DMR Radio & Repeater Network for Construction Fleet

DMR Tier II digital radio system — 500 mobile / portable radios plus an on-site digital repeater network — keeping a mountain-road construction project connected across a site with no cellular coverage.

Client Background

A Central Asia road contractor with a construction zone tens of kilometers long spread through mountain terrain, with no mobile signal across most of the site.

Challenges

1. No cellular coverage across the site; staff and machinery out of touch
2. Needed group dispatch and one-key emergency alarm for safety
3. Dust, shock and harsh outdoor conditions year-round
4. Fleet spread over long distances — portable-to-portable range was not enough

Our Solution

1. Radios: DMR Tier II (ETSI TS 102 361), 2-slot TDMA, tuned to the client’s licensed UHF 400–470 MHz frequencies; IP66 rating; ~14 h battery in digital duty cycle; VOX headset support; clone cable for fleet-wide configuration
2. Coverage: digital repeater with high-gain antenna on the site’s hilltop tower, extending the network across the whole zone; GPS-optional handhelds with man-down (tilt) emergency alert
3. Deployment: frequency plan, on-site survey and commissioning support; spare battery + charger kits per vehicle

Results & Outcomes

• Stable whole-site voice coverage after repeater commissioning (previously dead zones)
• Group dispatch + one-key emergency alert in daily use; two man-down alerts handled in the first quarter
• 500-unit order delivered on schedule across 3 shipments
• Sample lead time 10 days; mass production 30 days

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