Page 87
FT
DX
9000D O
PERATION
M
ANUAL
SSB/AM M
ODE
T
RANSMISSION
(E
NHANCING
T
RANSMIT
S
IGNAL
Q
UALITY
)
A
DJUSTING
THE
SSB T
RANSMITTED
B
ANDWIDTH
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 070 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.
Advice
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 veri-
fying 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 quality as you make
changes.
Quick Point
The higher fidelity associated with wide bandwidth
will be particularly enjoyable on the low bands, dur-
ing 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 conjunction with judicious
adjustment of the Parametric Microphone Equalizer
(see next chapter) can provide truly outstanding fidel-
ity and very natural-sounding audio.
When using the wider bandwidth selections (especially
“3000WB”), the apparent power output from the trans-
mitter may seem lower. This is because the available
power from the transmitter is being distributed over a
wider bandwidth, and the power detection circuitry
does not compensate for the effect of the bandwidth
selection (it is calibrated in the default 2.4 kHz band-
width).
CLAR/VFO-B knob
MNU key
MAIN Tuning Dial
Summary of Contents for FTDX-9000D
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