Cessna 182 1973 - Boom Microphone; Speaker-Phone Switches; Autopilot-OMNI Switch

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.
SPEAKER-PHONE
SWITCHES.
The
speaker-phone
switches
such
as
"COM
1",
"NAV
1'""
(400
series
radios),
or
"REC
1",
"REC
2"
(300
series
radios)
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.
AUTOPILOT-OMNI
SWITCH.
When
a
Nav-O-Matic
autopilot
is
installed
with
two
compatible
omni
receivers,
two
autopilot-omni
switches
labeled
"AP
1"
and
"AP
2"
are
utilized.
These
switches
select
the
omni
receiver
to be
used
for
the
omni
course
sensing
function
of
the
autopilot.
This
is
accomplished
by
depress-
ing
the
selector
switch
corresponding
to
the
receiver
which
is
to
be
used.
BOOM
MICROPHONE
A
boom
microphone
may
be
mounted
near
the
upper
left
corner
of
the
windshield.
Use
of
the
boom
microphone
allows
radio
communication
without
the
necessity
of
releasing
any
controls
to
handle
the
normal
hand
microphone.
The
microphone keying
switch
is
a
push
button
lo-
cated
on
the left side
of
the
pilot's
control
wheel.