Internal Switch Description - Icom IC-7200 Instruction Manual

■ AT-180 internal switch description
The optional AT-180 has 3 operating configurations
for HF band operation. Select a suitable configura-
tions according to your antenna system.
q Remove the top cover of the AT-180.
w Set the tuner switches to the desired positions ac-
cording to the table below.
SW Position
A The tuner operating condition is set by
(default) S2 described below.
B THROUGH INHIBIT
The tuner tunes the antenna even when
the antenna has poor SWR
3:1 after tuning)
ing is necessary each time you change
the frequency although the tuner auto-
matically 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.
C TUNER SENSITIVE CONDITION
The tuner tunes each time you transmit
(except SSB mode)
SWR is obtained at any given time.
For SSB mode, the same condition as
the "D" position.
D NORMAL
(default) The tuner tunes when the SWR is higher
than 1.5:1. Therefore, the tuner activates
only when tuning
• Specifications for the AT-180
• Frequency coverage
• Input impedance
• Maximum input power
• Minimum tuning power
• Matching impedance range : 16.7–150 Ω (HF band)
• Tuning accuracy
• Insertion loss
• Power supply requirements : 13.8 V DC/1 A (supplied
• Dimensions (mm/in)
• Weight (approx.)
• Supplied accessories
Operation
(up to VSWR
. In this case, manual tun-
. Therefore, the lowest
is necessary.
: 1.8–54 MHz
: 50 Ω
: 120 W
: 8 W
20–125 Ω (50 MHz band)
: Less than SWR 1.5:1
: Less than 1.0 dB
(after tuning)
from the transceiver's
ACC socket)
: 167(W) × 58.6(H) × 225(D)
(W) × 2 (H) × 8
9 5 7
6 ⁄ ⁄ ⁄ (D)
16 17 8
: 2.3 kg; 5 lb 1 1 ⁄ oz
8
: Coaxial cable (1 m),
ACC cable (DIN 13 pins)
ANTENNA TUNER OPERATION
• AT-180 inside top cover
S2 S1
D C B A
• Connector information for ACC(2) socket
7 6
3
4
5
2
PIN NO./
DESCRIPTION
NAME
q NC (* If the modification is performed (p. 97),
(8 V*) regulated 8 V output.) (10 mA max.)
w GND Connects to ground.
Input/output pin.
Goes to ground when transmitting
e SEND
(20 mA max).
When grounded, transmits.
r NC (* If the modification is performed (p. 97),
(BAND*) band voltage output.)
t ALC ALC output voltage (–4 to 0 V).
y NC No connection.
u 13.8 V 13.8 V output when power is ON (1 A max).
1
ACC 2
9
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
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