is a Repeater?
A duplex repeater, in concept, is not really a complicated
device. It's a 'duplexed' two-way radio set that listens
on one frequency, then retransmits what it hears on another;
at exactly the same time. These systems are usually located
in places of high elevation (on mountains and tall buildings)
and are equipped with large - efficient antennas, extremely
low loss feedlines, and a transmitter and receiver that
is very durable and rated for continuous duty. The end
result? People using a repeater get much greater range
from their radio equipment than would be possible talking
simplex. This is how an individual with a portable walkie-talkie
(handheld) transceiver can communicate with people many
miles away with good clarity.
ham (Amateur) repeater is often times referred to as "a
machine" or "the machine". Repeaters are
used in Commercial (Business)Communications, Emergency
Communications (either by 'hams' or by Federal or Local
Government agencies), and even Pleasure Communications.
These machines might have multiple sources of power, including
batteries for when commercial power is lost. Repeaters
can be built that are extremely power efficient, and may
run exclusively from batteries; recharged by solar, wind
or water power.
Repeater 101 by Kevin K. Custer W3KKC