Icom IC-7200

9-3
9
ANTENNA TUNER OPERATION
■ Setting the AT-180 internal switches
The optional AT-180 has 3 operating configurations
for HF band operation. Select a suitable configura-
tions for 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 Operation
S1
A
(default)
The tuner operating mode is set by S2
described below.
B THROUGH INHIBIT
The tuner tunes the antenna even when
the antenna has poor SWR (up to VSWR
3:1 after tuning). In this case, manual tun-
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.
S2
C TUNER SENSITIVE SETTING
The tuner tunes each time you transmit
(except SSB mode). Therefore, the low-
est SWR is obtained at any given time.
For SSB mode, the same SETTING as
the “D” position.
D
(default)
NORMAL
The tuner tunes when the SWR is higher
than 1.5:1. Therefore, the tuner activates
only when tuning is necessary.
• Specications for the AT-180
Frequency coverage : 1.8–54 MHz
Input impedance : 50 Ω
Maximum input power : 120 W
Minimum tuning power : 8 W
Matching impedance range : 16.7–150 Ω (HF band)
20–125 Ω (50 MHz band)
Tuning accuracy : Less than SWR 1.5:1
Insertion loss : Less than 1.0 dB
(after tuning)
Power supply requirements : 13.8 V DC/1 A (supplied
from the transceiver’s
ACC socket)
Dimensions (mm/in) :
167(W) × 58.6(H) × 225(D)
6.6(W) × 2.3(H) × 8.9(D)
Weight (approx.) : 2.3 kg; 5.1 lb
Supplied accessories : Coaxial cable (1 m),
ACC cable (DIN 13 pins)
• AT-180 inside top cover
S2 S1
DC BA
• Connector information for the ACC(2) socket
ACC 2
1
2
3
4
5
6
7
PIN NO./
NAME
DESCRIPTION
q NC
(8 V*)
(* If the Band Voltage modification is per-
formed, regulated 8 V output. (p. 12-2)) (10
mA max.)
w GND
Connects to ground.
e SEND
Input/output pin.
Goes to ground when transmitting
(20 mA max).
When grounded, transmits.
r NC
(BAND*)
(* If the Band Voltage modification is per-
formed, band voltage output. (p. 12-2))
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).
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