Bedienungsanleitung Yaesu FT-897 (Seite 30 von 72) (Englisch)

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Page 28 FT-897 OPERATING MANUAL

TRANSMITTER OPERATION

Basic Setup/Operation

1. Press the MODE

(



)

or MODE

(



)

key so as to select

either SSB (LSB/USB) or the AM mode. In the SSB

mode, if you are operating on the 7 MHz or lower bands,

select the LSB mode. If you are operating on the 14 MHz

or higher bands, select the USB mode.

2. Press the

[

]

key momentarily,

then rotate the MEM/VFO CH

knob, as needed, until Multi

Function Row “i”

[

MTR, PWR,

DISP

]

appears on the display.

3. Now press the

[

](MTR)

[

]

key to select the “ALC”

meter function (“ALC” will appear above the

[

]

key).

You may need to press the

[

]

[

]

key multiple times,

as you will be toggling through several selections.

4. Press the microphone’s PTT switch, and speak into the

microphone in a normal voice level while watching the

meter. The ideal audio input level to the transmitter from

the microphone will cause a few “segments” of indica-

tion on the ALC meter. Release the PTT switch to return

to receive mode.

5. If the ALC meter is too high, or too low, you may need

to reset the Microphone Gain:

• Press and hold in the

[

]

key for one second to enter

the Menu mode.

• Rotate the MEM/VFO CH knob to recall Menu Mode

No-081

[

SSB MIC GAIN

]

(on SSB) or No-005

[

MIC GAIN

]

(on AM).

• Close the PTT switch, and while speaking into the

microphone rotate the DIAL until the proper ALC

indication is achieved on voice peaks.

• When done, press and hold in the

[

]

key for one

second to save the new setting for the Microphone

Gain.

1) The AM carrier level is preset to 25 Watts

during alignment at the factory, and should not

require further adjustment. It is important to

remember that AM transmission requires that power must

be distributed among the carrier and voice sidebands;

therefore, if excessive carrier power is used, there will be

insufficient power available for the information-carrying

voice sidebands.

2) The [TONE] switch on the back of the MH-31

A8J

micro-

phone provides adjustment of the microphone’s frequency

response. Setting this switch to the “2” position will roll

off some of the bass response, resulting in improved “talk

power” in many instances. The “1” position is primarily

used in countries like Japan, where vowel sounds are of

critical importance in conveying information; in Western

languages, consonant sounds (which are rich in high-fre-

quency components) are frequently more important.

SSB/AM TRANSMISSION

VOX Operation

The VOX system provides automatic transmit/receive

switching based on voice input to the microphone. With the

VOX system enabled, you do not need to press the PTT

switch in order to transmit.

1. Press the

[

]

key momentarily,

then rotate the MEM/VFO CH

knob, as needed, until Multi

Function Row “d”

[

RPT, REV,

VOX

]

appears on the display.

2. Press the

[

](

VOX

)

key to activate the VOX circuitry.

“Parentheses” will appear on the both sides of the “VOX”

indication, and the “ ” icon will appear on the display.

3. Without pressing the PTT switch, speak into the micro-

phone in a normal voice level. When you start speaking,

the transmitter should be activated automatically. When

you finish speaking, the transceiver should return to the

receive mode (after a short delay).

4. To cancel VOX and return to PTT operation, again press

the

[

](

VOX

)

key. The parentheses and “ ” icon will

disappear, signifying that the VOX system has been

turned off.

5. The VOX Gain may be adjusted, so as to prevent acci-

dental transmitter activation in a noisy environment. To

adjust the VOX Gain:

• While still in Multi Function Row “d”

[

RPT, REV,

VOX

]

, press and hold in the

[

](

VOX

)

key for one

second. This is a “hot key” feature which will in-

stantly recall Menu Mode No-088

[

VOX GAIN

]

• While speaking into the microphone, rotate the DIAL

to the point where the transmitter is quickly activated

by your voice, without causing background noise to

activate the transmitter.

• When you have selected the optimum setting, press

and hold the

[

]

key for one second to save the new

settings and return to normal operation.

6. The “Hang-Time” of the VOX system (the transmit-re-

ceive delay after the cessation of speech) may also be

adjusted via the Menu. The default delay is one second.

To set a different delay time:

• Press and hold in the

[

]

key for one second to acti-

vate the Menu mode.

• Rotate the MEM/VFO CH knob to select Menu Mode

No-087

[

VOX DELAY

]

• Rotate the DIAL while saying a brief syllable like

“Ah” and listening to the hang time, so as to set the

desired delay.

• hen your adjustments are complete, press and hold

in the

[

]

key for one second to save the new setting

and return to normal operation.

The delay time for return to the receive mode is

set independently on CW and voice modes; for

CW, use Menu Mode No-024 [CW DELAY] (see

next chapter).

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