On Oct 9, 2005, at 2:30 PM, Jeff Stai wrote:
You want to set it to the center of the two tones you are using for
AFSK. If 1000Hz is your Mark frequency, and 170Hz is your shift,
then you should center at 1000-(170/2) or 915Hz.
If you do this, don't use OP1 as your FL1 filter. The second harmonic
of your tones will be in the passband when you are transmitting,
otherwise.
I recommend higher frequencies. I ended up using 1500 Hz as the
center of my RTTY filter passband.
Bill Coleman, AA4LR, PP-ASEL Mail: [EMAIL PROTECTED]
Quote: "Not within a thousand years will man ever fly!"
-- Wilbur Wright, 1901
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