Icom IC-7200 Advanced Instructions page 96

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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
A The tuner operating mode is set by S2
(default)
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.
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 NORMAL
(default)
The tuner tunes when the SWR is higher
than 1.5:1. Therefore, the tuner activates
only when tuning is necessary.
• 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
: 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)
6.6(W) × 2.3(H) × 8.9(D)
: 2.3 kg; 5.1 lb
: Coaxial cable (1 m),
ACC cable (DIN 13 pins)
• AT-180 inside top cover
S2
D C
• Connector information for the ACC(2) socket
7
3
5
PIN NO./
NAME
(* If the Band Voltage modification is per-
q NC
formed, regulated 8 V output. (p. 12-2)) (10
(8 V*)
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 Band Voltage modification is per-
(BAND*) 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).
9-3
S1
B A
6
1
ACC 2
4
2
DESCRIPTION