What is LMR?
Land Mobile Radio (LMR) is a section of wireless communications intended for use by terrestrial (ground or marine) applications be it vehicular (mobiles) or hand- held two-way communications (portables).
LMR antennas can be completely self-contained fixed systems such as those used by companies with fleet vehicles, or can be integrated into fixed communications systems such as the public switched telephone network or cellular networks such as those used by first responders.
LMR can also be known as Public Land Mobile Radio, Private Land Mobile Radio, or Land Mobile Radio System (LMRS).
Where is Land Mobile Radio (LMR) Used?
Land Mobile Radio is used in a variety of applications. Here are some examples:
- Emergency Communications by local governments in public safety
- Dispatch communications by companies
- Security communications
- Critical two-way communications
- Private use in many activities from the simplest person to person communication
- Person-to-person in a large event to locate each other
- Vehicle-to-vehicle in a transportation, freight, or other applications
- Companies use in a range of industries
- Marine applications
- Military and governmental applications for reliable communications and homeland defense
Utilities, railroads, delivery companies, landscapers, building maintenance all rely on LMR
Typical equipment used:
Vehicular applications: A variety of radio manufacturers offer design-in, fixed mounted radio units that connect to external antennas that can be mounted in a variety of areas. They vary in size, length and shape but almost all are designed to be connected to some mounting base that is connected via coax cable to the fixed mounted radio.
The mounting bases (available in Laird products) can be connected to the vehicles at a variety of areas such as: mirror, trunk, light bar or surface mounts. The antennas are built to be very rugged and offer a variety of design shapes and features to ensure a long life in a very harsh environment and ensure clear paths from vehicles to the base station transmission locations.
Portable Applications: Portable applications include conventional walkie-talkie types of radios that are carried on the person. Typical applications use some portable radio connected to a flexible "rubber duck" type of antenna that is connected directly to the portable radio. Some applications utilize a remote speaker/microphone connected via coax to the portable radio with the antenna sometimes located on the remote.
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