Yaesu FT-736R Operating Manual page 25

encountered on the receiving frequency in
SSB or CW modes, press the NB switch to
activate the blanker. For best performance,
always turn the noise blanker off when it
is not needed. It is disabled during FM
operation.
4.6.3
RF Gain Control
The RF gain control (outer knob on the
same shaft as the AF control) allows
manual setting of the gain of the early
stages of the receiver on the 50, 144 and
220 MHz bands. In CW and SSB modes, the
gain of
these stages is also controlled
automatically by AGC (§4.6.6) so the RF
gain is usually kept fully clockwise for
maximum gain, unless strong signals cause
interference.
4.6.4 IF Passband Shift
In SSB and CW modes, the location of the
IF
passband relative
to the (displayed)
receiving frequency can be adjusted by the
SHIFT control (inner knob to the right of
the CHANNEL knob). Think of this control
as a sliding window adjustment, which al-
lows the receiving passband (window) to
be slid back and forth, providing different
views of the receiving frequency.
Normally, the SHIFT control is kept in the
12 o'clock position until a desired signal
has been tuned in. If the signal is being
interfered with by another signal on an
adjacent frequency, the SHIFT control can
be adjusted to the left or right to move
the passband window farther from the
interference. Notice also that the audio
tone characteristics of the receiver
change.
Note: Before adjusting the SHIFT control,
make sure the NOTCH filter is switched
off. Also, return the SHIFT control to the
12 o'clock position when retuning.
4.6.5 IF Notch Filter
The IF notch filter is used to suppress
carrier heterodyne interference in SSB and
CW reception. The notch is activated by
the switch of the same name to the left
of the tuning knob, and adjusted by the
inner knob of the middle control at the
bottom right. While activated, the indicator
next to the NOTCH switch glows green.
Activate the notch filter only after the
desired signal has been tuned in and the
SHIFT control has been adjusted for
minimum adjacent-channel interference (if
needed). Press the NOTCH switch and
adjust the control gradually back and forth
to find the point where the unwanted
heterodyne suddenly drops. If the hetero-
dyne level is stronger than the desired
signal, the S-meter indication will dip
when the notch is properly set. Turn the
notch switch off before tuning to a new
frequency or adjusting the SHIFT control.
See also §4.14.3.
4.6.6 AGC (Automatic Gain Control)
In SSB and CW modes, you can select the
AGC decay rate that provides the most
comfortable reception (minimum fading or
pumping of receiver gain between syll-
ables), using the three-position AGC
selector (small knob, second from the
right, next to SAT). Usually, for SSB, this
will be the 'S' (Slow) position, but when
signals are fluttering, or when looking for
a weak signal you may find 'M' (Medium)
or 'F' (Fast) better, at least until you
make contact. For CW, the Medium or Fast
positions will be helpful at higher speeds
or under noisy conditions with weak
signals.