Two-way radios, just like standard
radios, receive radio waves (RW) over the air. Radios convert RW into sound.
The defining characteristic of a 2WR, however, is the ability to also convert
sound b...
Two-way radios, just like standard
radios, receive radio waves (RW) over the air. Radios convert RW into sound.
The defining characteristic of a 2WR, however, is the ability to also convert
sound back into RW for transmission to another radio-receiver. A 2WR can
transmit and at the same time can receive a radio signal. It uses to different
radio frequencies to carry the two directions of the conversation
simultaneously.
The antenna in a 2WR contains a set
of electrons. When a radio transmission is received, the RW excite the
electrons and cause them to produce electrical impulses. For transmission, the
radio's processor notes sound vibrations created by speaker's voice, it
converts them into an electronic signal which is then ready for transmission to
the radio transmitter. When the modulated frequency is sent to the antenna and
the proper electrons are excited, outgoing RW are generated; these RW can then
be picked up by other radios within a small area determined by such factors as
the size of the antenna, the battery power of the radio, and atmospheric
conditions.
Some of today's radios also allow
scanning. Scanning is the process where several channels can be checked to see
if anyone is transmitting on any of the scanned frequencies. When the scanning
process detects that a channel is receiving a transmission with the same P.L.
tone or Private line tone (In P.L. Mode, the radio's speaker will activate only
if another radio is transmitting on the same P.L. Tone.) the radio will stop
scanning, lock on that active channel and open up the speaker.
Most modern 2WR allow use of
multiple channels. To broadcast on different channels, the transmitter of the
radio must be able to generate RW in several different frequencies, with very
minute fluctuations in each available frequency.
It remains so in-demand because even
in the face of mobile phones and laptops, people still realize the great ease
and accessibility of instant communication with a group of people. This defeats
pushing in several phone numbers and waiting for everyone to either answer or
not accept the call.
Whether it is for home, work, or
play; everyone and their grandmother will be happy if they were to find their
new 2WR waiting. No matter what reason you or your family and friends have to
communicate with one another, you will find that a 2WR is the best option
available. They come in handy in a wide variety of situations and their ease
can never be replaced even by the more popular communication tools of today.
source : http://www.articlesfactory.com/articles/technology/two-way-radios-how-do-they-work.html
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