Oofing Ilters - Yaesu FT DX 3000 Operating Manual

i
nterference
arro and oofing ilters of
ilter and idths are pro ided in the first I right after the first mi er. hese filters pro ide protection
er and other circuitry that follo and can dramatically impro e reception on a ery cro ded and during a con-
test etc. . ypically the
phone and you may ish to select for e ample the
ress the [ R.FLT
utton to toggle the
selection.
1 2
AUTO* 300 Hz*
6 kHz
he selection mode selects the optimum and idth of
the oofing filter for the reception mode.
In this case the selected and idth in the .
loc iagram isplay glo s yello
e uires optional
A :
dvice
In the mode only the
is utili ed.
s you repeatedly press the [ R.FLT
selected oofing ilter and idth
in the . column of the loc
on the display denoting the oofing ilter cur-
rently in use.
ypically this selection ill e set to
he oofing ilter selection ill e memori ed inde-
pendently on each
q p :
uicK oint
he selection of the oofing ilter is ased on
the operating mode. o e er you may o erride the au-
tomatic selection if and conditions warrant a different
usually a tighter selection.
Page 50
r
ejection
r.Flt ( r
selection mode is satisfactory for most operating situations ut in an e tremely cro ded
oofing ilter
600 Hz 3 kHz
AUTO .....
15 kHz
column of the
ormally glo s lue .
arro ilter.
oofing ilter
utton the
ill e displayed
iagram isplay
.
stac of and
)
F
ooFing ilterS
and re uires optional
roofing filter for operation.
[ R.FLT ] Button
b
locK
.
t :
erMinology
oofing ilter as its name implies places a
over the receiver IF system bandwidth. Starting at the
first mi er the oofing filter protects the circuitry do n-
stream from strong signals just as a roof on a house
protects the contents from rain and snow.
FT
DX
for the nd mi -
Indicates the receiver
IF Roofing Filter
d d
iAgrAM iSplAy
3000 O M
peraTing anual
arro
oof