User Guide
Contents
1. s pr a necessary ee Ln 1 F i d e o Q a ri e I e e P Mu d e e d e hy a de ae selector 3 T H S B bd a 1 E Figure 5 A Max patch User Interface The radio interface is designed to fit a small screen while still providing access to the underlying processing blocks Like most SDR applications the goal is to make it look and feel like a hardware radio In addition to the standard Max user interface UI objects the receiver supports remote operation via Midi and the iPad running touchOSC Max has an extensive library of MIDI interface objects This makes it possible to use control surface hardware with real knobs and buttons to operate the radio A complete MIDI specification is included in the appendix It has been tested with the Behringer BCR2000 but any programmable Midi device can be used to control and receive feedback from the radio Figure 6 BCR2000 Midi control surface Remote iPad operation is accomplished using the touchOSC and Airphones apps touchOSC sends and receives data using the Open Sound Control OSC protocol Here are examples of the iPad radio screens Figure 7 iPad radio screen 9 681519 10 1 2011 AM music a cosine cosine cosine high OUOJOVYOLO modulator2 Julator3 modulator5 mainTuning Figure 9 iPad synthesizer screen touchOSC communicates with Max via Wifi Max sends audio back to the iPad vi2. Software Defined Radio in Max MSP A software defined radio receiver Works with the Soft66lc2 500 KHz to 30 MHz and the FUNCubeDongle Pro 64 MHz to 1 7 GHz Features include Support for generic IQ devices and files SSB AM FM and FMW AGC Notch Peak filter and Noise filters Midi control surface support iPad control surface support via touchOSC Memory store recall Scanner interface Synthesizer interface Runs in Mac OS and Windows Requires Max MSP 5 distributed by Cycling74 iPad screens require touchOSC app For downloads support and tutorials http zerokidz com radio main tuning device status SR tuning step mhz device freq mhz actual freq mhz offset khz Ly lt master reset p midi_control g p midi_fb PAA p filter_ settings Ks Merc punt p touchOS u ar af gain zu gi Sane BE TD Ci a Lo 7 aoc 6 p mixer AGC Ena pole 600 6000 noise filter a p scanner ud dhol s Se gen p clock t dL test eq CE Gp mn th an os TA O ovens era part E Go oas TON peak E notchipeak fiter 7 aan PLEDpane Y double click for settings audio 192 168 1 103 ono Y wan EE Pal pam audioSettings cvor osc hum filter Figure 1 A software defined radio receiver in Max MSP Credits This project is derived from the work of the following developers Kazunori Miura JA7TDO Soft66lc2 hardware software design Thomas Horsten Linux soft66add control softw
3. The site provides valuable insights into SDR Its very existence led me to believe this project was possible Antennas The ARRL provides a comprehensive bibliography of articles related to antennas http www arrl org antennas Complex numbers and modulation Katja Vetter has published a remarkable site exploring sinusoids complex numbers and modulation with numerous examples in Max and PureData Here is the home page http www katjaas nl home home html anchor2 A discussion of quadrature mixing http www katjaas nl quadmixing quadmixing html CuteSDR An open source multiplatform Qt based SDR by Moe Wheatley AE4JY The Technical manual is an excellent resource for developers http sourceforge net projects cutesdr files doc CuteSDR 100 pdf download Source code is available here http www rfspace com RFSPACE CuteSDR html Digital signal processing A great resource for learning about DSP is Steven Smith s online book The Scientist and Engineer s Guide to Digital Signal Processing It s a free download http www dspguide com pdfbook htm FUNCube The FUNCube Dongle Pro http www funcubedongle com GNURadio companion This site by Alex Csete OZ9AEC provides links to experiments with GNURadio Companion an open source radio development platform which is part of the GNURadio project Alex is the developer of QtHID a control program for the FUNCube http www oz9aec net IQ
4. data files Most of the example IQ data files used in this project came from here http www rfspace com RESPACE Support html PebbleSDR An open source SDR featuring easy to read C source code The code is well commented with references to underlying algorithms http sites google com site pebblesdr Soft66lc2 Here is a link to information about the Soft66lc2 device used in this project http zao jp radio soft66ad Software defined radio The ARRL provides a comprehensive bibliography of articles related to SDR http www arrl org software defined radio
5. simplifies frequency shifting and demodulation 2cos MQ n lax n x n QS a 2sin MQ n lowpass filter Figure 2 IQ modulator The computer reads baseband IQ signals via the sound card and converts them to digital data ADC The rest of the processing happens in software This includes mixing filtering and demodulation The final result is converted to analog audio by the sound card DAC Typically an SDR program also sets device frequency and selects appropriate hardware filters via a serial USB interface The RF front end devices used in this project were selected based on cost and frequency coverage The Soft66LC2 designed by Kazunori Miura JA7TDO costs 108 USD and covers 500 KHz to 30 MHz Figure 3 The Soft66lc2 The FUNcubeDongle Pro FUNCube designed by Howard Long G6LVB costs 186 USD and covers 64 MHz to 1700 MHz Figure 4 The FUNCubeDongle Pro This project was developed in Max MSP 5 Max from Cycling74 on an Apple Macbook OS 10 6 Max provides a wealth of audio DSP objects which are easily adapted to the signal processing requirements of SDR Max external objects for device control are written in C They are compiled using Xcode 4 for the Mac and Visual Studio C Express for Windows 5 detector unlocked joj x File Edit View Object Arrange Options Debug Extras Window Help io signal input fm output scale 0 1 KS slide e not sure if this gt x e subtraction is
6. slider to lessen its effect If you double click on the AGC object box you can change the AGC response speed by adjusting the attack and release sliders Scanner Double click the scanner subpatch to access the control screen is en results for use current ISM use current hour al er X p input_menu_clone S useCurrentismSend s useCunrentlimesend idefaultAudioln ii device index tb il rhourOffheTime S useSearchSend fade b22 time 22 g gate gate autopattr lucy slot Sn 2 input selection menu in searc results now defaults bane g to reset BER playing pobla scanner n pis modon T do ISM match P init_scanner scan Bt J do time match sario GE ___ r preseNmberSend patcher findthings rrecall_Z P get_slot_info s pingOSCScanner rhitCount Il actual slotnumber to gq 577 p scan recall T Zi srecall_Z s slot Z pak pstoragePresetNumber O shiCount Naan hit count 2011 113 JL makebat 7 tbi Eo pee pak petorageRecallButton O Srecall_Z S slot Z pattrhub patcher parent Figure 24 scanner patch defaultAudiolnput bang The scanner uses memory presets see above Save some presets if you haven t already before proceeding further Note currently the iPad scanner screen is a better user interface for scanning The scanner uses a search engine that allows selection by device ISM and clock time hour Set the toggle buttons and numbe r boxes to re
7. the edges amplitude varies proportionally to frequency modulation Zap high pitched carriers using the notch filters Any of the fixed filter settings in the detectors for example can be changed by editing the patches If you think you ve have messed up critical settings just reselect the mode Or try shutting off notch hum and noise filters Or press the master reset button If all else fails restart the program If the main tuning slider is at the very center of the bandscope you will sometimes hear a low level carrier signal caused by distortion in the mixer or outside interference If this is a problem set the device frequency above or below the target and move the main tuning slider off center For example to tune 10 0 MHz try entering a device frequency of 10 01 Keep an eye on the input RF gain level Keep it under 0 db to minimize distortion Use the preamp buttons and RF gain slider to make adjustments If you re hearing way too much noise especially with the Soft66lc2 try disconnecting nonessential USB devices like external hard drives Midi controllers and other radios I have not had any success using outboard USB audio devices with the Soft66lc2 It seems to be easily susceptible to radio interference from other USB devices I have used MOTU firewire audio devices and they sound great AGC AGC should generally be left on although you may get a cleaner FM sound by shutting it off You can decrease the threshold
8. touchOSC communicates with Max via Wifi You will need to know the IP address of the computer running Max host and enter it into the network configuration settings of touchOSC on the iPad Conversely Max needs to know the IP address of the iPad Type the IP address of your iPad into the blue textedit object labeled touchOSC IP in the lower right corner of the main screen Then press lt enter gt 192 168 1 103 touchOSC IP Your IP address setting will be saved and recalled the next time you run the program Port Settings The default port settings are e Receive data from touchOSC 7400 e Send data to touchOSC 7402 touch_osc_config txt Settings for the IP address and ports are saved in touch_osc_config txt If for some reason you need to change the default ports you can edit this file in a text editor Using the iPad interface Once the network settings are complete Max will detect your iPad when you select one of the radio screens and touch a control If the radio is running you should see activity on the RF and AF gain meters and the bandscope To select an iPad screen touch the screen select tab bars at the top of the screen The available screens are 1 radio standard 2 scanner 3 radio alternate 4 synthesizer The mapping files for the touchOSC controls are maxsdr_note_osc txt maxsdr_cc_osc txt For more details look at the touchOSC and touchOSC_fb sub patches Synthesizer interface
9. 96 KHz Mode select control Currently available modes include SSB AM FM and FMW wideband Mode choice affects filter selection and demodulation Mixer iQmixer frequency shifter Palo aie Mix frequency Gs Msc El SR 2 to SR 2 p cosc complex oscillator TE p cmul Si complex multiply F H 4 o sig o sig Q Figure 11 mixer The mixer is a software version of the LO mixer found in the RF front end It shifts the center frequency within the passband by complex multiplying the IQ signal with the output of a variable complex oscillator having a frequency range of SR 2 complex oscillator ED freq 2 fevel 0 1 0 loadbang T E a real 8 imag Figure 12 variable mix oscillator Tuning within the passband is done by varying the frequency of the mix oscillator Lowpass filter Following the mixer stage the bandwidth is narrowed from the width of the entire passband to the minimum bandwidth necessary to convey all of the information in a given signal For example single sideband SSB audio generally has a bandwidth lt 3000 Hz The choice of mode determines filter width You can adjust the filter while listening to reduce interference narrower or increase fidelity wider sig i sig Q center gain a i TowPassFiltter l reduce bandwidth to improve 8000 selectivity unes bo he I D 12 6 4 12 18 l eT gt biqu
10. Radiogroup 0 3 0 15 noiseFilterLevelSlider 0 64 0 16 notchFilterlFregSlider 6000 0 17 notchFilterlWidthSlider 0 5 0 18 tuningStepNumber 8 0 0 19 deviceFregEncoder 0 L Es 20 preampRadiogroup 7 0 0 21 scopeRangeSlider 0 25 0 22 noiseFilter2LevelSlider 0 64 0 237 pstoragePresetNumber 0 127 0 The default Midi devices are set using menus in the midi_control and midi_fb sub patches For now we recommend programming your Midi device to use the data in the text files rather than changing the text files to match your device This is because the Midi feedback to the device is hardwired in midi_fb using Max send s Midi feedback If your control surface accepts feedback the radio will send the Max UI data back to the same note and CC numbers specified above touchOSC iPad Interface One of the coolest aspects of this receiver is the iPad control surface There are two radio screens a scanner screen and a synthesizer screen Example screenshots can be found earlier in this document You will need to install the touchOSC app on the iPad available from iTunes App Store Install the touchOSC editor available from http hexler net software touchosc on your computer The radio screen file is located in the OSC folder of the Max radio file folder The current filename is radio20 touchosc Follow the instructions on the touchOSC website to download the radio screen to the iPad IP address settings
11. Unless you are running the standalone Mac Os version you will need to install Max MSP on your computer before you can run the program Either the full version or the free runtime version will work You can download Max MSP from Cycling74 Sliders buttons and toggles AGC cot i ec EEE Figure 16 Max toggle and slider objects Most of the user interface objects are sliders and toggles To operate a slider click and drag Toggles are square buttons that show color other than gray when they are on Click a toggle to turn it on or off Audio MIDI setup To change audio settings double click the green audioSettings object in the lower right area of the screen next to the audio on off toggle double click for settings Figure 17 audio settings object The Audio Settings window will appear When you have finished making changes close the window Any changes will automatically be saved DSP Status Audio Figure 18 audio settings window If you are running the full version of Max you can also set audio preferences with the Max menu item Options Audio Status DSP status in Max5 If you are using the Soft66lc make sure you have selected the line in port on the soundcard as the Max input device The recommended sample rate setting is 96 KHz or the highest value your soundcard supports If you select a value that doesn t work try reducing it If you are using the FUNCube make sure it is selected as
12. You can operate the radio with a modular synthesizer interface rn6 rn res Counter 4 5g e6 re Isro mG ed A ace E pos BB Do 2 Le O ep gt O l s05 O rms2 so s07 O 808 a ras O 5 nos Ines no nos Figure 27 synthesizer module For example you can modulate the main tuning slider with a sine wave There are five modulator modules which modulate each other too Open the synth sub patch or use the synthesizer screen on the iPad to get started For more information check http zerokidz com radio for an instructional video led display screen Figure 28 led s If you are using a control surface you may be interested to check out the alternative led display screen Open the LEDpanel sub patch and click the large toggle button to start the program For more information check http zerokidz com radio for an instructional video What s Next We welcome your ideas Here s what s currently on our list Native cross platform support for more radios TV and digital modes Adaptive filtering based on content Transmitting Spectrum analysis Communication with animals If you have ideas or suggestions please contact me at radio zerokidz com Figure 29 mind control References Deserving special mention is the anonymous author of this link http www geocities jp e_karakuri sdr contents html Japanese It describes a software defined radio in PureData similar to Max
13. a Wifi using the Airphones App This allows the iPad to be used as a self contained remote receiver using the laptop as a server for the radio hardware An alternative user interface display using Max led objects is shown below p panelControl expander EtchASketch O wiring patcher connectblobs Figure 10 led display screen Software Design Max uses a visual design paradigm featuring object boxes and patch cords A Max patch looks a lot like a circuit schematic diagram Processing blocks can be encapsulated into sub patches simplifying the top level view Source code In Max the visual representation of a patch is equivalent to source code Links to files for this project are at http zerokidz com radio You can view code within a Max sub patch by double clicking its object box Source code for Max external device control objects is written in C and compiled in Xcode This code will be available from the same site If you don t have a full copy of Max you can still run and view max patches using the Max runtime program a free download from Cycling74 In this text Max objects are referenced in square brackets For example adc For each of the following sections please refer to appropriately named sub patches in the source code for precise detail Software Signal Path Here s a block diagram of the signal path There is no right way to arrange the blocks IQ control preamp attenu
14. ad biquad o bandwidth r o a Figure 13 Lowpass filter Modern receiver designs usually employ filters at several stages For example roofing filters at the front end bandpass filters at conversion stages and various audio and noise reduction filters after demodulation AGC The automatic gain control AGC is an audio compressor It makes quiet signals louder and loud signals quieter Placing AGC after the bandpass filter makes it less susceptible to strong signal interference in the passband It also presents a constant signal level to the detector Detector demodulator The detector extracts audio information from the baseband signal SSB requires no demodulation when using IQ signals For amplitude modulation AM and frequency modulation FM the IQ signal is converted to polar form Vector length a is amplitude The angle theta is phase With AM the amplitude is the audio information 1Q AM Detector i sig sio Qa ll ji cartopol o amplitude Figure 14 AM detector In FM the audio information is the amplitude of the phase difference from one sample to the next This type of FM detector is called a differentiator ENDS 3 Ej A based on Eric Blossom i http fwww linuxjoumal com article 7505 iQ signal input delay 32 1 pcmul complex multiply by complex conjugate of previous sample atan2 phase angle 1 0 5 DC offset correction e audio out Figure 15 FM
15. are Thomas Robin Couerrier PPC externals conversion amp testing Howard Long G6LVB FUNCube hardware software design Alexandru Csete OZ9AEC QTHid FUNCube control software Mario Lorenz DLSMLO FUNCube control software David Pello EA1IDZ Linux FUNCube command line control software Joseph Zicarelli KB1URI Project design and testing Thank you Tom Zicarelli KA1IS November 19 2011 Table of Contents Software Defined Radio in Max MSP sica iia 1 Aa E SA EAA AEAEE E a 2 System DESIN ae re 5 a chai elie tac A 7 SOLAS DESTA A A rim 11 SOllw are Desien u A E 11 IMEI SN A runs 11 Software SP ta 12 AUS PUE MED da 12 DVI MS re sn 12 VO A a Vis 13 TO Dala ii a adi 13 preanip attenuaton RP gain control aa ae 13 Bandscope and tuning controls a ta 13 M des lect Controlere ee A a 13 SA a ee ee een 14 POW PASS Her nee Eier 14 Male a Di dd ndo o dl e 15 Detector demolida 15 Audio Notch Peak Dies iia a ee 16 Hom filtere e a A 16 AAA E E E EE E 16 POW PASS la a seine 17 Device AA Dee edel 17 A a A EE 17 FUNCHbe A duda A ia 17 MID Teoria aa 17 User Matta A a EE E E 19 TASA eier 19 Hardware SED decias 19 Cables 2er era 19 PRIMO TITAS are asien dd 20 PRO es is 20 Usine the prostan era dat 20 Sliders buttons and toggles ect ea 20 Audio MIDI setup A ee 21 Basic operalion ae ei 22 O A deln 23 Memory PESCA eh RI aeacsagtt 23 Controlling Device Frequency u dd 24 PS ct 24 Tuning tips and troubleshooting
16. ator flip balancer gain control Ts MIDI controller input Frequency mixer Bandpass gt filter Device control USB Mode select pa gt Audio filters Audio notch peak output SSB AM FM noise etc Prior to demodulation the signal is in IQ format which facilitates frequency shifting and demodulation The IQ signal is called a baseband signal because the carrier frequency has been shifted out by the front end LO mixer effectively moving the radio signal down into the audio spectrum The result of demodulation detection is a standard audio signal Audio Input Menu The audio input menu is a shortcut to selecting the audio signal source For example the FUNCube device has a built in USB audio which appears on the menu as FUNCube Dongle V1 0 Device File Menu The input device file menu selects the current device a radio the default soundcard or an IQ data file IQ data files are useful for testing especially if you don t have a radio or an antenna In Max the sfplay object is set to loop the selected IQ file providing an unending data stream IQ flip Typically T and Q signals are assigned to left and right audio channels respectively On some devices this is reversed IQ flip simply reverses input channel assignments You can tell if polarity is backwards by watching the direction a signal moves on the scope when you change the device
17. d set frequency Filter settings respond to frequency changes FUNCube The FUNCube uses libUSB drivers FUNCube has an extensive API for device control including filtering amplification bootloader mode and frequency control Currently only two functions are supported detect device and set frequency Filter settings respond frequency changes MIDI control Using an optional MIDI control surface lets you control the radio using real knobs and buttons Most of the user interface objects can be controlled with MIDI In general sliders are assigned to MIDI controller messages CC and buttons are assigned to MIDI note on messages Future plans include a MIDI learn mode for simple compatibility with any MIDI device If you have a translator program like MIDI ox or ability to program your control surface you can make it work with this project The MIDI implementation table can be found in the next section User Manual Installation The project is available as a zipped archive file zip Download the latest version of the program from http zerokidz com radio Unzip the downloaded file It will be a folder Feel free to rename the folder to something more convenient For example maxsdr5 In this document we ll call it the maxsdr5 folder The main patch is called maxsdr5c maxpat If you can t find the main patch look for a file with a similar name like maxsdr5e maxpat assuming the patch was upgraded more
18. detector Most modern FM detectors use the amplitude of the error signal from a phase locked loop PLL Filtering is required after the detector to remove spurious artifacts of demodulation Audio Notch Peak filters Adjustable notch filters remove carriers and other frequency specific noise Peak filters emphasize specific frequencies helpful with weak signal reception in CW mode Hum filter The hum filter is a notch filter set to 60 Hz Noise filter The noise filter used in this radio uses logarithmic smoothing algorithm with the Max slide object Lowpass filter A medium Q not too sharp low pass filter LPF is placed at the end of the signal path to act as a tone control Device control The two currently supported devices Soft66lc2 and FUNCube require USB control messages to set frequency and select filters Although the developers supply control software it s more convenient to set the frequency directly from Max It also simplifies the use of MIDI control surfaces Device control requires the use of Max externals user defined objects written in C The current external objects don t run in Windows By the way if anyone wants to send me a radio P11 write a Max object to control it Soft66lc2 The soft66lc2 uses the FDTI USB driver The Max external is essentially a copy of the Visual Basic application supplied by the developer Currently only two functions are supported detect device an
19. frequency IQ balancer Correct balance between TI and Q channels improves image rejection The balancer is an audio panning control Current SDR designs employ adaptive balancing methods to determine levels based on signal content In general it s more effective to achieve correct balancing in the LO mixer circuit of the hardware front end Signals which overload the front end tend to show the worst image rejection False images appear opposite and equidistant from the center frequency preamp attenuator RF gain control Levels of incoming signals vary widely depending on device frequency and signal strength within the passband The preamp is an audio gain control combining presets and a variable level control A predictable signal level at this stage gives better results in the mixer and bandscope The preamp also contains an optional automatic gain control AGC function which is identical to the AGC used just before the detector stage Although AGC at this stage is a convenience it tends to increase noise levels later in the signal path and exhibits pumping from strong signals anywhere in the passband Bandscope and tuning controls The bandscope displays the full IQ signal in the frequency domain using a fast Fourier transform FFT It gives a picture of relative signal amplitudes across the passband which is the width of the sample rate SR For example if SR is 96 KHz the passband and bandscope width is
20. he device frequency control If this happens just click anywhere in the white empty space on the program screen 2 Manual data entry type the frequency in MHz into the data entry number box in the device control panel And press Enter For example type 3 850 to hear the 75 meter phone band 3 Use the coarse fine sliders Note If you are using these sliders with the FUNCube make sure the UHF toggle is on 4 Use an external program to control the device frequency Select defaultAudiolnput from the input select menu Filters The Lowpass filter width gets set automatically by choosing a mode If you hear annoying carriers use the notch filter to eliminate them Hint start with the filter set wide and narrow it after you find the carrier The hum filter banishes low frequency interference The noise filter tackles static and electrical interference Tuning tips and troubleshooting The FM detector is a work in progress If you hear a slowly growing raspy buzzing sound that reappears every minute or two try increasing the Signal vector size in Options DSP Status Try values of 128 256 512 1024 etc until the problem subsides We re actually not sure if this is an issue with the FUNCube or the FM detector If the FM doesn t sound right try re clicking the mode selection button FM or FMW You can actually receive FM using an AM detector by tuning off to one side of the signal This is called edge detection Near
21. ii ada 24 Scannen ee en SR eC 25 Midi Speeinc AMON ua 27 Midi feedba k A ee ee 29 1Pad Interface se er ie ie eg 29 Synthesizer interface se lea Rd 31 led display TE RR des 31 WES ING MEP os ek ca ar ca insted ca EEEE E E 32 References ee ds Sheba cci s 32 ANLENNaS ee kennen 32 Complex numbers and modulation n ene ee aa 33 CULES IR it eier Ehe d nde 33 Digital sisnalprocessie s a en er ass 33 PUNCUbDS 0 ds 33 GNURAdio compati nn ea 34 Oda tildes sinn faire toh betel ual ae ge 34 BG BB Le LR ses en hed LN ei A eh ee et ON ea cece 34 A O a RD eee eT eee OTE ye eee 34 Solar dende be ds CS BE wen 34 System Design In a software defined radio system SDR components traditionally built with hardware are implemented in software using digital signal processing DSP Familiar products like cell phones and wireless routers are examples of SDR s The project described here is a software defined radio receiver with three physical components e Antenna e RF front end e computer Baseband IQ signal to soundcard USB Device control In a direct conversion SDR the RF front end sends input signals through a bandpass filter to a mixer which shifts the frequency down into the audio spectrum The mixer uses two local oscillator LO signals that are 90 degrees out of phase to produce T and Q signals in phase and quadrature IQ signals are also referred to as complex or analytic signals Using IQ signals
22. ipt name e Default toggle setting not used AGCToggle 1 IOoFlipToggle 1 autoLevelToggle 1 deviceTuningArrowKeysToggle 1 deviceTuningUHFToggle 1 fineTuningResetButton 0 humFilterToggle 1 mainTuningResetButton 0 notchFilterlToggle 1 peakToggle 1 noiseFilterTypeToggle 1 testNoiseToggle 1 tuningStepDownButton 0 tuningStepUpButton 0 freqChangeDownButton 0 freqChangeUpButton 0 pstorageStoreNextButton 0 pstorageRecallButton 0 pstorageMasterResetButton 0 pstorageSaveButton 0 PN NONON OF Na 0YNRADNOOS i ApH BO e w H OrFRWO oN sos File maxsdr_cc txt sliders Fields Midi CC number Max UI object script name Low range value High range value Encoder Mode Flag 0 off 1 on Encoders will output 0 to decrease 1 to increase Note that all midi CC objects are assumed to have a range of 0 127 1 AFGain 70 6 0 2 AGCThresholdSlider 0 100 0 3 LPF1CutoffFreqSlider 1 128 0 4 LPF1IQSlider 0 1 0 24 lpflFreqShiftSlider 0 128 0 Diy LPF2CutoffFreqSlider 1 10000 0 6 RFGain 70 6 0 ir deviceTuningCoarseSlider 0 128 0 8 deviceTuningDataEntryFloat 0 1700 0 9 deviceTuningFineSlider 0 128 0 10 fineTuningSlider 0 128 0 11 humFilterWidthSlider 0 5 0 127 inputSelectMenu 0 10 0 13 mainTuningSlider 0 128 0 14 modeSelect
23. or recall a memory preset enter the number into the yellow preset number box and click the save or recall buttons The new button creates a new memory preset in the next available slot The clear button clears the currently selected memory preset Preset number 1 is the master reset slot Its not available for user presets Presets 2 7 contain example settings using sample IQ data files But you can overwrite them with your own data The tag field allows you to type in a description of the memory preset that will be saved along with the radio data To change default settings you ll need to unlock preset number one Open the pstorage sub patch by double clicking it Look for a green comment near the center of the patch that says unlock preset 1 Click on the lock 1 0 message to the left of the comment Then return to the main screen set the controls the way you want them select memory preset number 1 and click the save button Controlling Device Frequency Set the device frequency in the device tuning panel device tuning coarse ii O 7s Sd na Figure 23 Device tuning panel There are several methods 1 Arrow Keys Make sure the arrow keys on off toggle is on The up and down arrows control the tuning step from 1 Hz to 2 5 MHz The right and left arrows tune the frequency up and down Note if you adjust a gain slider using the mouse the focus of the arrow keys will go to that object instead of t
24. recently than this document Please check the file README txt either online or in the maxsdr5 folder It contains the latest installation information and known issues Currently the Soft66lc2 requires installation of library files on both Mac OS and Windows See the README txt file for the latest instructions Hardware Setup Cables A list of cables e For the Soft66lc2 o USB cable o stereo audio cable 1 8 mini jack o Antenna cable SMA e For the FUNCube o Antenna cable SMA Antennas In practice an outdoor dipole antenna gt 40 feet long 12 meters fed with coax or balanced line into a balun is an adequate general purpose all band receiving antenna For specific frequencies or to improve gain in a particular direction there are way too many options Check out the ARRL antenna links to get started Most radios work best with when presented with an antenna matched to an unbalanced 50 ohm transmission line In general e Outdoor antennas outperform indoor antennas e Higher and in the clear is better Audio If your device Soft66lc2 generates computer soundcard input e Use a stereo audio cable e Use the line in jack not microphone In Mac Os this is set in System Preferences e Make sure that system software settings for line in levels are turned up and not muted The FUNCube has a built in soundcard and will show up as a microphone device on your computer Using the program
25. strict the search or search for particular values The ISM input select menu is the index of the device in the input menu e 0 default soundcard e 1 soft66lc2 e 2 FUNCube e gt 2 example data files Time matches are done with a 24 clock based on the local time setting of your computer When you have set the search criteria press the search reset button IN p input_menu_clone T hour to match do ISM match do time match patcher findthings to s hitCount aPresetNumber 0 hit count Figure 25 scanner search engine The hit count number box will indicate the number of memory presets available for scanning At this point you can set the timing controls for the scanner and toggle scan start stop to begin Memory presets will be chosen in random order scan interval fade time random interval scan start stop 2 81 D r hitCount i p scan T T Figure 26 scanner controls Midi Specification Here are default Midi mappings for the UI controls There are two categories e Toggles and buttons use Midi note messages e Sliders and dials use Midi control change CC messages The note and control numbers are mapped to UI object script names which you can check using the object inspector or by viewing the pattrhub Client Window in the pstorage patch Mappings are contained in text files File maxsdr_note txt toggles and buttons Fields e Midi note number e Max UI scr
26. the input device Plug in the FUNCube before you run Max otherwise it won t show up in DSP Status Note If you are using an SDR like the Soft66lc2 which requires a soundcard connection use a stereo cable so that both I and Q signals are connected to the computer See the Troubleshooting section below and check the online README file for more helpful suggestions Basic operation audio input Figure 19 audio input menu p menu_set defaultAudiolnput Figure 20 Input select menu These 7 steps will help you get started Turn audio on lower right corner Select a source from the audio input menu if other than Built in Input Select a device or file from the radio device file menu Adjust preamp RF gain for a reasonable level Select mode SSB AM FM FMW Enter device frequency by a Typing a frequency in MHz into the device tuning panel see below b Using the left right arrow keys see below c Using a control surface d Recalling a previously saved memory preset see below 7 Adjust main tuning slider under the bandscope DY E Audio on off audio on off Figure 21 The master switch In the lower right hand corner you will see a large toggle button labeled audio on off This is the main on off switch It will turn green when it s on Memory presets clear tag r currentPreset recall Save pee gt master reset Figure 22 Presets To save
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