Roofing/R.flt (Roofing Filters) - Yaesu FT DX 9000 CONTEST - MANUAL 2 Operation Manual

D
If the optional Dual Receive Unit (RXU-9000) is installed, three Roofing Filters are available for selection in each VFO
(VFO-A and VFO-B). Operation is identical on either VFO.
As a reminder, there is no difference in the fundamental performance of the two VFOs. Please see page 55 for details.
VFO-A Roofing Filter Operation
Press the VFO-A ROOFING switch (#
Roofing Filter selection.
AUTO 15kHz
As you repeatedly press this switch, you will observe different LEDs
lighting up in the Roofing Filter area of the front panel, denoting
the Roofing Filter currently in use. Also, the selected Roofing Filter
bandwidth will be indicated on the LCD.
Typically, this selection will be set to "AUTO."
The Roofing Filter selection will be memorized independently on
each VFO in the VFO stack.
VFO-B Roofing Filter Operation
1. Pressing the SUB RX switch (#
Dual Receive operation.
When the imbedded LED glows green, this is your
confirmation that Dual Receive is in operation.
2. Press the VFO-B R.FLT switch (#
Roofing Filter selection.
AUTO 15kHz
As you repeatedly press the R.FLT switch (#
lected bandwidth will appear on the LCD.
Typically, this selection will be set to "AUTO."
When "AUTO" is selected, the LED imbedded in the switch
will go out (there always is a roofing filter in the receiver path).
The Roofing Filter selection will be memorized independently
on each VFO in the VFO stack.
Quick Point
The "AUTO" selection of the Roofing Filter is based
on the operating mode. However, you may override
the automatic selection, if band conditions warrant a
different (usually, a tighter) selection.
The AUTO mode Roofing Filter selections are shown
below:
AM/FM/FM-PKT
LSB/USB/PKT
CW/RTTY
When the Roofing filter mode is set to "AUTO" and
the Noise Blanker is turned On, the Roofing Filter
bandwidth will automatically be set to 15 kHz, as this
setting provides the most effective noise blanking.
However, you still may override the automatic set-
ting, and select a more narrow Roofing Filter. Noise
blanking may be compromised, however, with a tighter
Roofing Filter in the line.
FT 9000 C
DX ONTEST
R
UAL ECEIVE
ROOFING/R.FLT ( R
) to toggle the
6kHz 3kHz AUTO
) will engage
) to toggle the
6kHz 3kHz AUTO
), the se-
15kHz
6kHz
3kHz
O M
PERATION ANUAL
( RXU-9000 )
U
NIT
)
F
OOFING ILTERS
Roofing Filter bandwidth will be indicated on the LCD
R.FLT Switch ROOFING Switch
Roofing Filter bandwidth will
be indicated on the TFT
VFO-B VFO-A
Page 145