Operating Procedures; Afsk Terminal Unit Connection; Mic Connector - Icom IC-725 Instruction Manual
Hf all band transceiver
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Also See for IC-725:
- Service manual (67 pages) ,
- Instruction manual (40 pages) ,
- Instruction manual (39 pages)
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SYSTEM
INTERCONNECTIONS
3-4
AH-3
OPERATING
PROCEDURES
The
AH-3
HF
AUTOMATIC ANTENNA TUNER
is
designed
for use
with the
IC-725.
By
pushing the
[TUNER]
switch
on
the IC-725 front
panel,
the
AH-3
tunes
at
50
£2
on
1
.8
MHz
~
30
MHz
with
a
length of
1
2
m
(40
ft)
wire.
The AH-2a
HF
AUTOMATIC ANTENNA TUNER
can
be
used with the IC-725 without the supplied
CONTROLLER
UNIT.
Following
are
the simple operation procedures
for using
the
AH-3
HF
AUTOMATIC ANTENNA
TUNER:
1
)
Connect
cables
from
the
AH-3
and antenna
wire
as
shown
in
the
diagram
on
p. 9.
2)
Turn
transceiver
power ON.
3) Select
the desired
band and
frequency.
-
4)
Push
the
[TUNER]
switch.
•
"TUNE"
flashes
on
the
FUNCTION
DISPLAY.
•
The
AH-3
automatically tunes
at
50
£1.
5)
"TUNE"
steadily
appears
when
the
AH-3
tunes
at
50
£2.
6)
"THRU"
appears
when
the
AH-3
cannot tune
at
50
£2.
•
When
"THRU"
appears, the
AH-3
is
bypassed
and
the
antenna
wire
is
connected
to
the
antenna connector
on
the
IC-725
directly.
7)
When
you want
to
bypass
the
AH-3
manually,
push
the
[FUNC]
switch then
push
the
[TUNER]
switch.
•
"THRU"
appears
on
the
FUNCTION
DISPLAY.
3-5
AFSK TERMINAL
UNIT
CONNECTION
See
p
-
11
for
ACC
(
1
>
and
MIC
connector
pin
information.
When
operating an
AFSK
such
as
RTTY,
AMTOR
or packet,
connect
external
equipment
to the
ACC(1)
SOCKET
on
the
rear
panel or
MIC
CONNECTOR
on
the front panel
as
in
the following
diagram below.
Using the
ACC(1)
SOCKET
(Rear panel view)
Using the
MIC
CONNECTOR
(Front panel view)
AFSK
output
"1
AF
input
SQUELCH
input
PTT
Ground (GND)
AFSK TERMINAL
UNIT
3-6
MIC
CONNECTOR
INFORMATION
(Front panel view)
©MIC
INPUT-
)+8V
DC_
OUTPUT
)
FREQ
UP/DOWN
)
AF OUTPUT
®GND
microphone
ground)
©GND
(PTT
ground)
)PTT
(4)
SQUELCH
SWITCH
PIN
NO.
FUNCTION
DESCRIPTION
2
+8
V DC
output
Max. 10
mA
3
Frequency up
Ground
Frequency
down
Ground
through
470
£2
4
Squelch
open
"LOW"
level
Squelch
closed
"HIGH"
level
CAUTION:
DO NOT
short
pin
2
to
ground
as
this
can
damage
the
internal
8
V
regulator.
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