[EAS] Part 11 / Local CAP Relay Networks

[Harold Price]

Just a technical discussion of possibilities, not a recommendation.

For day to day alerts sending CAP without audio and letting the 
CAP/EAS device do text to speech, any simple modem will do, even at 
1200 bps, it would be 30 seconds or so to send a CAP message without 
audio, about 4 seconds at 9600.

If you want to use UHF/VHF, and you want to be able to stream the 
EAN, you need something in excess of 64kbps.  That's too much for a 
narrowband FM channel, though with a lot of playing around and maybe 
two channels you could do the CAP message data at 9600 without 
embedded audio on one channel and use a 2nd channel for analog 
audio.  You could use the same channel but at that point you might as 
well just use EAS for the EAN.  That method (sending audio in the 
clear) isn't secure, though you could use radios with security for the audio.

Harold

At 12:11 PM 5/20/2011, Richard_Rudman wrote:
>Hi, Harold -
>
>Thanks for the link to the items on circulation.
>
>Do you (or any of the other vendors who monitor this list) have any 
>thoughts on practicality, equipment needs and rough costs if 
>practical for local one way "wireless" transmission of CAP messages 
>using UHF or VHF channels?
>
>Richard
>
>On May 20, 2011, at 8:55 AM, Harold Price wrote:
>
> > It has been out for a week or so.  Here is a web page that gives a
> > list of items on circulation.
> >
> > http://transition.fcc.gov/fcc-bin/circ_items.cgi
> >
> > Harold
> >
>
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