Garmin MX20 Installation Manual page 52

Installation
7. Adjust the range and tilt controls so that ground returns are painted past approximately half of the
selected range.
8. Press they key labeled STBY. The radar will return to standby mode.
9. Once the MX20 is in standby mode, press the TEST key.
10. Once the MX20 is in Test mode, press the ENTER key to switch to the Setup page.
11. On the Setup page, press the key labeled CALB to enter calibration mode. This will take a few
seconds.
12. The MX20 will flash all faults briefly to indicate calibration mode has been entered. If this fails,
turn power off and on and repeat the procedure.
13. Press the key labeled ROLL TRIM.
14. Acknowledge the safety warning that appears. The radar will begin transmitting.
15. Adjust the roll trim setting until the range at which ground returns begin remains approximately
constant across a full scan of the display.
16. Press the key labeled SAVE & EXIT. Wait until the warning disappears, then power cycle the
MX20.
2.9.9.3 RS-181A Configuration and Calibration
2.9.9.3.1 RS-181A Configuration
First configure the MX20 for the RS181 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. Enable "RADAR" under the "FUNC" menu-
set, then select the "DATA" menu-set and select the "RS181" choice. After selection, wait 30 seconds then
turn the power off and on again.
To configure the "Radar Indicator" push the "MISC" smart key and press "NEXT PAGE" line key twice.
Press the line key next to "RADAR INDICATOR" until the desired selection is shown. The choices are 1,
2 or All. This number corresponds to the port number on the ART that is connected to the MX20. After
selection, wait 30 seconds then turn the power off and on again.
2.9.9.3.2 RS-181A Calibration and Roll/Trim
1. Turn the MX20 on and wait until the startup page is completely drawn. When the green labels on the
smart keys (buttons at bottom) appear, it's complete.
2. Press menu keys 1, 4, 6 to enable install mode. (buttons on right-hand side numbering from top to
bottom)
3. Next press the "FN" key until the "RADAR" label appears, then press that key. This will cause a
switch to the "RADAR" page.
4. Press the "STBY/ON" button (top right) on the RADAR page.
5. Wait until the unit has powered-up. 15 to 30 seconds.
6. Three choices should appear on the menu keys: ON, TEST, OFF. Select TEST.
7. A test pattern should appear within a few seconds.
8. Now press the "MENU/ENTER" key (bottom right) to get to the R/T Calibration SETUP page.
9. To enter calibration mode, press the "CALB" menu key. The "CALB" label should turn green and the
text near the bottom of the display should read "Calibration Enabled."
42 560-1025-09 Rev E MX20 Installation Manual