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(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
airplane radio receptions or pilot transmissions.
CREW Pilot and copilot are connected on one intercom channel and
have exclusive access to the aircraft radios. They may also
listen to Music1. Passengers can continue to communicate
with themselves without interrupting the Crew and also may
listen to Music2.
ALL All parties will hear the aircraft radio, intercom, and Music1.
The music volume increases gradually back to the original
level after communications have been completed. Both pilot
and copilot have access to the COM transceivers.
Mode Pilot Hears Copilot Hears Passenger Hears
PILOT A/C Radios
Pilot
Passengers
Copilot
Music1
Passengers
Copilot
Music1
CREW A/C Radios
Pilot/Copilot
Music1
A/C Radios
Copilot/Pilot
Music1
Passengers
Music2
ALL A/C Radio
Pilot/Copilot
Passengers
Music1
A/C Radio Pilot/
Copilot
Passengers
Music1
A/C Radio
Pilot/Copilot
Passengers
Music1
Revision 02: 07-18-05
P/N 11934-S01 9 of 10
Cirrus Design Section 9
SR20 Supplements
Marker beacon audio is selected by pressing the MKR push-button. If
no marker beacon signal is being received, pressing the MKR pushbutton
a second time deselects marker beacon audio. However, if
marker beacon is being received, pressing the MKR push-button a
second time will mute the audio but the light will continue to flash.
Pressing the MKR push-button a third time (while marker beacon
audio is muted) deselects marker beacon audio. Marker beacon audio
muting automatically disables when the current signal is no longer
received.
• Note •
The marker beacon lamps (O, M, A) operate independently of
the audio and cannot be disabled.
Marker beacon light and audio keying for ILS approach are
summarized below:
Marker Beacon Sensitivity
The SENS push-button on the left side of the panel is used to set the
marker beacon receiver sensitivity. The selected sensitivity level is
indicated by illumination of the HIGH or LOW LED. When HIGH
sensitivity is selected, the outer marker beacon tone will sound farther
out. Selecting LOW sensitivity at this point allows more accurate
location of the Outer Marker. Typically, HIGH sensitivity is selected
until the outer marker tone is heard, and then LOW sensitivity is
selected for more accurate outer marker location.
O (Blue) Outer Marker light and associated 400 Hertz tone. The
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西锐20飞机信息手册 SR22 AIRPLANE INFORMATION MANUAL 1148-126(93)
