Feature photo courtesy of and copyright Free Range Stock


We live in an age of constant technological advancement, so it is no wonder that even two way radios have gone digital.

One product, we’re specifically excited about, is the Vertex Standard EVX-Link. This little box of magic, makes it possible to extend your digital two way radio network as far as you want it to go, without the need to invest in various repeater towers, antennas, etc.

In addition to such innovative accessories, if you compare an analog two way radio with a digital two way radio, you’ll notice that the digital radio’s audio quality is also much better – not only because it doesn’t gradually deteriorate the further your radio users move from away from each another, but also due to a crisper sound and less background noise.

The increased static you’ll hear on an analog two way radio the farther out you go, might be quite obvious (we’re talking RF signals here), but as for the rest, we’ll let Bearcom explain why:

With analog two-way radios, the natural human voice is carried by radio signals. You can hear the person’s voice exactly as it sounds, and interference, obstacles, and coverage limitations can significantly degrade quality. In contrast, digital radios create an electronic version of our voices. The vocoder inside the radio converts traditional analog voice signals into positive and negative binary signals, and transmits this digital information to the other radio. Then the vocoder on the other end translates the signal back to an analog voice, so the signal goes from analog to digital and back to analog.

One of the major shortcomings of an analog radio system is that once you push the button to talk, you’re speaking into an open microphone that picks up any nearby noises and transmits them along with your voice. A digital radio is designed to do a much better job of filtering out background sounds that can clutter analog transmissions. The vocoder essentially knows how to turn up the human voice and turn down everything else. That’s because the vocoder has been programmed to identify the sound of people talking.

Trunking is a cost effective radio communication technique that makes communication significantly easier and more effective than traditional radio communication methods systems such as ComReps (Community Repeaters), where different users operate on separate radio frequencies or radio channels.

A challenge with traditional radio systems is that the number of channels is often exceeded, whilst radio trunking smartly controls and guides the users toward a free channel, thereby reducing waiting times.

The principal of trunking is based on automatic and dynamic allocation of a small number of radio channels among a large number of radio users in the most efficient and transparent way.  Finding a free channel is therefore not the user’s obligation as the system does it automatically and in the shortest possible time.  Trunking therefor permits a large number of users to share a relatively small number of communication channels.

This process is managed through tried and tested control equipment and the entire allocation process is transparent to the individual user.  Radio trunking enables a dispatcher to be in instant contact with vehicles in the fleet as trunking optimises resources to reduce queues and speed up channel allocation.

Source: What is Trunking? | Altech Fleetcall

By DRS Support & Admin / Commercial Radios / / 0 Comments

The commercial radio band is mainly divided into VHF (Very High Frequency [longer wave lengths, longer distance]) and UHF (Ultra High Frequency [shorter wave lengths, shorter distance]), but if you’re buying your very first two way radio, these terms are probably more confusing than helpful.

We could probably simplify things by stating that VHF is usually suitable for any scenario where line-of-sight is possible (outdoor, no obstructions), whereas UHF works well indoors and between buildings; and although we wouldn’t exactly be wrong, we do recommend National Instruments’ RF tutorial as additional reading material for you.


This is probably the most frequent (if not the first) question posed to members of the two way radio community. We wish we could give you a clear-cut, rule-of-thumb type of answer so that you can apply it to every communication scenario, but due to the way two way radio frequencies work, there are simply too many factors at play.

What we can do for you, in today’s blog post, is to give you a rundown on the most important facts to consider when trying to pinpoint which two way radio solution will work best in your environment / set up.

  • A fair distance expected from a standard VHF/UHF commercial two way radio, is about 1 – 2 km.
  • The ideal (optimal) area would most probably be one with perfect line of sight, in other words, an area in which there are no peaks / buildings / structures obstructing the view between two users.
  • Contrary to a common misconception, the range of analog and digital radios are the same. The only difference is that analog radios’ audio quality will continue to decrease gradually the farther away one user get from another, whereas the digital radios’ sound will remain just as crisp and clear until range is eventually lost (it will cut out as soon as range is lost).

You can, of course, purchase additional equipment to extend your reach. Renting or purchasing a repeater, with its own duplexer and antenna mast (usually a dipole antenna on top of a aluminium pole), used to be your only two options; but thanks to Vertex Standard, if you have a digital network, you can now also link your sites/users via an internet line and their new EVX-Link system.

EVX-Link Example 1EVX-Link Example 2EVX-Link Example 3

However, in conclusion, if you need a communication solution, and you’re not sure whether a two way radio could seal the deal, give our Sales Team a call on 0861 326 6774, or send us a message with your contact info via sales@digitalradiosolutions.co.za and we’ll call you.


A walkie talkie (sometimes also referred to as a handheld transceiver, HT, two way radio, or just a portable) is a hand-held, portable, two-way radio transceiver.

They were originally developed during World War II and everything about their design was initially geared towards the needs of armed forces, but after the war, they also spread into the public safety sectors (eg. police departments) and was eventually also used commercially.Stacy Bravo notes that, over the years, with the advancements of technology, walkie talkies have often times been overlooked as a necessity in today’s world and thinks that everyone in every household should have a set.

To find out why, read the Source Article: Why You Should Carry Walkie Talkies


By DRS Support & Admin / Uncategorized / / 0 Comments

We can hardly believe that this ride, this Two Way Radio Adventure, has been going on for a year now!

It has been an absolute delight making new acquaintances in the Events Management and Security Sectors. We are thrilled about the opportunities lying in wait.

Thank you for your support and encouragement so far.

Looking forward to doing more business with you!