I don't think I've ever seen an amplifier along a leaky coax system. Since the holes in the coax are 2-way, the downstream amp would also amplify anything that leaked INTO the coax before it. That would cause lots of interference as well as oscillation from the output of the amp to the input.
Now, if it was solid coax from the antenna to the in-line amp, I could see that working. I think most systems today use fiber to get to the new RF source that would then feed indoor antennas or leaky coax. So, one outside antenna, RF to light on many fiber strands. In the tunnel, as one leaky coax runs out of signal, another strand of fiber (or optical directional coupler) would start another span of leaky coax. Again, I could be wrong about the re-amplification, just never seen a system like that myself. Ray --- In [email protected], "kabjik777" <kabjik...@...> wrote: > > Dear all, > I am a student currently researching on radiating leaky coaxial cables. > I do understand that in long tunnels where radiating leaky coaxial > cables are used, repeaters are placed at various points of the cable. > > I want to know what is the average distance between the repeaters. > I will be glad if somone tell me or share a link with information as > regards to this. > > I will also like to know the acceptable signal degradation per km? > for example is it 15dB/km or 13dB/km? > > Thanks in advance. > Bansoboy. >
