____________________________________________________________________
Page 5-64
Cirrus Perspective™ Line Maintenance Manual
Rev. E
190-00920-00
6.
Turn
off
the
PFD
and
MFD
by
pulling
their
circuit
breakers.
7.
Restart
the
PFD
and
MFD
in
Configuration
Mode.
8.
On
the
PFD,
turn
to
the
COM
SETUP
page.
9.
Activate
the
cursor
and
select
the
desired
tuning
frequency
using
the
FMS
knobs.
Only
the
frequencies
118.00,
127.00,
&
136.975
may
be
used
when
setting
squelch
and
sidetone
levels.
10.
Select
GIA1
or
GIA2
in
the
COM
Setup
window.
This
forces
an
update
of
the
calibration
data
values
and
must
be
accomplished
prior
to
making
any
changes.
Failure
to
do
so
may
allow
COM
calibration
values
to
be
inadvertently
stored
into
incorrect
memory
locations
requiring
GIA
replacement.
11.
For
25kHz
operation,
adjust
the
SQ
250
value.
It
may
be
set
to
any
value
between
0
(zero)
and
63.
The
higher
the
number,
the
less
signal
is
required
to
break
squelch.
12.
For
8.33kHz
operation,
adjust
the
SQ
833
value.
It
may
be
set
to
any
value
between
0
(zero)
and
63.
The
higher
the
number,
the
more
signal
is
required
to
break
squelch.
13.
After
the
squelch
value
is
adjusted
to
the
desired
number,
press
the
STORE
softkey
at
the
bottom
of
the
display
to
save
the
value
to
the
GIA.
14.
Repeat
steps
7
‐
11
for
tuning
additional
frequencies.
Summary of Contents for Cirrus Perspective SR20
Page 2: ......