At-180 Instruction Service

7/31/2019 At-180 Instruction Service

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I c om

2 3 8B e ll e

AT-180

Au tom a t i c An tenna Tune r

Op e r a t i n g I n s t r u c t i o n s

an d

Serv i ce I n f o rm a t i on

Compiled from the IC-706 Operating Instructions and Service M


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4 RECEIVE AND TRANSMIT

The AT-180 automatic antenna tuner matches the IC-706MKIIG to the connected antenna automatically.Once the tuner matches an antenna, the variablecapacitor angles are memorized as a preset point foreach frequency range (100 kHz steps). Therefore,when you change the frequency range, the variablecapacitors are automatically preset to the memorized

point.

Note:

The AT-180 cannot be used for the 144/430 MHzband.

MANUAL TUNING

During SSB operation on Hels, the AT-180 may not bcases, manual tuning is he

Push and hold [TUNER] foing.CW mode is selected, a s

[TUNER] light flashes; then,

ed.

DOptional AT-180 AUTOMATIC ANTENNA TUNER operation

CAUTION: NEVER transmit with the tuner ONwhen no antenna is connected. This will damageboth the transceiver and the antenna tuner.

[TUNER/CALL]


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I AT-180 internal switch descriptionThe optional AT-180 has 3 operating conditions forHF band operation. Select a suitable conditionaccording 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.

AT-180 inside top cover

S2 S1

D C B A

SW

Po

sition

Operation

S1

A(default)

The tuner operating condition is set by S2described below.

B

THROUGH INHIBITThe tuner tunes the antenna even whenthe antenna has poor SWR (up to VSWR3:1 after tuning). In this case, manual tun-ing is necessary each time you change thefrequency although the tuner automatical-l starts t ning hen the VSWR is higher

OPTIONAL INSTALLAT


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At-180 Instruction Service

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