Garmin GTX 320 ATC - Manual (Page 19)

190-00133-02 Rev B 3-10
3.3.3.11 IDENT Test
1. Set the ATC-1400A to Mode A.
2. Turn the GTX 320 mode select knob to the ON position.
3. Set the RF level on the ATC-1400A for a 100% reply rate.
4. Press the IDENT button on the transponder. The unit shall cause the ATC-1400A XPDR Code display to read
1d0000 for approximately 20 seconds. The SPI pulse shall appear next to the P3 pulse on the oscilloscope. See
Figure 3-5.
5. Rotate the mode select switch to the SBY position.
6. Press the IDENT button on the transponder. The reply light shall turn on for approximately 25 seconds, but
the unit shall not transmit.
______ OK
Figure 3-5. P1, P3, and SPI Pulses
3.3.3.12 Front Panel Test - OFF
Set the transponder mode select switch to the OFF position. Only the “OFF” nomenclature shall be illuminated,
and all other panel lighting shall not be illuminated. The unit’s internal power supplies shall all be off.
______ OK