Description
Low-Loss 50-Ohm LMR400-Type Coaxial Feedline Cable — Sold Per Foot
Commercial-grade low-loss 50-ohm antenna feedline cable engineered as a drop-in LMR400-type alternative with dual-layer shielding and a 20-year UV-resistant outdoor jacket.
The Purchase Radios PR400 is a professional-grade, low-loss 50-ohm coaxial cable sold by the foot for custom-length antenna feedline runs. Sourced directly from our verified inventory of Two-Way Radio Cables, the PR400 serves as a direct drop-in alternative to LMR400-type coaxial cable, delivering comparable—and in many parameters superior—electrical and mechanical performance for mission-critical two-way radio, repeater, and wireless infrastructure installations. Engineered for minimal signal attenuation and >90 dB RF shielding, it ensures maximum transmitter power reaches the antenna while preserving weak uplink receiver signals.
Constructed with a solid copper-clad aluminum (CCA) center conductor, gas-foamed polyethylene insulation, a bonded aluminum foil first outer conductor, and a 95% coverage tinned copper braid second outer conductor, the Purchase Radios PR400 is encased in a UV-resistant polyethylene outer jacket rated for 20 years of outdoor service. Unlike rigid air-dielectric and corrugated hard-line cables, the PR400 offers a tight 25.4 mm minimum bending radius and smooth flexibility for straightforward routing through vehicles, equipment cabinets, building risers, and antenna towers. Adjust the quantity at checkout to match the exact total number of continuous feet required for your installation.
(Note: LMR™ is a trademark of Times Microwave Systems.)
Key Features & Benefits
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Direct LMR400-Type Drop-In Alternative: Matches standard LMR400 electrical and physical specifications—including 50-ohm impedance, >85% velocity ratio, and 10.29 mm outer diameter—for seamless connector and system compatibility.
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Outstanding Low-Loss Signal Integrity: Engineered for minimal attenuation across VHF, UHF, 700/800/900 MHz, and 2.4/5.8 GHz bands with a >90 dB screening factor from 1–1,000 MHz.
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20-Year Outdoor UV Service Rating: Heavy-duty UV-stabilized polyethylene jacket resists sunlight, moisture, and temperature cycling without cracking or requiring secondary conduit.
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Superior Handling vs. Hard-Line Cables: Routes easily around tight corners and conduit sweeps with a 25.4 mm minimum bending radius, avoiding the installation complexity of rigid corrugated hard-line coax.
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Solid Copper-Clad Aluminum (CCA) Center Conductor: 2.74 mm CCA core balances high-frequency skin-effect conductivity with reduced cable weight for vertical tower and mast runs.
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Dual-Layer Foil & Braid Shielding: Bonded aluminum foil (≥115% overlap) paired with a 192-strand tinned copper braid (95% coverage) blocks electromagnetic interference and prevents RF leakage.
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Wide -40°C to +85°C Operating Range: Performs reliably across extreme sub-zero winter conditions and high-heat rooftop or engine-compartment environments.
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Sold Per Foot for Custom Runs: Order the exact continuous footage needed by setting the checkout quantity equal to your required length in feet.
Typical Applications
- Antenna feeder runs (mobile, base station, and repeater systems)
- Commercial and public safety two-way radio infrastructure
- Telecom, BDA/DAS in-building distribution, and broadcasting networks
- Wireless LANs, WISP, and Wi-Fi antenna extensions
- Inter-cabinet and intra-cabinet RF jumper assemblies
Physical Specifications
| Parameter |
Specification |
| Brand |
Purchase Radios |
| Model / SKU |
PR400 |
| 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 Aluminum 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 Polyethylene (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 (-40°F to +185°F) |
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 Purchase Radios PR400 is sold by the foot as bulk unterminated coaxial cable. Set the quantity at checkout to the total number of continuous feet required for your feedline run. For custom connector termination, pre-assembled jumper lengths, or bulk spool orders, contact Atlantic Radio Communications before placing your order.
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Frequently Asked Questions
Is the Purchase Radios PR400 the same as LMR400?
The Purchase Radios PR400 is Purchase Radios’ private-label equivalent to LMR400-type coaxial cable and meets or exceeds LMR400 electrical and mechanical specifications. Its 50-ohm impedance, >85% velocity ratio, attenuation curve, 2.74 mm CCA conductor construction, dual-layer shielding, and 10.29 mm UV-resistant polyethylene jacket make it a direct drop-in replacement for LMR400.
How long will Purchase Radios PR400 last outdoors?
The PR400 is engineered for 20 years of outdoor service. Its UV-resistant polyethylene outer jacket resists degradation from ultraviolet exposure, rain, humidity, and extreme temperature cycling (-40°C to +85°C), making it suitable for permanent exterior mast, tower, and rooftop feedline installations without additional conduit in most deployments.
How does PR400 compare to hard-line coaxial cable?
The PR400 provides substantially better bending and routing flexibility compared to air-dielectric and corrugated hard-line coaxial cables. While thick hard-line cables are used on ultra-long multi-hundred-foot tower runs, they are rigid, labor-intensive to route, and require specialized connectors. The PR400 installs quickly in vehicles, buildings, and towers while delivering low-loss performance ideal for two-way radio, repeater, and wireless systems.
What connectors are compatible with Purchase Radios PR400?
The PR400 accepts all standard LMR400-compatible RF connectors—including Type-N, PL-259 (UHF), SMA, BNC, and TNC—in both crimp and solder styles, matched to its 10.29 mm outer jacket diameter and 2.74 mm center conductor. Contact Atlantic Radio Communications if you need custom factory-terminated cable assemblies.
What is the minimum bending radius for installation?
The minimum single-bend radius for the Purchase Radios PR400 is 25.4 mm (1.0 inch). Avoiding bends tighter than 25.4 mm during installation prevents dielectric compression, preserves 50-ohm impedance matching, and maintains low VSWR performance.
Warranty
The Purchase Radios PR400 is backed by a 1-year manufacturer’s warranty against defects in materials and workmanship. Contact Atlantic Radio Communications for warranty claims or technical support inquiries.
