Yaesu Musen 20461X50 Scanning Receiver User Manual FTDX3000 Operating Manual

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Document ID	1770292
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Document Description	Users Manual 7
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Document Type	User Manual
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Date Submitted	2012-08-20 00:00:00
Date Available	2013-02-16 00:00:00
Creation Date	2012-08-02 15:47:09
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Document Title	FTDX3000_Operating_Manual
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Document Author:	YAESU MUSEN CO., LTD.

Interference Rejection
FCC ID: K6620461X50 / IC: 511B-20461X50
CONTOUR Control Operation
The Contour filtering system provides a gentle perturbation of the IF filter passband. The Contour is set to either suppress, or boost specific frequency components, and thus enhance the sound and readability of a received signal.
1. Press the [CONT/APF] button to activate the Contour filter. The LED inside the [CONT/APF] button
glows orange and the current “null” (or “peak”) position of the Contour filter will appear in the CONTOUR indicator on the display.
2. Rotate the [CONT/APF] knob to achieve the most
natural-sounding audio reproduction on the incoming signal.
Advice:
The display will show the Contour frequency for 3
seconds whenever the [CONT/APF] knob is turned.
3. To cancel Contour tuning, press the [CONT/APF]
button momentarily.
Advice:
Alternate presses of the [CONT/APF] button, will
switch the Contour filter between on or off.
Advice:
 The Contour filter selection will be memorized independently on each VFO stack of VFO-A and VFO-B.
 The Contour filter level (either a null or a peak) may
be adjusted using Menu item “109 RX DSP CONTOUR LEVEL”. The factory default setting is for a
null of –15 (dB).
 The bandwidth over which the Contour filter effect is
applied may be adjusted using Menu item “110 RX
DSP CONTOUR WIDTH”. The factory default setting
is 10.
 When the optional DMU-2000 Data Management
Unit is connected, the Audio Scope (on the “Oscilloscope” page) is particularly useful when adjusting
the Contour control. Not only can you see the effect
of the null/peak of the Contour system, but you also
can see the position of the null/peak with respect to
frequency components of interest on the incoming
signal. You may then observe (on the Audio Scope)
the effect of the Contour control while listening to
the effect on the signal, and this will help build your
intuition on how best to use Contour tuning in the
future.
[CONT/APF] Knob [CONT/APF] Button
Refer to Figure “B”, this illustrates an “indentation” of the Contour filter in the center of the
passband. The Contour filter is placing a low-Q
“notch” (per the setting of Menu item “069
RGEN CNTR LV”, referenced above) in the passband. Counter-clockwise rotation (to the left)
of the [CLAR/VFO-B] knob causes the notch
to move towered a lower frequency within the
passband, while clockwise rotation (to the right)
causes the notch to move toward a higher frequency within the passband. By removing interference or unwanted frequency components of
the incoming signal, it is possible to make the
desired signal rise out of the background noise/
interference, enhancing intelligibility.
Quick Point:
The steep slopes of the DSP filtering, when adjusted aggressively, can impart an unnatural sound to an incoming signal. Often, a narrow bandwidth is not the key to improving copy; the incoming signal itself may have undesirable or
excessive frequency components, especially in the low frequency range around 100-400 Hz. By judicious use of the
Contour filter, the “shoulder” of the passband response may be altered, or components may be removed from within the
passband, allowing the desired signal to rise above the background noise and interference in a manner not obtainable
with other filtering systems.
FT DX 3000 Operating Manual
Page 49
Interference Rejection
FCC ID: K6620461X50 / IC: 511B-20461X50
IF SHIFT Operation (SSB/CW/RTTY/PKT/AM Modes)
IF SHIFT allows you to move the DSP filter passband higher or lower, without changing the pitch of the incoming signal, and thus reduce or eliminate interference. Because the carrier tuning frequency is not varied, there is no need to retune the operating frequency to eliminate the interference. The total passband tuning range for the IF SHIFT system is
±1 kHz.
1. Rotate the [SHIFT] knob to the left or right to reduce the interference.
Advice:
The display will show the shift value of the IF
SHIFT for 3 seconds whenever the [SHIFT] knob is
turned.
Advice:
The center position of the IF passband will be memorized independently on each VFO stack of VFO-A and
[SHIFT] Knob
VFO-B.
Referring to Figure “A”, note the depiction of the
IF DSP filter as the thick line, with the [SHIFT]
knob in the 12 o’clock position. In Figure “B”, an
interfering signal has appeared inside the original
passband. In Figure “C”, you can see the effect
of rotating the [SHIFT] knob. The interference
level is reduced by moving the filter passband so
that the interference is outside of the passband.
Page 50
FT DX 3000 Operating Manual
Interference Rejection
FCC ID: K6620461X50 / IC: 511B-20461X50
WIDTH (IF DSP Bandwidth) Tuning (SSB/CW/RTTY/PKT Modes)
The IF WIDTH tuning system allows you to vary the width of the DSP IF passband, to reduce or eliminate interference.
Moreover, the bandwidth may actually be expanded from its default setting, should you wish to enhance incoming signal fidelity when interference on the band is low.
1. Rotate the [WIDTH] knob to the left or right to reduce the interference.
Advice:
The frequency display will show the bandwidth of
the IF passband for 3 seconds whenever the [WIDTH]
knob is turned.
Advice:
The IF Bandwidth will be memorized independently on
each VFO stack of VFO-A and VFO-B.
Referring to Figure “B”, you can see the default
bandwidth on the SSB mode.
By rotating the [WIDTH] knob to the left, the
bandwidth will narrow (see Figure “A”, while
rotation of the [WIDTH] knob to the right, as
depicted in Figure “C”, will increase the bandwidth.
[WIDTH] Knob
Using IF SHIFT and WIDTH Together
The IF SHIFT and Variable IF WIDTH features
together form a very effective interference-fighting filtering system.
For example, in Figure “A”, you can see how interference has appeared both on the high and low
sides of the desired signal. Rotate the [WIDTH]
knob, the interference from one side can be
eliminated (Figure “B”). Next, rotate the [SHIFT]
knob to re-positioning the passband (Figure “C”),
the interference on the opposite side can be removed, without re-introducing the interference
previously eliminated in Figure “B”.
The default bandwidths, and total bandwidth adjustment range, will vary according to the operating mode:
SSB Mode: 1.8 kHz ~ 4.0 kHz (default: 2.4 kHz).
CW Mode: 500 Hz ~ 2.4 kHz (default: 2.4 kHz)
RTTY/PKT Modes: 500 Hz ~ 2.4 kHz (default:
500 Hz)
Advice:
For best interference reduction, the WIDTH and
SHIFT features are the primary tools you should
use. After narrowing the bandwidth (WIDTH)
and/or adjusting the center of the passband
(SHIFT). The Contour control may then yield
additional signal-enhancement benefits on
the net residual bandwidth. Even more, the IF
NOTCH Filter (described later) may also be
used, in conjunction with these filter systems, to
significant advantage.
FT DX 3000 Operating Manual
Page 51
Interference Rejection
FCC ID: K6620461X50 / IC: 511B-20461X50
NARROW (NAR) One-Touch IF Filter Selection
Pressing the [NAR] button provides one-touch, mode-specific, selection of a narrow IF DSP filter setting that does not
require resetting the [WIDTH] knob.
Pressing the [NAR] button once more returns the bandwidth control to the WITDH/SHIFT system. The factory
default bandwidths are:
Operating Mode
SSB
CW
RTTY/PKT-L/PKT-U
PKT-FM
AM
FM (28/50 MHz Bands)
[NAR] Switch
“ON”
“OFF”
200 Hz ~ 1.8 kHz
1.8 ~ 4.0 kHz
(1.5 kHz)
(2.4 kHz)
100 ~ 500 Hz
500 Hz ~ 2.4 kHz
(500 Hz)
(2.4 kHz)
100 ~ 500 Hz
500 Hz ~ 2.4 kHz
(300 Hz)
(500 Hz)
9 kHz
16 kHz
6 kHz
9 kHz
9 kHz
16 kHz
: Depends on the [WIDTH] knob
( ): Default Bandwidth
[NAR] Button
Advice:
”
 When the narrow bandwidth is selected, the “
icon will appear in the display.
 Even if the [NAR] button has been pressed to engage the narrow filter, you may adjust the narrow IF
bandwidth by rotating the [WIDTH] knob. The IF
SHIFT still is operational. For many applications,
you may find that simply pressing the [NAR] button
instead of adjustment of the [WIDTH] knob, may be
satisfactory for interference reduction.
 When you press the [NAR] button in the FM mode,
both transmit and receive bandwidths are narrowed.
Page 52
FT DX 3000 Operating Manual
Interference Rejection
FCC ID: K6620461X50 / IC: 511B-20461X50
IF NOTCH Filter Operation (SSB/CW/RTTY/PKT/AM Modes)
The IF NOTCH filter is a highly effective system that allows you to slice out an interfering beat note or other carrier
signal from inside the receiver passband.
1. Press the [NOTCH] button to activate the Notch filter. The LED inside the [NOTCH] button glows orange and the current “null” position of the NOTCH
filter will appear in the NOTCH indicator on the
display. The [NOTCH] knob functions as the Notch
adjustment knob.
2. Rotate the [NOTCH] knob to adjust the “null” position of the Notch filter.
Advice:
The frequency display will show the Notch frequency for 3 seconds whenever the [NOTCH] knob is
turned.
3. To cancel the NOTCH filter, press the [NOTCH]
button momentarily. The graphic disappears from the
NOTCH indicator on the display, confirming that the
NOTCH filter is no longer operation.
Advice:
Alternate presses of the [ NOTCH ] button, will
switch the NOTCH filter between on or off.
Advice:
 The IF NOTCH Filter selection will be memorized
independently on each VFO stack of VFO-A and
VFO-B.
 When the optional DMU-2000 Data Management
Unit is connected, the effect of the IF NOTCH filter
may be observed on the Audio Scope (on the “Oscilloscope” page). The Notch will be observed as a
“dip” in the noise platform observed. What’s more,
the “Waterfall” display may be used to observe the
effect of the IF NOTCH filter, which will appear as a
white area in the colored background area.
FT DX 3000 Operating Manual
[NOTCH] Button
The performance of the IF NOTCH filter is
shown in Figure “A”, where the effect of rotation
of the [NOTCH] knob is depicted. In Figure “B”
you can see the notching effect of the IF NOTCH
filter as you rotate the [NOTCH] knob to eliminate the incoming interference.
Page 53

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