Rudy Bakalov wrote:
> I have never model an antenna before and thus have no idea what the
> electrical length of the tower is. Furthermore, I plan on adding 2 more
> tribanders next year, at 68' and 30' so the loading will change. Finally, all
> the books I have read on shunt-feeding a tower have created an impression
> that doing so is not as trivial and certainly not plug-and-play. Thus, I am
> considering the much simpler and more predictable T-vertical.
>
> Remember there will most likely be some interaction between the "T" and the
> grounded tower distorting the pattern, if one end of the T is supported by
> your tower. I have found the easist way to tame a shunt fed tower is to feed
> it with a three or four wire cage rather than a single wire shunt and the
> complexities of feedlines and rotor cables being part of the mix. The cage
> does the radiation essentially decoupling a lot of what is run inside it.
> Chokes and grounding at the base is still imortant however.
>
Herb Schoenbohm, KV4FZ
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UR RST IS ... ... ..9 QSB QSB - hw? BK
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