Rugged LMR-400-DB Dual-Jacket, Direct Burial Coaxial Cable
LMR-400-DB is the ultimate 50 ohm low-loss coaxial cable solution designed specifically for direct burial and underground applications. It combines the superior electrical performance of standard LMR-400 with a specialized, waterproof jacket and sealant, ensuring signal integrity and system longevity in the harshest environments.
Integrated Water-Blocking Gel: Unlike standard LMR, the LMR-400-DB cable core contains a non-toxic, non-flowing waterproofing compound (flooding compound) that fills all internal voids. This completely prevents moisture migration, even if the jacket is compromised.
| Specification | Value |
| Impedance | 50 Ohms |
| Outer Diameter (Nominal) | 0.405 inches |
| Dielectric | Foam Polyethylene (Flooded) |
| Jacket | UV-Resistant PE (Direct Burial) |
| Attenuation at MHz | 3.9 dB per 100 ft (Typical) |
| Outdoor Life Expectancy | 20+ years (When properly sealed) |
| Water Blocking | Yes (Flooded Core) |
Ideal Applications
- Outdoor Wireless Backhaul: Linking Wi-Fi/WISP access points, PtP/PtMP antennas, or remote sensor arrays where aerial runs are impractical.
- Cellular and DAS Infrastructure: Underground jumper cables connecting towers, remote radio units and buried antenna systems.
- Ground-Based GPS/GNSS: Protecting the integrity of sensitive timing signals from moisture and environmental stress.
- Public Safety and LMR: Durable feedlines for buried Land Mobile Radio infrastructure and emergency communication systems.
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