Factors Affecting Two-Way Radio Transmission

Factors Affecting Two-Way Radio Transmission


We’re all aware of the term ‘walkie-talkie’ which is a term generally known in the industry to describe unlicensed handheld radio devices. The term two-way radio includes both unlicensed and licensed equipment, handheld and vehicle mounted. However, due to the wide use of both, the terms walkie talkie and two way radio are used interchangeably to describe all two way communications devices. Two-way radios are one of the best ways of communication, keeping in mind their features and capabilities.

Hytera Two Way Radios

A two way radio works in two ways, either a licensed frequency or a license-free frequency. Two-way radio devices keep you connected by connecting audio to radio waves that are transmitted through the air. These radio waves are then received by other radios that convert the radio waves back to audio. The conversation via radio waves is sent either in analogue or digital, which is a more modern technology.

Analogue / Digital

The two-way radios are available for purchasing usually ranging from 66 MHz to 470 MHz. A selection of popular two-way radios that are available on the market include the Motorola DP4400e, Hytera HP605, Entel DX422, Icom F2100D, Entel DX482 and many more.

It is advisable to speak to your two way radio provider if you are looking to purchase two way radios for the first time or if you have existing equipment and are looking to extend your fleet of radios. There are many new digital features available due to evolving technologies; assess which features could benefit you and your setup and also check for compatibility with an existing fleet.

We have two-way radios for sale on our website. Check out for the best two-way radios and also get to talk to the experts who will guide you to the right product.

Factors that Affect Two-Way Radio Transmission

Radio Power

The power output of a two-way radio is measured in watts and is an important factor in the distance of transmission. A vehicle mounted radio may transmit from 5-25 watts, however, a handheld radio will transmit from 1-5 watts. It is important to remember that the higher the watts of the radio, the farther the transmission. Something to consider, the more watts transmitted the faster the drain on the battery.

Radio Frequencies

The frequency that a two-way device uses and the environment that it is used in gives an indication of how far a radio frequency will communicate. The wavelength affects the transmission range under various conditions.

There are two major formats for most two-way radios: Ultra high-frequency (UHF) radios and very high-frequency (VHF) radios. They both have their advantages and disadvantages, that are effective in their ways but it is very important to decide the right radio for you depending on the application. Let me take you through both of these frequencies to understand if and where they can be used.

UHF and VHF Radio

Commercial radios have a UHF (Ultra high frequency) radio band that ranges between 430 to 470 MHz or VHF (Very High Frequency) ranges between 136-174 MHz.

UHF is the favorable option when using indoors or indoors to outdoors in densely populated areas due to the shorter radio length being able to get around or penetrate areas of interference.

The radio band of VHF ranges between 136-174 MHz. It is an excellent choice for outdoor use, when there is a clear line of sight with little or no obstruction. and works marginally better in hilly terrain than the UHF alternative due to refraction. VHF is commonly used in emergency rescue and marine communication. VHF frequency struggles to work in and amongst trees and rugged landscapes, if the area is heavily wooded or built up then UHF becomes the better choice.

Ofcom requires you to have a license to operate with UHF and VHF two-way radio equipment.

What Can Help?

Repeaters increase the range of your two-way radios. Set up a two-way radio system or a two-way radio repeater tower. Many enterprises such as stadiums, hospital complexes, high-rise buildings, and school campuses use repeaters. You can check out these repeaters for your devices: Motorola SLR 1000 Repeater, Motorola SLR5500, Motorola SLR8000.

Improving your external antenna system is a great way to improve your system’s performance. To make sure that the range is optimised, the antenna must be as high as possible. We have all kinds of fixed and mobile antennas available to enhance your coverage for your two way radio’s long range depending upon your need.

Make sure that the batteries are of good quality for longer use. Battery Analysis and Restoration is available to ensure your equipment is working at its optimum.


If you are looking for a two-way radio system for professional use, both UHF and VHF are great options giving consideration to the range and the environment you need it for.

We have got you covered with a wide range of two-way devices as per your requirement and provide you with an efficient mode of communication. For any two-way radio-related information, reach out to us on 0330 088 7008. We would be happy to help!

Email: hello@digitall-comms.co.uk

Phone: 0330 088 7008

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