> From: "hwingate" <[EMAIL PROTECTED]>
> Subject: [Repeater-Builder] Re: Weather Radios
>
> The 1050 hz tone is the original arert tone that was used
> before the SAME system was installed. It is still transmitted
> with a duration of 8-10 seconds,is not area specific and will
> give a warning for the whole coverage area of the station, sometimes
> as much as 5000 square miles.
> Generating a SAME tone is not for the faint of heart. It is
> digital and has such oddball parameters as 520.83 bps data rate,
> a digital 1 = 2083.3 hz , a digital 0 = 1562.5 hz. For more
> than you ever wanted to know about SAME go here:
> http://www.nws.noaa.gov/nwr/same.pdf
>
> Henry, K4HAL
Henry, I don't think it would be all that hard to build a FSK audio
oscillator to work with a 1.92 mS wide mark and space tone (which is
what 520.83 bps translates to) at those frequencies. The
phase continuity requirement may be a little tricky. though.
FWIW, the SAME code definitions are in the referenced PDF. The encoder
is even somethng that might be worth writing as a sound card utility,
provided the sound card has the requisite transient response and
stability.
Guess I need to dig up the sound libraries and read the furnished manual
on them.
de kg7yy
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