CT125 serves 75 ohm television and signal-distribution routes where both attenuation and cable size must be considered. Its 1.25 mm bare copper conductor is insulated with foam PE and screened by copper foil and bare copper braid. The nominal overall diameter is 7.80 mm, with PVC or LSOH sheath options. Use the listed attenuation at the operating frequency to assess the cable as part of the complete distribution network.
Inner conductor | Bare copper | Φ1.25 mm |
Dielectric | Foam PE | Φ5.50 mm |
Outer conductor (shield 1) | Copper Foil | Φ5.65 mm |
Shield coverage 1 | 100% | |
Outer conductor (shield 2) | Bare copper braid | 96x0.10 mm |
Shield coverage 2 | 60% | |
Sheath | PVC/LSOH | Φ7.80 mm |
Impedance | 75±5 Ohm |
Nominal capacitance | 50 pF/m |
Velocity of propagation | 85% |
Insulation resistance | >5000 Mohm.Km |
Inner conductor resistance | 12.8 Ohm/Km |
Outer conductor resistance | - Ohm/Km |
Rated temperature | 70°C |
Operating voltage | 30 V |
Cable weight (approx.) | 65 kg/km |
Screening effectiveness | >75 dB (30-1000MHz) >65 dB (1000-2150MHz) |
Frequency(MHz) | Attenuation (dB/100 m) | Attenuation (dB/100 ft) |
50 | 3.5 | 1.07 |
100 | 5 | 1.52 |
200 | 7.5 | 2.29 |
460 | 11.5 | 3.51 |
860 | 15.5 | 4.73 |
1000 | 17 | 5.18 |
1750 | 22 | 6.71 |
2150 | 26 | 7.93 |
5-470 MHz | >23dB |
470-860 MHz | >20dB |
860-2150 MHz | >18dB |
1.25 mm nominal centre conductor and 5.50 mm nominal dielectric diameter.
Copper foil screen and a separate braid with 60% listed coverage.
75±5 ohm impedance with attenuation and return-loss tables.
Check connector dimensions against the conductor, dielectric and finished cable, including the connector supplier’s permitted tolerances. Compare CT125 with the smaller CT100 and larger CT165 at the same frequency and installed length. State indoor or outdoor exposure and the required sheath material, and account for splitters and joints in the total signal-loss calculation.
CT165 Coaxial Cable, 75 Ohm, Foam PE and Dual Copper Screens
RG6 Armoured Coaxial Cable, 75 Ohm, Dual Screen and LSZH Sheath
What distinguishes CT125 from CT100?
The listed CT125 centre conductor and finished cable are larger, and its attenuation is lower at the matching frequencies in these tables.
What is the nominal overall diameter?
The listed diameter is 7.80 mm.
What attenuation is specified at 2150 MHz?
The table gives 26 dB per 100 m at 2150 MHz.
Are PVC and LSOH both listed?
Yes. Specify which sheath is required, along with the installation conditions and relevant fire-performance documentation.
Which connector dimensions need checking?
Use the 1.25 mm centre conductor, 5.50 mm dielectric and 7.80 mm overall nominal diameters when selecting the connector family and confirming its fit.
