Yaesu Musen 20251X70 Users Manual
A
DVANCED INTERFERENCE
The FT-2000D includes an unmatched array of RF selectivity-enhancing features. Please study the material below carefully, so as to understand the various features completely.
-S
UPPRESSION
F
EATURES: RF F
RONT END
USING THE VRF (VARIABLE RF FRONT-END FILTER
The VRF system is a high-performance RF front-end preselector that has high Q factor and low insertion loss. VRF provides 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-2000D’s VRF system affects the 1.8 - 28 MHz amateur bands only.
1. Press the [VRF] button momentarily. The “ ” icon
will appear at the FLT column of the Receiver Configuration Indicator on the display, and the VRF system will be
engaged,
centered on
your current Amateur band.
2. You may rotate the [VRF] knob to skew the position
of the VRF system relative to your operating frequency.
Because the VRF system is relatively broad, although
still much narrower than the fixed bandpass filter), you
may not hear much difference in the background noise
or signal quality when you make minor adjustments.
However, if you have receiving problems associated
by a very strong signal, rotation of the [VRF] knob
may help reduce the strength of the interfering station,
allowing improved reception of the desired signal if
overload was degrading reception.
ADVICE :
You may observe the
relative skew of the
VRF system in the Tuning Offset Indicator on
the display while turning
the [VRF] knob.
After moving the passband of the VRF system
manually, you may re-center it on the current Amateur band by pressing and holding in the [VRF
button for two seconds.
3. To switch VRF off, press the [VRF] button until the
“ ” icon shows “ ” in the FLT column of the
Receiver Configuration Indicator on the display; this
confirms that the VRF circuit has been removed from
the incoming received signal path.
ADVIC E:
The VRF filter affects both the Main (VFO-A) and Sub
(VFO-B) bands.
The VRF Filter operational status will be memorized
independently on each VFO in the VFO stack.
QUICK POINT:
The VRF filter, utilizing high-quality coils and capacitors
that provide high Q, yields a passband that is approximately
]
20% to 30% the width of a traditional, fixed bandpass filter. As a result, significantly more “unwanted” signal rejection is provided. Within each Amateur band, the following adjustment steps are provided, if you wish to skew
the response in a particular direction so as to enhance interference rejection even more. The actual “sound” of the
signal you are listening to will remain unchanged, however.
AMATEUR BAND
1.8 MHz
3.5 MHz
10 MHz
14 MHz
18 MHz
21 MHz
24.5 MHz
28 MHz
Receiver Configuration Indicator
Offset Tuning Indicator
5 MHz
7 MHz
)
[
VRF] Button
[
VRF] Knob
VRF ADJUSTMENT STEPS
62 steps
62 steps
62 steps
62 steps
30 steps
30 steps
20 steps
20 steps
20 steps
20 steps
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R.FLT (ROOFING FILTERS
Narrow-band Roofing Filters of 15 kHz, 6 kHz, and 3 kHz bandwidths are provided in the first IF, right after the first mixer.
These filters provide protection fort the 2nd mixer, DSP, and other circuitry that follow and can dramatically improve
reception on a very crowded band (during a contest, etc.). Typically, the AUTO selection mode is satisfactory for most
operating situations, but in an extremely crowded phone band you may wish to select, for example, the 3 kHz roofing filter
for SSB operation.
Press the [R.FLT] button to toggle the Roofing
Filter selection.
AUTO 15 kHz 6 kHz 3 kHz AUTO
ADVICE :
The Roofing filter selection affects the Main band
(VFO-A) only. The Sub band’s (VFO-B) Roofing filter is fixed at a bandwidth of 15 kHz.
As you repeatedly press the [R.FLT] button, you will
observe changes in the notation in the R.FLT column
of the Receiver Configuration Indicator on the display,
denoting the
Roofing Filter currently
in use.
Typically, this selection will be set to “AUTO.”
The Roofing Filter selection will be memorized inde-
pendently on each VFO in the VFO stack.
)
Receiver Configuration Indicator
[
R.FLT] Button
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: 15 kHz
LSB/USB/PKT: 6 kHz
CW/RTTY: 3 kHz
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 setting, and
select a more narrow Roofing Filter. Noise blanking
may be compromised, however, with a tighter Roofing
Filter in the line.
TERMINOLOGY:
A “Roofing Filter,” as its name implies, places a “Roof”
over the receiver’s IF system bandwidth. This “Roof” protects the circuitry downstream from the first mixer from
interference, just as a roof on a house protects the contents
from rain and snow.
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CONTOUR CONTROL OPERATION
The Contour filtering system provides a gentle perturbation of the IF filter passband, so as to suppress or enhance certain
frequency components, thus enhancing the sound and/or readability of a received signal.
[
1. Press the [CONTOUR] button. The Contour notation
will appear in the display to confirm that the Contour
filter is engaged.
2. Rotate the [CONTOUR] knob to achieve the most
natural-sounding audio reproduction on the incoming
signal.
3. To cancel Contour tuning, press the [CONTOUR] button once more.
ADVICE :
The Contour filter affects the Main band (VFO-A) only.
You may observe the graphically-depicted peak posi-
tion of the CONTOUR Filter in the CONTOUR indicator on the display.
CONTOUR Indicator
CONTOUR] Button
[
CONTOUR] Knob
)
[
CONTOUR] button
Fully Clockwise
[
CONTOUR] button
Center
[
CONTOUR] button
Fully Counter-Clockwise
CONTOUR GAIN “MINUS” CONTOUR GAIN “PLUS”
The Contour filter’s level (either nulling or peaking)
may be adjusted using Menu item “090 rdSP CNTR
LV.” 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 “091 rdSP
CNTR WI.” 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.
[
CONTOUR] button
Fully Clockwise
[
CONTOUR] button
Center
[
CONTOUR] button
Fully Counter-Clockwise
With reference to Figure “B,” note the initial posi-
tion (12 o’clock) of the [CONTOUR] knob when
the [CONTOUR] button is pushed. You may observe the “indentation” in the receiver passband
where the Contour filter is placing a low-Q “notch”
(per the setting of Menu item “090,” referenced
above). Counter-clockwise rotation (to the left) of
the [CONTOUR] knob causes the indentation to
move towered a lower frequency within the passband, while clockwise rotation (to the right) causes
the indentation to move toward a higher frequency
within the passband. By removing interference or
unwanted frequency components on the incoming
signal, it is possible to make the desired signal rise
out of the background noise/interference, enhancing intelligibility.
AB C
IF
BANDWIDTH
IF
BANDWIDTH
IF
BANDWID TH
QUICK POINT:
The steep slopes of the DSP filtering can, when adjusted aggressively, impart an unnatural sound to an incoming signal.
Oftentimes, though, 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 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.
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IF SHIFT OPERATION
IF Shift allows you to vary the DSP filter passband higher or lower, without changing the pitch of the incoming signal, so as
to reduce or eliminate interference. Because the carrier tuning frequency is not varied, there is no need to re-tune the
operating frequency when eliminating the interference. The total passband tuning range for the IF Shift system is ±1 kHz.
Rotate the [SHIFT] knob to the left or right to reduce the
interference.
ADVICE :
The [SHIFT] knob affects the Main band (VFO-A)
only. However, you may shift the Sub band (VFO-B)
filter passband via Menu items “042 S-iF LSB SET”
through “049 S-iF PKT-USB.”
The position of the passband set by the IF Shift can be
observed on the display.
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 so as to reduce the interference level by moving the filter passband so
that the interference is outside of the passband.
(
SSB/CW/RTTY/PKT/AM MODES
SHIFT Indicator
]
)
[
SHIFT] knob
AB C
Desired Signal Desired Signal Desired Signal
QRMQRM
IF
BANDW IDTH
IF
BANDWIDTH
IF
BANDWID TH
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WIDTH (IF DSP BANDWIDTH) TUNING
The IF Width tuning system allows you to vary the width of the DSP IF passband, so as to 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.
Rotate the [WIDTH] knob to adjust the bandwidth.
Counter-clockwise rotation reduces the bandwidth, while
clockwise rotation increases the bandwidth.
ADVICE :
The IF Width affects the Main band (VFO-A) only.
The bandwidth of the IF can be observed on the dis-
play.
CAUTION:
When rotating the [WIDTH] control fully counter-clockwise, the transition between 50 Hz and 25 Hz bandwidth
may be accompanied by a “ping” sound, depending on the
amount of noise present. This is a normal condition, and
you should turn down the volume, when wearing headphones, to minimize the amplitude of this momentary
sound.
Referring to Figure B, you can see the default bandwidth with the [WIDTH] knob set to the 12 o’clock
position.
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 widen the bandwidth.
AB C
(
SSB/CW/RTTY/PKT MODES
WIDTH Indicator
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. By rotating the [WIDTH
knob, as shown in Figure “B,” the interference from
one side can be eliminated, and by re-positioning
the [SHIFT] knob (Figure “C”), the interference
on the opposite side can be removed, without reintroducing the interference previously eliminated
in Figure “B.”
)
[
WIDTH] Knob
]
IF
BANDW IDTH
The default bandwidths, and total bandwidth adjustment range, will vary according to the operating mode:
SSB Mode:
CW Mode:
RTTY/PKT Modes:
200 Hz ~ 4.0 kHz (2.4 kHz)
25 Hz ~ 2.4 kHz (2.4 kHz)
: bandwidth at 12 o’clock position of [WIDTH] knob.
IF
BANDWIDTH
25 Hz ~ 2.4 kHz (500 Hz)
IF
BANDWID TH
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 also yield additional signalenhancement benefits on the net residual bandwidth.
What’s more, the IF Notch Filter (see the next section) may also be utilized, in conjunection with the
three other filter systems, to significant advantage.
AB C
Desire d Signal Des ired Signal Desir ed Signal
IF
BANDWID TH
QRMQRM
IF
BANDWID TH
QRM
IF
BANDWID TH
QRMQRMQRM
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IF NOTCH FILTER OPERATION
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. The Notch characteristic
will appear in the display to confirm that the Notch
filter is engaged.
2. Initially, rough adjustment of the center frequency of
the IF Notch Filter is adjusted using the outer
[
COARSE] knob; thereafter, fine tuning of the Notch
frequency is adjusted using the inner [FINE] knob.
3. To switch the IF Notch filter off, press the [NOTCH
button once more. The Notch notation will turn off,
confirming that the IF Notch filter is no longer operating.
ADVICE :
The IF Notch filter affects the Main band (VFO-A)
only.
You may observe the graphically-depicted peak (maxi-
mum null) position of the IF Notch Filter in the NOTCH
indicator on the display.
The width of the IF Notch null may be adjusted using
Menu item “092 rdSP NOTCH W.” Both “Wide” and
“Narrow” selections are available, with “Narrow” providing the least disruption of the “desired” signal.
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. The tuning rate for the IF
Notch is somewhat slow while you adjust the [FINE
knob, so the use of the Waterfall display to confirm
proper adjustment is highly recommended.
(
SSB/CW/RTTY/PKT/AM MODES
NOTCH Indicator
]
The performance of the IF Notch filter is shown in
Figure “A,” where the effect of rotation of the
[
NOTCH] knobs is depicted. In Figure “B,” you
can see the notching effect of the IF Notch filter as
you rotate the [NOTCH] knobs to eliminate the
incoming interference.
AB
Desired Signal Desired Signal
QRM
]
(Heterodyne)
IF
BANDWIDTH
(Heterodyne)
QRM
)
[
NOTCH] Button
IF
BANDWID TH
[
NOTCH] Knob
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DIGITAL NOISE REDUCTION (DNR) OPERATION
The Digital Noise Reduction (DNR) system is designed to reduce the level of random noise found on the HF and 50 MHz
bands, and it is especially effective during SSB operation. By rotating the [DNR] knob, any of sixteen different noisereduction 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.
)
1. Press the [DNR] button. The “ ” icon will appear
in the display, confirming that the DNR system is engaged.
2. Rotate the [DNR] knob to select the setting that most
effectively reduces the noise level.
3. To disable the DNR system, press the [DNR] button
once more. The “ ” icon will turn off, confirming
that the DNR system is not active.
ADVICE :
The Digital Noise Reduction affects the Main band (VFOA) only.
NOTCH Indicator
[
DNR] Knob
[
DNR] Button
DIGITAL NOTCH FILTER (DNF) OPERATION
The Digital Notch Filter (DNF) is an effective beat-cancelling 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.
ADVICE :
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.
[
1. Press the [DNF] button. The “ ” icon will
appear in the display, confirming that the DNF
system is engaged.
2. To cancel DNF operation, press the [DNF] button once
more. The “ ” icon will turn off, confirming that
the Digital Notch Filter is no longer in operation.
ADVICE :
The Digital Notch Filter affects the Main (VFO-A) band
only.
DNF] Button
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NARROW (NAR) ONE-TOUCH IF FILTER SELECTION
Main band (VFO-A) “One-Touch Narrow” Operation
Pressing the [NAR] button provides one-touch, mode-specific selection of a narrow IF DSP filter setting that does not depend on the setting of
the [WIDTH] knob. Pressing the [NAR] button once more returns the bandwidth control
to the Width/Shift system. The factory default bandwidths are:
[
OPERATING MODE
SSB
CW
RTTY/PKT-L/PKT-U
PKT-FM
AM
FM (28/50 MHz Bands
)
ADVICE :
When the narrow bandwidth is selected, the “ ”
icon will appear in the display and the bandwidth on
the WIDTH indicator in the display will be reduced.
The bandwidth applied when the [NAR] button is
pressed may be adjusted using the Menu. This allows
you to customize a quick-switch “Narrow” bandwidth
matching your operating needs. The default values for
each mode below are underlined.
SSB mode: Menu item “104 rdsP SSB NAR”
200/400/600/850/1100/1350/1500/1650/
1800/1950/2100/2250 Hz
CW mode: Menu item “095 rdsP CW NARR”
25/50/100/200/300/400/500/800/1200/1400/
1700/2000 Hz
PSK mode: Menu item “098 rdsP PSK NAR”
25/50/100/200/300/400 Hz
RTTY mode: Menu item “101 rdsP RTY NAR”
25/50/100/200/300/400 Hz
When the [NAR] button has been pushed so as to en-
gage the narrow filter, the [WIDTH] knob will be disabled, but IF Shift still is operational. For many applications, you may find that simple adjustment of the
[
WIDTH] knob, instead of engaging the Narrow filter,
may be satisfactory for interference reduction.
You may adjust the CW bandwidth using the [WIDTH
knob, even if the narrow filter is engaged. In this case,
available bandwidth selections are 25 Hz ~ 2 kHz.
When you press the [NAR] button in the FM mode,
both the transmit and receive bandwidths are narrowed.
NAR] SWITCH
“ON”
1.8 kHz
500 Hz
300 Hz
9 kHz
6 kHz
9 kHz
: Depends on the [WIDTH] knob
“OFF”
16 kHz
9 kHz
16 kHz
Sub band (VFO-B
1. Press the [B] button.
2. Within five seconds of pressing the [B] button (while
the imbedded orange LED is blinking), press the [NAR
button to toggle the bandwidth between “wide” and
“narrow.” When the narrow bandwidth is selected, the
“ ” icon will appear in the display.
OPERATING MODE
SSB
CW
RTTY/PKT-L/PKT-U
PKT-FM
AM
FM (28/50 MHz bands
]
3
)
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[
NAR] Button
[
WIDTH] KnobWIDTH Indicator
)
“One-Touch Narrow” Operation
[B]
Button
[
NAR] Button
[
NAR] SWITCH
“ON”
1.1 kHz
1.2 kHz
(300 Hz/500 Hz)
1.2 kHz
9 kHz
)
: Requires the optional CW Narrow Filter
6 kHz
9 kHz
300 Hz: YF-122CN, 500 Hz: YF-122C
“OFF”
2.25 kHz
2.0 kHz
1.2 kHz
16 kHz
9 kHz
16 kHz
]
NOTE:
When the [NAR] button is pressed, the [WIDTH] knob no
longer functions.
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IF NOISE BLANKER (NB) OPERATION
The FT-2000D includes an effective IF Noise Blanker, which can significantly reduce noise caused by automotive ignition
systems.
)
Main band (VFO-A) NB Operation
1. Press the [NB] button momentarily to reduce shortduration pulse noise such as from switching transients,
automobile ignitions and power lines. The “ ” icon
will appear in the display to confirm that the NarrowNB is operating. Press and hold in the [NB] button for
two seconds to reduce longer-duration man-made pulse
noise. The “ ” icon will blink for five seconds, and
thereafter will appear continuously, to confirm that the
Wide-NB is operating.
2. Advance the [NB] knob to the point where the offending noise is best reduced or eliminated.
3. To end Noise Blanker operation, press the [NB] button once more. The “ ” icon will turn off, confirming that the Noise Blanker is no longer in operation.
ADVICE :
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. The Roofing Filter may be changed to a narrower selection, as
described previously, although Noise Blanker operation may be compromised somewhat when using a narrower Roofing Filter.
When you change the Noise Blanker level on the Main
(VFO-A) side, the Sub (VFO-B) band’s Noise Blanker
level will automatically change to be the same as that
for VFO-A, if the Sub (VFO-B) band’s Noise Blanker
is engaged.
Main Band (VFO-A) “NB” Icon
[NB]
Button
[NB]
[B]
Knob
Button
Sub Band (VFO-B) “NB” Icon
Sub band (VFO-B) NB Operation
1. Press the [B] button.
2. Within five seconds of pressing the [B] button (while
the imbedded orange LED is blinking), press the [NB
button momentarily to reduce short-duration pulse
noise such as from switching transients, automobile ignitions and power lines. The “ ” icon will appear in
the display to confirm that the Narrow-NB is operating.
3. Within five seconds of pressing the [B] button (while
the imbedded orange LED is blinking), press and hold
in the [NB] button for two seconds to reduce longerduration man-made pulse noise. The “ ” icon will
blink for five seconds, then appear continuously, to confirm that the Wide-NB is operating.
4. To end Noise Blanker operation, press the [B] button,
then press the [NB] button. The “ ” icon will turn
off, confirming that the Noise Blanker is no longer in
operation.
]
ADVIC E:
When you change the Noise Blanker level on the Sub
(VFO-B) side, the Main (VFO-A) band’s Noise Blanker
level will automatically change to be the same as that for
VFO-B, if the Main (VFO-A) band’s Noise Blanker is
engaged.
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AGC (AUTOMATIC GAIN CONTROL
The AGC system is designed to help compensate for fading and other propagation effects, with characteristics that can be
of particular value on each operating mode. The basic objective of AGC is to maintain a constant audio output level once
a certain minimum threshold of signal strength is achieved.
Main Band (VFO-A) AGC Selection
Press the [AGC] button repeatedly to select the desired
receiver-recovery time constant. You will observe the AGC
status notation in the AGC column of the Receiver Configuration Indicator on the display, denoting the AGC receiver-recovery time currently in use. For most operation,
we recommend the “AUTO” mode. Additionally, you may
disable the AGC by pressing and holding in the [AGC
button for two seconds.
]
)
[
AGC] Button
[B]
Button
Sub Band (VFO-B) AGC Selection
1. Press the [B] button.
2. Within five seconds of pressing the [B] button (while
the imbedded orange LED is blinking), press the [AGC
button repeatedly to select the desired receiver-recovery time constant. You will observe the AGC notation
below the Sub frequency on the display, denoting the
Sub receiver’s current AGC receiver-recovery time. For
most operation, we recommend the “AUTO” mode.
Additionally, you may disable the AGC by pressing
and holding in the [AGC] button for two seconds.
NOTE:
Pressing the [AGC] button allows selection of the desired
receiver-recovery time constant. Normally, the “AUTO”
selection is satisfactory for most situations, but in the event
of operation on a crowded band where you wish to receive
a weak signal, you may wish to change the setting (to FAST,
for example). The “AUTO” mode selections are:
OPERATING MODE
LSB
USB
CW
AM
FM
RTTY
PKT (FM
PKT (LSB
)
)
AUTO AGC SELECTION
SLOW
SLOW
FAST
FAST
FAST
SLOW
FAST
SLOW
]
ADVIC E:
If the AGC receiver-recovery time is set to “Off” by pressing and holding in the [AGC] button, the S-meter will no
longer deflect. Additionally, you will likely encounter distortion on stronger signals, as the IF amplifiers and the
following stages are probably being overloaded.
QUICK POINT
Several aspects of AGC performance may be configured
via the Menu. However, because AGC can have such a
profound impact on overall receiver performance, we generally do not recommend any changes to the AGC Menu
selections until you are thoroughly familiar with the performance of the FT-2000D.
TERMINOLOGY:
Automatic Gain Control, or AGC, is a circuit that senses
the incoming signal strength, and then limits the gains of
the RF and IF stages so as to keep the output audio volume at a more-or-less constant level. AGC also protects
the RF, IF, Audio, and DSP stages from overload, as it
limits the signal strength that is allowed to flow, irrespective of the input signal level.
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AGC (AUTOMATIC GAIN CONTROL
)
SLOPED AGC Operation
In traditional AGC systems, the audio output from the transceiver becomes essentially fixed once the threshold for
AGC action is reached (usually several dozen dB above the no-signal noise
floor). The FT-2000D, however, includes an innovative Sloped AGC system on the Main band (VFO-A) receiver, that allows the audio volume to
rise and fall slightly according to signal strength. Although the rise/fall slope
is not dramatic, it is sufficient to allow you to use your ear to discern and
separate signals according to signal strength, not just audio frequency.
Using Sloped AGC
1. Press the [MENU] button momentarily to enter the
Menu mode.
2. Use the Main Tuning Dial knob to select Menu item
“088 rout AGC SLP.”
3. Rotate the [SUB VFO-B] knob to change the setting to “SLP.”
4. Press and hold in the [MENU] button for two seconds to save the new setting and exit to normal operation. You will now be using the Sloped AGC
system.
t
u
p
t
u
O
o
i
d
u
A
Input Signal
[
MENU] Button
Main Tuning Dial Knob[SUB VFO-B] Knob
SLOPED
NORMAL
MUTE FEATURE
There may be occasions, during Dual Receive operation, when you want to silence the Main (VFO-A) receiver temporarily so as to concentrate on what’s being received on the Sub (VFO-B) receiver. The Mute feature makes this simple to
accomplish.
Press the Main [RX] LED/switch. The Main (VFO-A) receiver will be silenced, and the green LED in the [RX
switch will blink.
To restore reception on the Main (VFO-A) receiver, just
press the blinking [RX] switch/LED once more.
ADVICE :
If you press the [POWER] switch momentarily while the
transceiver is turned on, the transceiver’s audio will be
muted for three seconds.
(
MAIN (VFO-A) BAND
]
)
Main [RX] Switch
Page 63FT-2000D OPERATING MANUAL
SSB/AM MODE TRANSMISSION
[
MOX] Button
[
METER] Switch
[
MIC] Knob
[
RF PWR] Knob
[
MODE] Button
Main Tuning Dial knob
CLAR
+
1. The operating mode is selected using the [MODE
buttons to the left of the Main Tuning Dial knob, and
the VFO (A or B) to which the selection is applied is
selected by the [A] or [B] button above the [MODE
buttons. Usually, the [A] button glows Red, signifying
that the Main band (VFO-A) is being adjusted. Similarly, pressing the
[B]
button will cause its indicator to
blink Orange for five seconds, signifying Sub band (VFO-B) adjustment. Therefore, press the [A] or [B
]
button to select the desired VFO,
then press the [LSB] or [USB] button to select one of the SSB modes.
For AM operation, press the [AM/
FM] button repeatedly until the im-
bedded LED glows red.
QUICK POINT:
By convention, LSB is used in the 7 MHz and lower
Amateur bands for SSB communication, and USB
is used on the 14 MHz and higher bands (the 10
MHz band is used for CW and data modes only).
When the [AM/FM] button glows orange, it indi-
cates that FM operation is engaged.
2. Rotate the Main Tuning Dial knob to adjust the operating frequency. Alternatively, you may use the [UP]/
[
DWN] scanning buttons on the MH-31B8 Hand Mi-
crophone to sweep up or down the current band.
]
3. Press the microphone’s PTT (Push To Talk) switch to
begin transmission; speak into the microphone in a
normal voice level.
]
ADVIC E:
The “ ” indicator will light up in the frequency
display area, confirming that transmission is in
progress.
When transmitting in the AM mode, rotate the [RF
PWR] knob so as to set a maximum (carrier) power
output of 50 Watts.
4. In the SSB mode, adjust the microphone amplifier gain
to match the microphone and your
voice level, set the [METER
]
switch to the “ALC” position,
close the PTT switch, speak into
the microphone in a normal voice
level, and adjust the [MIC] (gain) knob
so that the ALC voltage (displayed on
the right meter) stays within the ALC
zone of the meter (up to 2/3 of full scale
deflection) on voice peaks.
ADVIC E:
The microphone
gain of the AM
mode has been programmed, at the
factory, to a level
that should be satisfactory for most situations. However, using Menu item “050 A3E MICGAIN,” you may
set a different fixed value, or choose the “Ur” option,
which then lets you use the front panel [MIC] knob to
set the microphone gain in the AM mode. In this case,
the [MIC] knob should not be advanced to the point
where the ALC meter deflects. In many cases, the same
setting as used on SSB will be satisfactory.
5. Release the PTT switch at the end of your transmission. The transceiver will return to the receive mode.
Page 64 FT-2000D OPERATING MANUAL
SSB/AM MODE TRANSMISSION
ADVICE :
ALC meter deflection may be caused by excessive drive
power, but also by reflected power detected in the antenna system. If the impedance presented to the transceiver is different from 50 Ohms, ALC meter action
may be observed that is not related to the proper setting of the [MIC] (gain) knob. Therefore, we recommend that you make [MIC] knob adjustments into a
dummy load or antenna system presenting an impedance very close to 50 Ohms.
Rotate the [RF PWR] knob to set the desired power
output. Clockwise rotation of the [RF PWR] knob will
increase the power. The adjustment
range is between 10 Watts and 200
Watts, and you should always use the
minimum power necessary for maintaining reliable communications.
When performing tests (such as the setup of the [MIC
or [RF PWR] knobs), be sure to check the frequency
before transmitting, so as to avoid interference to others who may already be using the frequency.
Four techniques for exercising Transmit/Receive con-
trol are provided on the FT-2000D, and you may
choose the technique(s) that best suit your operating
needs:
Pressing the microphone’s PTT switch will engage
the transmitter.
The rear panel PTT jack may be connected to a
foot switch or other manual switching device in
order to engage the transmitter.
Pressing the front panel [MOX] button will lock
the transmitter on. Press the [MOX] button again
to return to receive.
The VOX (Voice Operated Xmit) circuit will en-
gage the transmitter automatically when you speak
into the microphone. For details of VOX operation, see page 78.
]
Page 65FT-2000D OPERATING MANUAL
USING THE AUTOMATIC ANTENNA TUNER
The Automatic Antenna Tuner (hereinafter referred to as the “ATU”) built into each FT-2000D is crafted to ensure a 50Ohm load for the final amplifier stage of the transmitter. We recommend that the ATU be used whenever you operate on the
FT-2000D.
ADVICE :
The ATU of the FT-2000D, being located inside the station, only adjusts the impedance presented to the transceiver at
the station end of your coaxial cable feedline. It does not “tune” the SWR at the antenna feedpoint itself. When designing and building your antenna system, we recommend that every effort be made to ensure a low SWR at the antenna
feedpoint.
The ATU of the FT-2000D includes 100 memories for tuning data. Eleven of these memories are allocated, one per
Amateur band, so that each band has at least one setting preset for use on that band. The remaining 89 memories are
reserved for the 89 most-recent tuning points, for quick frequency change without the need to retune the ATU.
The ATU in the FT-2000D is designed to match impedances within the range of 16.5 Ohms to 150 Ohms, correspond-
ing to an SWR of 3:1 or less on the HF amateur bands (6 m amateur band: 25 Ohms to 100 Ohms, corresponding to an
SWR of 2:1 or less). Accordingly, simple non-resonant whip antennas, along with random-length wires and the “G5RV”
antenna (on most bands) may not be within the impedance matching range of the ATU.
ATU OPERATION
1. Rotate the [RF PWR] knob fully clockwise (to the
right).
2. Use the Main Tuning Dial knob to set the radio to the
desired operating frequency within the Amateur band.
3. Press the [TUNE] button momentarily to place the ATU
in the transmit line (no adjustment/tuning will occur
yet). The “ ” icon will appear in the display.
QUICK POINT:
The momentary press of the [TUNE] button will turn
the tuner on, and the microprocessor will automatically
select the tuning point closest to the current operating
frequency.
4. Press and hold in the [TUNE] button for two seconds
to begin automatic tuning. The transmitter will be engaged, and the “ ” icon will blink while tuning is
in progress. When the optimum tuning point has been
reached, the radio will return to receive, and the
“ ” icon will again glow steadily (instead of
blinking).
5. While tuning around the band using the Main Tuning
Dial knob, you will observe that the “ ” icon
blinks momentarily every 10 kHz. This momentary
blinking indicates that a new tuning window has been
entered. If you want to save tuning data associated with
this 10 kHz window, repeat step 4 (above) for each
such window. On bands like 1.8 MHz where the impedance may change rapidly, the storage of a number
of tuning points is recommended.
6. To disconnect the ATU from the transmit line, press
the [TUNE] button momentarily. The “ ” icon
will turn off, confirming that the ATU has been turned
off. In the “Off” mode, the transceiver will be directly
connected to the coaxial cable connected to your antenna, and will operate based on whatever impedance
is present at the station end of the coax.
NOTCH Indicator
ADVIC E:
The ATU circuit is located between the final amplifier and
the rear-panel antenna jack; reception is not affected by
the ATU.
QUICK POINT:
As shipped from the factory, only one ATU alignment
point is saved on each Amateur band. This was memorized during the final alignment and performance verification stages on the production line.
The momentary flickering of the “ ” icon occurs
whenever you cross over into a new 10 kHz ATU
memory window.
NOTE:
Please check the operating frequency before beginning the
tuning process, to be sure you are not interfering with others who may already be using the frequency.
TERMINOLOGY:
Antenna Tuner Memories: The microprocessor of the ATU
makes a note of the positions of the tuning capacitors and
the selected inductors, and stores the data for each 10 kHz
window in which tuning has occurred. This eliminates the
need to re-tune every time you return to a frequency on
which you already have completed the tuning process.
[
DNR] Knob
[
DNR] Button
Page 66 FT-2000D OPERATING MANUAL
USING THE AUTOMATIC ANTENNA TUNER
ABOUT ATU OPERATION
Figure 1 depicts a situation where normal tuning via the ATU has been successfully completed, and the tuning data has been
stored in the ATU memory. The antenna system as seen by the transmitter is shown.
In Figure 2, the operator has changed frequency, and the “ ” icon has become appeared. The operator presses and
holds in the [TUNE] button for two seconds to begin impedance matching using the ATU.
If a high SWR conditions exists (above 3:1), corrective action must be taken in the antenna system to bring the impedance
closer to 50 Ohms. Besides the fact that the ATU will refuse to memorize settings on frequencies where the SWR exceeds
3:1, the high SWR may indicate a mechanical failure in the feed system, and such failures can lead to the generation of
spurious signals causing TVI, etc.
SWR: 2.0
Feed Point SWR
SWR: 1.5
SWR: 1.0
SWR: 3.0
SWR: 2.0
SWR: 1.0
Frequency
Memorized ATU Tuning
Frequency
SWR after ATU Tuning
FIGURE 1
FIGURE 2
The “ ” icon appears on the display
when you transmit on this frequenc y
SWR: 3.0
Retuned Setting
About ATU Memories
SWR (Post-tuning) Less than 1.5:1
The tuning settings are committed to the ATU memory.
SWR (Post-tuning) Greater than 1.5:1
Tuning data will not be retained in memory. If you return to the same frequency, the tuning process must be repeated.
SWR (Post-tuning) Greater than 3:1
The “ ” icon will light up, and tuning settings, if achieved, will not be memorized. Please investigate and
resolve the high SWR condition before attempting further operation using this antenna.
Page 67FT-2000D OPERATING MANUAL
USING THE AUTOMATIC ANTENNA TUNER
LITHIUM BATTERY REPLACEMENT
The memories for the ATU are backed up by a common Lithium backup battery (type CR2032 or equivalent). After two or
more years of heavy use, you may notice that the tuner memories are not being maintained, and that you have to re-tune
when returning to a frequency on which you had previously stored tuning data.
In this case, please replace the ATU Backup Battery using the following procedure:
1. Turn the FT-2000D’s [POWER] switch “off,” then
turn the FP-2000’s [POWER] switch “off.”
2. Unplug the AC cable from the AC jack on the FP-
2000 rear panel, then disconnect the DC cable (having two connectors) from the FT-2000D rear panel.
3. Referring to Figure 1, remove the three screws from each
side of the transceiver and three screws from the top
edge of the rear panel. Slide the top case toward to the
rear about 1/2 inch (1 cm), then remove the top case.
4. Turn the transceiver up side down.
5. Remove the seven screws affixing the bottom case, and
then remove the bottom case (Figure 2).
6. Locate the Lithium battery on the left side of the Control Unit (Figure 3).
7. Turn the BACKUP switch “off.”
8. Follow the guidelines in Figure 4, and remove the old
battery, replacing it with a new one of the identical type.
9. Connect the DC cable (having two connectors) to the
FT-2000D rear panel, then connect the AC cable to
the AC jack on the FP-2000 rear panel.
10
. Turn the FP-2000’s [POWER] switch “on,” then turn
the FT-2000D’s [POWER] switch “on.” Use extreme
caution, as high voltages are present inside the transceiver!
11
. Turn the BACKUP switch “on.”
12
. Turn the FT-2000D’s [POWER] switch “off,” then
turn the FP-2000’s [POWER] switch “off.”
13
. Unplug the AC cable from the AC jack on the FP-
2000 rear panel, then disconnect the DC cable (hav-
ing two connectors) from the FT-2000D rear panel.
14
. Replace bottom case and its seven screws removed in
step 5, and then replace the top case and its nine screws
removed in step 3.
15
. The ATU Backup Battery replacement is now com-
plete.
CAUTION:
Danger of explosion if battery is incorrectly replaced.
Replace only with the same or equivalent type.
QUICK POINT:
When the ATU Backup Battery is replaced, all tuner memories will be erased, and new sets of tuning data will have to
be stored.
Backup Switch
Lithium Backup Battery
After pusing in the direction of the
arrow, move your finger upward.
+
FIGURE 1
Backup Battery
FIGURE 3
Removal of the
FIGURE 2
Installing the
Lithium Backup Battery
Use your fingertip to push in the
indicated direction
+
+
+
NOTES:
FIGURE 4
Use care in the handling and storage of the Lithium battery. It is small, and presents a choking hazard to small children;
therefore keep such batteries out of the reach of children at all times. Do not dispose of Lithium batteries in fire, and do
not attempt to re-charge them under any circumstances.
When opening/closing the case, take care with your screwdriver not to short out internal components, or touch them in
a way that will cause them to short out against other components.
The exhaustion of the ATU backup battery of the FT-2000D is a normal “wear and tear” situation, and the loss of the
backup voltage is not a “defect” or other condition covered by the Limited Warranty on this product. Accordingly, if you
do not feel capable of replacing the battery, and ask a service shop to do so on your behalf, a service fee may apply.
Page 68 FT-2000D OPERATING MANUAL
ENHANCING TRANSMIT SIGNAL QUALITY
ADJUSTING THE SSB TRANSMITTED BANDWIDTH
For transmission on SSB, a default bandwidth of 2.4 kHz is provided. This bandwidth provides reasonable fidelity along
with good talk power, and is typical of the bandwidth used for decades during SSB transmission. However, the bandwidth
may be varied by the operator, so as to provide different levels of fidelity or talk power, according to your preferences.
Here’s how to adjust the transmitted bandwidth on SSB:
1. Press the [MENU] button to engage the Menu.
2. Rotate the Main Tuning Dial knob so as to select Menu
item “083 A3J TX BPF.”
3. Rotate the [SUB VFO-B] knob to select the desired
bandwidth. The available selections are 3000/
50-3000/100-2900/200-2800/300-2700/4002600, and the default is 300-2700 Hz. A wider band-
width will provide greater fidelity, while a narrow bandwidth will compress the available transmitter power
into less spectrum, resulting in more “talk power” for
DX pile-ups.
4. Press and hold in the [MENU] button for two seconds
to save the new setting and exit to normal operation.
ADVICE :
The Transmit Monitor is very helpful way of verifying
the effects on fidelity of changing the bandwidth. Pressing the [MONI] button then adjusting the [MONI] knob
for a comfortable listening level while you are transmitting, you will be able to hear the difference in sound
quality as you make changes.
When the optional DMU-2000 Data Management Unit
is connected, you may verify the effect of your adjustments of the transmitted bandwidth by observing the
Audio Scope on the “Oscilloscope” page.
QUICK POINTS:
The higher fidelity associated with wide bandwidth will
be particularly enjoyable on the low bands, during local rag-chew QSOs.
The “3000” setting is a special hi-fidelity setting,
whereby the transmitted bandwidth is in excess of 3
kHz. This selection, in conjunction with judicious adjustment of the Parametric Microphone Equalizer (see
next chapter) can provide truly outstanding fidelity and
very natural-sounding audio.
When using the wider bandwidth selections (especially
“3000”), the apparent power output from the transmitter may seem lower. This is because the available power
from the transmitter is being distributed over a wider
bandwidth, and the power detection circuitry does not
compensate for the effect of the bandwidth selection
(it is calibrated in the default 2.4 kHz bandwidth).
(
SSB MODE
Main Tuning Dial Knob[SUB VFO-B] Knob
)
[
MENU] Button
Page 69FT-2000D OPERATING MANUAL
ENHANCING TRANSMIT SIGNAL QUALITY
PARAMETRIC MICROPHONE EQUALIZER
The FT-2000D includes a unique Three-Band Parametric Microphone Equalizer, that provides precise, independent control over the low-, mid-, and treble-ranges in your voice wave-form. You may utilize one group of settings for when the
speech processor is off, and an independent group of settings for when the speech processor is on. The speech processor
feature is described on next chapter.
QUICK POINT:
The Parametric Equalizer is a unique technique for adjusting the signal quality. Because the three ranges may be adjusted
so precisely, it is possible to craft a response that provides a more natural and pleasant sound than you have ever experienced before. Effective “talk power” can also be significantly enhanced.
The aspects of configuration that you may adjust on the Parametric Equalizer are:
Center Frequency: The center frequency of each of the three bands may be adjusted.
Gain: The amount of enhancement (or suppression) within each band may be adjusted.
Q: The bandwidth over which the equalization is applied may be adjusted.
(
SSB/AM MODES
)
SETUP THE PARAMETRIC MICROPHONE EQUALIZER
1. Connect the microphone to the MIC jack.
2. Set the [RF PWR] knob to its minimum value, so as not
to cause interference to other users during adjustment.
ADVICE :
We recommend you consider connecting a dummy
load to one of the Antenna jacks, and monitor your
signal on a separate receiver, so as to prevent interference to other users.
You will have the best chance of hearing the ef-
fects of adjustments if you wear headphones (connected to the monitor receiver) while monitoring
your transmitted signal.
3. If you adjust the Parametric Microphone Equalizer
when the speech processor is disabled, press the
[
PROC] button until the “ ” icon will appear in
the display. If you adjust the Parametric Microphone
Equalizer when the speech processor is engaged, press
the [PROC] button until the “ ” and “ ”
icons will appear in the display.
4. Press the [MONI] button, if you want to listen on the
FT-2000D’s internal monitor.
5. Press the [MENU] button momentarily. The Menu list
will appear in the display.
6. Rotate the Main Tuning Dial knob to find the “EQ”
Menu area, containing Menu items “123” through
“131;” these parameters apply to the adjustment of the
Parametric Microphone Equalizer when the speech
processor is disabled. Menu items “132” through “140”
apply to the adjustment of the Parametric Microphone
Equalizer when the speech processor is engaged.
7. Rotate the [SUB VFO-B] knob to perform adjustments
to a particular Menu item.
8. Close the PTT switch, and speak into the microphone
while listening to the effects of the changes you are making (in step 6). Because the overall effect on the sound
will change with each adjustment you make, you should
make several passes through each adjustment area, to
be sure that you are achieving the optimum setting.
[
MONI] Button
[
RF PWR] Knob
9. When you have completed all adjustments, press and
hold in the [MENU] button for two seconds to save
the new settings and exit to normal operation. If you
only press the [MENU] button momentarily to exit,
any changes you performed will not be stored.
ADVIC E:
To roll off excessive bass response in a wide-range studio
microphone, try putting a 10 dB null at 100 Hz with a
bandwidth of “1” or “2,” do about a 3 dB null centered on
800 Hz with a bandwidth of “3,” and then put an 8 dB
peak centered on 2100 Hz with a bandwidth of “1.” These
are starting recommendations; each microphone and user’s
voice will be different, often requiring different settings.
Main Tuning Dial Knob
[
MENU] Button
[
SUB VFO-B] Knob
Page 70 FT-2000D OPERATING MANUAL
ENHANCING TRANSMIT SIGNAL QUALITY
PARAMETRIC MICROPHONE EQUALIZER
ACTIVATES THE PARAMETRIC MICROPHONE EQUALIZER
1. Adjust the [MIC] (gain) knob for SSB use, as described
on page 64.
2. Press the [PROC] button momentarily. The “ ”
icon will appear in the display, confirming that the
Parametric Microphone Equalizer is engaged.
ADVICE
When the “ ” icon blinks, the Parametric Microphone Equalizer setting is not performed.
3. Press the PTT switch on the microphone, and speak
into the microphone in a normal voice level.
4. To switch the Parametric Microphone Equalizer off,
press the [PROC] button several time to disappear the
“ ” icon.
[
PROC] Button
[
MIC] Knob
(
SSB/AM MODES
)
3-STAGE PARAMETRIC EQUALIZER A DJUSTMENTS
Center Frequency “123 tAUd EQ1-FREQ” “100” (Hz) ~ “700” (Hz
Parametric Gain “124 AUd EQ1-LVL”
Q (Bandwidth
3-STAGE PARAMETRIC EQUALIZER A DJUSTMENTS
Center Frequency “132 tAUd PE1-FREQ” “100” (Hz) ~ “700” (Hz
Parametric Gain “133 tAUd PE1-LVL”
Q (Bandwidth
+10dB
n
i
a
G
c
i
r
t
e
m
a
r
a
P
“126 tAUd EQ2-FREQ” “700” (Hz) ~ “1500” (Hz
“129 tAUd EQ3-FREQ” “1500” (Hz) ~ “3200” (Hz
“127 tAUd EQ2-LVL”
“130 tAUd EQ3-LVL”
)
“125 tAUd EQ1-BW”
“128 tAUd EQ2-BW”
“131 tAUd EQ3-BW”
“135 tAUd PE2-FREQ” “700” (Hz) ~ “1500” (Hz
“138 tAUd PE3-FREQ” “1500” (Hz) ~ “3200” (Hz
“136 tAUd PE2-LVL”
“139 tAUd PE3-LVL”
)
“134 tAUd PE1-BW”
“137 tAUd PE2-BW”
“140 tAUd PE3-BW”
(
SPEECH PROCESSOR: “OFF”
(
Low) “–10” (dB) ~ “+10” (dB
(
Mid) “–10” (dB) ~ “+10” (dB
(
High) “–10” (dB) ~ “+10” (dB
(
Low) “1” ~ “10”
(
Mid) “1” ~ “10”
(
High) “1” ~ “10”
(
SPEECH PROCESSOR: “ON”
(
Low) “–10” (dB) ~ “+10” (dB
(
Mid) “–10” (dB) ~ “+10” (dB
(
High) “–10” (dB) ~ “+10” (dB
(
Low) “1” ~ “10”
(
Mid) “1” ~ “10”
(
High) “1” ~ “10”
)
)
)
)
)
)
)
)
)
)
)
)
)
)
f3f2f1
Page 71FT-2000D OPERATING MANUAL
ENHANCING TRANSMIT SIGNAL QUALITY
USING THE SPEECH PROCESSOR
(
SSB/AM MODES
)
The FT-2000D’s Speech Processor is designed to increase “talk power” by increasing the average power output via a
sophisticated compression technique, and also adjusting the signal quality to fit the Speech Processor. The result is improved intelligibility when conditions are difficult.
[
1. Adjust the [MIC] (gain) knob for SSB use, as described
MONI] Button
[
PROC] Button
on page 64.
2. Rotate the [METER] switch fully to the left, so as to
select “COMP” (Compression).
3. Press the [PROC] button until the “
“
” icons will appear in the display; this is the
” and
Speech Processor is engaged.
4. Press the PTT switch on the microphone, and speak
into the microphone in a normal voice level. Observe
the deflection of the meter needle on the COMP meter
scale.
[
METER] Switch
[
MIC] Knob
[
RF PWR] Knob
[
MONI] Knob
[
PROC] Knob
5. Rotate the [PROC] knob so that the meter needle deflects to not more than “10 dB” on the COMP scale.
6. To switch the Speech Processor off, press the [PROC
]
button once more. The “ ” and “ ” icons
will turn off, confirming that the Speech processor is
turned off.
ADVICE :
Excessive advancement of the [PROC] knob will re-
sult in a degradation of the transmitted signal’s signalto-noise ratio, thereby reducing intelligibility at the
other end of the circuit.
The Transmit Monitor is very helpful way of verifying
proper adjustment of the compression level. Pressing
the [MONI] button then adjusting the [MONI] knob
for a comfortable listening level while you are transmitting, you will be able to hear the difference in sound
quality as you make adjustments.
The [RF PWR] knob still controls the RF power out-
put, whether or not the Speech Processor is engaged.
You may adjust the Parametric Microphone Equalizer
when the speech processor is engaged, using Menu
items “132” through “140.” See page 70 for details.
When the optional DMU-2000 Data Management Unit
is connected, you may observe the effect of your compression level adjustments by viewing the wave-form
on the “Oscilloscope” page.
Page 72 FT-2000D OPERATING MANUAL
ENHANCING TRANSMIT SIGNAL QUALITY
NOTE
Page 73FT-2000D OPERATING MANUAL
ENHANCING TRANSMIT SIGNAL QUALITY
LOW- DISTORTION CLASS-A OPERATION
Class-A operation of the FT-2000D transmitter is provided, yielding ultra-low distortion products during SSB operation.
Power output during Class-A operation is 75 Watts.
[
To engage Class-A operation as following:
1. Press the [MENU] button; the Menu list will appear in
the display.
2. Rotate the Main Tuning Dial knob to select Menu item
“141 tGEn BIAS.”
3. Rotate the [SUB VFO-B] knob to select the desired
BIAS level “0 - 100” to set the transceiver for operation anywhere between Class-A and Class-AB (which
has lower heat dissipation but higher distortion products).
Clockwise rotation of the [SUB VFO-B] knob increases the BIAS, and menu setting “100” will place
the transmitter in fully Class-A operation. Counterclockwise rotation of the [SUB VFO-B] knob will
move the transmitter toward Class-AB operation, and
menu setting “Ab” will place the transmitter in fully
Class-AB operation.
4. Press and hold in the [MENU] button for two seconds
to save the new setting and exit to normal operation.
To exit from the Class-A mode, repeat the above procedure, rotating the [SUB VFO-B] knob to select “Ab” in
step 3 above.
Main Tuning Dial Knob[SUB VFO-B] Knob
ADVIC E
We recommend that menu item “141 tGEn BIAS” is programmed to [C.S] button for easy class-A operation.
MENU] Button
Id: Drain Current
VDS: Drain Voltage
CLASS-AB CLASS-A
Page 74 FT-2000D OPERATING MANUAL
ENHANCING TRANSMIT SIGNAL QUALITY
LOW- DISTORTION CLASS-A OPERATION
ADVICE
During Class-A operation, ten Amps of Bias current will be flowing, regardless of the modulation level that leads to
actual power output. Therefore, if the ambient temperature in your operation location is high, the transceiver temperature may rise as well, due to the high bias level (which must be dissipated as heat). Depending on the temperature, you
may wish to reduce the BIAS level using menu item “141 tGEn BIAS,” so as to reduce the amount of heat being
generated.
When the optional DMU-2000 Data Management Unit is connected, you can monitor the heat sink temperature on the
after-maket monitor, you can always be aware of a rise in temperature during Class-A operation. Normally, the temperature is below 80 °C; if it rises to near or above this value, however, we recommend you adjust the BIAS level toward
Class-AB (decrease the numerical value) via menu item “141 tGEn BIAS,” so as to reduce the heat being dissipated.
An innovative aspect of the “Class-A” mode is that the actual power output is always limited to 75 Watts. So even
though you might adjust the BIAS lebel in the direction of Class-AB operation, the power output will not rise; this
eliminates the need, for example, to re-tune your linear amplifier, if used.
QUICK POINT
Class-A operation provides a significant improvement in transmitter distortion suppression. During Class-A, the 3rd-
order IMD products are typically suppressed 50 dB, while the 5th- and higher-order IMD products (that can cause
“splatter” that interferes with others) will typically be suppressed 70 dB or more.
If you are using a linear amplifier such as the VL-1000, the low distortion produced by the FT-2000D’s transmitter
means that these intermodulation distortion products will not exist to be amplified by your linear.
Class-AB 200W PEP IMDClass-A 75W PEP IMD
High-Power 200-Watt Final Amplifier Stage
The final amplifier stage of the FT-2000D utilizes a pair of ST Micro Electronics Corp. SD2931 MOSFET devices
operating at 50 Volts. The push-pull configuration provides low distortion along with high power output. The 120 mm
thermostatically-controlled cooling fan directs forced air across the heat sink, should the heat sink temperature exceed
the temperature that will trigger the thermostat.
Page 75FT-2000D OPERATING MANUAL
TRANSMITTER CONVENIENCE FEATURES
VOICE MEMORY
You may utilize the Voice Memory capability of the FT-2000D for repetitive messages. The Voice Memory system includes four memories capable of storing up to 20 seconds of voice audio each. The maximum that any memory can hold is
20 seconds.
Recording Your Own Voice in Memory
1. Select the LSB, USB, AM, or FM mode using the front
panel [MODE] buttons.
2. Press the [F5(MEM)] button. A blinking “ ” icon
will appear in the display.
3. Within five seconds of pressing the [F5(MEM)] button, press any of the buttons numbered [F1(CH-1
through [F4(CH-4)] to select that memory storage register. If you do not press the PTT switch (see next step)
within five seconds, the memory storage process will
be cancelled.
4. Press the microphone’s PTT switch momentarily, the
“ ” icon will glow steadily, and recording will
begin.
5. Speak into the microphone in a normal voice level to
record the message (such as “CQ DX, CQ DX, this is
W 6 Delta X-Ray Charlie, W 6 Delta X-Ray Charlie,
Over”). Remember that the time limit for recording
any message is 20 seconds.
6. Press the [F5(MEM)] button to terminate the message
storage process.
(
SSB/AM/FM MODES
Checking Your Recording
1. Be sure that the front panel [MOX] button is “Off”
(the LED imbedded in the switch is must be off).
2. Press the [F1(CH-1)] ~ [F4(CH-4)] button (whichever one you just recorded in), and you will hear the
contents of the voice memory you just recorded.
)]
ADVIC E:
You may adjust the playback level of the recording via
Menu item “015 dUS RX LVL.”
Transmitting the Recorded Message
1. Select the LSB, USB, AM, or FM mode using the front
panel [MODE] buttons.
2. Press the front panel’s [BK-IN] button.
3. Press the [F1(CH-1)] ~ [F4(CH-4)] button, depending on which memory register’s message you wish to
transmit. If you hit the key again during playback, the
message will be terminated.
ADVIC E:
You may adjust the transmit (audio) level of the recording
via Menu item “016 dUS TX LVL.”
)
[
MOX] Button
[F1(
[
BK-IN] Button
[F5(
MEM)] Button
CH-1)] ~ [F4(CH-4)] Button
Page 76 FT-2000D OPERATING MANUAL
TRANSMITTER CONVENIENCE FEATURES
VOICE MEMORY
(
SSB/AM/FM MODES
)
Voice Memory Operation from the optional FH-2 Remote Control Keypad
You may also utilize the Voice Memory capability of the FT-2000D from the optional FH-2 Remote Control Keypad
which plugs into the rear panel’s REM jack.
When using the FH-2 Remote Control Keypad, you may record five memories with up to 20 seconds of voice audio each.
Recording Your Own Voice in Memory
1. Select the LSB, USB, AM, or FM mode using the front
panel [MODE] selector buttons.
2. Press the [MEM] key on the FH-2.
LOCK
OFFON
3. Press any of the FH-2’s keys numbered [1] through
[5]
to select that memory storage register. If you do
not press the PTT key (see next step) within five seconds, the memory storage process will be cancelled.
Checking Your Recording
1. Be sure that the front panel [MOX] button is “Off”
(the LED imbedded in the button must be off).
2. Press the FH-2’s [1] ~ [5] key (whichever one you just
recorded in), and you will hear the contents of the voice
memory you just recorded.
LOCK
OFFON
ADVIC E:
You may adjust the playback level of the recording via
Menu item “015 dUS RX LVL.”
LOCK
OFFON
4. Press the microphone’s PTT switch momentarily, the
“ ” icon will glow steadily, and recording will
begin.
5. Speak into the microphone in a normal voice level to
record the message (such as “CQ DX, CQ DX, this is
W 6 Delta X-Ray Charlie, W 6 Delta X-Ray Charlie,
Over”). Remember that the time limit for recording
any message is 20 seconds.
6. Press the FH-2’s [MEM] key to terminate the message
storage process.
LOCK
OFFON
Transmitting the Recorded Message
1. Select the LSB, USB, AM, or FM mode using the front
panel [MODE] selector buttons.
2. Press the front panel’s [BK-IN] button.
3. Press the FH-2’s [1] ~ [5] key, depending on which
memory register’s message you wish to transmit. If you
hit the key again during playback, the message will be
terminated.
LOCK
OFFON
ADVIC E:
You may adjust the transmit (audio) level of the recording
via Menu item “016 dUS TX LVL.”
Page 77FT-2000D OPERATING MANUAL
TRANSMITTER CONVENIENCE FEATURES
VOX
Instead of using the microphone’s PTT switch or the front panel [MOX] switch to activate the transmitter, the VOX (Voice
Operated TX/RX Control) system provides hands-free, automatic activation of the transmitter, based on voice input into
the microphone. Setup of the VOX system takes only a few seconds.
1. To start, set the [VOX] and [DELAY] knobs fully
counter-clockwise (to the left).
2. Press the [VOX] button to engage VOX operation.
3. Speak into the microphone in a normal voice level,
and rotate the [VOX] knob clockwise (to the right) until
the point where your voice input activates the transmitter.
ADVICE :
Do not advance the setting of the [VOX] knob too
much, because to do so will make the transmitter respond to minor background noises in your station.
4. Now stop speaking, and note the amount of time it takes
for the receiver to recover. If the hang time is too long
or too short; rotate the [DELAY] knob, while speaking
briefly into the microphone and then pausing, so as to
set the desired hang time. Clockwise rotation of the
[
DELAY] control will increase the hang time.
5. To exit from VOX operation, press the [VOX] button
once more. We recommend doing this if you are going
to leave your station, to prevent inadvertent activation
of the VOX system by a ringing nearby telephone,
speaker audio from a TV, etc.
(
AUTOMATIC TX/RX SWITCHING USING VOICE CONTROL: SSB/AM/FM MODES
[
VOX] Button
[
VOX] Knob
[
DELAY] Knob
ADVIC E:
The Anti-Trip setting sets the negative feedback of re-
ceiver audio to the microphone, to prevent receiver
audio from activating the transmitter (via the microphone) can be adjusts via Menu item “040 GEnE
ANTIVOX.”
VOX operation may be engaged on either Voice modes
(SSB/AM/FM) and on AFSK-based Data modes. Use
Menu item “137 tGEn VOX SEL” (the selections are
“niC (MIC)” and “dAtA (DATA)”).
)
MONITOR
You may listen to the quality of your transmitted signal using the Monitor feature.
1. Press the [MONI] button. The “ ” icon will appear in the display, indicating that the Monitor is turned
on.
2. During transmission, rotate the [MONI] knob to adjust the audio level from the Monitor. Clockwise rotation of this knob will increase the volume level.
3. To switch the Monitor off again, press the [MONI
button once more. The “ ” icon will turn off, confirming that the Monitor is now disengaged.
ADVICE :
If you are using the speaker for monitoring, instead of
headphones, excessive advancement of the [MONI
knob can cause feedback to occur. Additionally, this
feedback can cause the VOX system to hang up in a
loop, making it impossible to return to receive. Therefore, we recommend the use of headphones, if at all
possible, or the minimum usable setting of the [MONI
knob, if the speaker must be used.
Because the Monitor feature utilizes a sampling of the
transmitter’s IF signal, it can be very useful for checking the adjustment of the Speech Processor or Parametric Equalizer on SSB, and for checking the general
signal quality on AM and FM.
(
SSB/AM/FM MODES
[
MONI] Button
]
[
MONI] Knob
]
]
)
Page 78 FT-2000D OPERATING MANUAL
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