Spectrum DSP M2 Manuale utente

Spectrum DSP M2 User Manual V1.1

►Spectrum DSP M2 User Manual◄

C. Turner, KA7OEI ▲ R. Colclough GW8RDI

September 0 3

DRAFT FIRST RELEASE

P 1

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-

•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.

P 10

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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