SAC SS-800AVS Manual page 93

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12.
necessary to increase the inductance, change the Coarse Tap
to the next higher tap and change the FINE TAPS Switch to tap
4. It may be necessary to change the FINE TAPS Switch a few
positions before the inductance will be the same as it was
before the Coarse Tap was changed.
The antenna is properly tuned when the VERNIER tuning knob is
in the center of its range or slightly to the left. If the
VERNIER tuning knob is not in this position or is at a limit,
it will be necessary to change the Fine Tap. CAUTION: Always
turn RF LEVEL CCW before changing taps. Increasing the tap
number increases the inductance. If the VERNIER tuning knob
is at a limit, it may be necessary to change the tap more than
once before the VERNIER tuning knob leaves the limit. NOTE:
If the FINE TAPS Switch is on tap 4 and it is necessary to
decrease the inductance, or if the FINE TAPS switch is on tap
44 and it is necessary to increase the inductance, see note
in Step 6. After each tap change, go back to Step 3.
Set the Meter switch on the transmitter to the HI scale and
adjust RF DRIVE for a reading of 100W. Switch the meter to
TUNE and note the reading. Turn RF DRIVE fully CCW.
Increase the IMPEDANCE TRANSFORMER tap in the antenna coupler
by one number and adjust RF DRIVE to i00 watts.
Check the relative TUNE indication on the meter. If it is
greater than the indication noted in Step 8, turn RF DRIVE to
full CCW and decrease the IMPEDANCE TRANSFORMER tap to one
position lower than the original position. If it is less than
the indication noted in Step 8, turn RF DRIVE to full CCW and
increase the IMPEDANCE TRANSFORMER tap by one position.
Repeat Steps 8, 9, and i0 until the IMPEDANCE TRANSFORMER tap
is found that gives the lowest tuning indication. Check the
EMITTER VOLTS. Normal reading is 1.3 to 1.7 volts for 100W.
If there are several IMPEDANCE TRANSFORMER taps that give a 0
TUNE indication, choose the one that gives a correct EMITTER
VOLTS reading.
Place the Recycle PWB switch in the IDENT position and adjust
RI6 (Tol. Adj.) on the coupler Autotune PWB CCW until the
Autotune motor begins to chatter. Turn the Tol. Adj. pot CW
until all chattering just stops. Remove transmitter power.
Remove the clip on the RF output lead. Trim the wire to the
proper length insuring that at least 2 inches (5 cm) separates
the wire from both the coil and the coupler enclosure. Dress
the wire to avoid sharp bends which may lead to high voltage
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Southern Avionics
Company
SS-800AVS