Post
by BigRed » Wed Sep 07, 2016 10:28 am
Need a tad more information to even venture a guess . . .
1st, "STL" (Studio-Transmitter Link) implies point-to-point communications with a directional antenna like the ones shown in your photo. What direction will the antenna be pointing?
2nd, 313.5 mHz is a rather low frequency for an STL,, at least in the States (are you in the States?). [We do have, or used to have a TSL band (Transmitter-Studio-Link) down in the 500-mHz range as I remember.] That's a pretty low frequency for a parabolic reflector (although quite possible). Chances are you will be using a log-periodic antenna or a yagi, something like is available from Kathrein Scala (log- periodic's and yagi's are pretty much the same animal from a physical viewpoint)?
3rd, is there any vacant space around that parapet that isn't shown in the photo? With a log-periodic or yagi a simple vertical pipe should suffice. If you can't find space to install a vertical support of your own you can always extend one of the existing vertical pipes a bit to create a space for your antenna, so long as you secure permission from the owner of the existing vertical and doing so doesn't violate any rules or laws. You will also have to maintain appropriate distances from neighboring antennas. (That depends on the antenna types and operating frequencies.)
4th, as a courtesy you should check with all of the existing services to see if there's any chance you will cause them interference. (There's software out there that can be a good start for making that assessment.) And remember, if your new installation does cause interference to already existing services you will be obligated to mitigate that (morally, if not also legally), even to the point of shutting down your STL.
Good luck!