[TowerTalk] (no subject)

[jimlux]

On 6/14/17 10:44 AM, JVarney wrote:
> Thanks Kurt for the very interesting history of
> how antenna square footages came to be. If we walk
> through TIA-222-G it will illustrate Kurt's point that
> just giving a square footage isn't that helpful:
>
> ====
> Gh is a "gust factor"
> EPA is the Effective Projected Area
>
> (EPA) = Ka[(EPA)N cos2(θ) + (EPA)T sin2(θ)]
>
>

I think you have to evaluate the above at "all angles" and pick the 
worst case

Yeah, it really comes down to either giving the breakdown of actual 
projected areas, and let the user figure out the final EPA for their 
particular exposure, or give a fairly complete table.


The computations aren't hideously complex, but aren't something I'd want 
to do with a hand calculator or slide rule.  So If I were manufacturer 
who wanted to be helpful, I'd pick some representative situations and 
run the calculations for those, but also give all the assumptions (gust 
factors, etc.)