Yaesu FT DX 3000 Operating Manual page 58

i
nterference
iF notch F
ilter
he I filter is a highly effecti e system that allo s you to slice out an interfering eat note or other carrier
signal from inside the receiver passband.
ress the [ NOTCH
. utton to acti ate the otch fil-
inside the [ NOTCH button glows or-
ter. he
ange and the current null position of the
filter ill appear in the
display. The [ NOTCH
adjustment knob.
otate the [ NOTCH
.
tion of the otch filter.
A :
dvice
he fre uency display ill sho the otch fre uen-
cy for 3 seconds whenever the [ NOTCH knob is
turned.
. o cancel the
button momentarily. The graphic disappears from the
indicator on the display confirming that the
filter is no longer in operation.
A :
dvice
lternate presses of the [ NOTCH
s itch the filter et een on and off.
A :
dvice
he I ilter selection
independently on each
.
Page 56
r
ejection
o
perAtion
indicator on the
no functions as the otch
no to adjust the null posi-
filter press the [ NOTCH
utton
ill e memori ed
stac of and
( SSb/cw/rtty/dAtA/AM M
[ NOTCH ] Button
ill
he performance of the I
trated in igure A
of the [ NOTCH
you can see the notching effect of the I
filter as you rotate the [ NOTCH knob to elimi-
nate the interfering heterodyne.
A
Desired Signal
QRM
(Heterodyne)
IF BANDWIDTH
FT
odeS
width i
ndicAtor
filter is illus-
here the effect of rotation
no is depicted. In igure B
B
Desired Signal
QRM
(Heterodyne)
IF BANDWIDTH
NOTCH
3000 O
DX peraTing
)
M
anual