[EAS] Tsunami Warning - No Audio

[Lowell Kiesow]

Thanks Harold, I stand corrected.  I believe some other brands of 
first generation EAS units still use the attention tone to trigger 
the recorder, but Sage took a better approach.

At 05:12 AM 3/15/2011, you wrote:
>There has been some discussion of what the Sage ENDEC does with the
>attention tones at the start of EAS or NWS/SAME messages. For
>completeness, here is a detailed description.
>
>The ENDEC looks for the presence of those tones only to remove
>them.  The sequence is:
>
>Hear a 2nd matching eas header, start the recorder.
>Hear a 3rd header, restart the recorder.
>If a two-tone or 1050hz tone is detected within a dwell time, wait
>until it goes away, then restart the recorder.
>Hear the end of message data, stop the recorder.
>
>This means that if the audio quality is not sufficient to detect the
>tone, it will simply appear in the replayed audio, but the audio
>should still be present.  The ENDEC waits for the start of the two
>tone for a few seconds (the EAS spec says it should start one second
>after the last header) and will ignore it after that.  It waits
>longer for the start of the 1050 hz tone before ignoring it. In the
>old days, that tone sometimes took several seconds to start.  The NWS
>upgraded their system once or twice since 1997, and the tone appears
>more quickly now.
>
>That is what is supposed to happen.  If your ENDEC is not working
>this way, send me an email.
>
>Harold
>

         Lowell Kiesow, Chief Engineer
         KPLU 88.5, KVIX 89.3, KPLI 90.1
         www.kplu.org  www.jazz24.org