Post-Installation Configuration & Checkout
3-8
560-0982-01 Rev A
GNS 480 (CNX80) Installation Manual
3.2.1.5 Com
Radio
The Com Radio Setup function is used to modify the RF Squelch and Mic Gain levels. Typical values
from the factory are RF Squelch = 56 and Mic Gain = 255, which are satisfactory for most installations.
The RF Squelch value is used by the Com function to control its squelch level. The larger the value that
is set the stronger the signal must be in order for the radio to break squelch.
To edit the RF Squelch
value, press the
EDIT RF SQUELCH
line select key. Turn the small, inner knob to adjust the squelch
value (the RF Squelch value is restricted to a number from 25 to 100). When the desired value is
selected, press the
MENU/ENTER
key or the
SAVE
RF SQUELCH
line select key to save the setting.
The microphone gain is used by the Com function to control the microphone pre-amplifier gain. The
larger the value that is set the higher the pre-amplifier gain is. To edit the Mic Gain value press the
EDIT
MIC GAIN
line select key. Turn the small, inner knob to adjust the gain value (the Mic Gain value is
restricted to a number from 0 to 255). When the desired value is selected, press the
MENU/ENTER
key
or the
SAVE
MIC GAIN
line select key to save the setting.
Figure 3-8 - Com Radio Setup
3.2.1.6 Miscellaneous Setup Items
The Misc Setup function is used to configure the unit to ignore the CDI select bezel key and CDI select
discrete input (refer to 2.8.9.1). While on the Ground Maintenance SETUP menu Page 2, press the
MISC
line select key. Press the
CDI SEL
line select key to toggle between USE (for installations that
will utilize the GNS 480 CDI bezel key to switch between Nav and GPS) or IGNORE (for installations
where it is desired that the CDI bezel key be inoperative). If the CDI Select is set to IGNORE, the field
beside the CDI key will always be GPS, regardless of CDI key presses. When set to IGNORE, the main
analog CDI output (refer to 2.8.2) will always output VOR/ILS information, even though GPS
information will be displayed in the CDI window and ‘GPS’ will be annunciated beside the CDI key. The
Misc Setup page is shown in Figure 3-9.
NOTE
It may be necessary to disable (IGNORE) the GNS 480 CDI select key for installations
with certain EFIS systems, where the navigation sensor selection must be accomplished
on the EFIS or its control panel.
Summary of Contents for GNS 480
Page 1: ...GNS 480 CNX80 Color GPS Nav Com Installation Manual September 2004 560 0982 01 Rev A...
Page 10: ...Table of Contents viii 560 0982 01 Rev A GNS 480 CNX80 Installation Manual NOTES...
Page 30: ...General Information 1 20 560 0982 01 Rev A GNS 480 CNX80 Installation Manual NOTES...
Page 126: ...Periodic Maintenance 6 2 560 0982 01 Rev A GNS 480 CNX80 Installation Manual NOTES...
Page 150: ...Appendix D Interconnect Diagrams D 2 560 0982 01 Rev A GNS 480 CNX80 Installation Manual NOTES...
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