Bedienungsanleitung Yaesu ft-897D (Seite 43 von 76) (Englisch)

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Page 41FT-897D OPERATING MANUAL

ACTIVE-TUNING ANTENNA SYSTEM

(

ATAS-100/-120

)

OPERATION

Manual Tuning

In some instances, the SWR may be slightly improved by

manual adjustment of the antenna position. This may be

needed for operation on bands like 40 meters, where the

“Q” of the ATAS-100/-120 is high, causing a narrow reso-

nance range.

Before Manual Tuning, press the

[

]

key, as needed, to re-

call Multi Function Row “i”

[

MTR, -----, DISP

]

, then press

the

[

](

MTR

)

[

]

key to change the meter function to the

SWR meter (“SWR” icon will appear at the upper of the

[

]

key).

To tune the ATAS-100/-120 manually, recall Multi Func-

tion Row “k” [TUNE, DOWN, UP], then press and hold in

the microphone PTT switch. With the transceiver in the

“transmit” mode, press and hold in the

[

](

)

key (to raise

the antenna) or the

[

](

DOWN

)

key (to lower the antenna).

While you hold in one of these keys, the FT-897D will gen-

erate a carrier, and you may watch the top scale of the FT-

897D’s meter, looking for the meter indication to reach its

minimum value. When this is reached, release the

[

](

)

[

](

DOWN

)

key, then release the PTT key to return to

the “receive” mode.

1) Once automatic matching has been success-

fully accomplished, you must change frequency

by at least 10 kHz before attempting automatic

matching again. Within a window of ±10 kHz from a

match point, the transceiver’s microprocessor will ig-

nore any command to attempt automatic matching.

2) Antenna tuning is accomplished using a “CW” car-

rier, although the mode indication will not change to

“CW” (if you are operating on another mode) during

antenna tuning.

3) If you see a “HI SWR” on the LCD, it may mean that

there is a problem in your coaxial cable (bad connec-

tion, etc.) which is preventing successful tuning. Re-

place the cable, or try adding a few feet/meters of cable

(to eliminate the possibility of adverse “transformer ac-

tion” in the 50Ω cable during the tuning process).

4) If you are able to achieve an SWR of less than 2:1 via

manual tuning, the FT-897D will “accept” the manual

setting, and you may then re-tune automatically when

changing bands. If, however, you stop manual tuning

at a non-optimum setting (SWR >2:1), the FT-897D will

not permit further automatic tuning. To refresh the set-

ting of the ATAS-100/-120, press the [B](DOWN) key

until the ATAS-100/-120 fully retracts. You may then

restart automatic tuning per the procedures described

earlier.

5) The FT-897D may also be used with the model ATAS-

100 antenna, although the tuning speed of the ATAS-

100 will be slower than with the ATAS-120.

TRANSMITTER OPERATION

The optional ATAS-100/-120 Active-Tuning Antenna Sys-

tem provides operation on a number of HF bands (7/14/21/

28 MHz) plus 50 MHz, 144 MHz, and 430 MHz. The FT-

897D provides microprocessor control of the tuning mecha-

nism in the ATAS-100/-120 for convenient automatic tuning.

Before operation can begin, you must instruct the FT-897D’s

microprocessor that the ATAS-100/-120 is being used. This

is done using the Menu Mode:

1. Press and hold in the

[

]

key for one second to activate

the Menu mode.

2. Rotate the MEM/VFO CH knob to recall Menu Mode

N0-085

[

TUNER/ATAS

]

. The default setting for this

Menu is “OFF.” Rotate the DIAL to change the setting to

“ATAS(ALL),” if you are using the ATAS-100/-120 for

all bands (you must connect an external diplexer to com-

bine the two antenna ports so as to use the ATAS-100/-

120 on all bands). Or make the setting “ATAS(HF&50),”

if you are using the ATAS-100/-120 on 7 ~ 50 MHz,

with a dual-band VHF/UHF antenna connected sepa-

rately to the 144/430 MHz antenna port. If you are just

using the ATAS-100/-120 on the HF bands only, with a

dual-band VHF/UHF antenna connected separately to

the 144/430 MHz antenna port (no 50 MHz operation)

make the setting “ATAS(HF).”

3. Press and hold in the

[

]

key for one second to save the

new setting and exit to normal operation.

Automatic Tuning

1. Press the

[

]

key, as needed, to recall Multi Function

Row “k”

[

TUNE, DOWN, UP

]

2. Press the

[

](

TUNE

)

key to turn the ATAS-100/-120 on

(this action only supplies voltage to the antenna at this

point; re-tuning does not begin). “Parentheses” will ap-

pear on the both sides of the “TUNE” indication, and the

“ATAS” will appear on the LCD.

3. Now press and hold in the

[

](

TUNE

)

key for one sec-

ond to initiate ATAS-100/-120 tuning. The transmitter

will automatically be activated, a carrier will be sent,

and the antenna’s length will be adjusted for best SWR.

4. If the microprocessor determines that the antenna’s length

is radically incorrect from the optimum value, no carrier

will be sent out. Instead, in the receive mode, the an-

tenna will retract to its shortest position (this may take

up to one minute). While this is happening, do not press

the

[

](

TUNE

)

key again.

When the ATAS-100/-120 reaches its minimum length,

automatic tuning will be initiated, and the transmitter will

automatically shut off when a satisfactory SWR is

achieved.

5. On the 144 MHz and 430 MHz bands, the ATAS-100/-

120 does not require a tuning process. SWR will be sat-

isfactory when the antenna is fully retracted.

6. When you wish to conclude ATAS-100/-120 operation,

press the

[

](TUNE)

key; the “Parentheses” disappear

surrounding the “ATAS” indication.

Yaesu ft-897D Seite 43

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