G900X/G950 Installation and Maintenance Manual – PICP & Warranty Registration
Page C-23
190-00719-00
Revision D
C.2.3.4 Marker Beacon Test
Figure C-15. Marker Beacon Symbology
Using a ramp tester, simulate the outer marker, middle marker and inner marker signals by following the
test equipment manufacturer’s instructions. Verify that each marker audio signal is present over the
headphones and speaker.
1.
Connect the RF output of the Marconi signal generator to the Marker Beacon antenna input on the
GMA. The carrier frequency should be 75 MHz.
2.
Set the Marconi to Outer Beacon signal mode, and increase the RF level output to 1 mV and AM
Depth to 95%. Int F1 should be 400 Hz.
3.
Verify the flashing “O” is seen on the PFD to the left of the altitude select value.
4.
Set the Marconi to Middle Beacon signal mode, and increase the RF level output to 1 mV and
AM Depth to 95%. Int F1 should be 1.3 kHz.
5.
Verify the flashing “M” is seen on the PFD to the left of the altitude select value.
6.
Set the Marconi to Inner Beacon signal mode, and increase the RF level output to 1 mV and AM
Depth to 95%. Int F1 should be 3 kHz.
7.
Verify the flashing “I” is seen on the PFD to the left of the altitude select value.
