra-red remote control enables digital power control of each jamming signal generator up to the maximum output power, as well as other transmission parameters such as centre frequency, span & modulation characteristics. In order to disable the operation of mobile phones, the jamming signal, when received at the mobile phone's antenna, should have sufficient strength in comparison with the radio signals transmitted by the cellular network's base stations. Since the high power unit's maximum output power is fixed, the actual jamming range in any given location is a function of the signal strength of each cellular network as received by mobile phones in that location.

The signal strength is mainly a function of the distance from nearby cellular base stations. Therefore, in principle, the closer the base station, the lower the jamming range and vice versa.
Applications

Tri-Band high power has been specifically designed for the following applications:

* Coverage of prison facilities
* Military bases
* Antiterrorist squads
* Drug enforcement units
* Bomb squads
* Remotely cutting off communications in buildings
* Coverage of open spaces
* Embassies
* Government facilities
* Sensitive locations

Technical Specifications
System Overview

RF Power output.....................30W max (15w per band)
Signal source..........................PLL synthesized
Input power...........................110/220 Vac or 24 Vdc regulated
Modules per unit.....................single/dual band
Antenna.................................Internal directional antenna(s), 7dBi gain

N-Type connectors for external antennas.
External antennas not included.
Cellular Systems

Frequency bands**.................463 - 468 MHz*
851/869 - 894 MHz
925/935 - 960 MHz
1805 - 1880 MHz
1930 - 1990 MHz

Air interface standards...........Analog: AMPS, N-AMPS, NMT, TACS
Digital: GSM, CDMA, TDMA (D-AMPS), iDEN
Physical Dimensions

Size..........................................320mm (H) x 420mm (L) x 160mm (W)
Weight.....................................14 kg (dual-band) for standard configuration
Environmental
Operating temperatures............0o C to 45oC
Humidity..................................5% to 80%
Case........................................Water proof

Optional Configuration
Diplexer...................................Simple diplexed antenna output
Leaky coax...............................Radiating cable antenna
Internal battery........................2 x 3AH
Battery charger........................Trickle/fast charge
DC input power........................12/24 Vdc non-regulated input
Remote control.........................Infrared

 

[SmoothCriminal]

@neeraj: Also post the source: Source

 

[Nemesis]

as far as i know, there is no GSM800 band...USA uses GSM850 and GSM1900...

@neeraj: i wonder how useful ur information really is 2 the thread starter....

 

[babumuchhala]

GSM 850 MHz band is used only in US & Canada (If i am not wrong), where as the rest of the world uses 900 MHz.

Donno why Americans wanna do things always different frm the rest of the world.