Adjusting The Ssb Transmitted Bandwidth - Yaesu FTDX9000D - DATA MANAGEMENT Operation Manual

SSB/AM M
ODE
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DJUSTING THE
For transmission on SSB, a default bandwidth of 2.4 kHz is provided. This bandwidth provides reasonable fidelity along
with good talk power, and is typical of the bandwidth used for decades during SSB transmission. However, the bandwidth
may be varied by the operator, so as to provide different levels of fidelity or talk power, according to your preferences.
Here's how to adjust the transmitted bandwidth on SSB:
1. Press the [ MNU ] switch to engage the Menu.
2. Rotate the [ Main Tuning Dial ] knob so as to select
Menu Item "MODE SSB 078 SSB-TX-BPF."
3. Rotate the [ CLAR/VFO-B ] knob to select the desired
bandwidth. The available selections are
3000WB/50-3000/100-2900/200-2800/
300-2700/400-2600,
and the default is 300-2700 Hz.
4. Press and hold in the [ MNU ] switch for two seconds
to save the new setting and exit to normal operation.
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You may verify the effect of your adjustments
of the transmitted bandwidth by observing the
Audio Scope on the "Oscilloscope" page of the
TFT.
The Transmit Monitor is another helpful way
of verifying the effects on fidelity of changing
the bandwidth. Press the [ MONI ] switch, then
adjusting the [ MONI ] control for a comfortable
listening level while you are transmitting, you
will be able to hear the difference in sound qual-
ity as you make changes.
FT 9000D O
DX PERATION
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T
RANSMISSION
SSB T
[ Main Tuning Dial ] knob
M
ANUAL
T
NHANCING RANSMIT
B
RANSMITTED ANDWIDTH
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The higher fidelity associated with wide band-
width will be particularly enjoyable on the low
bands, during local rag-chew QSOs.
The "3000WB" setting is a special hi-fidelity
setting, whereby the transmitted bandwidth is
in excess of 3 kHz. This selection, in conjunc-
tion with judicious adjustment of the Paramet-
ric Microphone Equalizer (see next chapter) can
provide truly outstanding fidelity and very natu-
ral-sounding audio.
When using the wider bandwidth selections (es-
pecially "3000WB"), the apparent power out-
put from the transmitter may seem lower. This
is because the available power from the trans-
mitter is being distributed over a wider band-
width, and the power detection circuitry does
not compensate for the effect of the bandwidth
selection (it is calibrated in the default 2.4 kHz
bandwidth).
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IGNAL UALITY
[ CLAR/VFO-B ] knob [ MNU ] key
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