Combined cables intended for the transmission of television signals in video surveillance systems with simultaneous connection of power and/or transmit control signals.
For external cabling.
It consists of a radio frequency cable and power supply wires, united under a single sheath.
RF cable:
- with solid copper inner conductor
- with insulation of foamed polyethylene
- with the external conductor in the form of a braid of copper wire
Cores power and a common cable sheath:
- power supply cores of 0.50 sq. mm cross-section
- in the common sheath of light-stabilized polyethylene (outdoor installation)
Features:
- Brand radiocable - RK 75-3-32
- Inner conductor - 1x0. 60 mm
- Insulation diameter - 2.7 mm
- The attenuation coefficient at f=6 MHz and 2.9 dB/100 m
- Outer cable diameter - 9 mm
- Cable weight - 58 g/m
- Outer sheath material - light-stabilized polyethylene
- Electrical resistance of conductors to direct current at 20 ° С and a length of 1 km - not more than 40.5 Ohm / km
The electrical characteristics of radiocable:
- Impedance - 75 Ohm
- Electric cable capacitance - 56 pF/m
- Coefficient of shortening of the wave length of 1.22
- The coupling resistance is 110 mOhm/m
- The speed of propagation of the wavelength - 82%
Attenuation coefficient:
Frequency, MHz | Coefficient attenuation, dB/100 m |
6 | 2,7 |
10 | 3,5 |
50 | 7,9 |
100 | 11,4 |
200 | 16,3 |
470 | 25,5 |
862 | 35,3 |
1000 | 38,4 |
2150 | 58,7 |
Operating conditions - from minus 60° to plus 70°C.
Resistant to high humidity 98% at temperatures up to 35°C, under conditions of installation bending or minus 15°C.
Resistant to sunlight, frost.
Resistant to bends (not less than 10 bends at an angle of +/-90° if the radius of the bend, equal to ten maximal external diameter of the cable).
The service life of the cables is 25 years.
Cables - characteristics:
Cable sort
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Combo
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