Ten-Tec SSB-CW-AM Instruction Manual page 55

which you will connect your voltmeter to do the L2 and L3 VCO
coil adjustments. lf more convenient for your test leads, you can
also solder a length of insulated hookup wire instead, and trim it
shorter after completing the adjustment.
3-75. Solder a 1/2" length of bare wire (trimmed from a part
already installed) to the pad marked "FREQ TP".
Adjustment of VCO coils L2 and L3 requires an alignment blade
of the CORRECT SIZE to fit the slot in the slug. A blade that is
too small can easily crack the slug. If you cannot find the right
size tool, use sandpaper to shape carefully the tip of a plastic
beverage stirrer or wooden kabob stick.
3-76. Re-attach the Display Board and reconnect the encoder
plug to J4 as in Phase 2.0 testing.
3-77. With power switch turned off, reconnect the red wire
switch plug to J2, and reconnect the wall transformer power
supply to J1.
3-78. Connect your meter's red + lead (DC volts range) to
the VCO test point and ground. You will be observing voltages
in the 2.5 to 8 volt range.
3-79. Turn on DC power. Again, the frequency display
should read 15.000.0 MHz. If not, perform the Processor Reset
explained in the Operating Instructions (Reference Section) and
in the Phase 2.0 test.
3-80. Tune down to 100 kHz. (Use FAST tuning mode!)
3-81. Using the proper size of alignment tool, adjust VCO coil
L3 for a reading of 2.5 VDC at the VCO TP.
3-82. If you do NOT observe at least 2 volts DC present at
the VCO test point, there is a problem. Turn off DC power and
thoroughly recheck your work.
3-83. With 3.5 VDC at the VCO TP for 100 kHz, start tuning
upward in frequency. You should observe a gradual rise in
voltage: about 4.5 volts at 7.000 MHz. The maximum will be
about 8.5 volts ± .5 volt at 13 .235 MHz.
VCO Test and Alignment
1254 Assembly 34