Description
Low-Loss 50-Ohm Coaxial Cable — LMR400-Type Alternative — Sold Per Foot
The Atlantic Radio ATL400 is a professional-grade, low-loss 50-ohm coaxial cable sold by the foot for custom-length antenna feed line runs. The ATL400 is a high-quality alternative to LMR400-type cable, offering comparable — and in many cases superior — electrical and mechanical performance at a competitive price point. It is engineered to provide outstanding signal quality with minimal signal loss, making it ideal for applications that demand reliable and efficient transmission.
Constructed with a solid copper-clad aluminum (CCA) center conductor, foamed polyethylene insulation, bonded aluminium foil first outer conductor, and a tinned copper braid second outer conductor, the ATL400 is jacketed in a UV-resistant polyethylene outer jacket rated for 20 years of outdoor service. It offers superior bending and handling characteristics compared to air-dielectric and corrugated hard-liner cables, making it easier to route and install in vehicle, facility, and tower environments. Adjust the quantity at checkout to the total number of feet required.
* LMR™ is a trademark of Times Microwave Systems.
Key Features & Benefits
LMR400-Type Performance: A direct alternative to LMR400 — same if not better electrical performance including attenuation, impedance, and velocity ratio.
Outstanding Signal Quality: Engineered for minimal signal loss with >90 dB screening factor from 1–1,000 MHz, ensuring reliable and efficient transmission.
20-Year Outdoor Service Rating: UV-resistant polyethylene jacket designed for long-term outdoor installations without degradation.
Superior Handling vs. Hard-Line Cables: Significantly easier to bend, route, and install compared to air-dielectric and corrugated hard-liner cables, with a minimum bending radius of 25.4 mm.
Solid CCA Center Conductor: Copper-clad aluminum construction balances conductivity and weight for efficient signal delivery.
Dual-Layer Shielding: Bonded aluminium foil + tinned copper braid provides >90 dB screening factor, minimizing interference and signal leakage.
Wide Temperature Range: Rated -40°C to +85°C for reliable performance in demanding outdoor and in-vehicle environments.
Sold Per Foot: Order the exact length needed — set quantity equal to the number of feet required at checkout.
Typical Applications
- Antenna feeder runs (mobile, base station, repeater)
- Telecom and broadcasting infrastructure
- Two-way radio systems
- Wireless LANs & Wi-Fi antenna extensions
- Inter/intra cabinet jumper cables
Physical Specifications
| Parameter |
Specification |
| Center Conductor |
Solid Copper-Clad Aluminum (CCA) |
| Conductor Diameter |
2.74 mm (± 0.02 mm) |
| Min. Break Strength |
640 N |
| Insulation |
Foamed Polyethylene |
| Insulation Diameter |
7.39 mm (± 0.10 mm) |
| Insulation Color |
Neutral |
| Centricity |
≥ 90% |
| Insulation Adhesion |
10 N to 100 N @ 25 mm |
| 1st Outer Conductor |
Bonded Aluminium Foil |
| 1st Outer Overlapping |
≥ 115% |
| 1st Outer Diameter |
7.39 mm (± 0.10 mm) |
| 2nd Outer Conductor |
Tinned Copper Braid |
| Braid Wire Diameter |
0.15 mm (± 0.01 mm) |
| Number of Wires |
192 |
| Braid Coverage |
95% (± 3%) |
| Outer Jacket |
UV-Resistant PE |
| Outer Diameter |
10.29 mm (± 0.01 mm) |
| Tensile Strength |
≥ 16.2 N/mm² |
| Elongation at Break |
≥ 700% |
| Jacket Adhesion |
20 to 80 N @ 50 mm |
| Min. Bending Radius |
25.4 mm |
| Max. Pulling Tension |
740 N |
| Crush Resistance (700 N load) |
< 1% deformation |
| Outdoor Service Life |
20 Years (UV-resistant jacket) |
| Operating Temperature |
-40°C to +85°C |
Electrical Specifications
| Parameter |
Specification |
| Characteristic Impedance |
50 ± 3 ohm |
| Capacitance |
78 ± 3 pF/m |
| Velocity Ratio |
> 85% |
| DC Resistance — Center Conductor |
< 4.60 ohm/km |
| DC Resistance — Outer Conductor |
< 5.40 ohm/km |
| Peak Power Rating |
16.00 kW |
| Cut-Off Frequency |
16.20 GHz |
| Insulation Resistance |
> 5,000 MΩ·km |
| Dielectric Strength |
1,600 VAC |
| Voltage Withstand |
2,500 VDC |
| Screening Factor (1–1,000 MHz) |
> 90 dB |
Attenuation & Power Rating by Frequency
| Frequency (MHz) |
Attenuation at 20°C (dB/100 ft) |
Avg. Power (kW) |
| 30 |
0.67 |
3.33 |
| 50 |
0.88 |
2.57 |
| 100 |
1.31 |
— |
| 150 |
1.52 |
1.47 |
| 220 |
1.86 |
1.20 |
| 450 |
2.71 |
0.83 |
| 900 |
3.90 |
0.58 |
| 1,500 |
5.12 |
0.44 |
| 1,800 |
5.67 |
0.40 |
| 2,000 |
5.97 |
0.37 |
| 2,500 |
6.77 |
0.33 |
| 3,000 |
7.62 |
— |
| 5,800 |
10.80 |
0.21 |
Ordering Instructions
The ATL400 is sold by the foot. Set the quantity at checkout to the total number of feet required. For custom termination, connector installation, or bulk pricing, contact Atlantic Radio Communications before ordering.
More Resources
Frequently Asked Questions
Is the ATL400 the same as LMR400?
The ATL400 is Atlantic Radio’s private-label equivalent to LMR400-type coaxial cable and meets or exceeds LMR400 electrical and mechanical specifications. The impedance, velocity ratio, attenuation characteristics, conductor construction, and jacket materials are all equivalent to or better than standard LMR400. If you’ve been using LMR400, the ATL400 is a direct drop-in replacement.
How long will ATL400 last outdoors?
The ATL400 is designed for 20 years of outdoor service. Its UV-resistant polyethylene jacket resists degradation from sunlight, moisture, and temperature cycling, making it suitable for permanent outdoor antenna installations without additional jacketing or conduit in most applications.
How does ATL400 compare to hard-line coaxial cable?
The ATL400 offers superior bending and handling characteristics compared to air-dielectric and corrugated hard-liner cables. While hard-line cables can offer lower loss over very long runs, they are rigid, difficult to route, and require specialized connectors. The ATL400 is significantly easier to install in vehicle, facility, and tower environments while still delivering low-loss performance suitable for the vast majority of two-way radio applications.
What connectors are compatible with ATL400?
The ATL400 accepts all standard LMR400-compatible connectors including PL-259, N-type, SMA, BNC, and TNC in both crimp and solder configurations. Connector compatibility is determined by the 10.29 mm outer diameter and 2.74 mm center conductor. Contact Atlantic Radio Communications for connector installation or terminated cable assemblies.
What is the minimum bending radius?
The minimum bending radius for the ATL400 is 25.4 mm. Exceeding this radius during installation can degrade electrical performance and damage the cable structure.
Warranty
The Atlantic Radio ATL400 is backed by a 1-year warranty against manufacturing defects. Contact Atlantic Radio Communications for warranty claims or support inquiries.
