190-00133-02 Rev B 3-2
1. Carefully dislodge the thin metal piece that covers the access holes to the transmitter section (figure 3-1) by
prying one end with a small, thin screwdriver.
2. Set the ATC1400A front panel controls to the following:
PARAMETER
SET POINT
XPDR MODE
MODE C
PRF
500 Hz
RF LEVEL
-50 dBm
SLS / ECHO
OFF
FREQUENCY/POWER TOGGLE SWITCH
F
1
/P
1
______ OK
3. Set the GTX320 transponder mode select control knob to the ON position.
______ OK
NOTE
Allow the unit to warm up for approximately ten minutes before setting frequency.
4. Rotate the frequency-adjust slug C620 (figure 3-1) with the screw driver portion of the transmit adjustment tool
to a frequency of 1089.5 ± 0.5 MHz. Observe the frequency display on the test set. Tighten the lock nut when
finished.
________(1089.5 ± 0.5 MHz)
