Garmin Apollo CNX80 Installation Manual page 96

Post-Installation Configuration & Checkout
3.3.2.3.2 Receiver / Transmitter Operation
Press the COM bezel key to allow control of the VHF com transceiver. Tune the unit to a local frequency
and verify the receiver output produces a clear and understandable audio output. Verify the transmitter
functions properly by contacting another station and getting a report of reliable communications. Check the
operation of remote com flip/flop switch (if installed). If necessary, adjust the RF Squelch and Mic Gain
values as describe in 3.2.1.5.
3.3.2.3.3 Sidetone Level Adjustment
The sidetone volume was preset at the factory to a typical audio level. The level can be adjusted as follows:
1. Press the COM bezel key to allow control of the VHF com transceiver.
2. Press the MENU/ENTER key to display the com menu, and press the AUDIO line select key to display
the volume adjustment window.
3. Rotate the large, outer knob to select the Sidtone item.
4. Rotate the PWR/VOL knob or the small, inner knob to adjust the sidetone level. The sidetone level is
displayed as a horizontal bar, showing the level from zero to 100%. The sidetone level can be adjusted
during transmit.
5. Press the MENU/ENTER key when done.
3.3.2.4 Interface Checkout
This section describes checks that can be carried out to verify that systems interfacing to the CNX80 are
communicating properly.
3.3.2.4.1 CNX80 Message Audio
The CNX80 can annunciate audio messages through an audio panel. This check verifies that the audio
connection from the CNX80 to the audio panel is functional. Prior to proceeding with this check, ensure
that the audio panel is set to annunciate the CNX80 message audio. If the following steps do not perform
correctly, check the electrical connections and AMA volume setting.
1. Go to the System Configuration page. This page is accessed by pressing the FN key repeatedly until
the SYS smart key is displayed. The SYS smart key is then pressed, followed by the CNFG smart
key, if necessary.
2. While on the System Configuration page, rotate the large, outer knob to scroll down to the Msg Tone item
and verify that it is set to ON. If it is set to OFF, push the small, inner knob in to edit the setting and rotate
the small, inner knob to change the setting to ON. Press the MENU/ENTER key to accept the setting.
3. Rotate the large, outer knob and scroll up to the Mag Var setting. Press the small, inner knob in to edit
the setting and rotate the small, inner knob to change the setting to MANUAL. As soon as the setting is
changed to MANUAL the CNX80 will display a "Using Manual Mag Var" message and play the message
tone. Verify that this tone is heard over the audio system.
4. If necessary, adjust the Message Audio volume level as described below and replay the tone to verify the new
setting.
5. Return the Mag Var setting to AUTO.
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