Family Radio Service

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Motorola T5320 FRS handheld radio

The Family Radio Service (FRS) is an improved walkie talkie radio system authorized in the United States since 1996. This personal radio service uses channelized frequencies in the ultra high frequency (UHF) band. It does not suffer the interference effects found on citizens' band (CB) at 27 MHz, or the 49 MHz band also used by cordless phones, toys, and baby monitors. FRS uses frequency modulation (FM) instead of amplitude modulation (AM). Since the UHF band has different radio propagation characteristics, short-range use of FRS may be more reliable than license-free radios operating in the HF CB band.
Initially proposed by Radio Shack in 1994 for use by families, FRS has also seen significant adoption by business interests, as an unlicensed, low-cost alternative to the business band.

Technical information

FRS radios are limited to 500 milliwatts according to FCC regulations. Channels 1 to 7 are shared with low-power interstitial channels of GMRS, the General Mobile Radio Service. A license is required for those channels if the power output is over FRS limits.
Unlike Citizens' Band (CB) radios, FRS radios frequently have provisions for using sub-audible tone squelch (CTCSS and DCS) codes, filtering out unwanted chatter from other users on the same frequency. Although these codes are sometimes called "privacy codes" or "private line codes" (PL codes), they offer no protection from eavesdropping and are only intended to help share busy channels. Tone codes also do nothing to prevent desired transmissions from being swamped by stronger signals having a different code.
FRS stations on channels 1 through 7 may communicate with GMRS stations on those shared channels; the GMRS stations may use up to 5 watts of power, while the FRS stations are restricted to 0.5 watts.
The use of duplex radio repeaters and interconnects to the telephone network are prohibited under FRS rules, unlike GMRS which allows repeaters, and unlike the Amateur Radio Service. FRS radios must use only permanently-attached antennas. This limitation intentionally restricts the range of communications, allowing greatest use of the available channels.
FRS manufacturers generally claim exaggerated range. The presence of large buildings, trees, etc., will reduce range. Under exceptional conditions, (such as hill-top to hill-top) communication is possible over 60 km (40 miles) or more, but that is rare. Normal conditions, with line-of-sight blocked by a few buildings or trees, mean FRS has an actual range of 0.5 to 1.5 km (1/3 to 1 mile).

FRS/GMRS hybrid radios in the United States

Motorola FV150 FRS and GMRS handheld radio

Hybrid FRS/GMRS consumer radios have been introduced that have 22 channels. Many of these radios have been certified for unlicensed operation (on the 14 FRS frequencies, channels 1-14) under FRS rules. ^[1]
The FCC rules and statements regarding the use of hybrid radios on channels 1-7 stipulate the need for a GMRS license when operating under the rules that apply to the GMRS. Many hybrid radios have an ERP that is lower than 0.5 watts on channels 1-7, or can be set by the user to operate at low power on these channels. This allows hybrid radios to be used under the license-free FRS rules if the ERP is less than 0.5 watts and the unit is certified for FRS operation on these frequencies.
Owners of hybrid radios should be aware that in the United States of America it is illegal to operate on channels 15-22 without an FCC GMRS license. Most radio manufacturers do not make this sufficiently clear to customers. Consequently, this can cause unlawful interference to GMRS licensees. As GMRS licenses cost money to obtain, such interference is a source of frustration for duly-licensed operators.
Channels 8-14 are exclusively for FRS. Accordingly, GMRS operation is not allowed on these channels. Channels 15-22 are reserved exclusively for GMRS. As noted, FRS operation is not allowed on these channels.

List of FRS channels

Channel	Frequency (MHz)	Notes
1	462.5625	Shared with GMRS.
2	462.5875	Shared with GMRS.
3	462.6125	Shared with GMRS.
4	462.6375	Shared with GMRS.
5	462.6625	Shared with GMRS.
6	462.6875	Shared with GMRS.
7	462.7125	Shared with GMRS.
8	467.5625	FRS use only
9	467.5875	FRS use only
10	467.6125	FRS use only
11	467.6375	FRS use only
12	467.6625	FRS use only
13	467.6875	FRS use only
14	467.7125	FRS use only

Some clubs have recommended FRS Channel 1 as a National Emergency / Calling Channel, such as REACT International, Inc. and the National SOS Radio Network.
Channel 2 is typically used by Geocaching groups when trying to connect with other Geocachers.^[2]

Similar services in other regions

Personal UHF radio services similar to the American FRS exist in other countries, although since technical standards and frequency bands will differ, usually FCC-approved FRS equipment may not be used in other jurisdictions.

Taiwan

Some manufacturers in Taiwan have radios that carry both FRS and GMRS frequencies, using channels 1 to 99. Channels 1 to 14 are well-known, while channels 15 to 99 are less popular.
channels 15 462.9125, ch16 462.9375, ch17 462.9625, ch18 462.9875, ch19 463.0125, ch20 463.0375, ch21 .....
... ch98 464.9875, ch99 465.0125.

Canada

American-standard FRS radios have been approved for use in Canada since April 2000. The revised technical standard RSS 210 has essentially the same technical requirements as in the United States. Since September 2004,low-power GMRS radios and dual-standard FRS/GMRS radios have also been approved for use in Canada, giving additional channels. In Canada, no license is required and no restrictions are imposed on the GMRS channels. ^[3]

Mexico

Since tourists often bring their FRS radios with them, and since trade between the U.S., Canada, and Mexico is of great value to all three countries, the Mexican Secretary of Communication and Transportation has authorized use of the FRS frequencies and equipment similar to that in the US. However, dual-mode FRS/GMRS equipment is not approved in Mexico, so caution should be exercised in operating those hybrid FRS/GMRS devices purchased elsewhere. ^[4]

Europe

In Europe, a personal radio service with the same sort of licensing restriction is PMR446 having eight channels in the 446 MHz range. One cannot legally use the FRS radio in Europe or PMR446 in the U.S. The 446 MHz band is allocated to amateur radio in the United States, so in principle a licensed amateur operator could use non-FCC-type-accepted PMR446 radios in the U.S. in compliance with the rules for amateur radio operation. In Great Britain, FRS frequencies are used for fire brigade communications and this sometimes causes problems when FRS equipment is imported from the U.S. and used without awareness of the consequences by members of the public.

South America

Dual-mode GMRS/FRS equipment is also approved in Brazil and most South American countries. Portable radios are heavily used in private communications, mainly by security staff in nightclubs and malls, but also in private parking, maintenance, and delivery services.

China

A service similar to the American-style FRS in Hong Kong, Macau, and China is also approved by respective organizations for legal license-free operation. However, different UHF frequencies with 20 allocated channels near 409 MHz are used. 462 MHz and 446 MHz band are not opened to FRS service, so European, American, and Canadian residents are advised not to use FRS or PMR446 radios for communication when traveling to the aforementioned areas.

Japan

In Japan, a similar service is limited to 10 millwatts in the 420, 421, and 422 MHz bands. It is called "Tokutei Shoudenryoku Musen" ("SLPR:Specified Low Power Radio").

Australia and New Zealand

In Australia and New Zealand, the UHF CB citizen's band near 477 MHz is used for a similar purpose. The Australian Communications and Media Authority (ACMA) also allocated a band near 434 MHz for low-powered devices with low potential for interference to other users of the band. ^[5]

South Africa

South Africa is in the process to conforming to ITC region 1 recommendations, they do allow 8 channels of FRS radios 446.0-446.1 MHz band currently, this is different from the North America FRS/GMRS Bands.

Philippines

The Philippines has a radio service for use of families and small businesses. This service is called SRRS or Short Range Radio Service. Units are limited to simplex operations and have a power limitation of 2.5 watts. ^[6]
This service has been allocated 40 channels in 325 MHZ spectrum:

Channel Frequency	Channel Frequency	Channel Frequency	Channel Frequency
1 325.0000	11 325.1250	21 325.2500	31 325.3750
2 325.0125	12 325.1375	22 325.2625	32 325.3875
3 325.0250	13 325.1500	23 325.2750	33 325.4000
4 325.0375	14 325.1625	24 325.2875	34 325.4125
5 325.0500	15 325.1750	25 325.3000	35 325.4250
6 325.0625	16 325.1875	26 325.3125	36 325.4375
7 325.0750	17 325.2000	27 325.3250	37 325.4500
8 325.0875	18 325.2125	28 325.3375	38 325.4625
9 325.1000	19 325.2250	29 325.3500	39 325.4750
10 325.1125	20 325.2375	30 325.3625	40 325.4875

Thailand

Thailand has an 80 channel CB-style service using FM in the band 245.000-245.9875 MHZ. Units are allowed up to 5 watts RF power. Besides personal use, the equipment is used by search and rescue and businesses. Operating rules are less restrictive than amateur radio service, with an initial license fee required. The hand-held units usually have a red case. There are an estimated one million users of the service, often in large cities. ^[7]

References

^ FCC: Wireless Services: Family Radio Service : Family Home
^ "Frequently Asked Questions". Groundspeak Inc.. http://www.geocaching.com/faq/. Retrieved 2009-07-29.
^ http://www.ic.gc.ca/eic/site/smt-gst.nsf/eng/sf01320.html Industry Canada RSS-210 - Low-power Licence-exempt Radiocommunication Devices (All Frequency Bands) retrieved 2009 Oct 23
^ http://www.geocities.com/wd9ewk/xe-frs.html Mexico's Family Radio Service (FRS) equivalent retrieved 2009 Oct 23
^ ACMA spectrum for 434 MHz LIPD devices
^ http://r7.ntc.gov.ph/memopdf/fixedland/MC%2002-01-97%20.PDF MEMORANDUM CIRCULAR NO. 02-01-97 SUBJECT: LICENSING GUIDELINES AND PROCEDURES FOR THE SHORT RANGE RADIO SERVICE (SRRS), retrieved 2009 Oct 23
^ http://www.rast.or.th/tares.html Thailand amateur radio emergency services , retrieved 2009 10 24

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Friday, October 30, 2009