We're using Aaxeon ethernet-to-fiber converters. With some creative wiring you can run DC with sync up the tower via cat5 alongside fiber for data. Simpler is DC and fiber up the tower and sync injection with GPS at the top with the APs. (for a single AP - like a test - its simpler to just use a timing-port sync injector beside the AP)
But the fiber experiment came first, then we rewired a smaller FM tower (180ft) using the ferrite toroids and were pleased, so we redid the 400' tower with the toroids and will probably not bother switching to fiber. Now that we're successful avoiding induced problems via ethernet from the FM transmitter, the only impetus for switching to fiber is to get CMMs and router and POEs in a shed at the base of the tower instead of 200ft up the tower. (and the primary decider on that is the same guy who climbs that particular tower most of the time - he seems just as happy to climb for infrequent problems rather than the extensive climbing and recabling entailed in switching to fiber all around in order to move control/power to the bottom)
j
But the fiber experiment came first, then we rewired a smaller FM tower (180ft) using the ferrite toroids and were pleased, so we redid the 400' tower with the toroids and will probably not bother switching to fiber. Now that we're successful avoiding induced problems via ethernet from the FM transmitter, the only impetus for switching to fiber is to get CMMs and router and POEs in a shed at the base of the tower instead of 200ft up the tower. (and the primary decider on that is the same guy who climbs that particular tower most of the time - he seems just as happy to climb for infrequent problems rather than the extensive climbing and recabling entailed in switching to fiber all around in order to move control/power to the bottom)
j