Garmin GTX 320 ATC - Manual (Page 14)

190-00133-02 Rev B 3-5
3.3 TESTING
Perform testing after completing transmitter frequency adjustment.
3.3.1 Test Equipment
See paragraph 3.2.1.
3.3.2 Test Setup
See figure 2-3.
3.3.3 Test Procedure
3.3.3.1 Turn-On Delay
NOTE
The test setup will not work if any toggle switch on the ATC-1400A is placed in the incorrect position.
1. Configure the ATC-1400A as shown in Figure 3-6.
2. Turn the transponder mode select switch to the OFF position. ______ OK
3. Adjust the ATC-1400A Transponder Test Set to an RF level -69 dBm. ______ OK
4. Turn the GTX320 mode switch from the OFF to the ON position. There shall be an approximate 5 second delay
before the unit transmits. ______ OK
5. Rotate the mode select switch on the GTX320 to the ALT position. The GTX320 shall continue to reply to valid
interrogations. ______ OK
6. Rotate and hold the mode select switch on the GTX320 in the TST position. The GTX320 shall continue to reply
to valid interrogations. ______ OK
3.3.3.2 Reply Transmission Frequency
1. Set the transponder mode select switch to the ON position.
2. Rotate the RF level control on the ATC-1400A to -69 dBm. The XMTR FREQ display on the ATC-1400A shall
read from 1087 MHz to 1093 MHz.
________(1087 to 1093 MHz)
3.3.3.3 Transmitter Power Output
1. Set the PRF thumb wheel switches to 1200 Hz. The XMTR PWR display on the ATC-1400A shall read greater
than 125 watts through the calibrated -1.5dB coax.
________ > 125 Watts