Digital Audio Control Panel (Figure 5-16) - BOMBARDIER LEARJET 40 Pilot's Manual

Pilot's Manual
One knob, labeled DME, controls the audio reception for both DME 1
and DME 2. When the DME knob is unlatched (out position) and the
arrow on the knob is centered straight up, the audio level is at a mini-
mum. Rotating the control knob in either direction toward 1 or 2 will
increase the volume for that corresponding channel only. The audio
level pointers on the knobs are displayed for night flight. There are sep-
arate controls for speaker volume and headphone volume which adjust
the volume level for all audio buttons selected. The speaker push-on/
push-off selector is combined with the sidetone knob. When the speak-
er switch is extended, it turns on audio to the on-side speaker. The
speaker sidetone audio is controlled by the speaker SIDETONE volume
control and the SPEAKER volume control for both on-side and off-side
transmit conditions.
SPKR
ON
DIGITAL AUDIO CONTROL PANEL
Figure 5-16
The ID/BOTH/VOICE switch is located on the right side of the audio
panel. In the ID position, the VOR and ADF audio is filtered to enhance
the Morse Code identification and eliminate the voice signal. In the
VOICE position, the ident audio is filtered to pass the voice content
only and in the BOTH position, voice and ident signals will be heard
simultaneously.
The controls for the marker beacon receiver are located at the bottom of
the audio panel. They include the marker audio volume control (MKR),
marker sensitivity control (LO SENS/HI SENS) and marker mute con-
trol (MUTE). The sensitivity is controlled by the rotation of the MUTE
control. If either audio panel MKR sensitivity control is set LO, then
both MKR receivers are set to LO, regardless of the position of the other
audio panel controls. Either pilot can temporarily mute the marker bea-
con receiver by depressing the MUTE/HI/LO switch.
5-61
PM-132A