The land mobile radio, commonly known as the two-way radio or walkie-talkies play a vital role in public safety agencies and private businesses by facilitating communication during their operations. Land mobile radio refers to any radio device that can be operated while it is in motion, which includes the radios attached to your truck or car and even the handheld walkie-talkie. There are different types of land mobile radio antennas available in the market.
These antennas come in all shapes and sizes and can be tall, short, wide or narrow. The material is usually made of synthetic materials and can be horizontally or vertically polarized. These antennas are either directional or omnidirectional. The antennas are a crucial component of the design, which ensure that the system fulfills the requirements of the end user. A certain antenna type may be chosen by the engineer according to the design parameters of the system to ensure that it provides the match between available radio sites and the coverage requirements. The land mobile radio antenna systems networks comprise of earth-grounding connections, waveguide, lightning surge protection, coaxial transmission lines, coaxial jumpers, and coaxial or electronic filtering along with the antennas themselves.
So choosing the right one for yourself can be a bit confusing. Read on to find out more regarding the various factors that are considered when determining the antenna system that is beneficial for you:
All the towers and even some building rooftops have a maximum wind-load and weight load rating, which must be kept in mind when selecting the antenna type.
BAND OF OPERATION:
The band of operation is also among the factors considered while determining the antenna system that suits your requirements as smaller antennas will allow for higher gains at higher frequencies and an increase in frequency will decrease the size of a quarter wavelength in direct proportion.
The dense urban designs are the biggest challenge for an antenna system’s spectrum efficiency. To overcome these difficulties in areas that are laid out in a street-grid format the low gain or down tilted antennas are placed on tall rooftops to enable subscribers to receive signals. Antennas are also placed on the corners of strategic buildings at a lower level to balance the need to cover avenues and streets to enable radiators to be at a lower level, which allows the reuse of the frequency or prevents interference to co-channel users.
Portable antennas have issues owing to the radio signals being shadowed by the body of a person wearing the device on the hip. It can be overcome by using remote speaker microphones that elevate the antenna to the shoulder of an individual wearing the radio. Satellite radios and providing the signal an ability to be received in multiple directions from a given site can also effectively address the issues that occur, due to shadowing.
A clear selection of antennas allows the design engineers to tailor the radio frequency design to meet a system’s coverage objective. However, caution regarding the distortions caused by the side mounting of portable antennas on the hip, improper mounting of mobile antennas on vehicle roofs, and the tower structures should be considered to avoid inaccuracies in the design.
Land mobile radio antennas market is expected to surpass US$ 150 million by 2027, with a significant demand in industries such as public safety, military & defense and mining, says Absolute Markets Insights.