Installation

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To use Spectrum Lab with SDR-IQ or SDR-14 (Software Defined Radios by RFSPACE),you will need the USB Serial Drivers by FTDI installed on your system, ora TCP/IP connection to a remote 'SDR server' (USB-TCP/IP gateway). But ifyou have an SDR-IQ or SDR-14 connected to your PC, you will most likely alreadyhave the program SpectraVue (by MoeTronix) installed. In that case, the FTDIdrivers are already installed, and Spectrum Lab can talk 'directly' to theradio (it doesn't require any ActiveX control to work). Since the USB connectionto the radio can only be occupied by ONE application at a time, it is impossibleto have Spectrum Lab and SpectraVue running side-by-side.

Download Allgemein Drivers

SDR-IQ or SDR-14 directly connected to the local PC via USB / FTDI driver :

If SpectraVue has not been installed on your system, you need to installthe FTDI drivers. Search the net for 'FTDI D2XX drivers', which should takeyou to a download site at www.ftdichip.com. Look for the 'setup executable'(it's easier to install than the zipped archive, which lacks any'setup'-feature). When tested with Windows XP and the FTDI D2XX driver, theLEDs on the SDR-IQ were immediately turned on after the driver was installed,and Spectrum Lab could communicate with the radio (see next paragraph). Thereis almost no documentation on the FTDI site how to install or supervise theD2XX driver, so here's how and where to find it in the windows (XP) systemcontrol:

  • Open the system control (in German: Systemsteuerung), select 'System' (System in der 'klassischen' Ansicht)
  • In the System property panell ('Systemeigenschaften'), select the 'Hardware' tab
  • On the 'Hardware' tab, click on the Device Manager (?) button (Button 'Geräte-Manager')
  • In the Device Manager, find the 'USB-Controller' branch
  • At least on a german PC with windows XP, there was an item labelled 'USB Serial Converter' .
    This actually turned out to be the FTDI driver (!!) where the SDR-IQ was connected, because:
  • Double click on the 'USB Serial Converter' (or the branch under 'USB Controller' which you guess may be the SDR...)
  • On the author's XP machine, a dialog titled 'Eigenschaften von USB Serial Converter' appeared, which showed ...
    • On the tab labelled 'Allgemein' (Common ?) :
      Gerätetyp : USB Controller
      Hersteller: FTDI
      Ort: Pfad 0 (SDR-IQ) <<<< a-ha !
      (so we know this 'USB Serial Converter' thingy is in fact the SDR-IQ's internal FTDI chip,
      and we can check if the driver is reasonably new on the next tab ... especially after looking at FTDI's release notes..)
    • On the tab labelled 'Treiber' (Driver ?) :
      Treiberanbieter : FTDI
      Treiberdatum : 12.07.2010
      Treiberversion : 2.8.2.0 (this was after installing V 2.08.02 from the FTDI site)
      Signaturgeber : Microsoft Windows Hardware Compatibility Publisher
  • If the driver date, or version number is older than the one shown on the FTDI site (for the 'D2XX Direct Driver' or 'FTDI CDM Driver' which fits your system), read the RELEASE NOTES, and if you find something like 'various bug fixes and enhancements' there, don't hesitate to update the driver (download the 'executable' and run it).
    On the author's PC, updating from driver V2.02.04 to V2.08.02 cured occasional drop-outs at 196 kSamples/second .
  • If you use Vista or Windows 7, you're on your own at this point. Be shure to pick the right driver for your OS from the FTDI site !


Besides FTDI's USB driver (*.sys, located in some windows system directory),the 'setup executable' by FTDI will also copy an interface DLL into a windowsystem directory (under Win XP, c:WINDOWSsystem32ftd2xx.dll). Spectrumlab will try to load this DLL dynamically if necessary.

To let Spectrum Lab talk to the SDR-IQ 'directly' (via USB), uncheck the'remote' option on the SDR Control/Configuration panel (see below).

SDR-IQ or SDR-14 connected via TCP/IP (LAN) to a remote server :

As an alternative to connecting Spectrum Lab 'directly' to the radio (viaUSB), you can use a TCP/IP connection for remoteoperation. To do this, check the 'remote' option on the SDR Control/Configurationpanel (see next chapter), and enter the IP address and port number in theedit field next to the checkmark. If you are using MoeTronix's 'SDRxxServer.exe',the default port will be 50000. If the server runs on the same PC as SpectrumLab (for a 'local test'), use the IP address 127.0.0.1 .

To select SDR-IQ or SDR-14 for input (instead of the soundcard), open the'audio settings' tab in SL's configuration, and select 'SDR-IQ / SDR-14'in the list of 'Audio Input Devices'.
Note: SL doesn't check if the radio is really connected to the USB port inadvance !
Alternatively, to check if the installation was ok, select Quick Settings..Imagecancelling DC receivers (I/Q)..'SDR-IQ, 37 kHz sampling, downconverter, 3kHz audio bandwidth' in SpecLab's main menu. In this configuration, SL actsas a back-end for a software defined radio, including waterfall display andaudio output (through the soundcard). How to set the receiver frequency isexplained in the next chapters of this document. How to adjust the audiofilter is explained in anotherdocument.

SDR Control / Configuration Panel

To open the following control panel for the SDR-IQ / SDR-14, select View/Windows/ SDR-IQ Control Panel in SL's main menu:

SDR VFO tab / main control panel

You can modify the radio's NCO (numeric controlled oscillator) in the 'VFO'field. Either type the number, or click on one of the digits to place thecursor there. You can then increment / decrement the frequency with the cursorup/down keys, or with the mouse wheel (unlike SpectraVue, just pointing themouse above the edit field isn't sufficient ! ).
The RF gain combo changes the preamp gain / attenuator (AD8370), the IF gaincombo sets the digital IF gain (AD6620 in the SDR-IQ). Some less frequentlyused settings (which are specific to the SDR-IQ and SDR-14) must be set onthe 'cfg'-tab (config):

SDR Config tab

The radio's IF bandwidth (and, at the same time, the sampling rate) can beset on the 'CFG' (config) tab of this control panel :


Notes:

  • It may be necessary to stop and restart the external SDR before the new settings become effective. If SpecLab fails to do this automatically, or if the radio 'stalls' when switching to the new settings, stop and restart it from SpecLab's main menu ('Start/Stop'...'Stop Sound Thread'...'Start Sound Thread').
  • A sampling rate of 196 kHz creates a heavy load on the USB connection between the radio and the PC, and requires a relatively fast CPU. If you don't really need the 190 kHz displayed bandwidth, select a lower sampling rate - especially on a laptop running on batteries !

Other options on the SDR configuration tab are:

  • SDR clock frequency ( and the [Calibrate]-button )
    This edit field contains the precise clock frequency of the A/D-converter (AD9245) inside the radio. The nominal frequency is 66666666.6 Hz, but it can be calibrated if necessary. You can let the program calculate the precise value: Click the 'Calibrate'-button, enter the frequency of a well-known reference (for example, Droitwich on 198.0 kHz in Europe), and then the measured frequency. Use a large FFT, and a low sampling rate to get the best accurary of the frequency measurement.
    Note: The new clock frequency will be written into a special location of the radio's internal EEPROM memory, so SpectraVue can use this calibrated value, too.
  • [ ] add VFO frequency in the spectrum display
    If this option is selected, the VFO frequency will be added to the frequency scales in the main spectrum display, and when modifiying the VFO frequency (via mouse wheel for example), the displayed frequency range in the spectrum display will be adjusted, too.
    Otherwise, the main spectrum display will only show the 'audio' frequencies, and the display will not change when the VFO frequency changes.
  • [ ] stay on top
    With this option, the small SDR VFO control panel will always be visible on top of Spectrum Lab's main window, even if it doesn't have the focus.
  • [ ] remote (next to an input field for an IP address and port number)
    Use this option if you are using a TCP/IP connection between Spectrum Lab and the SDR instead of a local USB port. The IP address and the port number must be entered in the edit field next to this checkmark. For a 'local' test, try 127.0.0.1:50000 (which is the IP address of the 'local host', i.e. your own computer, and 50000 is the default port number for MoeTronix's SDRxxServer.exe). Also see these notes.
  • 'More...' (button)
    Opens a popup menu with the following options:
    • Use passband ripple compensation (for the FFT)
      If this menu is checked, the FFT for the main spectrum analyser will use the an FFT compensation table from SpectraVue to reduce the passband ripple caused by the AD6620 in the SDR. You only need the passband ripple compensation for extremely weak signal analysis, for example the EVE-experiment.
    • Select FFT compensation file
      Use this function to select one of the FFT compensation files from SpectraVue. There is one file for every sample rate in the 'FilterComp' directory of SpectraVue. For more information, see chapter 2.3.10.12 'Select FFT Compensation File' in the SpectraVue documentation.
      For example, for the 5 kHz filter bandwidth (8.1 kHz sampling), load 'Filter5.fcf'.


  • 'Apply' (button)
    Click this button to make some of the changes effective (not required for the VFO frequency, which will be sent to the radio immediately).


Because the sampling rates of the SDR-IQ are not integer multiples of thesoundcard's standard sampling rates (like 11025, 22050, or 44100 Hz), youneed Spectrum Lab's outputresampling function if you want to send the (demodulated) signal to theaudio output of the soundcard.


Remote Control for SpectraVue

For some special applications, Spectrum Lab can send control commands toSpectraVue through the registered messages mentioned in the SpectraVuemanual.
At the moments, the following commands can be used (copied from..command_filestestcmd.txt ). Of course, it makes more sense to use thesecommands in the conditional or scheduled actions.

; SpectraVue Control ..
svc.fc=12345678 // send center frequency in HERTZ
svc.fs=100000 // send center frequencyin HERTZ
svc.start //start SpectraVue
svc.pause //pause running (how to restart?)
svc.stop // stop running (-> SpectraVue 'idle')
svc.fcapture=0 // file capture (in SpectraVue)OFF
svc.fcapture=1 // capture RF in file
svc.fcapture=2 // capture DEMODULATED outputin file
svc.rfgain=0 // set RF gain (0..3;no effect?)
svc.ifgain=0 // set IF gain (0..4;0=max)
print 'SpectraVue: fc=',svc.fc,'Hz',' fs=',svc.fs,'Hz'

See also:
Selecting an Audio Input Device in Spectrum Lab (SDR, soundcard, or similar hardware)
Audio via COM port (serial port, from external A/D converter)
Using Spectrum Lab with Perseus
Using Spectrum Lab with FiFi-SDR
Using Spectrum Lab with a Winrad-compatible ExtIO-DLL for input
Troubleshooting

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