- Jun 2, 2006Ok, latest version is posted. I dug up a revised version of the FSK
modulator I wrote for the OpenTracker around the end of 2004. It never
worked right and I gave up on it at the time, but I took another look at it
and found two bugs - an overlooked flag, and an improperly generated sine
table. Fixed those and it's working great now.
The new code expands the PWM output to 7 bits resolution from 4. This
should produce slightly cleaner audio, but it also provides some extra room
The TXLEVEL command is now implemented, and will scale the audio level over
a fairly wide range. I wouldn't take it below about 32 though, or
quantization noise might start being a problem.
I'll have to see if I've got a radio around here that requires a high audio
drive level, and see if I can get the tracker to work on both that and a
regular radio with the same hardware setup. At the very least, I'll hook it
up to a real 'scope tomorrow and see what I can get for usable voltage
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