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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