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General Mobile Radio Service

The General Mobile Radio Service (GMRS) is a land-mobile FM UHF radio service designed for short-distance two-way communication. It requires a license in United States but some GMRS compatible equipment can be used license-free in Canada. The United States permits use by adult individuals who possesses a valid GMRS license, as well as their immediate family members.[a] Immediate relatives of the GMRS system licensee are entitled to communicate among themselves for personal or business purposes, but employees of the licensee who are not family members are not covered by the license   non-family members must be licensed separately.

GMRS radios are typically handheld portable devices much like Family Radio Service (FRS) radios, and share the FRS frequency band near 462 and 467 MHz. Mobile and base station-style radios are available as well, but these are normally commercial UHF radios as often used in the public service and commercial land mobile bands. These are legal for use in this service as long as they are GMRS type-approved.

Contents

LicensingEdit

Any individual in the United States who is at least 18 years of age and not a representative of a foreign government may apply for a GMRS license by completing the application form, either on paper or online through the FCC's Universal Licensing System. No exam is required. A GMRS license is issued for a 10 year term.[1] The fee is $70 for most applicants.[2]

A GMRS individual license extends to immediate family members and authorizes them to use the licensed system.[3] GMRS license holders are allowed to communicate with FRS users on those frequencies that are shared between the two services. GMRS individual licenses do not extend to employees.[3]

New GMRS licenses are being issued only to individuals. Prior to 31 July 1987, the FCC issued GMRS licenses to non-individuals (corporations, partnerships, government entities, etc.). These licensees are grandfathered and may renew but not make major modifications to their existing licenses.[4]

In any case, each GMRS station must be identified by transmission of its FCC-assigned call sign at the end of a transmission or a series of transmissions, and at least once every 15 minutes for a series lasting more than 15 minutes. The call sign may be spoken or sent with audible tones using Morse code. A repeater station handling properly identified transmissions of others is not required to send its own station identification (47 CFR §95.1751).

RangeEdit

As with other UHF radio services, reliable range is considered to be line-of-sight and the distance to the radio horizon can be estimated based on antenna height. Theoretically, the range between two hand-held units would be about one or two miles (about 1.5–3 km); mobile units have higher antennas and a range of around 5 miles (8 km). A GMRS repeater with an antenna that is high above the surrounding terrain can extend the usable range over a wide area – for example, up to a 20 mile (32.2 km) radius around the repeater station.[5] Obstructions such as hills and buildings can reduce range. Higher power does not necessarily give a proportional increase in range, although it may improve the reliability of communication at the limits of line-of-sight distance.

Frequency assignments and FRSEdit

The GMRS-only channels are defined in pairs, with one frequency in the 462 MHz range for simplex and repeater outputs, and another in the 467 MHz frequency range for repeater inputs. There are eight channels exclusively for GMRS and seven "interstitial" channels shared with Family Radio Service. GMRS use requires an FCC license, and licensees are permitted to transmit at up to 50 watts on GMRS frequencies, depending on the type of station,[6] but 1 to 5 Watts is more common. Units are allowed to have detachable or external antennas.

GMRS licensees are also able to use the first seven of the FRS frequencies (the "interstitial" GMRS frequencies) with a few limitations. Specifically, they may be used as long as one-way pages are not transmitted, communications are limited to voice, and transmission power (ERP) does not exceed 5 Watts (FCC Code §95.29, section f). This allows GMRS users to transmit on a total of 15 channels. FRS channels 8 through 14 are not available for GMRS use; use of these frequencies requires an FRS transceiver, or a hybrid transceiver operating under FRS rules.[7][8]

Hybrid FRS/GMRS consumer radios have been introduced with 22 channels, instead of the 14 channels associated with FRS. On this type of radio, transmitting on shared FRS/GMRS channels 1–7 requires a license if using more than 0.5 Watt. Channels 8–14 are strictly license-free FRS channels. Transmitting on GMRS-only channels 15–22 requires a license. It is the responsibility of the radio user to read and understand all applicable rules and regulations regarding GMRS. These hybrid radios are often referred to as "bubble pack" radios, since they are often packed in a plastic shell, for hanging on a display shelf. The massive sales of these radios have led to the term "bubble-pack pirates", persons who use GMRS without a license.[9]

Effective 28 September 2017, FCC revised the definition of the FRS service. FRS operation is now permitted with up to 2 Watts on the shared FRS / GMRS channels. The FCC will not grant type acceptance for hybrid radios that would exceed the limits for the FRS service on the FRS channels. Current "hybrid" FRS/GMRS radios will not require a GMRS license for power up to 2 Watts, but FRS radios will still not be permitted to use the input frequencies of GMRS repeaters. Any radio exceeding the limits of the new FRS service will be classified as a GMRS radio.[10]

The FCC rules for use of hybrid radios on channels 1–7 require licensing only when operating under the rules that apply to the GMRS.[11] Many hybrid radios have an ERP that is lower than a half-watt 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 one half watt and the unit is certified for FRS operation. Only two makers of hybrid FRS / GMRS radios (Garmin and Motorola) presently sell radios that will operate on the GMRS repeater channels; the common "22 channel" radios cannot be used with GMRS repeaters. The Icom IC-F21GM is a solely-GMRS radio that will also work with repeaters. FRS rules permit only 2.5 kHz (Narrowband FM) frequency deviation on the FRS shared channels. GMRS uses ±5 kHz deviation on the GMRS channels.

Effective 30 September 2019, it becomes unlawful in the USA to import, manufacture, sell, or offer to sell radio equipment capable of operating under both GMRS and FRS.[12]

New GMRS/FRS Frequency chart effective 28 September 2017.[12]

Frequency
(simplex / repeater
output, MHz)
FRS Power FRS Bandwidth GMRS Power GMRS Bandwidth Notes
462.5625 MHz 2 W 12.5 kHz 5 W 25 kHz (1)
462.5875 MHz 2 W 12.5 kHz 5 W 25 kHz (1)
462.6125 MHz 2 W 12.5 kHz 5 W 25 kHz (1)
462.6375 MHz 2 W 12.5 kHz 5 W 25 kHz (1)
462.6625 MHz 2 W 12.5 kHz 5 W 25 kHz (1)
462.6875 MHz 2 W 12.5 kHz 5 W 25 kHz (1)
462.7125 MHz 2 W 12.5 kHz 5 W 25 kHz (1)
467.5625 MHz 0.5 W 12.5 kHz 0.5 W 12.5 kHz (1)
467.5875 MHz 0.5 W 12.5 kHz 0.5 W 12.5 kHz (1)
467.6125 MHz 0.5 W 12.5 kHz 0.5 W 12.5 kHz (1)
467.6375 MHz 0.5 W 12.5 kHz 0.5 W 12.5 kHz (1)
467.6625 MHz 0.5 W 12.5 kHz 0.5 W 12.5 kHz (1)
467.6875 MHz 0.5 W 12.5 kHz 0.5 W 12.5 kHz (1)
467.7125 MHz 0.5 W 12.5 kHz 0.5 W 12.5 kHz (1)
462.5500 MHz 2 W 12.5 kHz 50 W 25 kHz (2)
462.5750 MHz 2 W 12.5 kHz 50 W 25 kHz (2)
462.6000 MHz 2 W 12.5 kHz 50 W 25 kHz (2)
462.6250 MHz 2 W 12.5 kHz 50 W 25 kHz (2)
462.6500 MHz 2 W 12.5 kHz 50 W 25 kHz (2)
462.6750 MHz 2 W 12.5 kHz 50 W 25 kHz (2)
462.7000 MHz 2 W 12.5 kHz 50 W 25 kHz (2)
462.7250 MHz 2 W 12.5 kHz 50 W 25 kHz (2)
467.5500 MHz 50 W 25 kHz (3)
467.5750 MHz 50 W 25 kHz (3)
467.6000 MHz 50 W 25 kHz (3)
467.6250 MHz 50 W 25 kHz (3)
467.6500 MHz 50 W 25 kHz (3)
467.6750 MHz 50 W 25 kHz (3)
467.7000 MHz 50 W 25 kHz (3)
467.7250 MHz 50 W 25 kHz (3)
Table Notes
(1) Shared FRS and GMRS simplex.
(2) Shared FRS and GMRS simplex, GMRS repeater output.
(3) GMRS repeater input.

Frequency chartEdit

In the table below, the so-called "Friendly Name" of a frequency is the portion of the frequency to the right of the decimal (the kHz portion). For example: the "friendly name" for 462.550 MHz is "550".

This first set of frequencies shows the split frequency pairs used in duplex operational mode, often used with repeaters. Simplex (same frequency for receiving and transmitting) mode only utilizes the lower set of frequencies.

GMRS radio channels in the table below use 5 kHz deviation and 25 kHz channel bandwidth although some "bubble pack" combo FRS/GMRS radios utilize 2.5 kHz deviation. For best compatibility of audio level, 5 kHz deviation should be used when communicating with GMRS equipment. The 4-digit decimal GMRS frequencies (shared FRS 1-7 / ICOM 9-15) are spaced 12.5 kHz from the (ICOM 1-8) GMRS frequencies, and may receive interference from other nearby stations. It may be advisable to use 12.5 kHz narrow-band (NFM) in congested areas, or avoid their use as a last resort.

"Friendly
Name"
Lower frequency
(simplex / repeater output, MHz)
Upper frequency
(repeater input, MHz)
Motorola
convention
Icom F21-GM
convention
Color Dot
convention
Notes
"550" 462.550 MHz 467.550 MHz Ch. 15 Ch. 1
"575" 462.575 MHz 467.575 MHz Ch. 16 Ch. 2 White Dot
"600" 462.600 MHz 467.600 MHz Ch. 17 Ch. 3
"625" 462.625 MHz 467.625 MHz Ch. 18 Ch. 4 Black Dot
"650" 462.650 MHz 467.650 MHz Ch. 19 Ch. 5 Use not permitted near the Canada–U.S. border in the U.S.[13]
"675" 462.675 MHz 467.675 MHz Ch. 20 Ch. 6 Orange Dot Often used as emergency and road information calling frequency with tone squelch of 141.3 Hz.
"700" 462.700 MHz 467.700 MHz Ch. 21 Ch. 7 Use not permitted near the Canada–U.S. border in the U.S.[13]
"725" 462.725 MHz 467.725 MHz Ch. 22 Ch. 8

This second set of frequencies shows the interstitial ranges shared with the Family Radio Service services. These frequencies can only be used for simplex operations.

FRS
channel
"Friendly
Name"
Frequency
(MHz)
Motorola
convention
Icom F21-GM
convention
"FRS 1" "5625" 462.5625 MHz Ch. 1 Ch. 9
"FRS 2" "5875" 462.5875 MHz Ch. 2 Ch. 10
"FRS 3" "6125" 462.6125 MHz Ch. 3 Ch. 11
"FRS 4" "6375" 462.6375 MHz Ch. 4 Ch. 12
"FRS 5" "6625" 462.6625 MHz Ch. 5 Ch. 13
"FRS 6" "6875" 462.6875 MHz Ch. 6 Ch. 14
"FRS 7" "7125" 462.7125 MHz Ch. 7 Ch. 15

This third set of frequencies are for FRS use only and are not part of the General Mobile Service. They are included here to show the remaining interstices of the 467 MHz frequency band.

FRS
channel
"Friendly
Name"
Frequency
(MHz)
Notes
"FRS 8" "5625" 467.5625 MHz FRS use only.
"FRS 9" "5875" 467.5875 MHz FRS use only.
"FRS 10" "6125" 467.6125 MHz FRS use only.
"FRS 11" "6375" 467.6375 MHz FRS use only.
"FRS 12" "6625" 467.6625 MHz FRS use only.
"FRS 13" "6875" 467.6875 MHz FRS use only.
"FRS 14" "7125" 467.7125 MHz FRS use only.

HistoryEdit

The predecessor to GMRS was named Class A Citizens Radio Service when it was rolled out in the 1960s. Tube type transceivers were used, and transmitter power was limited to 60 watts (plate input power to the final amplifier tube). The original service ran wideband FM with ±15 kHz transmitter deviation and 50 kHz channel spacing. At the time, this was the norm for all U.S. land mobile services. There was also a Class B Citizens Radio Service which used a different set of 461 MHz channels and was limited to 5 Watts output. Business users were permitted to license in this radio service. Radios were built by consumer electronics firms and commercial two-way radio vendors.

In the 1960s, the UHF 450–470 MHz band was re-allocated to 25 kHz channels. This meant transmitter deviation was reduced to ±5 kHz. This doubled the number of channels available across the entire 450–470 MHz band. Class B Citizens Radio Service channels were re-allocated to other radio services.

In the 1970s, allowed power was again changed to 50 Watts across the output terminals of the transmitter. In 1987, licensing of business users was discontinued and businesses were allowed to continue operating until their licenses expired. There was congestion on all channels in larger metropolitan statistical areas and moving businesses to Business Radio Service channels would provide some relief. The radio service was changed to its present name; General Mobile Radio Service or GMRS.

In 2010 the U.S. Federal Communications Commission (FCC) proposed removing the individual licensing requirement. In 2015, the FCC ruled to keep the license requirement, but to remove the regulator fee for licensing.[14] Adopted on 20 May 2015, the ruling would be in effect after a 90 day notification period to Congress; the fee will not be eliminated before 18 August 2015.[15] The fee for a 5 year license was $90.00, with the regulatory fee portion of the license at $5 per year (or $25 for the 5 year life of the license). After the notification period, the fee for a 5 year license was to become $65.00 . The change became effective on 3 September 2015.

Use of GMRS equipment in other countriesEdit

The use of radio transmitters is regulated by national laws and international agreements. Often radio equipment accepted for use in one part of the world may not be operated in other parts due to conflicts with frequency assignments and technical standards. Some of the roles that the licensed GMRS service fills in the United States are, in other countries, filled by unlicensed or class-licensed services. Generally these services have strict technical standards for equipment to prevent interference with licensed transmitters and systems.

In Canada, hand-held GMRS radios up to 2 Watts have been approved for use without a license since September 2004.[16] Typically these are dual FRS and GMRS units, with fixed antennas, and operating at 2 Watts on some GMRS channels and 0.5 Watt on the FRS-only channels. Mobile units (permanently mounted in vehicles), base stations and repeaters are not currently permitted on the GMRS channels in Canada.

Other countries have licensed and unlicensed personal radio services with somewhat similar characteristics, but technical details and operating conditions vary according to national rules. Many European countries use a similar 8 channel system near 446 MHz known as PMR446, as well as a 69 channel low-power LPD433 which is shared with the ISM band. GMRS equipment that is approved for use in the United States will not communicate with PMR446 radios due to using different frequency ranges.

See alsoEdit

ReferencesEdit

  1. ^ "GMRS Information". FCC.
  2. ^ "GMRS fee schedule" (PDF). FCC.
  3. ^ a b "Title 47 → Chapter I → Subchapter D → Part 95 → Subpart A → §95.179". Electronic Code of Federal Regulations. Retrieved 26 June 2016.
  4. ^ "Licensing: Eligibility". Wireless Services: General Mobile Radio Service. FCC.
  5. ^ Silver, H. Ward (2005). Two-way radios & scanners for dummies. For Dummies. p. 56. ISBN 0-7645-9582-2.
  6. ^ "Electronic Code of Federal Regulations, Title 47". Federal Communications Commission. §95.135. Archived from the original on 8 November 2011.
  7. ^ "ECFR". GPOAccess.gov.
  8. ^ Federal Communications Commission. Personal Radio Services (PDF). Code of Federal Regulations, Title 47. Telecommunication Chapter 1 — Federal Communications Commission, Part 95. United States Government Printing Office. §95.29; §95.603(a); §95.603(d); §95.621; §95.627.
  9. ^ Cantor, Andrew (7 January 2005). "CyberSpeak - Walkie-talkies still fit in the dreams of little boys". USAToday.com. USA Today division of Gannett Co. Inc. Retrieved 11 March 2011.
  10. ^ "FCC Part 95 Personal Radio Services Rules Reform" (PDF). Federal Communications Commission. Retrieved 19 May 2017. Paragraphs 51 and 52 list the changes on the FRS / GMRS channels and power restrictions. These modifications are meant to affect previous FRS / GMRS hybrid radios in the United State that were commonly sold to redefine them as FRS radios, since many users that purchase these radios did not know the FCC license requirements. As a result, these users will not require a GMRS license. Radios transmitting higher than the new FRS power restrictions are re-defined as GMRS radios and users will require a GMRS license to use these devices. The changes (channels and power limitations) went into effect on 28 September 2017.
  11. ^ "General Mobile Radio Service". Retrieved 31 January 2011.
  12. ^ a b "47 CFR § 95.1792". Personal Radio Service reform. 29 August 2017.
  13. ^ a b "General Mobile Radio Service (GMRS)". Federal Communications Commission. Retrieved 11 November 2015. [U]se of frequencies 462.650, 467.6500, 462.7000 and 467.7000 MHz is not permitted near the Canadian border[.]
  14. ^ "FCC-15-59A1" (pdf). Daily Releases.
  15. ^ "FCC-15-59A1" (pdf). p. 9.
  16. ^ Low-Power Licence Exempt Radiocommunications Devices. Industry Canada. RSS 210.

ClarificationEdit

  1. ^ The FCC definition of “immediate family” includes the licensee’s spouse, children, stepchildren, parents, stepparents, siblings, grandparents, aunts, uncles, nephews, nieces, and in-laws. See 47 CFR 95.179 .

External linksEdit