[aprssig] paccom schematic
bruninga at usna.edu
Sat Sep 1 07:32:24 CDT 2007
> Yes the tones are clean and not distorted.
> The high tone is about 6 db lower
> in amplitude the low frequency tone.
Some TNC's really hate a tone skew like that. I cant remember which one is ihger, but one skew is worse than the other.
Try improving it with a high pass filter in front. With a low end roll off starting at 300 Hz. That should balance the tones. If input impedance of the TNC is known, say 600 ohms, then about a 0.47Uf in series on the input might do it?
If you have plenty of audio level, just use a 0.1uF or smaller for a wuick test.
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