If Passband Shift; If Notch Filter; Agc (Auromatic Gain Conrrol) - Yaesu FT-767GX Operating Manual

To use t he APf, fírst tune in che deslred C W
slgnal wlth the APf off,
and ad1ust the APf control for peak volume on
the desired signal. Turn the APf oíí before
tunlng to a new írequency.
'Tips for CW Operation'.
4.6.7
W Passband Siüft
l f
The localion or tbe
che carrler frequency of the recelver in SSB,
CW, AM and fSK modes can be ad1us1ed by the
SHIFT control (inner knob on the contrai jusl
below and to the right or the lunlng knob).
Think of this conirol as a sliding window ad·
justment, whlch allows rhe recelvlng passband
lO
(wlndow) be slid back and forth, prov1dmg
different vlews of the receivl ng frequency.
Normally, lhe SHIFT conirol ls kep1 ln the 1 2
o'clock posltion unttl
been tuned in. Then,
interíered wlth by another slgnal just above
or below lhe desired one, the SHIFT control
can be ad1us1ed to rhe left or rlghl, respec­
lO
tively, move the passband window íarther
from the interference.
audlo tone characteristics
change: thls Is useíul i n AM receptlon,
plemencing the TONE conrrol.
Note: Before adjustíng the SHIFT control,
make sure lhe NOTCH fllter is switched
orr. Also, returo the SHlfT conrrol to
1 2 o'clock posiclon when
lhe
anolher frequency.
4.6.8
I F Notch Filter
The IF notch filter provides a means to sup
press carrler heterodyne lnteríerence l n SSB,
CW, AM and fSK reception.
vaced by the swirch of the sarne name
left or the tuning knob, and ad)us1ed by the
inner knob of the middle contrai at the bottom
right. Wnlle activated, the lndlcator next to
the NOTCH swltch glows green.
The notch filter should
afler the desired signal bas been tuned in,
and after the SHlfT control has been ad)usted
for mlnimum adjacent-channel
Press the NOTCH swltch and adjust the control
gradually back and forrh to
where the unwanted heterodyne suddenly drops.
and h
then swltch on
See also § 4 . 1 4
passband relauve to
a desíred signal has
ií lhe signal is being
Norice also that the
of
lhe receiver
sup­
tunlng to
•
The nocch Is actl­
lo
the
be activated only
interíerence.
find the polnt
1 r the heterodyne levei i s strooger than the
desired signal, the S-mecer indicatlon wlll
dip when the notch is properly set.
notch swltch off before tuning to a new fre­
quency or ad)usting the SHIFT control.
also § 4 . 1 3.3.
4.6.9
AGC (Automatic Gain Concrol)
lf
you have been tunlng around the bands you
may have already noticed tbat the maln mfcro­
processor automatically selects fast AGC when
the tuning knob
allows you to detect weak signa!s while tuning
across the band, even when strong signals are
present.
White listening to a station,
the AGC decay rate that provides the most com­
íortable receptlon,
AGC selector (small knob,
right, next to DIM).
this will be the 'S' {Slow) position, but when
signals are fluttering, or when looking for a
weak signal you may ílnd 'M' (Medium) or 'F'
(Fast) better, at least until you make con­
tact.
For CW, the Medium or Fast posítions
will be helpful at
noisy conditions wl th weak signals.
band Is very qulet and signals are very weak,
the OFF positlon may provide best copy (don't
try this lf i t Is noisy).
20 -
Turn the
i s rotated quickly.
you can select
using the four-posltlon
second from the
Usually, for AM and SSB,
higher speeds or under
When the
See
This