On Dec 14, 12:24*pm, Registered User wrote:
On Tue, 14 Dec 2010 05:37:25 -0800 (PST), wrote:
On Dec 14, 5:02 am, Registered User wrote:

When data gets shared among multiple parties it is important that a
ubiquitous language is used to describe the data and its meaning.
Antenna efficiency can be measured in different ways so the phrase
"antenna efficiency is 20%" can mean different things to different
people. All it takes is one person to ask how antenna efficiency is
calculated and it will become evident that context of "antenna
efficiency is 20%" does not provide all the information required.

Sure it does. *Antenna efficiency is only calculated one way,
so there is no need to add extra "metadata".

Funny thing, when working parabolic antennas antenna efficiency and
aperture efficiency are used interchangeably.

I find that a funny thing, since they define two different things.
They are not the same thing, and should not be confused,
intermingled, or even paired up on the same date to go watch
Star Wars at the midnight movies.
If I were to refer to aperture efficiency, I would call it aperture
efficiency, effective aperture, or maybe even antenna effective
area, but not antenna efficiency.