A two-way radio is called that because it allows a user to both, send and receive voice. One-way would mean only sending or receiving. Two-way radios usually come in sets of two, one person keeps one unit and another person keeps the other one. And now, once set-up, they can both send and receive voice through their units. These units are compact, handheld gadgets that can be also belt-clipped and used hands-free.
A two-way radio communication happens between two persons who use units to exchange messages using the radio frequencies.
Two-way radio communication basics
Let’s try to understand it by breaking it down in simpler things. When you send a message on Facebook, you’re communicating over the internet. When you call someone, you communicate over the cellular network of your service provider. Similarly, when you communicate over the two-way radio, you’re still doing it through a medium: the radio waves.
There’s plenty of infrastructures involved in other kinds of communication. That’s where two-way radios are different. Cellular networks need cell sites or mobile towers full of equipment and antennas. They include digital signal processors, control electronics, transceivers, and so on. The internet uses large servers, cables and optical fibers, routers, and so on. A two-way radio doesn’t need this much infrastructure. It’s reliable without any additional equipment. The cost? It’s not as long-range to enable a cellphone call or Facebook message to travel.
Before we understand how far do two-way radio messages go, here are a few things you should know.
Two-way radios use radio waves, which are regulated but free for the usage by common citizens. There are different channels on the radio waves that you can utilize, with privacy codes, to privately communicate with the other person.
Because two-way radios don’t need an extensive network or infrastructure to function, they are a free way to communicate once you have your units.
How far do they work?
The range of a two-way radio communication channel depends on a variety of factors that affect radio waves and their propagations.
Essentially, obstructions hamper the signal and thus, they limit your ability to send or receive. Below are a few situations that will help you understand things more clearly:
- The longer the antenna, the more region you can cover when sending or receiving.
- If there are obstructions like woods, a hill, or even a dense group of trees, your transmission will cut short by miles.
- The atmospheric noise also plays an important role in how clear the transmission is, if there’s a lot of background noise, then it’s hard to communicate.
- Transmission power sure plays a very important role. The more watts it has, the farther it can send a signal.
With all that said, in an ideal condition with no natural obstructions (like across a large lake, or from a hilltop to another), a typical good-quality two-way radio unit can broadcast and listen to signals about 30-40 miles away. The same radio unit, if it faces large natural obstructions (like communicating in a busy city or across a hill), will be able to send and receive only about a mile or two of transmissions.
Walkie-talkies vs. two-way radios?
Simply put, walkie-talkies are a type of two-way radios. Two-ways radios can be of many kinds like they could be base stations or vehicle-mounted systems. These are more elaborate setups that you can’t just grab and walk with.
The two-way radios that are not mounted, are compact, and usually, handheld is called walkie-talkies. It’s because you can keep talking on those while you walk. Thus, walkie-talkie.
So, a walkie-talkie is always a two-way radio. But two-way radios aren’t always necessarily walkie-talkies.
How and where does one use a two-way radio?
How do you communicate over a two-way radio set? A little bit of setup and a whole lot of talking:
- Turn the radio on and choose the channel. Two-way radio units come with different supports for these channels. Some support fewer than others, but usually above a hundred channels. You’ll find a channel for your usage easily, and if it’s crowded, there’s a privacy code feature too.
- Press the Push-To-Talk (PTT) button (large, often on the side) and after a short pause, you can start speaking what you want to transmit. Keep the button held down/pressed,
- Say “Over” when you’re done and let go of the button.
- A two-way radio unit is always on listening mode with its loudspeaker on (unless there’s a silent button that’s toggled). So, when someone responds to you, you’ll start to hear their voice instantly (radio waves are part of the electromagnetic spectrum, thus these messages travel at light speed).
Where are two-way radios used? It’s common to use two-way radios on construction sites, manufacturing plants, offices, and basically any work-related site that can use some instant, no-cost short-distance communication.
Two-way radios are also extensively used in outdoor activities and adventures like camping, hiking, trekking, hunting, and so on. They are also used in trips to stay in the loop with the group of friends and family that are traveling together.
For example, if you’re going on hiking with a few friends, then all of you should have two-way radio units to communicate as you can’t really fully rely on the cellphone networks, let alone the smartphone in wilderness and remote areas. Many two-way radios are also waterproof against light rain and splashes (some even float on water). Dust-resistance, rugged build, bright colors, etc. make them active communication gadgets for when you’re out in the wild.
There are many things you need to keep in mind to have clear communication. Also, there are certain protocols and a set of etiquettes.
- Only speak when no one else is speaking, because when you press the button, no one else in the group can be heard. So, think before you press the button to speak.
- If you’re part of a large group, identify the recipient.
- Out in the wild or on job sites, your recipient might be busy, so be patient for a response.
- Always wait for a few brief moments before you speak after pressing the button, some words might not get through if you instantly speak up.
- Use these protocol words:
- Over: I’m done.
- Out: Conversation is done, the channel is free for others.
- Say again: Repeat the last message.
- Stand-by: Transmission acknowledged, wait for a response.
- Go ahead: Ready to respond, send the message.
- Roger: Understood.
- Affirmative/Negative: Yes/No.