Test The Gps Receiver For Com Interference - Garmin G3X Installation Manual

Test the GPS Receiver for COM Interference:

This test must be conducted outside, as the use of a GPS repeater inside a hangar may result in a failed test.
Once the signal acquisition test from Section 13.2 has been completed successfully, perform the following
steps:
1. Power on the unit in configuration mode and use the FMS Joystick (scroll down) to view GPS
Status on the Main Page.
2. Monitor GPS status on the Main Page. Possible GPS status indications include:
•
•
•
•
•
*Indicates valid GPS position fix for this test
3. Select 121.150 MHz on the COM transceiver.
4. Transmit for a period of 30 seconds while monitoring GPS status.
5. During the transmit period, verify that GPS status does not lose a valid GPS position fix on the
Main Page in configuration mode.
6. Repeat steps 3 through 5 for the following frequencies:121.175 MHz, 121.200 MHz,
131.250 MHz, 131.275 MHz, and 131.300 MHz.
7. Repeat steps 3 through 6 for other installed COM transceivers (if applicable).
8. If an installed COM supports 8.33 MHz channel spacing, repeat steps 3 through 5 (while
transmitting for a period of 35 seconds), for the following frequencies: 121.185 MHz,
121.190 MHz, 130.285 MHz, and 131.290 MHz .
9. Repeat step 8 for other installed COM transceivers supporting 8.33 MHz channel spacing (if
applicable).
10. This COM interference test should be repeated for each installed GDU 37X with a connected
antenna.
190-01115-01 G3X Installation Manual - Post Installation Checkout and Calibration Procedures
Rev. L
NO ANTENNA
AUTOLOCATE
LOST GPS FIX
2D GPS FIX
3D GPS FIX*
• SEARCHING THE SKY
• ACQUIRING
• NO GPS FIX
• 2D DIFFERENTIAL FIX
• 3D DIFFERENTIAL FIX*
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