Page 55
FT-991 O
peraTing
M
anual
e
nhanCing
T
ransMiT
s
ignal
Q
ualiTY
A
djuSting
the
SSb t
rAnSMitted
b
Andwidth
(
SSb M
ode
)
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 for SSB transmission. The bandwidth may be
varied by the operator, to provide different levels of fidelity or talk power, according to your preferences.
Here are the steps to adjust the SSB transmit bandwidth:
1. Press the
MENU(SETUP)
button to engage the
Menu.
2. Rotate the
MULTI
knob to select Menu item “
110
SSB TX BPF
”.
3. Touch [
SELECT
] on the LCD, then rotate the
MULTI
knob to select the desired bandwidth. The
available selections are: 100-3000 Hz, 100-2900
Hz, 200-2800 Hz, 300-2700 Hz, and 400-2600 Hz.
The default is 300-2700 Hz. A wider bandwidth will
provide greater fidelity. A narrow bandwidth will
compress the available transmitter power into less
spectrum, resulting in more “talk power” for DX
pile-ups.
4. Touch [
ENTER
] on the LCD to save the new set-
ting.
5. Press the
MENU(SETUP)
button or touch [
BACK
]
on the LCD to exit to normal operation.
A
dvice
:
The Transmit Monitor function is a very helpful way to
confirm the effect that changing the bandwidth will have
on fidelity. With
[
MONI
] displayed by pressing the
F(M-
LIST)
button
, you will be able to hear the difference in
sound quality as you make changes.
q
uick
p
ointS
:
The higher fidelity associated with wide bandwidth will
be particularly enjoyable on the low bands during local
rag-chew QSOs.
MULTI Knob
MENU(SETUP) Button
F(M-LIST) Button
Summary of Contents for FT-991
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