September 2003
Intermediate to advanced
304 pages
8h 39m
English
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FRS and GMRS: Super Walkie-Talkies
Use these high powered radios in places where mobile phones just don’t cut it.
In the last couple of years, a number of manufacturers have come out with “high power” radios for general use, marketed as family or recreational communication devices and sold as impulse buy items at department stores. They claim a couple of miles range, operate on a chargeable battery pack or AA batteries, and most are surprisingly rugged and simple to use.
The two technologies behind these popular radios are
FRS and GMRS. While sold in
similar packaging and frequently sitting on shelves right next to
each other, these two types of radios are quite different in
capabilities and operating rules.
FRS
FRS stands for Family Radio
Service
, and was approved by the FCC for
unlicensed use in 1996. It operates around 462 and 467 MHz, and is
sometimes referred to as "
UHF Citizens
Band.” It is not a Part 15
device like 802.11 radios, but is governed by FCC Part 95,
Personal Radio
Services
. FRS radios share some channels with
GMRS radios but are restricted to 500mW maximum
power. Manufacturers typically claim
two miles as the maximum
range of FRS radios. FRS radios come
with fixed antennas, and cannot be legally modified to accommodate
antennas or amplifiers.
FRS channels 1 through 7 overlap with GMRS and can be used to communicate with GMRS radios. If you need to talk only to other FRS radios, use channels 8 through 14 to avoid possible interference with low band GMRS users. ...
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.