[EAS] FCC NPRM on improving EAS just issued

[Mike McCarthy]

In addition to using the ASTC data channel for continuous confidence
testing, the same can be done using a very slow, but exceedingly robust
PSK method placed below the audio passband of AM stations. Specifically
this could be used on clear channel stations and those regionals with
large coverage areas.

The IF passband can be so tight so as to even ignore impulse noise from
static and lightning. One station could cover a significant portion of the
USA even with the proposed skywave contour protection reductions.

In this manner, the PSK code would cycle every minute or so to insure
reception confidence. When a validated message comes along, the system
would send the header and EOM of any properly coded messages, repeating
for a period of 15 minutes.

The limitation is speed. At 10 baud, there would only be enough bandwidth
to send the header and EOM. I don't think there would be enough to send a
CAP IP address longer than 20 or so characters and maintain a high degree
of confidence.

Something to think about.

MM

On Thu, February 4, 2016 1:46 pm, Sean Donelan wrote:
> On Tue, 2 Feb 2016, Alex Hartman wrote:

>
> Television, satellite radio and TV, a majority of cable use mostly
> digital distribution.   There is no reason to continue to hold back all the
> other communication channels to the lowest denominator narrowband, AM