LMR-400-75 is the 75 ohm version of the LMR-400 cable.
LMR-400-75 cable is a Flexible Low Loss, 75 ohm Coaxial cable, supplied in any length – manufactured by Times Microwave Systems and available from McGill Microwave – Authorised Distributor of all Times Microwave products.
LMR-400-75 Coaxial cable is a very popular product within the Times Microwave LMR coaxial cable range. The LMR range is recognised globally as the industry standard ultra low loss, flexible, low cost, lightweight, DC – 6GHz coaxial cable solution for many RF applications. This is also backed up by the best warranty and technical support in the business.
Why choose LMR-400-75?
LMR-400-75 is the most popular coaxial cable in the industry due to its excellent reliability, unsurpassed flexibility and ultra low attenuation. The LMR-400-75 cable has loss figures comparable to the extremely rigid corrugated coaxial cables however manages to achieve similar flexibility to that of high loss RG Cables.
How is the LMR-400-75 low loss figures achieved?
This is achieved due to the cable construction specifications. The centre conductor uses a high conductivity, Bare copper clad covered aluminium centre conductor material. The dielectric is nitrogen injected, foamed, closed cell, Polyethylene which helps achieve 84% Velocity of Propagation. The Dielectric has a Aluminium foil outer conductor, which is chemically bonded on to it. Due to the cable construction, The attenuation is significantly lower as compared to single shielded coaxial cables.
Outer Jacket
All standard LMR coaxial cable comes with a UV resistant, PE Jacket. This helps to ensure the cable jacket can withstand harsh outside environments and UV rays from sunlight, this is designed to last for up to 20 years of outdoor service.
Frequency Operating Band
LMR-400-75 is designed to operate excellent from DC – 6GHz. For any frequency band at VHF and above LMR is the obvious choice.
Should you find your RF system operates at above 1GHz, LMR is once again, your best option, as RG cable typically isn’t compatible with any frequency in excess of 1GHz.
LMR-400-75 Flexible Low Loss Communications Coaxial Cable is ideal for:
- Satellite Applications
- VSAT applications
- Video applications such as CCTV, CATV, baseband or broadband
- In-Building Feeder Runs
- Any 75 ohm Wireless Application requiring an easily routed cable
Attenuation dB figures per 100m Mechanical Specifications Temperature range: -40⁰C – +85⁰C
30 MHz : 2.1dB Bend Radius: installation 25.4mm Inner Conductor: Solid BCCAI (1.65mm) 50 MHz : 2.7dB Bend Radius: repeated 101.6mm Dielectric: Foam PE (7.24mm) 150 MHz : 4.8dB Bending Moment: 0.68Nm Outer conductor: Aluminium tape (7.39mm) 220 MHz : 5.8dB Weight lb/ft 0.10 Kg/M Overall Braid: Tinned copper (8.13mm)450 MHz : 8.4dB Tensile Strength 72.6 Kg Jacket: Black PE (10.29mm)900 MHz : 12.1dB Flat Plate Crush: 0.71Kg/mm1500 MHz : 16.0dB2500 MHz : 21.1dB
Electrical Specifications
Max Operating Frequency: 2.5GHz
Velocity of Propagation: 85%
Dielectric Constant NA 1.38
Impedance ohms 75
Capacitance pF/ft (pF/m) 15.9 (52.3)
Inductance uH/ft (uH/m) 0.090 (0.29)
Shielding Effectiveness dB >90
DC Resistance
Inner Conductor ohms/1000ft (/km) 2.50 (8.20)
Outer Conductor ohms/1000ft (/km) 1.65 (5.4)
Voltage Withstand Volts DC 2000
Jacket Spark Volts RMS 5000
Peak Power kW 10
LMR® is a registered trademark of Times Microwave Systems
