Page 64
FT
DX
5000 O
PERATING
M
ANUAL
D
IGITAL
N
OISE
R
EDUCTION
(
DNR
)
O
PERATION
The Digital Noise Reduction (DNR) system is designed to reduce the level of random noise found on the HF and 50 MHz
bands. It is especially effective during SSB operation. By rotating the [
DNR
] knob, any of 15 different noise-reduction
algorithms can be selected; each of these algorithms was created for dealing with a different noise profile, and you will want
to experiment with the DNR system to find the best setting according to the noise currently being experienced.
VFO-A DNR Operation
Press the (
VFO-A
)[
DNR
] button. The button will glow
red, and the current noise-reduction algorithm will ap-
pear in the
SUB DISPLAY-
II
window. The (
VFO-
A
)[
SELECT
] knob will now function as the notch
adjustment knob.
Rotate the (
VFO-A
)[
SELECT
] knob to select the set-
ting that most effectively reduces the noise level.
Press the (
VFO-A
)[
RESET
] button to set the noise-
reduction algorithm to default.
To switch the DNR system off, press the (
VFO-
A
)[
NOTCH
] button once more.
D
IGITAL
N
OTCH
F
ILTER
(
DNF
)
O
PERATION
The Digital Notch Filter (DNF) is an effective beat-canceling filter that can null out a number of interfering beat notes
inside the receiver passband. Because this is an Auto-Notch feature, there is no adjustment knob associated with this filter.
A
DVICE
:
If a very strong interfering carrier is encountered, we recommend you first use the IF notch filter, as it is the most effective
notching tool in the receiver section.
VFO-A DNF Operation
Press the (
VFO-A
)[
DNF
] button. The button glows red,
confirming that the DNF system is engaged.
To switch the DNF system off, press the (
VFO-
A
)[
DNF
] button once more.
VFO-B DNR Operation
Press the (
VFO-B
)[
DNR
] button. The (
VFO-B
)[
DNR
]
button glows red, and the current noise-reduction al-
gorithm will appear in the
SUB DISPLAY-
II
window.
The (
VFO-B
)[
SELECT
] knob will now function as
the notch adjustment knob.
Rotate the (
VFO-B
)[
SELECT
] knob to select the set-
ting that most effectively reduces the noise level.
Press the (
VFO-B
)[
RESET
] button to set the noise-
reduction algorithm to default.
To switch the DNR system off, press the (
VFO-
B
)[
NOTCH
] button once more.
(VFO-A)[SELECT] Knob
(VFO-B)[SELECT] Knob
(VFO-B)[DNR] Button
[RESET] Button
(VFO-A)[DNR] Button
[RESET] Button
(VFO-A)[DNF] Button
(VFO-B)[DNF] Button
VFO-A DNF Operation
Press the (
VFO-B
)[
DNF
] button. The button glows
red, confirming that the DNF system is engaged.
To switch the DNF system off, press the (
VFO-
B
)[
DNF
] button once more.
A
DVICE
:
You may select the display pattern shown in the
SUB DIS-
PLAY
window from three patterns via Menu item “
019
DISP SELECT
”. See page 122 for details.
I
NTERFERENCE
R
EJECTION
(
S
IGNALS
WITHIN
3
KHZ
)
