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PoliceScanner | Police Scanner
Frequency | Police Scanner Live
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A
PoliceScanner is a radio receiver that
automatically tunes, or scans, two or more discrete frequencies.
UNIDEN Bearcat Scanners are the most
popular. Police Scanner Products
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PoliceScanner
Generally, scanners cover the
non-broadcast radio bands between 30 and 950 MHz using FM, although
there are models that cover more of the radio spectrum and use other
modulation types.
Most scanners are used as police
scanners, monitoring police dispatches. During the past few years
many police departments have upgraded to digital, trunked systems making
it more difficult to monitor their transmissions. Although, police
scanner vendors such as UNIDEN have developed scanners capable of
receiving such radio transmissions.
The Uniden Bearcat
BCD996T is
the latest in scanner technology.
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Police Scanners developed from
earlier tunable and fixed-frequency radios that received one frequency
at a time. Non-broadcast radio systems, such as those used by public
safety agencies, do not transmit continuously.
Bearcat
Radio Scanners from UNIDEN and the PRO Trunking Scanner
from Radio Shack have been very popular.
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With a radio fixed on a single frequency,
many minutes could pass between signals. The development of the scanner,
with its multiple frequencies, allowed the radio to move on to the next
frequency after a transmission ended on the first frequency.
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Police Scanner Info
Police Scanners first became popular
and widely available during CB Radio's heyday in the 1970s. The first
scanners used crystals and had only a few programmable channels. Modern
police scanners allow thousands of frequencies to be stored in
various 'memory banks' and can scan at a very fast rate due to modern
microprocessors, they even allow scanning of the specific DCS or CTCSS
code used on a specific frequency should it have multiple users. One
memory bank can be assigned to air traffic control, another can be for
local marine communications, and yet another for local police
frequencies. These can be switched on and off depending on the user's
preference.
Police Scanner
Frequencies
can be found by searching the internet
or can be discovered through a radio's search function. An external
antenna for a desktop scanner or an extendable antenna for a handheld
unit is a good idea for optimum performance.
PoliceScanner Legal
Issues
Police scanners have had a mixed
response from law enforcement agencies and sometimes championed by those
supporting civil liberties. In some communities, law enforcement has
chosen to encrypt their communications. Although scanners capable of
following trunked radio systems and capable of demodulating some
digital radio systems such as APCO Project 25 are available,
decryption-capable scanners would be a violation of United States law
and possibly laws of other countries.
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In the United Kingdom and France, it is illegal to listen to almost
anything outside the amateur radio and broadcast bands. Canada allows
any analog transmission to be monitored but content of the communication
may not be disclosed. In some parts of the United States, there are
extra penalties for the possession of a police scanner during a
crime. Other countries consider possession of a scanner at any time an
offense.
Before
you buy or use a police scanner -
check local laws and regulations. Make sure you obtain scanner
frequencies from legal sources.
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PoliceScanner | Police Scanner
Frequency | Police Scanner Live
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