Garmin APOLLO GX SERIES, Service Manual

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Garmin AT Rev --
7-20 GX Service Manual © 2004 Garmin AT
Comm Software System Functions
The following software functions are available in the normal operating mode and are provided here as
information to assist in isolating problems:
Comm Software Version 1.X Comm Software Version 2.X
Software version display Software version display
Signal strength display Signal strength display
Audio noise level display Audio noise level display
Headphone level display and adjustment Microphone 1 VOX
Microphone 2 VOX
Intercom squelch threshold display and
adjustment Microphone transmit inhibit
Intercom audio level display and adjustment Intercom level adjust display and adjustment
Sidetone audio level display and adjustment Sidetone audio level display and adjustment
Base station lockout mode display and
adjustment Low display light level adjustment limit
Hi display light level adjustment limit
The system settings are enabled by pressing the NAV button for about three seconds. The LED
above the NAV button will turn off. Rotate the large knob to select the function. The software
version page will be the initial display.
The front panel buttons will operate normally during display of the system functions. Pressing any
button will revert back to the normal mode defined for the button. The receiver will also operate
normally during display of the system functions.
System Functions for Software Version 1.X:
Software Version Display
This function displays the COM software version.
SW VER 1.X
Signal Strength Display
This function is used to display the signal strength of received signals.
RFLVL 087
Full transceiver functions are operational during this function, including transmit.
Note:
The RF signal strength is an 8-bit value with a range of 0 to 255 from the IF/RF AGC
voltage as read into the µcontroller through an A/D input.
Audio Noise Level Display
This function is used to display the noise level of the received audio.
NOISE 005