> I have the newest T2 (with MX614). Is the schematic available yet, or
> changes to the manual? Also, when setting up the deviation, the best
I just posted a preliminary version of the schematic to the files
section of the group. I've got a printed copy at the office with all of
my changes to the output filter scribbled in, and I've got to look those up.
I'm pretty sure C3 and C17 are 0.047 uF, R23 and R24 are 1k, R3 is 0,
and R35 is somewhere around 30k.
There won't be more than a paragraph or so added to the manual for the
new version, just an explanation of the two added solder jumpers and
other minor changes.
> I can get is about 1.4kc with the HI jumper on. With the HI jumper
> off, I get no deviation at all. Also, it appears that the Transmit
I *think* I got all of the output filters changed before anything
shipped, but check yours against my notes above. You should be able to
get way more output from the new board than the old one, and with a
cleaner sine wave.
> Audio Control has no "control" over the deviation - I see no change
> from min to max setting. Is that normal? (Hence, need for a schematic).
No, you should still get control just like before. Try it from the
command line - run CAL A and use [ and ] to change the audio level.
> On a positive note, with the MX614, the Low tone is slightly lower in
> deviation than the High tone - unlike the OT+. I am feeding the data
Actually that's just the new output filter. The MX614 is NOT used on
the output side, to maintain software compatibility and allow 300 baud
and PSK31.
> port of an FT-1500. I probably need to wire up the MIC port to get
> more gain, maybe, and pre-emphasis.
You should be able to get at least 800 mV p-p into a 600 ohm load.
Scott
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