Any Suggestions - Tunnel RF / repeater coverage

[johnny1225]

We have a application with 10 UHF Repeater Dept want to share coverage in a tunnel is there anyone that has any suggestions.

Thanks in advance

John

[Bruce1807]

what exactly are you trying to do.
i have done mines and underground rail but need some more info of what you are trying to do.

[5-sides]

Yeah, lots of ways to go, but not much info in the OP.

How much territory is involved, how far apart are the freqs, where is the tunnel in relation to the various repeaters, etc., etc.? What will you be using in the tunnel--roving portables, stationary consolettes, mobiles, all of the above? Do you have $$$, or are you trying to do this on the cheap? Is this a simple tunnel, like under a river, or is it more of a tunnel complex like a subway or perhaps even multi-level? All sorts of things to consider.

[smokeybehr]

If you're looking for something like incident response in the tunnel, I'd recommend that you use 1 or 2 separate channels for the tunnel, and have a Radiax-type antenna the length of the tunnel. Those channels will then link to a transciever that will hit the repeaters. If you're just looking for transient coverage for vehicles traveling through the tunnel, then maybe a BDA setup with a beam pointing at the repeater and several unity gain ground planes hung from the ceiling, or the Radiax. It all depends on the frequency and the application. To be more specific, we need more information.