Antenna Tune-Up - SAC SS-800AVS Manual

5.4 Antenna Tune-Up
Install the antenna according to the Antenna Installation manual.
See the Transmitter Diagram in section 2 for the location of all
transmitter controls.
Check that the RF DRIVE control on the Oscillator PWB is fully
CCW. Set the switch on the Recycle PWB to CARR. Set the
switch on the Auto Shutdown PWB to OFF. Check that the Jumper
on TB4 is connected from Terminal 1 to Terminal 3.
NOTE: Autotune is disabled during modulation. If the switch on
the Recycle PWB is in CONT (continuous tone), the system will
not tune.
Apply AC power. The EMITTER VOLTS scale should read 0.I to
0.2 volts. Note that with a dual system, AC power is applied
by placing the Local Radiobeacon Control System power switch
in the ON position. The following steps may also be required:
Press the Primary Transmitter Select switch to the
Transmitter 1 position¯
b.
Press the Transmitter On/Off switch to the ON position.
c. Press the Reset pushbutton.
Slowly turn the RF DRIVE control CW. DO NOT allow the EMITTER
VOLTS to go above 0.5. DO NOT allow the TUNE indication to
go above half scale. The TUNE indication may momentarily
increase if the autotune circuit is tuning the antenna.
Check the TUNE indication to determine if the antenna is tuned.
The antenna is tuned if the TUNE indication is 0 or very low.
Go to Step 7 if the antenna is tuned¯
Rotate the PC-1000 VERNIER tuning knob from one limit to the
other. If the Autotune motor starts to tune the antenna,
release the VERNIER knob, and go to Step 7.
Turn RF LEVEL control fully CCW, change the FINE TAPS Switch
to the next lower tap and repeat Steps 3, 4, and 5. If the
antenna still did not tune, change the FINE TAPS Switch to the
next higher tap and repeat Steps 3, 4, and 5. Continue this
bracketing procedure until the Autotune motor starts to tune
the antenna. NOTE: If the FINE TAPS Switch is on tap 4, and
it is necessary to decrease the inductance, change the Coarse
Tap to the next lower tap and change the FINE TAPS Switch to
tap 44. If the FINE TAPS Switch is on tap 44, and it is
SS-800AVS Southern Avionics
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