Garmin GTX 320 ATC - Manual (Page 13)

190-00133-02 Rev B 3-4
CAUTION
Do not allow the transmitter to oscillate below 1080 MHz as indicated on the
ATC-1400A Test Set or else damage may occur to the mixer.
PARAMETER SPECIFICATION
Frequency 1089.0 to 1090.0 MHz
XMTR PWR 125 Watts Minimum through a –1.5dB coax
Pulse Rise Time 50 nS to 100 nS
Pulse Fall Time 50 nS to 200 nS
Pulse Width 350 nS to 550 nS
5. Adjust C635 for maximum power output as read from the ATC1400A test set. The power must be greater than
125 watts.
______ > 125 Watts
6. Verify that the frequency is still 1089.5 ± 0.5 MHz. If the frequency is out of tolerance, then loosen the locknut
on C620, set the frequency within specification, and then tighten the locknut while maintaining the frequency
specification.
______ (1089.5 ± 0.5 MHz)
7. Reinstall the cover over the transmitter adjustment holes.
______ OK