Tuning; Ssb Reception - Yaesu FT-747GX Operating Manual

switching
from
CW,
SSB
or AM to
FM (5
kHz
steps). 25
Hz
fine
steps
are
still
available
in
all
modes
with the ClARif,rer,
described
later.
Turn the
AF
gain control clockwise
for
com-
fortable receiver
volume.
Tuning
Press
the FAST
button
on the front
panel
(or
microphone)
to
select course tuning
steps
(rrFASTil is
displayed). Press
it
again
to
return
to fine
tuning. Notice
that
coarse and
fine
tuning steps
are
mode-dependent,
as
shown
on page
5. In
CW and SSB
modes
the
fine
steps
are 25 Hz, so only every
fourth
step
will
change
the
displayed frequency.
The FAST button on the
microphone greatly
facilitates
vfo
tuning
with the
tuning
knob:
operate
the
tuning knob
with
one hand
while
operating
the FAST
button
on the mic
with
your other
hand. This allows quick
searching
for activiry (with
rhe
FAS
T
funcrion
on),
and then easy fine
tuning when rhe
FAST
function
is
turned
of
f. Of
course
you
can
also tune up
or
down using
the
UP
or
DWN
keys on the
microphone.
NOTE: The tuning knob and
microphone
keys
are
deactivated when rhe
D
LOCK (dial
lock)
function
is
active.
When
the dial
is
locked,
TLOCKT
appears
on the
display. Press the
D
LOCK button
to
toggle the lock on and off.
SSB
Reception
The ATT
and
NB
switches and rhe SQL
con-
trol
are
provided
to
reduce
or
eliminate
the
various types
of
noise and interference
that
can obstruct
comfortable reception.
Oper-
ation
is first
described
for
SS
B
(USB
or
LS
B)
reception
on an
amateur band,
with
variations
for
other
modes described later.
Press
the
MODE button
to
select USB
and
tune
to the
14,
2l or
28 MHz
phone
band
(or,
if
your
antenna
is
for a
band below l0
MHz, select that band and the LSB
mode).
Attenuator
On
a
clear frequency, check
for
any
S-meter
reading on the
background
noise
level
(hiss
or
crackle).
If
the
S-meter deflects above
3,.
turn on the attenuator (press ATT:
its
indi-
cator
will
glow green). This improves receiver
performance
in
the
presence
of
strong
signals
or
high noise
levels.
The
attenuator
may often be
needed
on
fre-
quencies below
l0
MHz, particularly
if
you
are
using
a
large
antenna
or
your station
is
in
a
noisy environment (city).
Noise
Blanker
Pulse-type noise,
either short
duration
types
such
as from ignition
systems
and
electric
motors and switches,
or
long duration
over-
the-horizon
radar
(ttwoodpeckertt)
signals,
can
be
reduced
or
removed
by
pressing
the
NB
button. However, when noise blanking
is
not
required
the NB
button
should
be
off
(out),
to
minimize distortion introduced
by
the
blanking
process.
Squelch
(All
Mode)
When
waiting
for a
scheduled
call
on
a
fairly
uncrowded band
the
squelch can be
activated
to
silence
the
receiver
until the call.
Just
tune
to
the
scheduled frequency and
turn
the
SQL control
clockwise
until the
receiver
is
quiet. Two other things
happen when
the
squelch
is
closed:
the
S-meter reading
drops
to
zero
(if it
wasnrt already), and
rrBUSYrl
disappears
from the
display.