[EAS] New EAS handbook

[Sean Donelan]

On Tue, 25 Jul 2017, Botterell, Arthur at CalOES wrote:
> Seems like the extended drone of the two-tone may be one of the things 
> listeners (and PDs) object to.  Certainly a sounder could be designed 
> that could be recognized in a second or less.

Backwards compatibility and in-band signalling sucks.  The EAS "Attention 
Signal" was to trigger equipment attention.  Humans just happened to also 
hear it.

If the next-gen EAS used out-of-band signalling, then the human audiable 
signals could be for humans.

Japan uses a very different audible signal for earthquake warnings versus 
other types of warnings.