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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 multi-wire 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 cover of light-stabilized polyethylene (outdoor installation)

Features:

  • Brand of radiocable - RK 75-3-34M
  • The inner conductor 7x0,20 mm
  • Diameter of insulation 2.6 mm
  • The attenuation coefficient at f=6 MHz and 3.1 dB/100 m
  • Cable size - 12,2x5,5 mm
  • Cable weight - 49 g/m
  • Material outer cover - 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 3,1
10 4,0
50 9,1
100 13,1
200 18,7
470 29,4
862 40,7
1000 44,3
2150 68,3

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
Combo