2636Re: T2 demod questions
- Dec 2, 2007--- In email@example.com, Scott Miller <scott@...> wrote:
> The EQ jumper is in the input filter section, near C2 and C3. It just
> switches C3 into the audio input path and flattens the filter response.
> It's pretty close to the circuit used by the KPC-3 and I think
> the TNC-2 clones as well. Somewhere around here I've got plots of theI must be looking at an old schematic (the one in the files area of
> frequency response from the Spice simulation.
the tracker2 group). I don't see C2 in the demod section. There is a
C2 on the CPU which appears to be a bypass cap for power. There is
also a couple of pots on the schematic that I don't see on the board.
I recorded test tones produced by the T2 and played them back. The EQ
jumper makes no difference in either tone's amplitude when looking at
the input pin of the demod.
I am seeing solid copy with a sound card using AGWPE and what the T2
misses, the sound card is receiving. I hope to be able to record some
consistent misses by the T2 to get a better look at the waveform.
Is there an updated T2 schematic?
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