Page 94 FTDX9000D OPERATION MANUAL
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 DELAY and VOX controls (# )
fully counter-clockwise (to the left).
2. Press the VOX switch (# ) to engage VOX opera-
tion.
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
transmitter.
H do not advance the setting of the VOX control too much,
because to do so will make the transmitter respond 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 paus-
ing, so as to set the desired hang time. Clockwise ro-
tation of the DELAY control will increase the hang
time.
5. To exit from VOX operation, press the VOX switch
once more. We recommend doing this if you are go-
ing to leave your station, to prevent inadvertent acti-
vation of the VOX system by a ringing nearby tele-
phone, speaker audio from a TV, etc.
CONVENIENT TRANSMITTER ACCESSORIES
USING THE MONITOR
You may listen to the quality of your transmitted signal using the Monitor feature.
1. Press the MONI switch (# ). The imbedded Red
LED will light up, indicating that the Monitor is turned
on.
2. During transmission, rotate the MONI knob (# )
to adjust the audio level from the Monitor. Clockwise
rotation of this knob will increase the volume level.
3. To switch the Monitor off again, press the MONI
switch once more. The Red LED will go out, confirm-
ing that the Monitor is now disengaged.
Advice
H If you are using the speaker for monitoring, instead of
headphones, excessive advancement of the MONI
control can cause feedback to occur. Additionally, this
feedback can cause the VOX system to hang up in a
loop, making it impossible to return to receive. There-
fore, we recommend the use of headphones, if at all
possible, or the minimum usable setting of the
MONI control, if the speaker must be used.
H Because the Monitor feature utilizes a sampling of the
transmitter’s IF signal, it can be very useful for check-
ing the adjustment of the Speech Processor or Para-
metric Equalizer on SSB, and for checking the gen-
eral signal quality on AM and FM.
Advice
VOX operation may be engaged on either Voice modes
(SSB/AM/FM) and on AFSK-based Data modes. Use
Menu item TX GNRL. 159 VOX SELECT (the selec-
tions are “MIC” and “DATA”).
DELAY knob / VOX knob
VOX switch
MONI knob / MONI switch
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