Basic Operation; Rit/Af Function; Split Operation - Icom IC-725 Instruction Manual

5
BASIC OPERATION
5-5
RIT/Af
FUNCTION
By
using the
RIT
function,
it is
possible to
shift
the receive
frequency
up to ±1
kHz
on 10
Hz
steps
without moving the
transmit frequency. This
is
useful for fine tuning stations
which
transmit using off
frequency
or for
compensating
for
frequency
drift.
The
IC-725 has
an added
feature:
the
RIT
shift
frequency
can be
added
to the displayed frequency.
1)
Push the [RIT] switch to
activate
the
RIT
function.
•
"RIT"
appears
on
the
FUNCTION
DISPLAY.
2)
Rotate the
RIT
control.
• Clockwise rotation
Increases
frequency
• Counterclockwise rotation
:
Decreases
frequency
1
)
Set the
frequency and
mode
for
21.2500
MHz
and
USB
in
VFO A
mode.
2)
Set the frequency and
mode
for
21.3600
MHz
and
USB
in
VFO
B mode.
3)
Push the
[VFO]
switch to
select
VFO A
mode.
4)
Push the [SPLIT]
switch.
5)
Push either the
PTT
or
[TRANSMIT]
switch to transmit.
•
You
are transmitting
on 21.3600
MHz
in
USB mode
and
receiving
on 21.2500
MHz
in
USB
mode.
6)
To
change
the transmit
and
receive
frequencies
in
the
split
operation,
push
the
[VFO]
switch to
select
the
VFO
B
indicated.
3)
To
add
the
RIT
shift
frequency
to the displayed
fre-
quency, push the
[FUNC]
switch then push the [RIT]
switch.
•
The
displayed
frequency
changes.
•
"RIT"
disappears.
4)
To
clear
the
RIT
shift
frequency, push the [RIT] switch.
•
"RIT"
disappears.
5-6 SPLIT
OPERATION
Split
operation allows
you
to transmit
and
receive
on two
different frequencies.
The
IC-725 provides
split
operation using
either
of the
following
two
methods:
(1)
Using the contents
of
VFO A
and
VFO
B
in
VFO
mode.
(2)
Using
memory
channel
23
or
24
in
MEMORY
mode.
(1)
USING
VFO A AND
B
MODES
Split
operation
is
possible using
the contents of
VFO A
and
VFO
B
in
VFO
mode.
Following
is
an example
for
21.2500
MHz
/
USB
for
receiv-
ing
and 21.3600
MHz
/
USB
for transmitting using
split
operation.
VFO A
:
Displayed frequency
for receiving
USB
zi
i
z*c
n
nn
vfoa
z*c
L I.LUIU.UU
CO
VFO
B
:
Transmit frequency
USB
.r/
/
~/c
n nn
VF
o
B
z*i
L l.-IUU.UU
CO
(2)
USING
MEMORY
CHANNEL
23
OR
24
Memory
channels
23 and 24 can
memorize
both transmit
and
receive frequencies. This
is
useful for selecting
the
most
often used
split
frequencies.
Following
is
an
example
for
21.2500
MHz
/
USB
for
receiv-
ing
and 21.3600
MHz
/
USB
for transmitting using
split
operation.
• How
to
memorize
split
frequencies
into
memory
channel
23
1)
Select
VFO A
mode
and push
the [UP] or
[DOWN]
switch to
select
memory
channel
23.
2)
Push the [SPLIT]
switch.
•
"SPLIT"
appears.
3) Set the
frequency and
mode
to
21.2500
MHz
and
USB
and push the
[MW]
switch to
memorize
the information.
4)
Push the
[VFO]
switch to
select
VFO
B mode.
5)
Set the
frequency and
mode
to
21.3600
MHz
and USB,
and push
the
[MW]
switch to
memorize
the information.
• How
to operate the
split
frequencies
1)
Push the
[MEMO]
switch to select
MEMORY
mode
and
push
the
[UP]
or
[DOWN]
switch to
select
memory
channel
23.
2)
Push the [SPLIT]
SWITCH.
•
"SPLIT"
appears.
3)
Push
either
the
PTT
or
[TRANSMIT]
switch to transmit.
•
You
are
transmitting
on 21.3600
MHz
in
USB mode
and
receiving
on 21.2500
MHz
in
USB
mode.
4)
To
reverse
the transmit
and
receive frequencies,
follow
the steps
above
for
memorizing
frequencies, reversing
the
VFOs.