Garmin MX20 Installation Manual page 49

7. Once the MX20 is in Test mode, press the ENTER key to switch to the "Setup" page.
8. On the "Setup" page, press the key labeled CALB to enter calibration mode. This will take a couple
of seconds.
9. The MX20 will flash all faults briefly to indicate calibration mode has been entered. If this fails,
turn power off and try again.
At this point, follow directions in the ART2000 Installation Manual starting with "400 Hz Ref Gain"
section. Selection of calibration parameters is done by adjusting the gain setting according to the values in
the ART2000 Installation Manual. On the MX20, the "smart keys" labeled "Gain" are used to adjust the
gain setting and select the parameter to be calibrated. Follow the ART2000 Installation Manual instructions
for calibrating the selected parameters.
2.9.9.2 MX20 GWX 68 Setup Procedure
2.9.9.2.1 Configuring the MX20
First configure the MX20 for the GWX 68 option. Do this in the normal way by entering the install key
sequence (1, 4, 6) on the menu keys after boot-up is complete. Then press the FN key until the INSTL
smart key appears. Press the INSTL key. Enable RADAR in the FUNC menu-set, then select the DATA
menu-set and select GWX 68. After this selection, wait 30 seconds then turn the power off and on again.
MX20 Version 5.6 or later is required for the GWX 68.
2.9.9.2.2 Calibration Procedures
The following procedure assumes that both analog and ARINC 429 stabilization inputs are present. If one
or the other input is not available, that particular option need not be calibrated.
If the only stabilization source is from an AHRS via ARINC 429, proceed directly to Section 2.9.9.2.2.7.
If an analog stabilization input is used, the radar stabilization source must be removed from the aircraft and
mounted on a tilt table for proper calibration.
Analog stabilization values for pitch and roll can only be adjusted if the GWX 68 senses a 400 Hz
reference input. No adjustment is needed for ARINC 429 input from an AHRS since it is assumed the
AHRS was previously calibrated for level attitude and is transmitting digital deviation values to the GWX
68.
The MX20 must be in the Install mode to calibrate the radar head. Follow the instructions below:
1. Turn the MX20 on.
2. After boot-up is complete, key-in the install sequence 1, 4, 6, on the menu keys.
3. Press the FN key until one of the options is RADAR. If the RADAR option is not available, verify
that the radar function has been enabled as described in Section 2.7.1.
4. Press the smart key corresponding to the RADAR option.
5. Press the STBY key to put the radar unit into standby mode. This may take up to twenty seconds.
6. Once the MX20 is in standby mode, press the TEST key.
7. Once the MX20 is in Test mode, press the ENTER key to switch to the Setup page.
8. On the Setup page, press the key labeled CALB to enter calibration mode. This will take a few
seconds.
MX20 Installation Manual 560-1025-09 Rev E
Installation
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