Coax

? ☆ ?? characteristic impedance of 75Ω ?? ?? ☆ ?? single or multiple conductor stranded bare copper ?? ?? ☆ ?? solid polyolefin insulation foil shielding ?? ?? ☆ ?? ?? ?? ☆ ?? soft copper or tinned copper braid shield PVC jacket ?? ?? ☆ ?? ?? ?? ☆ ?? ?? range of applications suitable for use at -25 ℃ ~ -70 ℃ conditions: ? ???????? applies to 1GHz below the analog signal and high-rate digital signal transmission, the transmission fixed or mobile radio communications and electronic devices employing similar techniques in signal, television, radio signal transmission and control and information have applied to a common antenna, CCTV systems, radio communications, transmission system and one-way control or high frequency machine internal wiring. Implementation of the standards: ????????? GB / T 14864-1993 ??? number of model specifications within the standard dielectric sheathed conductor structure mm Maximum conductor resistance at 20 ℃ Ω / km insulation resistance of not less than Ω / km thickness mm diameter mm Thickness mm OD mm 1 75-2 (2.5C-2V) 1 / 0.40 0.8 2.40 ± 0.13 0.4 4.00 ± 0.20 145 5000 2 75-2 (2.5C-2V) 8 / 0.12 0.8 2.40 ± 0.13 0.4 4.00 ± 0.20 22.6 5000 3 75-3 (3C-2V) 1 / 0.50 1.05 3.00 ± 0.13 0.6 5.10 ± 0.20 91.4 5000 4 75-3 (3C-2V) 9 / 0.15 1.05 3.00 ± 0.13 0.6 5.10 ± 0.20 22.9 5000 5 75-5 (5C-2V) 1 / 0.80 1.7 4.80 ± 0.13 0.7 7.20 ± 0.20 33.4 5000 6 75-5 (5C-2V) 12 / 0.20 1.7 4.80 ± 0.13 0.7 7.20 ± 0.20 48.2 5000 7 75-7 (7C- decay constant 2V) 1 / 1.15 2.68 7.25 ± 0.13 0.84 10.00 ± 0.20 18.5 5000 8 75-7 (7C-2V) 7 / 0.40 2.64 7.25 ± 0.13 0.84 10.00 ± 0.20 21.2 5000 No. Model Specification decay constant characteristic impedance Ω 20 ℃ when ≤dB / 100m 1MHz 5MHz 10MHz 15MHz 20MHz 30MHz 50MHz 100MHz 200MHz 1 75-2 (2.5C-2V) 75 ± 3 2.40 5.30 7.30 8.60 9.90 11.80 15.20 20.90 29.80 2 75-3 (3C-2V) 75 ± 3 1.90 4.30 5.90 7.00 8.10 9.50 12.40 17.00 24.30 3 75-5 (5C-2V) 75 ± 3 1.30 2.80 3.80 4.50 5.20 6.10 8.00 11.00 15.80 4 75-7 (7C-2V) 75 ± 3 0.80 1.90 2.60 3.10 3.50 4.20 5.50 7.60 11.00