for 9600-Baud Packet
0
Next locate the set of pads labeled
MOD (C
&
R),
above connector
J2008
(fig. 3). Solder a
10-kQ chip resistor across pad
R,
and a 0-Q
chip resistor* across pad
C,
and a wire lead to
the adjacent pad. Pre-emphasized audio is fed
to the transmitter here.
0
Note the small plastic plug in the chassis cut
out at the rear left corner of the CNTL Unit
compartment. Remove this plug, then run the
leads from your TNC through this cut-out and
solder them to the appropriate leads on the
CNTL Unit. Be sure to insulate any spliced
leads with heat-shrink tubing or electrical
tape.
02018 AF Buffer Amp.
····�·.;.:.:.;"Moo(ii'Aii..1N"i':
i R
C
Approx. 2Vp-p
:
: .............. �����---····_;
Fig.
4
TNC DATA IN/OUT Lead Connections
FT-2500M Technical Supplement
0
After checking all connections for integrity,
replace the top cover and tighten all screws.
This completes the modification.
While this modification should work with most
units, experimentation with audio input and out
put level may be necessary before optimum per
formance is obtained.
2-3
