Bedienungsanleitung Icom IC-7200 (Seite 72 von 104) (Englisch)

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ANTENNA TUNER OPERATION

■ Optional AT-180 automatic antenna tuner operation

The AT-180 automatic antenna tuner matches the

IC-7200 to the connected antenna automatically.

Once the tuner matches an antenna, the variable

capacitor settings are memorized as a preset point

for each frequency range (100 kHz steps). Therefore,

when you change the frequency range, the variable

capacitors are automatically preset to the memorized

point.

NOTE:

• The AT-180 can match both HF and 50 MHz

bands. However, operation is different for the HF

and 50 MHz bands.

• When connecting the AT-180, the IC-7200’s out-

put power must be more than 10 W. Otherwise,

the AT-180 may not be tuned correctly. (AT-180’s

minimum operating input power is 8 W.)

CAUTION: NEVER transmit with the tuner ON

when no antenna is connected. This will damage

both the transceiver and antenna tuner.

MODE

TUNER

FILTER

SPCH

V/M

A/B

SPLIT

M-CL

SCAN

SET

ATT

AMP

COMP

VOX

MNF

RIT

5 6

1814

3.5

1.8

F-INP

M-CH/RIT

ENT

BAND

GENE

AGC

ANF

METER

TUNER

D Tuner operation

• For the HF band:

Push

TUNER

to turn the tuner ON. The antenna is

tuned automatically during transmission when the

antenna SWR is higher than 1.5:1.

• When the tuner is ON, “ ” indication appears.

• For the 50 MHz band:

Push and hold

TUNER

for 1 sec. to tune the antenna.

If “ ” indicator blinks slowly while transmitting,

push and hold

TUNER

for 1 sec. again to re-tune the

antenna.

D Manual tuning

During SSB operation on HF bands at low voice lev-

els, the AT-180 may not be tuned correctly. In such

cases, manual tuning is helpful.

Push and hold

TUNER

for 1 sec. to start manual tun-

ing.

• When CW mode is selected, a side tone is emitted, and

“

” indicator blinks; then, the previous mode is se-

lected.

If the tuner cannot reduce the SWR to less than

1.5:1 after 20 sec. of tuning, “ ” indicator disap-

pears. In this case, check the following:

• the antenna connection and feedline

• the antenna SWR (p. 30; meter function, p. 60;

Measuring SWR)

Through inhibit (HF bands only)

The AT-180 has a through inhibit condition. When

selecting this condition, the tuner can be used at

poor SWR’s. In this case, automatic tuning in the

HF bands activates only when exceeding SWR 3:1.

Therefore, manual tuning is necessary each time you

change the frequency. Although termed “through in-

hibit,” the tuner will be set to the “through” conﬁgura-

tion if the SWR is higher than 3:1 after tuning.

CONVENIENT

• Tuner sensitive condition (HF bands only)

If you require critical tuning at any time during trans-

mission, select the tuner sensitive condition.

See p. 68 for selection.

• Automatic tuner start (HF bands only)

If you want to turn OFF the tuner under conditions

of VSWR 1.5:1 or less, use “automatic tuner on” and

turn the tuner OFF. See p. 76 for the automatic tuner

function.

• PTT tune function (p. 76)

The AT-180 is tuned when [PTT] is pushed after the

frequency is changed (more than 1%) if the AT-180 is

turned ON. This function removes the “push and hold

TUNER

” operation and activates first transmission

on the new frequency.

This function is turned ON in the set mode.

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