Losses in the line

The electrical resistance (nonnull) of the drivers constituting the line and the insulation (noninfinite) of dielectric, cause a progressive weakening of the amplitude of the wave traversing the line.

These losses have a double disadvantage:

  • weakening of the received signal and reduction in the sensitivity of the system of reception.

  • reduction of the power transmitted to the antenna by the transmitter.
On-line losses are expressed in dB/m (decibel/meter length) and depend on many factors:

  • natural of dielectric (matter, form, etc) the

  • standard of line (two-wire or coaxial)
  • work frequency

Example: a very common coaxial cable (ref. RG58A) a 30 meters length presents 6  dB of losses to 130  MHz. If one applies a power of 100 Watts to the entry of this line, one will find only 25 Watts at his end. With 6  MHz, the loss is only of 1 decibel.

See too

Internal bonds

  • Propagation waves radio

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