Garmin GNS 480 Installation Manual

Also see for Apollo CNX80: User Newsletter User Newsletter Supplemental Flight manual Pilot's guide Data list

Post-Installation Configuration & Checkout3-6 560-0982-01 Rev A GNS 480 (CNX80) Installation ManualFigure 3-5 - Resolver Calibration PageThe GNS 480 cannot drive multiple resolvers at the same time. It is not recommended that externalresolvers be switched through a relay or other means because the resolver must be calibrated to the radioas described in this procedure. If multiple resolvers are desired in the installation, the primary unit mustbe installed and calibrated as described here. The secondary unit should use the composite output.NOTEThe composite output is limited to the VHF Nav signal and will not be switched to GPSwhen the CDI bezel key is pressed.3.2.1.4 Baro InterfaceThe Baro Interface function lets you to select whether or not a baro-correction potentiometer is installed,and allows an installed potentiometer to be calibrated. It also provides an option to disregard the barocorrection and baro-corrected altitude from an FADC, which may be desirable in certain installations.While on the Ground Maintenance SETUP menu page, press the BARO line select key. Press the topline select key to toggle between INSTALLED (for installations with a baro pot) or NOT INSTALLED(for installations without a baro pot). Press the FADC line select key to toggle between USE (forinstallations where the baro data from the FADC will be used) or IGNORE (for installations where thebaro data from the FADC will not be used). The Baro Interface setup page is shown in Figure 3-6.NOTEDue to priorities of incoming data (refer to 2.5.2.3), the FADC baro data will be usedbefore that of the MX20. If it is desired not to use the baro-correction feature of theFADC source, the FADC BARO/ALT setting should be set to IGNORE.The units that are used may be set using the UNITS line select key to toggle the units between inches Hgand millibars.NOTEChanging the units will only affect the units displayed during calibration. The user canchange the units that are displayed during normal operation via the system configurationpage.