Internal Switch; Installation And Connections - Icom ic-718 Instruction Manual

 AT-180

INTERNAL SWITCH

The optional AT-180 has 3 operating settings.
Select the suitable setting for your antenna
system.
q Remove the top cover of the AT-180.
w Set the tuner switches to the desired positions
according to the table below.
SW Position
A The tuner operating settings are set by S2
(default)
described below.
THROUGH INHIBIT MODE
The tuner tunes the antenna even when
the antenna has poor SWR (up to VSWR
3:1 after tuning). In that case, manual tun-
ing is necessary each time you change the
B frequency, although the tuner automatically
starts tuning when the VSWR is higher
than 3:1. This setting is called "through
inhibit." However, the tuner is set to
"through" if the VSWR is higher than 3:1
after tuning.
TUNER SENSITIVE MODE
The tuner tunes each time you transmit
(except in the SSB mode). Therefore, the
C
lowest SWR is obtained at any given time.
In the SSB mode, the setting is the same
as the "D" position below.
NORMAL MODE
D The tuner tunes when the SWR is higher
(default)
than 1.5:1. Therefore, the tuner activates
only when tuning is necessary.
• Specifications for the AT-180
• Frequency coverage: 1.9 – 54 MHz
50 Ω
• Input impedance:
• Maximum input: 120 W
power
• Minimum tuning: 8 W
power
• Matching impedance: 16.7–150 Ω
20 –125 Ω
range
• Tuning accuracy: Less than SWR 1.5:1
• Insertion loss: Less than 1.0 dB
(after tuning)
• Power supply: 13.8 V DC/1 A
requirements
the transceiver's ACC socket)
167 (W) × 58.6 (H) ×225 (D) mm
• Dimensions
(mm/in):
6
• Weight (approx.): 2.3 kg, 5 lb 1
• Supplied accessories: coaxial cable
ACC cable
Operation
(HF band)
(50 MHz band)
(supplied from
(W) × 2 (H) × 8
9 5 7
⁄ ⁄ ⁄ (D) in
16 17 8
⁄ oz
1
8
,
(1 m)
(DIN 13 pins)

INSTALLATION AND CONNECTIONS

• AT-180 inside top cover
S2 S1
D C B A
• Connector information for ACC 2 socket
2
5
4
3 ACC 2
1
6 7
PIN NO./
DESCRIPTION
NAME
Regulated 8 V output.
q 8 V
(10 mA maximum)
w GND
Connects to ground.
Input/output pin.
e SEND
Goes to ground when transmitting (20 mA
maximum.) Transmits when grounded.
Band voltage output.
r BAND
(Varies with the selected band; 0 to 8.0 V.)
t ALC
ALC output voltage (–4 to 0 V.)
y NC
No connection.
u 13.8V
13.8 V output when power is ON (1 A maximum.)
9
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