|
The Family Radio Service
The FRS (Family Radio Service), along
with the GMRS (General Mobile Radio Service), and a little known service
called MURS (Multi Use Radio Service), are all products of the PRSG (Personal
Radio Steering Group). This group lobbied for a dependable, low cost means
of radio communications for the average citizen, which reflected current technologies.
Advances in engineering made radio gear smaller, cheaper, easier to produce,
and considerably more capable. Public radio services had pretty much been
limited to CB Radio, and Business Band radio, unless one wished to become
a licensed ham operator.
At its inception, during the fifties, CB radio had been up
in the UHF bands. Due to the technology of the time, it was very expensive
and very difficult to make radios that used these bands, particularly for
transmitting. IT was finally decided to take the old 11 meter band away from
ham operators, and give it over to the CB service, designating the higher
frequency UHF band to other things. More recently, though, with increased
technology and miniaturization, the UHF bands have actually become practice
for use with small, cheap radios. The Family Radio Service, and the closely related GMRS
are both 460mhz FM services designed for short range, non radio hobby use.
There is thus a certain amount of confusion surrounding them both. They differ
in a number of respects, which are summarized in the table below:
|
GMRS
|
FRS
|
License required
|
Yes ($85)
|
No
|
Maximum Power
|
50 watts (7 watts on FRS shared)
|
500mw
|
Frequencies and Channels
|
Simplex Frequencies (Shared with FRS)
Designator
Frequency
"5625" or "FRS 1" 462.5625 MHz
"5875" or "FRS 2" 462.5875 MHz
"6125" or "FRS 3" 462.6125 MHz
"6375" or "FRS 4" 462.6375 MHz
"6625" or "FRS 5" 462.6625 MHz
"6875" or "FRS 6" 462.6875 MHz
"7125" or "FRS 7" 462.7125 MHz
Split Frequencies
Designator Lower Frequency Upper Frequency
"550" 462.550
MHz 467.550 MHz
"575" 462.575
MHz 467.575 MHz
"600" 462.600
MHz 467.600 MHz
"625" 462.625
MHz 467.625 MHz
"650" 462.650
MHz 467.650 MHz
"675" 462.675
MHz 467.675 MHz
"700" 462.700
MHz 467.700 MHz
"725" 462.725
MHz 467.725 MHz
|
Shared Frequencies (with GMRS)
1. 462.5625
2. 462.5875
3. 462.6125
4. 462.6375
5. 462.6625
6. 462.6875
7. 462.7125
FRS Only Frequencies
8. 467.5625
9. 467.5875
10. 467.6125
11. 467.6375
12. 467.6625
13. 467.6875
14. 467.7125
|
Coverage
|
Local short range
|
Local short range
|
Mode
|
FM Voice
|
FM Voice, data
|
As can be seen, both services use the same frequency
band, mode of operation, and even share some of the exact same frequencies.
They differ in the type of user they are targeted at, and the type of usage.
One thing that they share, is that neither service was meant for hobby use
by radio enthusiasts. Both services are aimed at the non technical user who
simply wishes a reliable means of short range communication. There is no
license required for FRS, and no test is required for the license for GMRS.
This is reflected somewhat in the marketing approach taken by producers of
FRS, and GMRS gear. No manufacturer of ham radio gear would damage his
credibility
by giving estimated range. Radio enthusiasts know that there are too many
variables involved to make any such estimates valid. ham operators and other
technophiles are interested in radiated power, antenna gain, and other such
specifications. Those who are less technically savvy want to know how far
they can talk. So advertisers will tell you that there is a range of 5 miles,
or 16, miles, or 25 miles, often for gear with the same technical specs.
FRS
The Family Radio Service was meant to be a short range,
low powered service for casual wireless communications. Intended uses were for
hunters in the field, kids playing with walkie talkies, hiking, fishing, or just
wandering around the neighborhood. Most units are quite
cheap, and offer an array of features formerly only available on commercial
units. Most are rechargeable units, which use drop in cradles to restore power. All
are small digital units. What this was not meant to be, was a radio hobby
service, or a business service.
This was meant to be a low end, casual service, so there
is no license required, but there are some significant limitations. The
most obvious is the power limit of 500mw. This is a fraction of the wattage
than is permitted in GMRS, and even considerably less than is allowed in
the common CB units. Because this is not meant to be a radio hobby service, no
base station units are allowed - this is strictly a service for hand held
radios. External antennas are not allowed, and the antenna design must not
provide any signal gain, essentially banning beams, and longer antennas.
GMRS
Fifteen channels on twenty three frequencies.
Eight duplex, and seven simplex channels are part of the service. These units
are allowed considerably more power, up to 50 watts, are allowed to access repeaters for
great range, and are capable of duplex operation. An $85 license is required
for legal operation of these radios. Unfortunately, as with CB, this requirement
is largely being ignored, particularly by hybrid users. GMRS radios may be used
for business as well as personal communications, and a license had at one time
been granted to corporate entities, for use by employees.
Hybrid (22Channel)
This is an unfortunate introduction into most manufacturer's
product lines, because it shows a great misunderstanding of the differences
between the two radio services. Rarely would the same user have a desire
to legitimately use both bands. What is even more unfortunate is that these
models are coming to dominate the market, because of marketing department
pressure, and the sales hype of being able to offer "both" bands in a single
radio. With most of today's electronic gear being computer controlled to
some degree, there is little or no extra cost required to program seven extra
channels into a radio and make it that much more saleable to an uninformed
buyer.
My main problem with these units is that a buyer who
wants the higher power of a GMRS, and is willing to pay the license fee,
and the presumably higher cost of a GMRS unit, will really have no need of
the extra seven FRS channels. What the hybrid buyer is getting is essentially
an FRS unit programmed to also use GMRS frequencies. Though there are some
exceptions, most of these units do not offer the higher power, or
better internals that a pure GMRS would feature. On the other hand, the
FRS user will be mighty tempted to use those extra GMRS channels built into
his unit, even though he may not be licensed to do so. It does appear that,
with the hybrid radios as a catalyst, the GMRS/FRS may be allowed to degenerate
in the same was as CB.
|