190-01115-01 G3X™/G3X Touch™ Avionics Installation Manual
Rev. AV Page 23-65
23.16.8 Music Inputs
The music inputs are noise rejecting and have a nominal input impedance of 600 Ω. The max. rated input
level is 1.5 Vrms. The MUSIC LO must be connected to the music source along with MUSIC RIGHT and
MUSIC LEFT. If MUSIC LO is not connected, music volume will be low (or inaudible), noisy, and
distorted.
23.16.9 Receiver Audio
RECEIVER AUDIO OUT is a 40 mW audio output that is intended to drive a recording device or an audio
panel.
RECEIVER AUDIO OUT supplies 40 mW (4.9 Vrms) into a 600 load, and is generally connected to the
audio panel (if used). This output can also drive a recording device. When driving a recording device the
output level will typically need to be reduced. The output level is controlled through configuration mode.
RECEIVER AUDIO OUT is the summation of the receiver audio, COM sidetone audio, intercom audio,
and AUX audio.
23.16.10 Pilot/Copilot PTT Inputs
When pulled low, these inputs allow the audio that is present on the PILOT/COPILOT MIC IN to be
transmitted over the radio.
Active-Low discrete inputs are considered active if either the voltage to ground is ≤3.5 VDC or the
resistance to ground is ≤375 .
These inputs are considered inactive if the voltage to ground is 6.5-33 VDC or the resistance to ground is
>100 k.
Pin Name Pin I/O
MUSIC IN RIGHT 18 In
MUSIC IN LEFT 19 In
MUSIC LO 37 --
Pin Name Pin I/O
RECEIVER AUDIO OUT HI 10 Out
RECEIVER AUDIO LO 29 --
Pin Name
Pin I/O
PILOT PTT* 35 In
COPILOT PTT* 15 In
*Indicates Active Low
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