Family Radio Service: Difference between revisions
Undid revision 411042412 by Wtshymanski (talk) |
Wtshymanski (talk | contribs) reference for those unfamiliar with subject matter |
||
| Line 25: | Line 25: | ||
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 [[Effective radiated power|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. |
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 [[Effective radiated power|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. |
||
In the United States of America operation on channels 15-22 require an FCC GMRS license. Interference to licensed services may be investigated by the [[Federal Communications Commission|FCC]]. <ref> http://wireless.fcc.gov/services/index.htm?job=service_home&id=general_mobile General Mobile Radio Service , retrieved 2011 01 31 </ref> |
|||
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. |
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. |
||
Revision as of 14:31, 31 January 2011
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 predictable 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.
Worldwide a number of similar personal radio services exist; these share the characteristics of low power, operation in the UHF (or upper VHF) band using FM, and simplified or no end-user licenses. Exact frequency allocations differ, so equipment legal to operate in one country may cause unacceptable interference in another.
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.
FRS radios must use only permanently-attached antennas, such as walkie-talkies; there are also table-top FRS "base station" radios that have whip antennas. This limitation intentionally restricts the range of communications, allowing greatest use of the available channels. The use of duplex radio repeaters and interconnects to the telephone network are prohibited under FRS rules, unlike GMRS and the Amateur Radio Service.
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
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.
In the United States of America operation on channels 15-22 require an FCC GMRS license. Interference to licensed services may be investigated by the FCC. [2]
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.[3]
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.
Using FRS frequencies
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.[4]
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 hybrid FRS/GMRS devices purchased elsewhere.[5]
South America
Dual-mode GMRS/FRS equipment is also approved in Brazil and most South American countries.[citation needed] 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.
Using other frequencies
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.
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. 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. Sweden and Norway have a Kort Distanse Radio service with six UHF channels between 444.600 and 444.975 MHz. European countries also have Low-power communication devices operating in the 433 MHz band, and short-range devcies (SRD) operating on frequencies between 868 and 870 MHz. These devices are restricted to 10 mW output power and are intended to provide an alternative to PMR 446 over short distances.
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, with the name of "Public Radio Service". 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.
List of China Public Radio Service Channels:
| Channel | Frequency (MHz) |
|---|---|
| 1 | 409.7500 |
| 2 | 409.7625 |
| 3 | 409.7750 |
| 4 | 409.7875 |
| 5 | 409.8000 |
| 6 | 409.8125 |
| 7 | 409.8250 |
| 8 | 409.8375 |
| 9 | 409.8500 |
| 10 | 409.8625 |
| 11 | 409.8750 |
| 12 | 409.8875 |
| 13 | 409.9000 |
| 14 | 409.9125 |
| 15 | 409.9250 |
| 16 | 409.9375 |
| 17 | 409.9500 |
| 18 | 409.9625 |
| 19 | 409.9750 |
| 20 | 409.9875 |
Japan
In Japan, a similar service is limited to 10 milliwatts in the 420, 421, and 422 MHz bands. It is called "Tokutei Shoudenryoku Musen" ("SLPR:Specified Low Power Radio").{[citation needed]
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.[6]
South Africa
South Africa is in the process of conforming to ITC region 1 recommendations. They do allow 8 channels between 446.0-446.1 MHz band currently, this is the same as the European PMR446.[citation needed]
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.[7]
This service has been allocated 40 channels at 325 MHz:
| 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 between 245.000 and 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.[8]
Singapore
Since 3 February 2004, the Infocomm Development Authority of Singapore (IDA) has allocated the 446.0-446.1 MHz frequency band for low-powered walkie-talkies on a non-interference, non-protected and shared-use basis. As these walkie-talkies are low-powered devices which do not potentially cause interference to other licensed radio services, it need not be licensed for use in Singapore. However, the device must be type approved by IDA for local sale. [9]
See also
References
- ^ FCC: Wireless Services: Family Radio Service : Family Home
- ^ http://wireless.fcc.gov/services/index.htm?job=service_home&id=general_mobile General Mobile Radio Service , retrieved 2011 01 31
- ^ "Frequently Asked Questions". Groundspeak Inc. 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://web.archive.org/web/20091026203800/http://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
- ^ Wider Choice of Radio-Communication & Wireless Devices for Consumers and Total Annual Savings of $200,000 for Telecom Equipment Dealers: http://www.ida.gov.sg/News%20and%20Events/20050712103130.aspx?getPagetype=20
External links
- CTCSS Codes for some Radios
- FRS Radios in Mexico
- Industry Canada discussion on the approval of FRS in Canada
- Personal Radio Association
- FRS and GMRS radio information and forums
- F-R-S Communications Center
- The situation of License Free Radio System in Japan
- REACT International, Inc.
- National SOS Radio Network
- List of worldwide hand-held radio services retrieved 2009 10 24 [dead link]