Yaesu FT-2000D, Руководство по эксплуатации

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Page 78 FT-2000D O
PERATING
M
ANUAL
VOX
(
A
UTOMATIC
TX/RX S
WITCHING USING
V
OICE
C
ONTROL
: SSB/AM/FM M
ODES
)
Instead of using the microphone’s PTT switch or the front panel [ MOX
] switch to activate the transmitter, the VOX (Voice
Operated TX/RX Control) system provides hands-free, automatic activation of the transmitter, based on voice input into
the microphone. Setup of the VOX system takes only a few seconds.
1. To start, set the [ VOX
] and [
DELAY
] knobs fully
counter-clockwise (to the left).
2. Press the [ VOX
] button to engage VOX operation.
3. Speak into the microphone in a normal voice level,
and rotate the [ VOX
] knob clockwise (to the right) until
the point where your voice input activates the trans-
mitter.
A
DVICE
:
Do not advance the setting of the [
VOX
] knob too
much, because to do so will make the transmitter re-
spond to minor background noises in your station.
4. Now stop speaking, and note the amount of time it takes
for the receiver to recover. If the hang time is too long
or too short; rotate the [
DELAY
] knob, while speaking
briefly into the microphone and then pausing, so as to
set the desired hang time. Clockwise rotation of the
[
DELAY
] control will increase the hang time.
A A
A A A
D D D D DVICE VICE VICE VICE VICE
The Sub band (VFO-B) frequency display will show
the hang time of the VOX circuit for 3 seconds when-
ever the outer [
DELAY
] knob is turned.
You may disable this feature (displaying the hang time
of the VOX circuit) via Menu item “
015 diSP LVL
IND .” See page 117 for details.
MONITOR
(
SSB/AM/FM M
ODES
)
You may listen to the quality of your transmitted signal using the Monitor feature.
1. Press the [
MONI
] button. The “
” icon will ap-
pear in the display, indicating that the Monitor is turned
on.
2. During transmission, rotate the [
MONI
] knob to ad-
just the audio level from the Monitor. Clockwise rota-
tion of this knob will increase the volume level.
3. To switch the Monitor off again, press the [
MONI
]
button once more. The “ ” icon will turn off, con-
firming that the Monitor is now disengaged.
T
RANSMITTER
C
ONVENIENCE
F
EATURES
[VOX] Knob
[DELAY] Knob
[VOX] Button
5. To exit from VOX operation, press the [
VOX
] button
once more. We recommend doing this if you are going
to leave your station, to prevent inadvertent activation
of the VOX system by a ringing nearby telephone,
speaker audio from a TV, etc.
A
DVICE
:
ˆ The Anti-Trip setting sets the negative feedback of re-
ceiver audio to the microphone, to prevent receiver
audio from activating the transmitter (via the micro-
phone) can be adjusts via Menu item “
042 GEnE
ANTIVOX .”
ˆ VOX operation may be engaged on either Voice modes
(SSB/AM/FM) and on AFSK-based Data modes. Use
Menu item “
148 tGEn VOX SEL ” (the selections are
“
niC niC
niC niC
niC
(MIC)” and “
dAtA dAtA
dAtA dAtA
dAtA
(DATA)”).
[MONI] Knob
[MONI] Button
A
DVICE
:
ˆ If you are using the speaker for monitoring, instead of headphones, excessive advancement of the [ MONI
] knob can
cause feedback to occur. Additionally, this feedback can cause the VOX system to hang up in a loop, making it impos-
sible to return to receive. Therefore, we recommend the use of headphones, if at all possible, or the minimum usable
setting of the [
MONI
] knob, if the speaker must be used.
ˆ Because the Monitor feature utilizes a sampling of the transmitter’s IF signal, it can be very useful for checking the
adjustment of the Speech Processor or Parametric Equalizer on SSB, and for checking the general signal quality on AM
and FM.