When talk about Practical RF Planning then its also needs to take care about losses and physical losses like Cable,Connector and Combiner at BTS is more important.

Cable Loss

  • Two types of cables are used, main cable and jumper cable.
  • Cable losses are given in per 100feet.
  • Jumper cable has more loss than main cable.
  • Cable loss is also dependant on frequency

cable loss

Connector Loss

  • Connectors used to connect RF components have a typical loss of 0.1dB each.

Combiner Loss

  • A combiner is a device that enables several transmitters of different frequencies to transmit from the same antenna.
  • Two types of combiners are available.
  • Hybrid combiners combine two inputs to one output.
  • Hybrid combiners have a typical insertion loss of 3dB.
  • Cavity combiners combine more input to one output ( typically 5 inputs)
  • Cavity combiners have around 3dB loss.
  • Cavity combiners cannot be used in cells where synthesizer frequency hopping is used.