Cessna Cardinal RG 1974, Owner'S Manual

Page: 165 / 226

Cessna Aircraft Company
Model 177RG Supplement No.
DP-014-17
Section 9
Supplements Page 9
Revision 0
SPEAKER OUTPUT: Pressing the SPKR button (12) selects
Aircraft radios over the cabin speaker. The speaker output is
muted when a COM microphone is keyed. Speaker level is
adjustable through an access hole in the top of the unit.
PA FUNCTION: The PA mode is activated by pressing the PA
button (11). Then, when either the pilot’s or copilot’s
microphone is keyed, the corresponding mic audio is heard
over the cabin speaker. If the SPKR button (12) is also active,
then any selected speaker audio is muted while the
microphone is keyed. The SPKR button does not have to be
previously active in order to use the PA function. Pilot and
copilot PA microphone speaker levels are adjustable through
an access hole in the top of the unit.
AUXILIARY ENTERTAINMENT INPUTS: The GMA 340 and
340H provide two stereo entertainment inputs: MUSIC 1 and
MUSIC 2. MUSIC 1 is soft-muted during all aircraft radio
activity and normally during ICS activity. MUSIC 2 is a non-
muted input. These inputs are compatible with popular
portable entertainment devices such as cassette tape or CD
players. The headphone outputs of these devices are used
and plugged into MUSIC 1 or MUSIC 2. Two 3.5 mm stereo
phone jacks should be installed in a convenient location for
this purpose. MUSIC 1 and MUSIC 2 have characteristics that
are affected by the active intercom mode
INTERCOM SYSTEM (ICS): Intercom volume and squelch
(VOX) are adjusted using the following front panel knobs:
UNCONTROLLED
COPY
WHEN
DONLOADED