1. the building at its base is --wait for it-- a radio station -part of a group- with studio and admin offices. It is in downtown Columbus at 9th St and Washington St.
2. Yes, I believe there are STL antennas on the tower. I assume each works in duplex (Tx and Rx), if I'm using the term, duplex, right. Thank you for pretty clearly stating that the circular parabolics are likely used for that. One points E to a Greensburg station, which is part of the WRZQ group. The other points N, possibly to a Franklin station???
3. The Yagi fixed link is pretty low (maybe 30' above ground) and seems to point on an E-W axis. Maybe that one monitors the Greensburg station's transmission. I hadn't thought of the need to monitor a distant broadcast, but #4 may explain the Yagi's presence.
4. That STL to Greensburg seems to have been a central concern of the station group owner. He has applied for zoning variances to erect a 200' tower which will replace this 100' tower. His application says something about interruption of service (presumably on this link) and mentions a Fresnel zone problem due to its low height and trees.
5. that rectangular parabolic -the hot dog bun one- remains a mystery (to little old me), so if any of this info is helpful in further deciphering what it may do would be appreciated.
The tower, unfortunately, is located across an alleyway from the backyards of several in-town residences. So the station owner has to seek very substantial zoning variances (required distance from residential) as well as fencing around its base.
The reason I asked for identification help is that the engineering schematic of the tower showed several of these same antennas (but maybe the lower yagi is gone, I don't recall). But the tower schematic shows a large horizontally-oriented array of vertical directional antennas, just like those you see on cellular towers.
I'm assuming that his desire to build a taller tower is not simply to cure his STL service reliability, but also to attract the lease revenue from Verizon, AT&T, etc. It's a wise business strategy, but it's running right up against local community opposition. No one has said anything about it supporting cellular service, only some statement about the owner signing a letter of intent (a FCC req't?) to share the use of the tower.
Here's a fertile section of the planning dept's staff report on the petition for the zoning variances being sought. Any comments would be of interest. Thanks for all the replies!
The petitioner has provided, which is also part of the requirements of Section 6.8 Telecommunication Facility Standards, a letter stating the determination of new tower need. The ordinance states that this letter is necessary to determine that the proposed tower cannot be accommodated on any existing or approved towers or other structures within a 2 mile radius of the proposed tower location.
The petitioner states the need for the tower at this location is because the existing tower is full and cannot accommodate any additional equipment. The new tower will accommodate the five radio stations and the Emergency Alert System broadcast response equipment. The petitioner indicated that this much service cannot be accommodated on any one tower within the 2 mile radius. The radio station and the tower function as one unit that transmits information to another larger, remote tower
that will then send it to through the system (re-transmit) to peoples radios. A cell tower does not broadcast information therefore does not need a point of origin, rather it relays information from one tower to the other. The petitioner also owns a 330 foot tower on Carr Hill Road [T Heller note: this tower and two other, much taller towers lie in the same direction, but fall just barely outside the 2-miles cited.] This tower is used as the receiver of the information that the proposed tower will be transmitting. The proposed tower is needed to send the broadcasting signal to the other taller tower. Additionally, the petitioner states the ordinance was written with cellular towers in mind and cellular towers “relay” information from tower to tower. Radio signals are “different than the intention of the ordinance because its purpose is the ‘dissemination of locally originated content.’ Somewhere down the line, the information is picked up and re-transmitted”.