Cessna Cardinal RG 1974, Owner'S Manual, Page: 166 / 226

Cessna Aircraft Company
Model 177RG Supplement No.
DP-014-17
Section 9
Supplements Page 10
Revision 0
• LEFT SMALL KNOB - Unit on/off power control and Pilot ICS
volume (5). Full CCW DETENT position is OFF.
• LEFT LARGE KNOB - Pilot ICS mic VOX squelch level (6).
CW rotation increases the amount of mic audio (VOX level)
required to break squelch. Full CCW is the “hot mic” position.
• RIGHT SMALL KNOB - IN position: Copilot ICS volume.
OUT position: Passenger ICS volume (7).
• RIGHT LARGE KNOB - Copilot and passenger mic VOX
squelch level (8). CW rotation increases the amount of mic
audio (VOX level) required to break squelch. Fully CCW is the
“hot mic” position.
Each microphone input (six total) has a dedicated VOX circuit
to ensure that only the active microphone(s) is/are heard when
squelch is broken. This represents a vast improvement over
single-gate systems and reduces the amount of background
noise in the headphones during cockpit communications. After
the operator has stopped talking, the intercom channel
remains momentarily open to avoid closure between words or
normal pauses. The GMA 340 provides three intercom modes:
PILOT, CREW and ALL. The mode selection is accomplished
using the PILOT (10) and CREW (9) buttons. Pressing a
button activates the corresponding ICS mode. Pressing again
deactivates the mode. The operator can switch directly from
PILOT to CREW or from CREW to PILOT by pressing the
other mode button. ALL mode is active when neither PILOT or
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