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Post 1,488 made on Thursday March 13, 2008 at 11:26
Long Time Member
January 2008
The EIRP (or ERP) is a function of the transmitter, losses incurred by the feedline and phasing arrangement, and the gain of the antenna array. The types of feedline used by broadcasters are very low loss as are the phasing arrangements which are generally within the collective multi-bay antenna itself. If the collective antenna has a gain of 13dBi minus inherent losses of 2dB that is 11dB. If you pump in a signal of 2.5kW you end up with an EIRP of about 30kW. This sounds reasonable to me. You can net much higher gains if you design the antenna system to favour one area over others, but that isn't what they're describing. Side-mounting an antenna generally gives you what's called an offset pattern. Basically a circular patter offset with respect to the centre of the tower as viewed from overhead.
Donny Jaguar

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