PRIMUSr 1000 Integrated Avionics System
A28--1146--112--00
PRIMUS
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II Radio System
C--34
D COM1, COM2, COM3, and HF Microphone Switches -- These
switchesareusedtoconnecttheon--side cockpitmicrophonetothe
selected transceiver. The received audio from the selected
transceiver is routed to the on--side speaker or headphone at an
internally preset level, regardless of the setting of the COM or HF
audio source (on/off/volume) control located below the switches.
Thereceivedaudiocanthenbe adjustedasdesired,usingtheaudio
source control.
D Audio Source (COM, HF, NAV, ADF, and DME) Controls -- Each
control functions as an audio connect/disconnect switch and a
volume control. The audio is connected and the volume can be
adjusted when the control is in the unlatched (out) position. The
audioisdisconnectedfromtheon--sidespeakerorheadphonewhen
the control is in the latched (in) position.
D Passenger Address (PAX) Microphone Switch -- When the PAX
button is pushed, the on--side microphone is connected directly to
the passenger address audioamplifier,independentof powerbeing
appliedtotheaudio panel.Passengeraddresssidetoneisinternally
generated within the audio panel. Headphone sidetone volume is
controlled by the sidetone (S.T.) and headphone (HDPH) volume
controls. ThespeakersidetonevolumeiscontrolledbytheS.T)and
speaker(SPKR)volumecontrols.Duringaudiopanelpowerloss,no
sidetones are available. During passenger address operations, all
other audio outputs, except warning audios, are deselected.
D Emergency(EMER)Microphone Switch--Whenany audiopanel
EMER button is pushed, the on--side microphone is connected
directly to the No. 2 VHF COM and the No. 2 VHF COM received
audio is connected directly to the on--side headphone. The No. 2
VOR/ILSaudioisalsoconnecteddirectlytotheon--sideheadphone
if it has been selected by the NAV AUDIO button on the tuning
backup control head. When EMER is selected, headphone volume
is controlled by the on--side HDPH volume control. The EMER
button disables all other audio panel controls.
D BOOM/MASK Switch -- When this switch is in the latched (in)
position, the headphone microphone is selected. When the switch
is in the unlatched (out) position, the oxygen mask microphone is
selected.
D ID/VOICEControl--The ID/VOICEcontrolisused tofiltertheVOR
and ADF audio signals. In the ID latched (in) position, the control
enhances Morse code identification. In the VOICE unlatched (out)
position, the audio is filtered to reduce the Morse code signal for
received VOR/ILS audio. ADF audio is unaffected when theVOICE
mode is selected.
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