[GreenKeys] FYI NOAA Alerrts

[Doug Hensley]

>From Wiki Notes:

"Messages in the EAS are composed of four parts: Specific Area Message Encoding (SAME) header, an attention signal (1050 Hz for NOAA Weather Radio, 853 Hz and 960 Hz together for commercial broadcast stations), an audio announcement, and a SAME end-of-message marker. For NOAA Weather Alerts, SAME uses NWR-SAME Codes to relay specific alerts, such as tornado warnings, and hurricane advisories.


SAME is an AFSK (Audio Frequency Shift-Keying) protocol used in North America to send digitally encoded information about alerts, advisories, and warnings. Canada and Mexico both utilize SAME in some fashion for weather and disaster alerts The SAME FSK signal itself is 1200Hz wide with a 260Hz shift. Each individual bit lasting 1920 μs (1.92 ms) each, giving a bit rate of 520.8333 bits per second."

Cheers,

Doug W5JV





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