Ssb Transmission; Basic Operation; Vox Operation; Digital Speech Processor Operation - Yaesu FT-920 Operating Manual

SSB Transmission

Basic Operation

Connect your microphone to the front panel M
jack.
Preset the front panel controls as follows:
M ; LSB or USB (depending on band;
ODE
use USB on 14 MHz & higher bands)
M S ; ALC
ETER ELECT
M G ; 9 o'clock position
IC AIN
RF P ; Fully clockwise
WR
Press the microphone's PTT switch, and speak
into the microphone at a normal voice level. The
T indicator in the display will be illuminated,
RANSMIT
and the ALC meter will deflect according to the
peaks in your speech. Adjust the M
so that the ALC meter peak reading is along (but
not beyond) the right edge of the ALC range on
the meter.
Release the PTT switch to return to the receive
mode.
For operation at lower power levels, rotate the RF
P control counterclockwise while watching the
WR
PO scale on the meter so as to set the desired
power level.
Counterclockwise rotation of the RF P
or operation using an antenna with an impedance
greatly different from 50 , may result in a higher
reading on the ALC meter. Therefore, it is helpful
to make initial adjustment of the M
into a 50 dummy load or carefully-matched an-
tenna, and with the RF P
wise.

VOX Operation

When operating in the SSB, AM, or FM modes, you
may use the VOX system to provide hands-free au-
tomatic change-over from receive to transmit. When
the speech input from the microphone is detected by
the VOX circuitry, an internal "PTT" switch will be
activated to begin transmission; when speech input
ceases, the VOX circuitry will release the transceiver
back to the receive mode. Operation is quite simple:
Press the VOX switch.
Without pressing the PTT switch on the micro-
FT-920 Operating Manual
IC
G control
IC AIN
control,
WR
G control
IC AIN
control fully clock-
WR
phone , speak into the microphone at a normal
voice level. The FT-920 should automatically
switch into the transmit mode, and should return
to receive when you quit talking.
To cancel VOX and return to PTT operation, press
the VOX switch once more.
The VOX system may require minor adjustment to
optimize its parameters for your particular voice char-
acteristics. These parameters are set via the Menu
system as follows:
If speaking in your normal voice level does not
activate the transmitter, or if background noise
in the operating room trips the VOX, the VOX
sensitivity (V G ) may be adjusted via Menu
OX AIN
Item U-65, as described on page 81.
If the delay in returning to the receive mode is
not suitable for your operating habits (too quick
or too slow), the delay interval (V
be adjusted via Menu Item U-64, as described
on page 81.
To prevent the speaker audio from activating
the VOX circuitry, you may need to adjust the
VOX Antitrip setting. Use Menu Item U-66,
described on page 82, to do this.

Digital Speech Processor Operation

The Digital Speech Processor provides two chief
methods of enhancing your SSB "talk power:"
Using digital audio compression methods, the
Digital Speech Processor increases your
transceiver 's average power output ; and
Using specially-designed digital equalization
techniques, you may choose a DSP voice pat-
tern contour which most closely matches your
voice's characteristics, so as to focus more of
the available transmitter power into transmis-
sion of the most useful frequency components
of your speech. Four different voice pattern
contours are available.
Once you have correctly set the M
level, you may set up the Digital Speech Processor
as follows:
Press the M S
ETER ELECT
mitter selection is set to C
Press the P switch once so that the P
ROC
cator on the display becomes illuminated.
Press the PTT switch, and speak into the micro-
phone in a normal voice level. You will observe
D ) may
OX ELAY
G control's
IC AIN
switch so that the trans-
.
OMP
indi-
ROC
49