RadioBanter - View Single Post

Registered User · December 14th 10, 04:58 AM posted to rec.radio.amateur.antenna

On Mon, 13 Dec 2010 18:29:24 -0000, wrote:

Registered User wrote:

You can call it meaningless babble but in its simplest form
dimensional metadata provides meaning and additional information to
raw data.

Yes, meaningless babble.

The phrase "antenna efficiency is 80%" says everything you need to know.

The phrase "antenna efficiency" is non-dimensional metadata
and to quote Mr. Clark
-quote-
Given that "efficiency" has been hijacked, the phrase above could as
easily relate to wind load.
-end quote-

The phrase "engine efficiency is 35%" says everything yoy need to know.

You assume that engine efficiency is only and always measured in terms
of energy efficiency. Engine efficiency can mean different things to
different people. There are other expression which are also used to
calculate engine efficiency including fuel economy, power-to-weight
ratio, and power-to-displacement ratio. The respective UOMs for those
measures can be expressed as miles per gallon, hp/lb. and hp/cid. For
these calculated measures "engine efficiency is 35%" is not suitable
result.

And if antennas is the topic to begin with, the phrase "efficiency is 80%"
says everything you need to know.

No "dimensional metadata" required.

Non-dimensional metadata (antennas) is provided as the topic and the
result contains non-dimensional metadata (efficiency) as well. As Mr.
Clark pointed out "antenna efficiency" is a potentially ambiguous
phrase. Such ambiguity can be eliminated by using dimensional metadata
e.g. antenna efficiency calculated as the ratio of power radiated to
input power. With the measure qualified as such an individual reading
a summarized report doesn't have to be party to yesterday's discussion
or know the exact expression used in the calculation or infer meaning
from ambiguous metadata such as "antenna efficiency". The phrase "80%
antenna efficiency calculated as the ratio of power radiated to input
power" explicitly provides the proper meaning to the calculated
result.