Garmin G1000 Cockpit Reference Guide for Cessna Nav III64SECTION 4 – AUDIO PANELPressing the COM1 or COM2 receiver key selects theCOM radio as an active receiver source. Any combina-tion of radios can be selected separately or simultaneouslyregardless of the active transceiver selection. The activeCOM radio is always heard through the headsets.Figure 4-2 TransceiversTransmittingWhen a transmitter is keyed, the active transceiverMIC key annunciator blinks approximately once per sec-ond. A white TX indication appears next to the activeCOM frequency on both the PFD and the MFD duringtransmission.NOTE: Audio level of the COM radio(s) is con-trolled by the COM volume controls located onboth the PFD and MFD (see the VHF NAV/COMPilot’s Guide).Optional COM MutingThe COM muting on receive and COM muting ontransmit options can each be disabled in configurationmode. When COM muting on receive is enabled, all sec-ondary COM audio is muted upon detection of a receivedprimary COM signal. When COM muting on transmit isenabled, all secondary COM audio is muted during trans-mission over the primary COM radio.PA FunctionA passenger address function is provided by pressingthe PA key. Push-to-talk (PTT) must be used to deliver PAannouncements over the headsets.Cabin SpeakerAll of the radios can be heard over the cabin speaker.Pressing the SPKR key selects and deselects the cabinspeaker. Speaker audio is muted when the PTT switchis keyed.The speaker volume is adjustable above and below anominal value. Contact a Garmin-authorized service cen-ter for details.
