[Elecraft] K3 Questions.& ..DVoice

[Corboy-Poteet]

Stuart, what bandwidth do the Public Service people use on their
digital systems?  And let me ask you my earlier question: what happens
on digital voice when you decrease the bandwidth on reception? Can you
significantly improve signal-to-noise by narrowing the bandwidth (with
only a loss of fidelity)?  Or does digital voice have no tolerance for
bandwidth reduction; that is, you need basically all of the bits in
order to provide intelligible audio out.

Mike   W5FTD



> Absolutely good points about the fail soft nature of analogue signals.
> While the new digital systems usually have a threshold, and fail hard, ie,
> the message does not get thru even partially, after a certain loss of signal
> point!

> This is why analogue ham communications get thru in disasters, and many
> Public Safety systems do not, as they depend more and more on go/ no go
> digital systems.

> -Stuart
> K5KVH
> retired fireman