N3JI writes:
> Necessary Bandwidth. For a given class of emission, the width of the
> frequency band which is just sufficient to ensure the transmission of
> information at the rate and with the ***quality required*** under
> specified conditions. (Emphasis mine).
In Part 96.113 Broadcasting and Music are specifically prohibited.
The only justification for medium fidelity of high fidelity audio
is for "broadcast" purposes ... in fact, licensees in the medium
and high fidelity services have "proof of performance" burdens that
they must meet.
Part 2 specifically assumes the quality necessary for the communications
purpose covered by the rules, not some arbitrary standard of chosen at
the discretion of one licensee. If the "licensee's discretion" standard
were adopted, national/international regulation as well as international
standards would go out the window. It is incredibly easy for one licensee
to say "I need 1080 lines of video" another say "I only need 720" and a
third to say "well I need 1500." The same thing in the audio area.
It is for that reason that the Commission (and ITU) have generally
settled on 2.5 KHz for basic voice quality (two-way dispatch, "toll
quality," public safety/service, etc. including amateur), 5 KHz for
moderate fidelity service (including nighttime AM and international
broadcast) and 15 KHz for high fidelity (FM broadcast) services. For
you to arbitrarily decide that you "need" 4 or 5 KHz quality is just
as absurd as the lid who operates "all knobs to the right."
73,
... Joe, W4TV
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