The installation of
Cessna
radio
equipment
provides
certain
audio
back-up capabilities and
transmitter
selector
switch functions
that
the
pilot should be
familiar
with. When the
transmitter
selector
switch
is
placed in position 1
or
2,
the audio
amplifier
of the
corresponding
trans-
ceiver is utilized to provide the
speaker
audio
for
all
radios.
If
the audio
amplifier
in
the
selected
transceiver
fails,
as
evidenced by
loss
of
speaker
audio for
all
radios,
place the
transmitter
selector
switch
in the other
transceiver
position. Since an audio
amplifier
is
not
utilized
for
head-
phones, a malfunctioning amplifier will not affect headphone operation.
SPEAKER
PHONE SWITCHES.
The·
s
'
peaker-ph~~e
switches
determi
,ne
whether
the
~utput
of the
receiver
in use
is
fed to the headphones
or
through the audio amplifier
to the
~p~aker.
Place
the
swit
.ch
for
the.
desired
receiving
system
·either
in
the
up
position for
speaker
operation
or
in the down position
for
head-
phones.
MICROPHONE~HEADSET
A microph_one-headse.t combination
is
offered
as
optional equipment.
Using the microphone-headset and a microphone keying switch
on
the left
side
of
the
pilot's
·control wheel, the pilot
can
conduct
radio
communica-
tions. without interrupting .
other
·Control
operations
to haridle a hand-held
microphone. Also,
passengers
need not
liste
·n to
all
communications.
The microphone and
headset
jacks
are
located
n~ar
the lower
le°ft
corner
of
the instrument panel. : · ·, ·
7-4
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