General Mobile Radio Service

General Mobile Radio Service ( GMRS ) is a radio application that is in use particularly in the U.S. and South America.

Anyone who has a GMRS radio license GMRS devices may even pass to relatives, partners and members of the immediate family, even if they have no radio license in order to own land / plot, with hiking, sports tours, trekking and paragliding tours to communicate outside of its own possessions. The special feature of these handy devices is the range of up to 25 kilometers.

Typically, GMRS radios are small hand-held devices similar to the popular devices in the walkie-talkie style for Freenet, PMR radio ( PMR 446 ) and SRD- Wireless (formerly LPD), or CB radio

Technical Information

GMRS used frequencies in the UHF band. The use of relays is supported. The antennas on the device can be exchanged or stationary antennas are mounted. Originally launching with 15 channels, have modern Family Radio Service (FRS ) / GMRS hybrid devices that there are now almost exclusively to buy, to 22 channels. Seven of these channels GMRS shares using the free citizens' band radio FRS. The FRS channels 8 to 14 can not be used by GMRS devices; for these frequencies, a FRS radio device is required.

In hybrid devices are only channels 8-14 from the FRS band. Also for sending on these shared channels, a license is required if, as is usually the case, the effective transmission power is higher than 500 milliwatts (1/2 watt). In general, the units feature 5 watts transmit power. It lies with the operator of the equipment to comply with the applicable regulations and to comply with.

If visibility is good, about from mountain top to mountain top or in the air, connections over more than 100 km are quite possible.

List of channels

• Radio application