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#11
December 14th 10, 06:19 AM
posted to rec.radio.amateur.antenna
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antenna physics question
Registered User wrote:
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. Of course it is, that is basic physics and the definition. Other things are other things and have qualifiers, especially if they use the word "efficiency", otherwise it is just ignorant babble. snip babble 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. The phrase in question is "dimensional metadata" and now you are switching the subject to "non-dimensional metadata". 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. The definition of antenna efficiency is the "ratio of power radiated to input power", so stating that is redundant. snip more babble I suppose you argue with writers of recipes when they say "add 1 cup of milk" saying they should say "pour milk into a measuring cup, that is a cup used for measuring liquids, until the milk level, that is the level in the measuring cup, reaches the mark on the measuring that denotes the meauring cup contains 1 fluid cup, in this case the milk, then pour the contents of the measuring cup into..". -- Jim Pennino Remove .spam.sux to reply. |
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