[Elecraft] [OT] Legal Data Bandwidths

[Bill Frantz]

[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, k6dgw at foothill.net (Fred Jensen) wrote:

>A data transmission could occupy any BW so long as its symbol 
>rate remains at or below 300.

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