OPTIONAL INSTALLATIONS/SETTINGS 10

AT-180 internal switch description

The optional AT-180 has 3 operating conditions for HF band operation. Select a suitable condition according to your antenna system.

Remove the top cover of the AT-180.

Set the tuner switches to the desired positions according to the table below.

SW

Position

Operation

AThe tuner operating condition is set by S2 (default) described below.

 

THROUGH INHIBIT

 

The tuner tunes the antenna even when

 

the antenna has poor SWR (up to VSWR

S1

3:1 after tuning). In this 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 CONDITION

 

The tuner tunes each time you transmit

C

(except SSB mode). Therefore, the lowest

SWR is obtained at any given time.

 

S2

For SSB mode, the same condition as the

“D” position.

NORMAL CONDITION

DThe tuner tunes when the SWR is higher (default) than 1.5:1. Therefore, the tuner activates

only when tuning is necessary.

AT-180 inside top cover

S2 S1

D C B A

Specifications for the AT-180

Frequency coverage : 1.9 – 54 MHz

• Input impedance

: 50

• Maximum input

: 120 W

power

 

• Minimum tuning

: 8 W

power

 

Matching impedance : 16.7–150 (HF band)

range

20 –125(50 MHz band)

• 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 (supplied from

requirements

the transceiver’s ACC socket)

Dimensions (mm/in) : 167(W) 58.6(H) 225(D) 6916(W) 2517(H) 878(D)

• Weight

: 2.4 kg; 5 lb 4 oz

Supplied accessories : coaxial cable (1 m), ACC cable (DIN 13 pins)

Connector information for ACC(2) socket

4

2

5

1

3 ACC 2

6

7

PIN NO./

DESCRIPTION

NAME

 

8 V

Regulated 8 V output.

(10 mA max.)

 

 

 

GND

Connects to ground.

 

 

SEND

Input/output pin.

Goes to ground when transmitting (20 mA

 

max). When grounded, transmits.

 

 

BAND

Band voltage output.

(Varies with amateur band; 0 to 8.0 V).

 

 

 

ALC

ALC output voltage (–4 to 0 V).

 

 

NC

No connection.

 

 

13.8V

13.8 V output when power is ON (1 A max).

 

 

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Icom I706MKTMG, IC-706MKIIG instruction manual AT-180 internal switch description, S2 S1 B a, PIN no Description Name

I706MKTMG, IC-706MKIIG specifications

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