190-00820-08 Rev. A
Cirrus Perspective
™
by Garmin – Pilot’s Guide for the SR20/SR22/SR22T
148
AUDIO PANEL AND CNS
SY
STEM
O
VER
VIEW
FLIGHT
INSTRUMENTS
EIS
AUDIO P
ANEL
& CNS
FLIGHT
MANA
GEMENT
HAZARD
AV
OID
ANCE
AFCS
ADDITIONAL FEA
TURES
APPENDICES
INDEX
Pilot isolation is selected when the PILOT Annunciator is illuminated. During Pilot isolation, the pilot can
hear the selected radios and aural alerts and warnings. The copilot and passengers can communicate with each
other. The copilot is isolated from aural alerts and warnings.
Copilot isolation is selected when the COPLT Annunciator is illuminated. The copilot is isolated from the
selected radios, aural alerts and warnings, and everyone else. The pilot and passengers can hear the selected
radios, aural alerts, and communicate with each other.
When both the PILOT and COPLT Annunciators are illuminated, the pilot and copilot can hear the selected
radios, aural alerts, and communicate with each other. The passengers are isolated from the pilot and copilot
but can communicate with each other.
When both the PILOT and COPLT Annunciators are extinguished, everyone hears the selected radios, aural
alerts, and is able to communicate with everyone else.
INTERCOM VOLUME AND SQUELCH
Two volume controls, one for the pilot and a combined copilot/passenger control, set intercom audio level.
Each microphone input has an automatic squelch threshold. Manual squelch is available by pressing the
Pilot side
VOL/SQ
knob. When the MAN SQ annunciation is lit the large squelch knobs control pilot and
copilot/passenger squelch threshold. Turning either knob clockwise increases the squelch threshold level.
Turning either knob counterclockwise decreases the squelch threshold level.
When the MAN SQ annunciation is not lit, squelch is automatic and the large squelch knobs have no
function.
Figure 4-49 Intercom Volume and Squelch Controls
Copilot/Passenger Volume and Manual Squelch
Pulling the right volume
knob controls passenger
volume, pushing in controls
Copilot volume. Copilot and
passenger share the large
squelch knob.
Pilot Volume, On/Off, and Manual Squelch
Manual Squelch Annunciation;
Off for Automatic Squelch, On
for Manual Squelch
Rotating the Pilot Volume Knob
controls ON and OFF function.
(Full CCW detent is OFF)
Pressing the Pilot volume knob
switches between manual and
automatic squelch.
SPLIT COM WITH THE GMA 347
NOTE:
Split COM performance is affected by the distance between the COM antennas and the separation
of the tuned frequencies. If the selected COM1 and COM2 frequencies are too close together, interference
may be heard during transmission on the other radio.
During
Split COM operation, both the pilot and the copilot can transmit simultaneously over separate radios.
The pilot can still monitor NAV1, NAV2, ADF, DME, and MKR Audio as selected, but the copilot is only able
to monitor COM2.
Pressing the
COM 1/2
Key selects Split COM operation. The COM 1/2 Annunciator is illuminated indicating
Split COM operation. COM1 and COM2 frequencies are displayed in green indicating that both transceivers
Summary of Contents for Cirrus Perspective SR20
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