On 10 May, 16:55, wrote:
art wrote:
On 10 May, 14:41, (Richard Harrison) wrote:
Art wrote:

"For my interest, what is the unit that must be used for front to back
ratio of a directive antenna?"

I must be an idiot for venturing an answer, but ratios can be just
numbers, but numbers have origins. If radiated power in one direction is
twice that in another (reference), we can say it has a directive gain of
two or we can say it has a 3 dB gain. Front to back ratios have the same
origins and units. For legitimacy, Terman says on page 871 of his 1955
opus:
"The directive gain can be expressed either as a power ratio, or in
terms of the equivalent number of decibels.

Best regards, Richard Harrison, KB5WZI
So it is now the norm not to cancel units of measurement in physics?
Woe is me. Free speech takes on a new meaning for some but not
acceptable from others meaning a term for a formula can now be called
a ratio with units of one's choice. Still, this is amateur radio after
all, it does not have to follow professional standards as most was
learned in the CB era

Example:

Forward gain = 12db
Reverse gain = 2db

Front to back ratio = 12db/2db = 6; no units as they cancel.

5th grade mathematics.

--
Jim Pennino

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Not so fast! It would appear that we have some real experts in the
group
that would disagree with you on this, probably because they judge
your
performance on your postings and not on the extensive experiences.
I suspect that some did not go along with your lengthy verbal
launchings
on the illigitimacy of adding a time metric to Gaussian law
regardless
of mathematical proof given, You were not able to pinpoint a
mathematical error and relied on the word "can't" around which
many of your utterings revolve. There was a fable written about
a person who called "wolf" once to often who had nobody to
blame but himself. If you make a habit of lying then the truth
get's a hard time in obtaining belief.