Spectrum DSP M2 Manuel utilisateur
Spectrum DSP M2 User Manual V1.1
►Spectrum DSP M2 User Manual◄
C. Turner, KA7OEI ▲ R. Colclough GW8RDI
September 0 3
DRAFT FIRST RELEASE
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Copyright (additions and logos) 2022-2023 QuantumSDR™ Group
All rights r s rv d
Spectrum DSP M2 User Manual V1.1
Intro uction:
The Quantum SDR project was formed to develop an affordable wide-band spectrum scope with waterfall that
can be easily connected to any radio receiver or transceiver, incorporating the latest SDR technologies, including
machine learning and artificial intelligence, dramatically improving access to the Spectrum for any radio system.
The team's aim is to continue enhancing the Spectrum software, and to develop a variety of new models,
following the feedback we receive from users. You can contact us at [email protected] or through our
Facebook group, QuantumSDR.
Thank you for your support.
The Spectrum DSP M incorporates the GUI (graphics user interface) originally developed by the Universal
HAM SDR (Software Defined Radio) project and extended by Quantum SDR. It is reproduced here with their
permission and our thanks.
Configuration: Touch interface an Transceiver/Receiver association
The Spectrum DSP arrives configured for the transceiver requested during ordering. There are two items that
you may want to configure, one is the touch interface so that so that clicks and swipes align with the on-screen
areas and buttons.
To realign the touch screen interface, reboot the Spectrum, and immediately that a small blue square shows,
press the stylus on the screen and keep pressed. The TOUCH LINE TO RESET SETTINGS message should be
displayed, move the stylus through that line. The touch calibration procedure should then start, else reboot and
try again. Follow the on-screen instructions, finalizing by drawing through the green square, or if you want to
repeat the calibration, through the red square.
If you press too soon after booting, the unit will perform a FACTORY RESET, following which you can reboot and
calibrate the touch screen if needed.
Once set-up, click MENU and make a long-press on EXIT/* to save the new settings.
The other setting is to associate the transceiver or radio with which the Spectrum must connect via the CAT
connection. This can be set by clicking the MENU button, then when the menu is displayed, make a short down-
swipe in the middle-right of the LCD until Configuration Menu is reached, then another down-swipe on the right-
side of the screen to open that menu. You can then select the associated transceiver and Spectrum mode, such
as BiSync, slave or master.
NOTE YouTube instruction video
The LCD requires a light yet firm touch. Long-presses are activate when the stylus stays in contact over 0.6
seconds.
There is a video in our YouTube page where you can see how this is performed:
https://youtu.be/A_YlSJJQLGM?si=aTvMzkuZGbk8A-Cz
What radios can the Spectrum be used with?
The Spectrum DSP can connect to any radio system that has either an IQ port, IQ point on it's PCB (such as the
Electaft KX , uSDX (tr)usdx and newer QRP Labs radios), or a connection to the IF stage output (model M3 or
higher).
If you need support connecting your radio, please contact us.
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Spectrum DSP M2 User Manual V1.1
Typical installations
Concept – Xiegu G90 to wide DSP
The Xiegu G90 is an excellent and
feature-packed HF transceiver that's
key limitation is it's small display. By
the addition of the Spectrum DSP that
small display is converted into the
Zoom window, showing a close up of
the stations nearest to tune frequency.
Perfectly synchronized via the CAT
connection, the Spectrum DSP
becomes part of the station to provide
not only a wide-band spectrum window
that's zoomable from 3 to 19 Khz, but
also an independent 19 Khz tuning
window, where with the drag of the
stylus, you can instantly listen to
stations without having to spin the dial.
When you find the station you want,
one click is all it takes to synchronize
the G90. DSP noise & notch filtering are
also provided.
This combination results in a better
option that upgrading to many of the
newer DSP transceivers with larger
screens that often lack items such as
the ATU and full 0W output.
Concept – Elecraft KX3 and KX to wide DSP
The classic Elecraft KX and KX3, with it's beautiful smooth turning dial, synchronizes
perfectly to the Spectrum DSP, providing an independent 19 Khz of instant tuning across the
band with the stylus or a light touch on the screen. When you find the station that you want,
one click synchronizes the Elecraft ready for operation. The Spectrum allows you to view the
whole band, zooming from 3 right out to 19 KHz, and providing bidirectional tuning
synchronization for the fastest access to stations across the bands.
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Spectrum DSP M2 User Manual V1.1
Concept – Classic to wide DSP
The Spectrum DSP can also connect to the IF signal of any classic radio, allowing those
beautiful sets to be used with the very latest features like any modern transceiver.
The connection to the IF of most receivers requires a simple miniature coax cable connection
direct to the IQ input on the Spectrum. Connection notes are available for several models of
radios.
If you require any help connecting your radio, please get in contact.
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Spectrum DSP M2 User Manual V1.1
Graphical user-interface (GUI):
Note: All references to TX operation are inclu e for the future inclusion of a TXRX mo ule which
converts the Spectrum into a DSP transceiver.
The touch screen is easily controlled once the basic technique is mastered.
Clicks with the stylus should be made in a deliberate manner, approximately half a second
long will activate the menu and control buttons, any longer and they will be detected as a
long-press, which activates secondary functions which most buttons and touch areas posses.
You can practice this by clicking on the MENU button. A short but deliberate press will display
the menu list, a long-press will mute the audio, making another long-press will reactivate the
audio. If the volume is too low, click DSP/OFF and stroke up on the left-side.
A video on YouTube is available showing how to use the touch interface, available here,
https://youtu.be/A_YlSJJQLGM?si=0QFNF63dCD417fZ8
GUI controls are software defined, but for the purpose of simplicity they are typically defined
as follows:
•Power on/off – Tapping the LCD screen several
times wakes the unit from power-save mode. To
power-off, press Menu then click PWR and
immediately Confirm.
•Ban change – To change band click the highest part
of the frequency display, which will then display the
band keypad. You can also change band by clicking
the red or green lines to the right-side of the frequency display.
•Display Mo e – The display modes are toggled by clicking on the top of the Spectrum
display area. If they gray header bar is shown, click on the left of the bar to toggle
through the modes.
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Important: SDR Offset
For best receive quality the
frequency offset mode should
be activated with a long-press
on the TUNE/O button. When
this button is green, the offset
is activate.
Figure 2: Main touch display of the Spectrum DSP
Spectrum DSP M2 User Manual V1.1
•Tuning – The Spectrum must be in Master, BiSync or Slip-Tune modes to enable
tuning, else tuning is controlled from the attached transceiver when connect via CAT.
Click MENU then select Configuration Menu to change mode.
Tuning can be accomplished by clicking anywhere on the Spectrum band. To fine tune
touch the centre of the spectrum display keeping the stylus down and drag left or right.
Enabling SNAP/Bl with a single click will increase the speed of frequency change
through dragging. Fine tuning can be made with the two buttons << >> a single press
shifts the frequency 1KHz, a continuous press will continually bump the frequency by
100Hz. You can also click the right-most digits of the main frequency display to
alternate between a 0 hertz offset, and 500 hertz, common channel steppings.
•Slip-tune – Click the SLIP/SP button once to enter and leave slip-tune mode. When
activated the text will show green. When activated you can independently tuning by
dragging the blue tune bar across the spectrum. The transceiver does not change
frequency and the audio from the Spectrum will be heard and the frequency shown.
Click SLIP/SP again will then synchronize the transceiver to the Spectrum frequency.
A video on YouTube here explains the procedure: https://youtu.be/8nApkXsXI7A?
si=YmrLRjyOvIi7Z6jf
A vi eo on YouTube shows how to use the Slip-tune mode here.
Slip-tune allows complete tuning free om over 19 Khz without re-tuning the TX/RX
•Dial-tune – Click the TUNE/O button bottom-right to display the virtual dial. Tune by
drawing a circle with the stylus CW or CCW. To tune faster, make a long-press on the
buttom button marked VFO A (or B), when this is shown red fast tuning mode is
activated. The tuning is very accurate, and makes it easy to fine tune.
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Spectrum DSP M2 User Manual V1.1
Figure 3: Virtual dial: The Spectrum after clicking the TUNE/O button.
•Volume – Click the DSP button centre-left then stroke up and down on the left-side of
the LCD screen.
•AFG – Click the DSP button centre-left then stroke up and down in the middle of the
display to adjust. Click the AGC box to change to BAS, TRB (treble) or AGC speed
(SLO etc), then stroke up and down in the middle of the LCD to adjust.
•RIT – Click the DSP button centre-left then stroke up and down on the right-side of the
screen to adjust RIT (Receiver Incremental Tuning), note that its function may be
changed by clicking the RIT box to adjust the sending speed (in Words Per Minute) in
the CW mode, or to adjust the Microphone or Line-In gain in voice mode, etc.
•Mo e – Click the mode box in the center of the LCD to select the operating mode of
the transceiver (CW, USB, LSB, etc.) Clicking this button cycles through the available
modes. Click the button above to select digital modes, such as BPSDK and RTTY.
When “LSB/USB Auto Select” is enabled in the Standard Menu (click MENU to
access), the sideband that is not appropriate for the frequency of operation (e.g. USB
will not be selected below 10 MHz). When menu item “LSB/USB Auto Select” is
enabled, in order to change to AM you must select a mode other than LSB (or USB) –
such as CW – and then press-and-hold the Mode box - AM will then be selected.
•DSP – This button is used to control the DSP audio filter mode. When the DSP keypa
is displayed, pressing-and-holding will turn DSP on/off while preserving the current
settings. A long-click on the DSP mode will also disable it until long-pressed again.
•Filter button – (Middle-left) This button is used to select the audio passband filter of
the receiver. The button cycles through the filter that have been pre-selected in the
Filter Selection menu. The button is disabled when FM mode is selected, but
pressing-and-holding it while transmitting on FM will cause a tone burst to be
generated, if this feature is enabled. Pressing-and-holding this button will force the
selection of bandwidth that are otherwise disabled.
The row of virtual buttons at the bottom of the LCD screen are “soft” buttons, the functions of
which change depending on mode, as indicated on the LCD, and will be discussed in more
detail later in this document.
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Spectrum DSP M2 User Manual V1.1
Main LCD Touch isplay
On the main display, just above the Spectrum Scope, there are a number of indicators:
•Main Frequency Display: This may be displayed either as a single frequency
(transmit/receive as in Figure 4) or as a “Split display showing both frequencies with
separate transmit and receive frequencies. If the numbers in this display are grey the
“Frequency Lock” (configured in the menu) is active. If this display is yellow, a
transverter offset has been configured.
•RIT+Tuning Display: Above and to the right of the main frequency display is a smaller
display that is offset from the main display if the RIT is set to something other than
zero.
•Ban Display: To the right of the main frequency display is an indicator of the
amateur band in which the current frequency is tuned with click areas underlined in red
and green to increment or decrement the band. If the current frequency is outside an
amateur band it will display “Gen” (e.g. “General Coverage”), depending on
configuration settings.
•Mo e In icator: Above the MHz digits of the main frequency display is the current
demodulation mode displayed on a blue background.
•Zones: These three zones are controlled via clicking the top box to toggle through the
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Figure 4: The main screen (annotated) with the SPLIT function disactivated.
Wh n “Fr qu ncy Translat ” mod is on, th c nt r fr qu ncy indicator will b
shift d right of c nt r by 12 kHz to r duc th SDR nois l v l n ar DC z ro.
Spectrum DSP M2 User Manual V1.1
controls for each zone, and then swiping up and down in the three LCD screen
regions, left-side, middle, right-side. Click the DSP button to enable access, and then
swipe in the regions outside of the DSP virtual keypad that is displayed.
Along the top there are a number of additional indicators:
•Time & Date: This can be set by clicking MENU, then opening the configuration menu.
Please refer to the instructions on page 5, and the linked instruction video.
•S-Meter: This S-meter is nominally calibrated so that S-9 equals 50 microvolts into a
50 ohm load with each S-unit representing 6 dB. Practically speaking, the usable
range of the S-meter ranges from about S-3 to something a bit higher than “40 over”
which, if you were “run the numbers” about matches the dynamic range of the receiver!
The bottom half of the S-Meter's graticule (“S0-S9”) is normally white in color, but if the
receiver's A/D converter experiences an overload condition, it will turn red. On bands
with strong signals it is normal for this to momentarily flash red as the internal gain
control adjusts itself. In Figures 2 an 3 the S-meter is displaying a signal level of S-
9.
•PO: The S-Meter scale, when in transmit mode, also indicates the output power from
the transmitter.
•Multi-function isplay: Below the S-Meter and Power Output meter is a multi-
function meter that, by clicking, may be used to select one of three modes: SWR,
AUDIO, and ALC.
•SWR: When in transmit mode, this meter indicates the calculated VSWR. Note
that the VSWR is calculated only when the forward power exceeds 0.25 watts.
When in SSB mode, this indicator will not show any VSWR indication
unless/until there has been some RF power that exceeds the minimum power,
allowing a calculation to be made.
•AUDIO: This indicates, in dB, the relative audio level being applied to the
MIC/Line input.
•ALC: This indicates, in dB, the amount of gain reduction that the ALC is
applying while in transmit mode. 3-1 dB of indication during typical speech is
normal.
•VCC: Below the Signal meter is a voltmeter that indicates the current supply voltage.
Below 4.40 volts, the digits are displayed in red, orange below 4. 0 volts and yellow
below 4.00 volts. The receiver may function as low as 3.3 volts.
•TRACE: To the right of the Mode button. Clicking trace will enable or disable the trace
outline shown on the scope display.
•Freq. Step [<< >>]: Just below the DSP button, and slightly to the right. If clicked
once the frequency will step + or – 1KHz. A long press will keep stepping the
frequency in 100Hz increments, ideal for fine tuning. Clicking the lower 3 digits of the
main frequency display will set the frequency to 0 Khz or 0.5 Khz.
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Spectrum DSP M2 User Manual V1.1
•DSP Setting: Middle far left is the indicator of the DSP mode button. The modes
available are: ”OFF”, “NR” (Noise Reduction), “NOTCH”, and “NR+NOT” (Noise
Reduction and Notch). Trace may be automatically disabled in the CPU overloads.
Spectrum isplay:
Below the frequency readout, shown in Figure 2 and Figure 3 is a spectrum display that
shows signals that are on either side of the current tuned frequency. Along the bottom of the
spectrum display is a frequency scale that shows the frequency scaling of the graticules
rounded to the nearest kHz.
This display works very much like a spectrum analyzer with the vertical scale being
represented logarithmically, the number of dB/division being selectable by the user. To further
the analogy to a spectrum analyzer, the “reference level” (the signal level at which a particular
strength is indicated) is automatically adjusted via an AGC (Automatic Gain Control) within the
spectrum scope that operates independently from the receiver's AGC that automatically
scales the strongest signal within the passband such that it is at/near the top of the scope –
this, to allow the representation of widely varying signals on different bands without the need
of user adjustment.
Waterfall isplay
Figure 4 shows an alternate
method of displaying signals
near the currently-tuned
receiver signal is the Waterfall
Display. In this mode, the
frequency is displayed along
the “X” (horizontal) axis, just as
in the case of the Spectrum
Scope but instead of the signal
strength being displayed as
height, it is displayed as relative
“brightness”. The waterfall
displayed is so-called because
it can convey the history of
recent signal in time by showing
the most recent signals at the
bottom, but when new signals
are analyzed, the older signals are displaced vertically and the newest signals are placed
along the bottom. In this way, one has a quick visual “history” of what has occurred not only
on the center frequency.
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Figure 4: A typical waterfall display in "Magnify" mode showing
+/- 12 Hz (24 Hz) of a band segment. When NOT in magnify
mode the waterfall will show +/-24 Hz (48 Hz) of a band.
Figure 4: The waterfall display unzoomed showing +/- 96 kHz (192 kHz)
of a band segment. Zoom mode allows 96 to 3 Khz to be viewed.
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