Icom ic-775 Service Manual page 7

•
OPTIONAL
FILTER
After installing
optional
filters,
the transceiver has
3* kinds
of
selectivity for
2nd and
3rd
IF filters
to
provide
better
S/N
(signal-to-noise ratio),
or to reject
nearby
interference.
*
FM
mode: 2 kinds
of selectivity
Following optional
filters
are available.
IF Filter
Passband width Used
selectivity
2nd
FL-101
250
Hz/-6dB
CW
nar.
FL-102
6.0
kHz/-6dB
SSB
wide,
AM
med.,
FM
nar.
FL-223
1.9
kHz/-6 dB
SSB
nar.
3rd
FL-53A 250
Hz/-6dB
CW
nar.
FL-222
1.9
kHz/-6 dB
SSB
nar.
When
only
1 filter
is
installed for selectivity,
such as a
FL-101
installed
but
no FL-53A
installed,
optimum
perform-
ance cannot be
obtained
for
the selectivity
and
the twin
PBT
function
does
not
operate
correctly.
Both
filters,
such
as FL-101
and
FL-53A, should
be
installed.
FILTER
SELECTION
After
the
filter(s)
are installed,
activate the optional
m
filter(s) in
H-set
mode.
If
this
is
not
correctly set,
the
^
installed filter(s)
cannot
be
selected.
I
®
Remove
the top
and bottom
covers as described
on
p.
2-1.
@
Insert the
filter(s)
to
the proper
position.
The
locations
are
shown
in
the
figures
below.
-The FL-53A and FL-222 must be
installed
in
the
proper
direction.
-The
FL-101,
FL-102
or
FL-223 work
regardless of the
direction
they are
installed
in.
d)
Replace
the top
and bottom
covers.
FL-102
(or
FL-101, FL-223) Installation
•
UT-66
VOICE SYNTHESIZER UNIT
The UT-66 announces
the operating
frequency or selected
mode
in
a
clear,
electronically-generated voice
(in
English
or
Japanese).
®
Remove
the top cover as described on
p.
2-1
.
(D Plug the
UT-66
into J1
on the
MAIN
unit
(backside of
the
S/RF
meter)
as
shown
in
the
figure at
right.
@
Replace
the top cover.
0
Set the
language and speech speed
in
H-set
mode.
2-3