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plugged into the AUDIO INPUT jacks in the center console jack
panels. Music1 is connected at the AUDIO INPUT jack near the
convenience outlet. Music2 is connected to the jack on the aft console.
Music1 is soft-muted during all airplane radio activity. Music1 and
Music2 have characteristics affected by the active ICS isolation mode.
• Pressing the PILOT ICS Isolation button isolates the pilot from
the copilot and passengers. Music1 is available to copilot and
passengers.
• Pressing the CREW ICS Isolation button isolates the crew from
the passengers and allows the pilot and copilot to listen to
Music1 and the passengers to listen to Music2. Radio activity,
MKR activity, and pilot or copilot ICS activity will mute Music1.
Music2 is not muted.
• When both the PILOT and CREW ICS Isolation mode are not
selected, Music1 is available to crew and passengers. Radio
activity and MKR activity will mute Music1.
Intercom
Intercom controls are located towards the left side of the Audio Control
Panel. The controls consist of a Volume control for the pilot and
copilot, a Squelch control for all occupants, and an Intercom Mode
Selector switch.
Volume & Squelch Control
ICS volume and voice operated relay (VOX) squelch control is
controlled through the left (PILOT) and right (COPILOT) control knobs
on the Audio Control Panel Control. Knob control is as follows:
• Left Inner Knob – On/Off power control and pilot ICS volume.
Full CCW is ‘OFF’ position (click).
• Left Outer Knob – Pilot ICS mic VOX level. CW rotation
increases the amount of mic audio (VOX level) required to
break squelch. Full CCW is the ‘hot mic’ position.
• Right Inner Knob – When pushed in, rotation controls copilot
ICS volume. When out, rotation controls passenger ICS
volume.
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P/N 11934-S01 7 of 10
Cirrus Design Section 9
SR20 Supplements
• Right Outer Knob – Copilot and passenger mic VOX level. CW
rotation increases the amount of mic audio (VOX level) required
to break squelch. Full CCW is the ‘hot mic’ position.
Each microphone input has a dedicated VOX circuit to assure that only
the active microphone(s) is/are heard when squelch is broken. After
the operator has stopped talking, the intercom channel remains
momentarily open to avoid closure between words or normal pauses.
Control
The Audio Control Panel provides an adjustable Voice Operated Relay
(VOX) Squelch Control for the pilot, copilot, and passengers. Since the
VOX circuits reduce the number of microphones active at any one
time, the amount of unwanted background noise in the headphones is
diminished. This also allows the use of dissimilar headsets with the
same intercom. Because the user can adjust the trip level of the VOX
squelch to fit the individual voice and microphone, this helps eliminate
the frustration of clipping the first syllables. There is a slight delay after
a person stops talking before the channel closes. This prevents
closure between words and eliminates choppy communications.
To adjust squelch:
1. With the engine running, set the VOX trip level by slowly rotating
the SQL control knob clockwise until you no longer hear the
engine noise in the headphones.
2. Position microphone near your lips and speak into microphone.
Verify that normal speech levels open the channel.
Intercom Modes
The GMA 340 provides three intercom (ICS) modes to further simplify
workload and minimize distractions during all phases of flight: PILOT,
CREW, and ALL. The mode selection is accomplished using the
PILOT and CREW push-buttons. Pressing a button activates the
corresponding ICS mode and pressing the button a second time
deactivates the mode. The operator can switch modes (PILOT to
CREW or CREW to PILOT) by pressing the desired modes push-
Revision 02: 07-18-05
8 of 10 P/N 11934-S01
Section 9 Cirrus Design
Supplements SR20
button. ALL mode is active when neither PILOT or CREW have been
selected.
The following table shows, in abbreviated form, what each occupant
hears in each of the selectable Intercom modes:
Marker Beacon
The Marker Beacon Receiver provides visual and audio indicators to
alert the pilot when the airplane passes over a 75 MHz transmitter.
Marker beacon controls and lights are located at the extreme left of the
Audio Control Panel.
PILOT The pilot is isolated from the intercom. The pilot can hear
radio and sidetone only during radio transmissions. Copilot
and passengers can hear the intercom and music but not the
　
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