General Mobile Radio Service
The General Mobile Radio Service (GMRS) is a land-mobile FM UHF radio service designed for short-range two-way voice communication and authorized under part 95 of the US FCC code. It requires a license in the United States, but some GMRS compatible equipment can be used license-free in Canada. The US GMRS license is issued for a period of 10 years by the FCC. The United States permits use by adult individuals who possess 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[1] 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 (walkie-talkies) much like Family Radio Service (FRS) radios, and they share a frequency band with FRS 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 certified for GMRS under USC 47 Part 95.
(or older radios that are certified under USC 47 Part 90 as they are "grandfathered in" and are able to be programmed with GMRS frequencies and used legally for GMRS as well)
GMRS licensees are allowed to establish repeaters to extend their communications range. GMRS repeaters are not authorized to connect to the public switched telephone network. Only Remote control can be used by the station owner.
Licensing[edit]
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, online through the FCC's Universal Licensing System. No exam is required. A GMRS license is issued for a 10–year term.[2]
The current fee was reduced to $35 for all applicants on April 19, 2022.[3]
A GMRS individual license extends to immediate family members and authorizes them to use the licensed system.[4] GMRS license holders are allowed to communicate with FRS users on those frequencies that are shared between the two services.[5] GMRS individual licenses do not extend to employees.[4]
New GMRS licenses are being issued only to individuals. Prior to July 31, 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.[6]
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.[7]
Range[edit]
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.[8] 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.
History[edit]
The predecessor to GMRS was named Class A Citizens Radio Service when it was commissioned 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 five 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.[16] Adopted on May 20, 2015, the ruling would be in effect after a 90–day notification period to Congress; the fee will not be eliminated before August 18, 2015.[17] The fee for a 5–year license was $90, 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. The change became effective on September 3, 2015.
Effective September 28, 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 certification 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.[18]
On September 30, 2019, it became unlawful in the United States to import, manufacture, sell, or offer to sell radio equipment capable of operating under both GMRS and FRS.[19]
Use of GMRS equipment in other countries[edit]
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.[20] Typically these are dual FRS and GMRS units, with fixed antennas, and operating at 2 watts on some GMRS channels and 0.5 watts 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 16–channel system near 446 MHz known as PMR446, as well as a 69–channel low-power LPD433 which is shared with the 433.92 MHz 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.
GMRS License fee change[edit]
Currently, the application fee for a GMRS license is $35. An FCC Report and Order released December 23, 2020, and in a subsequent notice issued by the FCC on March 23, 2022, the fee dropped from $70 to $35 starting on April 19, 2022. The license is still valid for 10 years and covers an entire family.