FBT-400 is an engineered, high-power version of the 400-series coaxial cable, specifically designed for high-temperature and high-reliability environments. While it shares the same physical dimensions as LMR-400, it utilizes a PTFE dielectric and an FEP jacket, allowing it to handle approximately 2x the average power of standard LMR-400.
Key Features
Extreme Temperature Resistance: Rated for operation from -55°C to +150°C, making it suitable for aerospace, military vehicles, and engine compartments.
High Power Capacity: The low-density PTFE dielectric allows for significantly higher power handling compared to standard foam-polyethylene cables.
Plenum Rated & Fire Retardant: The FEP jacket is naturally fire-retardant and meets UL/NEC CL2P ratings for installation in return air plenums (ceilings/floors).
Chemical Resistance: The FEP jacket is chemically inert, providing excellent protection against corrosive fuels, oils, and chemicals.
Technical Specifications
Electrical Property
Value
Impedance
50 Ohms
Velocity of Propagation
76%
Capacitance
26.7 pF/ft (87.6 pF/m)
Max Frequency
6 GHz (Typical)
Shielding Effectiveness
>90 dB
Voltage Withstand
2,500 VDC
Construction Specifications
Component
Material
Diameter
Inner Conductor
Solid Bare Copper Clad Aluminum
0.095" (2.41 mm)
Dielectric
Low Density PTFE
0.285" (7.24 mm)
Outer Conductor
Aluminum Tape
0.291" (7.39 mm)
Overall Braid
Tinned Copper
0.320" (8.13 mm)
Jacket
Brown FEP
0.370" (9.40 mm)
Attenuation & Power Rating (at 25°C)
Note that while FBT-400 has slightly higher attenuation (loss) than LMR-400 due to the solid PTFE dielectric, its power handling is nearly double.
