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to the transmitter
the
pilot
has selected
for use.
To
accomplish
this,
in-
terlocking transmitter
selector
switches
labeled
TR 1
and
TR
2
are
provided.
TR 1 selects
the
upper
transmitter
and TR
2 selects
the
lower
transmitter.
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
labeled
TR 1 or TR
2
is
depressed,
the
audio
amplifier
of
the
corres-
ponding
transceiver
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,
depress
the transmitter
selector
switch
for
the transceiver
not in use.
Since an audio
amplifier
is not
utilized
for
headphones,
a
malfunctioning
amplifier
will not affect
head-
phone
operation.
S
PE A KE
R-P HONES WIT
CH
ES.
The speaker-phone
switches
determine
whether
the
output
of
the
receiver
in use is fed
to the
headphones
or
through the
audio amplifier
to the
speaker.
Depress
the
switch
for
the
desired
receiver
to
obtain
speaker
operation,
or release
it if headphone
operation
is
desired.
MICROPHONE-HEADSET
A
microphone-headset
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
handle
a hand-held
microphone.
Also,
passengers
need not listen
to
all communications.
The microphone
and
headset
jacks
are located
near
the
lower
left corner
of
the
instrument
panel.
7-5
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