Garmin GTX 320 ATC Maintenance Manual page 13

PARAMETER
Frequency
XMTR PWR
Pulse Rise Time
Pulse Fall Time
Pulse Width
CAUTION
SPECIFICATION
1089.0 to 1090.0 MHz
125 Watts Minimum through a –1.5dB coax
50 nS to 100 nS
50 nS to 200 nS
350 nS to 550 nS