[Thread renamed to have some relation to the discussion.]
This rule allows some really interesting options. As I
understand "symbol rate" it is the rate at which the signal
changes from one symbol (BAUD) to another. What is not limited
is the number of bits sent with each symbol.
To present an example I hope never to see on the air, on 15M we
are permitted to send digital data between 21.0 to 21.2 MHz.
Someone could come up with a digital mode that used 200 KHz of
bandwidth and use up all the digital allocation on 15M. It would
have to remain within the symbol rate limitation, but it could
send many bits with each symbol. The performance might be quite
spectacular with the right choice of data rate, forward error
correction, and error checking.
The ARRL recommended to the FCC that modes be regulated by
bandwidth, and not just the mode. The FCC said no. However, that
kind of regulation would solve this problem.
73 Bill AE6JV
On 7/6/18 at 2:10 PM, [email protected] (Fred Jensen) wrote:
A data transmission could occupy any BW so long as its symbol
rate remains at or below 300.
-----------------------------------------------------------------------
Bill Frantz | "The only thing we have to | Periwinkle
(408)356-8506 | fear is fear itself." - FDR | 16345
Englewood Ave
www.pwpconsult.com | Inaugural address, 3/4/1933 | Los Gatos,
CA 95032
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