Dungeon Dilettante
Posts: 1
Joined: Monday, 4th August 2014, 08:31
a useful high technology device
minute we keep cell phones in our hands. But the problem is, what to
do if we need to keep silent in some speical places? A
cell phone jammer will be the answer. Cell phone jammer is an instrument used
to prevent cellular phones from receiving and transmitting the mobile
signals to a base station. When turned on, the jammer effectively
disables cellular phones in a certain working area. Practically these
devices can be used in any location, but most of them are found in
places where a phone call would be particularly disruptive. Those
places include meeting rooms, libraries, churches, mosques, movie
theaters, and other places where silence is expected.
At the beginning, cell phone blocker was originally developed for law enforcement and the military
to interrupt communications by criminals and terrorists. Some were
also designed to foil the use of certain remotely detonated
explosives. The civilian applications were apparent, so over time many
companies originally contracted to design jammers for government use
switched over to sell these devices to private entities. Since then,
there as been a slow but steady increase in their purchase and use
especially in major metropolitan areas.
Operation 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 of cell phones and the
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. Thus
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. Small devices tend to
use the former method, while larger more expensive models may
interfere directly with the tower. The radius of cell phone jammers
can range from a dozen feet for pocket models to kilometers for more
dedicated units.
Older cell phone signal
jammer sometimes was limited to working on phones using only
analog or older digital mobile phone standards. Newer models such as
the double and triple band jammers can block all widely used systems
(AMPS, iDEN, GSM, et al) and are even very effective against newer
phones which hop to different frequencies and systems when interfered
with. As the dominant network technology and frequencies used for
mobile phones vary worldwide, some work only in specific regions such
as Europe or North America.
The power of the jammer's effect can vary widely based on factors such
as proximity to towers, indoor and outdoor settings, presence of
buildings and landscape, even temperature and humidity play a role.
- For this message the author longeight has received thanks:
- RichardGamingo