James Muir immediately wrote in with the following: I remember the Killin site being commissioned around 1980 and I recollect that there were protracted "engineering problems" at that time with the quality of the incoming programme feed. You correctly state that Killin is a relay of Angus, however Killin is actually fed from Angus indirectly via Kenmore at the other end of Loch Tay. Kenmore has line-of-sight ENE of the Killin site, hence the vertical log periodic antenna pointing in that direction. However, going back to my comment about the initial engineering problems, I believe that the main programme feed to Killin was eventually installed as a microwave link from Kenmore due to the fact that the rebroadcast link suffered from excessive fading over the long Loch Tay path (and due to the fact that Torosay couldn't be used for the main feed either - see below). The photos of the Killin mast on your site clearly show a typical microwave link dish pointing in the direction of Kenmore. Also, I assume that the vertical log periodic antenna is used for a standby programme feed in situations where the microwave link is down?
| Debate went on for some weeks after these photos were first published, about the purpose of the horizontal yagis on the Killin tower. The correct answer can now be revealed: Re the mystery yagi antennas pointing to the NW, this is a separate feed of a portion of combined transmitter power to the Crianlarich self-help system. Thanks to Tony Docherty for this information. |