Icom i7200, Инструкция по эксплуатации, Страница: 73 / 104

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ANTENNA TUNER OPERATION
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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 Operation
S1
A
(default)
The tuner operating condition 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 CONDITION
The tuner tunes each time you transmit
(except SSB mode)
. Therefore, the lowest
SWR is obtained at any given time.
For SSB mode, the same condition 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.
•
Specifications 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
9
⁄
16
(W)
×
2
5
⁄
17
(H)
×
8
7
⁄
8
(D)
• Weight (approx.) : 2.3 kg; 5 lb 1 1 ⁄
8
oz
• Supplied accessories : Coaxial cable (1 m),
ACC cable (DIN 13 pins)
•
AT-180 inside top cover
S2 S1
D C B A
•
Connector information for ACC(2) socket
ACC 2
1
2
3
4
5
6 7
PIN NO./
NAME
DESCRIPTION
q
NC
(8 V*)
(* If the modification is performed (p. 97),
regulated 8 V output.) (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 modification is performed (p. 97),
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).