FBT-300 is a specialized, high-temperature coaxial cable within the same family as FBT-400. It is engineered for applications that require a balance between small form factor and high power handling in extreme environments. Like other FBT-series cables, it replaces standard polyethylene with PTFE and FEP to withstand high heat and chemical exposure.
Key Features
High Temperature Rating: Maintains structural integrity and electrical performance in temperatures ranging from -55°C to +150°C.
Compact Low-Loss Design: With a diameter of approximately 0.300 inches, it offers lower loss than smaller cables (like LMR-240) while being easier to route than LMR-400.
Plenum & Fire Safety: The FEP (Fluorinated Ethylene Propylene) jacket is non-toxic and fire-retardant, meeting strict building and aerospace safety codes.
Extreme Durability: Highly resistant to UV radiation, hydrocarbons, and corrosive chemicals, making it ideal for engine compartments or industrial processing plants.
Technical Specifications
Electrical Property
Value
Impedance
50 Ohms
Velocity of Propagation
76%
Capacitance
26.7 pF/ft (87.6 pF/m)
Max Frequency
10 GHz
Shielding Effectiveness
>90 dB
Voltage Withstand
2,000 VDC
Construction Details
Inner Conductor: Solid Bare Copper (0.071" / 1.81 mm)
Dielectric: Low Density PTFE (0.190" / 4.83 mm)
Outer Conductor: Aluminum Tape (0.196" / 4.98 mm)
Overall Braid: Tinned Copper (0.221" / 5.61 mm)
Jacket: Brown FEP (0.300" / 7.62 mm)
Attenuation & Power Rating (at 25°C)
While FBT-300 is smaller than the 400-series, its PTFE dielectric allows it to handle significantly more power than standard PE-based cables of the same size.
