How to Choose Walkie Talkies for Construction Sites (D330, C11, C28 Compared)

A construction site is one of the hardest places on Earth to keep a team connected. It's noisy, it sprawls across open ground and multiple floors, and the signal dies the moment someone steps into a basement or behind a steel wall. Pick the wrong radio and you get missed calls, stalled crews, and safety gaps.

This guide walks through what a job site actually demands, the two radio technologies that matter for construction, and how ETMY's ET-D330 (DMR), ET-C11 (4G PoC), and ET-C28 (4G PoC) map to different site realities.

What a Construction Site Actually Demands

Before comparing models, pin down the four things that break communication on a build:

• Coverage through concrete and steel. Radio waves don't like rebar and poured walls. A site office might have full bars while the foundation pit has none.
• Ruggedness. Dropped radios, dust, vibration, and weather are daily events, not exceptions.
• Whole-crew group talk. Everyone on a trade needs to hear the same call at once — not one-to-one phone calls.
• Worker location. On a multi-acre site, knowing where a crew is (and being able to reach them) is a safety and dispatch issue, not a nice-to-have.

The Two Technologies That Matter Here

Most construction radios fall into one of two camps, and the choice between them drives everything else.

DMR (digital two-way radio) — e.g. ET-D330. DMR talks on its own radio frequency. It does not need a cellular network, a SIM card, or a data plan. That makes it the right call for basements, remote sites, and any location where 4G doesn't reach. Its range is set by terrain and, on large plots, by adding a repeater.

4G PoC (Push-to-Talk over Cellular) — e.g. ET-C11, ET-C28. PoC rides the mobile network instead of radio waves, so coverage follows the 4G signal rather than line-of-sight. That's a huge advantage for large or multi-site projects: a supervisor across the city is still one button-press away. Because it runs on the network, PoC radios can carry GPS location for dispatch and roll-call, but they do need a SIM and a data subscription.

The short version: DMR wins where there's no signal; PoC wins where there's a network and you want location + reach.

Meet the Three ETMY Models

### ET-D330 — The On-Site DMR Workhorse

Best when the site has weak or no cellular, or when you need comms that never depend on a carrier. It delivers reliable on-site and campus coverage and extends across a large plot when paired with a repeater.

Reach for it when: you're coordinating crews in basements, underground levels, or remote builds; safety leads and foremen need comms that simply can't drop with the network.

### ET-C11 — The Connected PoC for Dispatch

Best for larger or multi-site projects where GPS tracking and dispatch matter. Dual SIM keeps you on the strongest carrier, and the 4G backbone means HQ can reach a crew anywhere the network reaches.

Reach for it when: project managers, logistics, and fleet coordinators need to see where teams are and push calls across sites or cities.

### ET-C28 — The Everyday PoC

Same 4G push-to-talk backbone as the C11, positioned for simple, affordable crew-wide comms. It's the way to put a radio in every pair of hands without over-spec'ing.

Reach for it when: general labor crews and subcontractors just need cheap, reliable one-button talk across the site.

How to Decide (Quick Framework)

1. No or weak cellular on site? → ET-D330 (DMR) — comms that don't depend on a carrier.
2. Need GPS + multi-site dispatch? → ET-C11 (PoC) — location and city-wide reach.
3. Just want affordable crew-wide talk? → ET-C28 (PoC) — simple push-to-talk for everyone.
4. Mix of both? Run DMR on-site for the field and PoC for mobile supervisors, then bridge the two with a gateway.

Not sure which technology fits your environment? Our DMR vs 4G PoC breakdown lays out the trade-offs in detail.

Bottom Line

There's no single "best" construction radio — only the one that matches your coverage reality and coordination needs. For a model-by-model spec comparison of the D330, C11, and C28, see our three-model buying guide.

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