Garmin MX20 Installation Manual - page 47
Installation
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MX20 Installation Manual
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.
2.9.9.2.2 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.”
10. From here you may follow the manufacturer’s calibration instructions and procedure or set the roll/trim
parameter. Remember that the antenna is radiating during the setting of roll/trim.
11. To return to test mode and the test-pattern display, press the “MENU/ENTER” key. Once you return to
test mode, calibration mode is disabled.
12. So each time you return to test mode and the test pattern, and then return to the R/T Calibration SETUP
page (by pressing the “MENU/ENTER” key, you will need to press the “CALB” key again to enter
calibration mode.
2.9.9.2.3
Setting Roll/Trim
When setting roll trim, after returning to r/t calibration (setup) page, it is important to wait 30 seconds then
power-off. Do not attempt to re-enter calibration mode or use the unit without cycling the power.
2.9.9.3 Ground Based Checkout Procedures
2.9.9.3.1 Radar Test Mode Checkout
Turn power on to the MX20 I/O and radar antenna assembly. After the MX20 I/O self-tests are completed,
enter the Radar Function by pressing the FN key until the RADAR menu option is available. Then, press the
corresponding RADAR "smart key."
(If the Radar Function is not available, verify that the MX20 is an I/O model and that the radar function has
been enabled as described in previous sections).
The RADAR should remain in the off state with no scanning occurring when the Radar Function is entered
for the first time.