Yaesu FTdx5000 Series Operating Manual page 41

A I
DVANCED NTERFERENCE
The FT 5000 includes an unmatched array of RF selectivity-enhancing features. Please study the material below care-
DX
fully, so as to understand the various features completely.
U
SING THE
The VRF system is a high-performance RF front-end preselector that has high Q factor and low insertion loss. VRF pro-
vides outstanding rejection of out-of-band signals, and can significantly improve reception in tough co-location operations
such as a contest or DX-pedition. The FT
VFO-A VRF Setup
ˆ Press the ( VFO-A )[ VRF ] button. The imbedded LED
in the ( VFO-A )[ VRF ] button is glows red, and the
" " icon will appear at the FLT column of the Block
Diagram Display on the display. The VRF system will
be engaged, centered on your current amateur band.
The ( VFO-A )[ SELECT ] knob will now functions as
the VRF knob.
ˆ You may rotate the ( VFO-A )[ SELECT ] knob to skew
the position of the VRF system relative to your operat-
ing frequency.
A :
DVICE
€ You may observe the relative skew
of the VRF system in the Tuning
Offset Indicator on the display and the SUB DIS-
PLAY- II .
€ After moving the passband of the VRF system
manually, you may re-center it on the current Ama-
teur band by pressing the ( VFO-A )[ CLEAR ] but-
ton.
ˆ To switch VRF off, press the ( VFO-A )[ VRF ] button
until the " " icon shows "
umn of the Block Diagram Display on the display; this
confirms that the VRF circuit has been removed from
the incoming received signal path.
Page 54
-S
UPPRESSION
VRF ( V
ARIABLE
500's VRF system affects the 1.8 - 28 MHz amateur bands only.
DX
" in the FLT col-
( VFO-A )[ VRF/—-T ] Button
[ CLEAR ] Button
( VFO-A )[ SELECT ] Knob
F
EATURES RF F
RF F - F
RONT END
VFO-B VRF Setup
ˆ Press the ( VFO-B )[ RX ] button to engage the Dual
Receive operation. The imbedded LED in the ( VFO-
B )[ RX ] button is glows green.
ˆ Press the ( VFO-B )[ VRF ] button. The imbedded LED
in the ( VFO-B )[ VRF ] button is glows red, and the
" " icon will appear at the FLT column of the Block
Diagram Display on the display. The VRF system will
be engaged, centered on your current amateur band.
The ( VFO-B )[ SELECT ] knob will now functions as
the VRF knob.
ˆ You may rotate the ( VFO-B )[ SELECT ] knob to skew
the position of the VRF system relative to your operat-
ing frequency.
A :
DVICE
€ You may observe the relative skew of the VRF sys-
tem in the SUB DISPLAY- III .
€ After moving the passband of the VRF system
manually, you may re-center it on the current Ama-
teur band by pressing the ( VFO-B )[ CLEAR ] but-
ton.
ˆ To switch VRF off, press the ( VFO-B )[ VRF ] button.
The " " icon shows "
the Block Diagram Display on the display; this con-
firms that the VRF circuit has been removed from the
incoming received signal path.
FT 5000 O
DX
E
RONT ND
)
ILTER
" in the FLT column of
( VFO-B )[ VRF ] Button
[ CLEAR ] Button
( VFO-B )[ SELECT ] Knob
M
PERATING ANUAL