Two-way radios for business: network (PoC) or conventional (VHF/UHF)?
When a radio that runs on the cellular network makes sense and when one that talks directly on its own frequency does, what VHF, UHF and DMR mean, and what to check before buying. What we see every day at Cosmos.
“Why a radio and not a cell phone?” We answer that question in almost every review on Lo’ Último en Tech (the episodes linked below are in Spanish). The short answer: you press one button and your whole team hears you at once, with no dialing, no waiting for someone to pick up, and a battery that lasts the whole shift. At Cosmos, radio communication is part of our daily work, and almost every inquiry starts the same way: “which radio should I get?”. It depends on where your people work and on what happens when the signal drops.
1. Two families of radios
Conventional (VHF or UHF). They talk directly from one radio to another on a frequency. They don’t depend on cell service or the internet: if the power goes out or the network goes down, they keep working. Their range depends on the terrain, the antenna and the power, from one to several kilometers; in the COS-D1 review we talk about 3 to 4 km outdoors. To cover more ground, you install a repeater on a high point.
A detail many people don’t know: in the Dominican Republic the frequencies belong to the State, and operating a private radio system requires a license from INDOTEL, the telecom regulator. A serious supplier walks you through the paperwork and hands you the radios already programmed.
Network radios (PoC, push-to-talk over cellular). They look and work like a walkie-talkie, but the voice travels over a carrier’s 4G network with a data SIM (some also over Wi-Fi). They work wherever there is cell coverage: you can talk to someone in Santiago or Punta Cana as if they were next to you, with no repeaters. They usually include GPS, groups, messages and a dispatch console for the office. The trade-off: you pay for a data plan, and if the cell network goes down or gets congested (a long blackout, a storm, an event with thousands of people), the radio goes silent.
2. VHF or UHF
- VHF performs better in open spaces: farms, highways, the coast, open-field construction. The signal travels farther when there are few obstacles.
- UHF performs better in buildings, hotels, hospitals, malls and cities, because it gets through walls and structures better.
If your operation mixes both, go with wherever your team spends most of its time. In the COS-D1 review we explain when each one makes sense.
3. Analog or digital (DMR)
Digital radios (the most common standard is DMR) sound cleaner all the way to the edge of coverage, use less battery and allow two conversations per channel, text messages and more privacy. Analog radios are simpler and cheaper. If you already have an analog fleet, many DMR radios work in both modes, so you can switch little by little.
4. How to choose
- Where does your team work? A single site, a farm or an event: conventional radio. Routes or branches in several provinces: network radio.
- What happens if the power or the signal goes out? If your operation is critical (security, emergencies, large events), keep conventional radios even if you also use PoC.
- How many groups do you need? The models we have reviewed on the channel range from 16 to 48 channels; separate security, maintenance and logistics so they don’t talk over each other.
- How long is the shift? Look at real battery life, not the ad. The radios we have tested range from 1,500 to 3,800 mAh; for long days, get a spare battery or a multi-unit charger.
- Where will it be used? Rain, dust and drops call for a radio with an IP rating and a good grip.
- Accessories: hands-free kits for people who drive or work with their hands full, and clips that hold.
5. What we see fail most often
- Cheap radios bought online, unprogrammed and unlicensed, that end up interfering with others or falling short on range.
- A single badly placed antenna where a repeater was needed.
- Operations that depend only on the cell network with no plan B.
Keep going
On Lo’ Último en Tech we test radios out in the street: the COS-D1, the COS D3, the COS-A1 and the COS-A4. The radios Cosmos sells are on cosmossat.com, and if you’d like help choosing, see the equipment section on the Cosmos page.
