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Expert Electronics SunSDR2 DX Manual
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Expert Electronics SunSDR2 DX Manual

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Werner Schnorrenberg - DC4KU
www.dc4ku.darc.de
06.11.2021
SunSDR2 DX - Test Report
Based on the popular SDR transceiver SunSDR2 Pro, the manufacturer Expert Electronics offers the
"SunSDR2 DX". This transceiver operates as a direct-sampling Software Defined Radio (SDR) with a
high-resolution 16Bit A/D converter (LTC 2209), at a sampling rate of 160 MS/s. All amateur radio
bands from 160 to 6m
as well as the 2m VHF band (95...148MHz) are supported. The
(0.09...65MHz)
transmit power is 100W on shortwave, 50W on 6m and 7W on 2m. Changes compared to the
SunSDR-Pro concern the filters. A new high-pass filter from 100 MHz is built in, which leads to a
better sensitivity on VHF. For HF, 9 individual, optimized band-pass filters or a single low-pass filter
from 65 MHz are available. This combination is complemented by an additional low-pass filter from
70 MHz, which improves the dynamic range on shortwave (HF) and 6m.
The transmitter is designed to be completely independent of the receiver with its own quadrature
oscillator, allowing flexible half or full duplex operation. Together with the ExpertSDR2/3 software,
two independent main receivers and two independent sub-receivers in the same band range are
possible. Furthermore, the display of a wide spectrum of up to 80 MHz is possible.
The SunSDR2 DX is controlled via an Ethernet cable, which is connected either directly to a PC or to
the DSL router in the home network. With the help of the new ExpertSDR3 software and a "cloud"
provided free of charge by EE, the SunSDR2 DX can be easily operated worldwide from the Internet.
Complicated port forwarding and DynDNS are now a matter of the past.
Block diagram SunSDR2 DX
1

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Summary of Contents for Expert Electronics SunSDR2 DX

  • Page 1 Furthermore, the display of a wide spectrum of up to 80 MHz is possible. The SunSDR2 DX is controlled via an Ethernet cable, which is connected either directly to a PC or to the DSL router in the home network. With the help of the new ExpertSDR3 software and a "cloud"...

  • Page 2: Installation

    PC (Windows 10 32/64bit, Linux und macOS) and then connect the SunSDR2 DX to the PC via an Ethernet cable (Fig. 1). For the PC to recognize the transceiver its IP address must be changed.
  • Page 3 After switching on the transceiver again, it automatically connects to the router within a few seconds (Fig. 5). After restarting the software, the new SDR address and the new SDR port of the SunSDR2 DX can be seen under Options: 192.168.178.120:50071. The SunSDR2 DX is now connected to the home network and can be reached from all PCs on which the ExpertSDR2_SunSDR2DX software has been installed.
  • Page 4 Internet -> Release and release ports 50071 to 50073 (data and audio) on the Server-PC via TCP and UDP. Then open "ExpertRC" on the Client-PC, select Options -> Device and enter the public IPv4 address of the router and the port of the SunSDR2 DX, in the example: 92.36.144.213:50071 (Fig. 8).
  • Page 5 A special feature - which is not offered by any other manufacturer - is the remote control of the radios via a "cloud", which Expert Electronics provides free of charge. Here, server and client PCs are connected via a cloud-server (Fig. 10). Port-Forwarding and DynDNS are no longer necessary!
  • Page 6 Werner Schnorrenberg - DC4KU www.dc4ku.darc.de 06.11.2021 Figure 11: Registering at the EE-Cloud by email and password (left) and Log In (right). Figure 12: Successful connection Now there are two ways to connect server with client: Either via Web-Browser or via ExpertSDR3. a) After entering the URL https://cloud.eesdr.com:5450.auth.html in a browser (Opera), all radios connected to the cloud are displayed in a menu and can be started via "Connect"...
  • Page 7 S-Meter and dBm Display The SunSDR2 DX displays the signal level on a scale from S1 to S9 +80dB, as well as in "dBm". To check the dBm-accuracy, the RF signal of a calibrated signal generator is fed in at 14.2 MHz from S1 to S9+60dB (from -122dBm to -13dBm) and compared with the displayed value of the SunSDR2 DX.
  • Page 8 I know. The maximum error is +/- 0.5 dB over a range of 110 dB. With this extremely high accuracy, the SunSDR2 DX can also be used as a spectrum analyzer or as a measuring receiver.
  • Page 9 ADC, in the so-called sweet spot. With +10dB pre-amplification and switched on BP-Filters the SunSDR2 DX develops its best dynamics. At a level of Pi=2x-25dBm (2xS9+48dB) the largest DR3 of -25dBm - (- 131dBm) = 106dB (sweet spot) is produced (Fig. 18). With further signal enlargement the ADC then comes into its limitation (clipping).
  • Page 10 Figure 19: IMD3 curve as a function of a 2-tone signal, with BP-Filter (standard) and HF LP-Filter (0-65MHz) With a DR3 of 106dB the SunSDR2 DX reaches a very good dynamic range (Fig. 19). Better results are only achieved by analogue receivers with an extremely powerful mixer in the front end. In course of...
  • Page 11 Note on intermodulation The RF input of the SunSDR2 DX is protected by a series of BP filters (9 in total) by default. If required, only a 65MHz low-pass filter can be connected via the "use wide RX Filter: on" setting. But then it should be noted that the receiver is no longer protected against large signals.
  • Page 12 ) to the background noise level (MDS) corresponds to the NPR. For the SunSDR2 DX, this occurs at a P noise level of -5dBm/5MHz noise bandwidth. From this, its NPR is calculated as...

  • Page 13: Wide Band Scope

    Werner Schnorrenberg - DC4KU www.dc4ku.darc.de 06.11.2021 The NPR can be read directly from the spectrum display of the SunSDR2 DX, it is 76dB with a noise power of P = -5dBm/5MHz (Fig. 25). For NPR measurements, no limiting bandpass filters should be connected in front of the receiver, because otherwise there is a risk that not the entire noise spectrum reaches the input of the ADC.

  • Page 14: Noise Filter

    Werner Schnorrenberg - DC4KU www.dc4ku.darc.de 06.11.2021 If you reduce the span to e.g. 2-13MHz (Fig. 27, left) and switch the BP filters on again (use Wide RX filter: off), you can see the selective effect of the now reconnected BP filter in the 40m band (Fig. 27, riht).
  • Page 15 Werner Schnorrenberg - DC4KU www.dc4ku.darc.de 06.11.2021 Intermodulation of the transmitter In this test, a 2-tone signal (f1=700Hz, f2=1500Hz) is fed into the microphone input of the SunSDR2 DX and the transmitter is adjusted to maximum output power. The total power P of e.g.
  • Page 16 Werner Schnorrenberg - DC4KU www.dc4ku.darc.de 06.11.2021 relatively quickly as the frequency increases and decreases. In the noise spectrum, no individual spectral lines are now visible, but only a cumulative spectrum consisting of a virtually endless number of IMD products. For this reason, an IMD measurement with noise is in principle more true to reality than with only 2 signals.
  • Page 17 Table 8: Cumulative SBN (AM + FM) of the transmitter at a distance of 5...100k Hz from the carrier Transmitter Sideband Noise -110 IC-705 (10W) -120 IC-7300 (100W) -130 FT-DX10 (100W) -140 SunSDR2 DX (100W) -150 -160 Offset (kHz) DC4KU Figure 34: Transmitter composite noise at 7.1 MHz of the IC-705, IC-7300, FT-DX10 and SunSDR2 DX...
  • Page 18 With an SBN of only -140dBm/Hz at a distance of 10 kHz from the carrier, the noise of the transmitter is so small that the SunSDR2 DX can easily be used at Field Days without disturbing other stations by its sideband noise. Fig. 34 shows the cumulative TX-SBN of some modern transceivers.
  • Page 19 Werner Schnorrenberg - DC4KU www.dc4ku.darc.de 06.11.2021 (2) SunSDR2DX, HF/50MHz/VHF-Transceiver, User Manual https://eesdr.com/images/Document/SunSDR2_DX/SunSDR2_DX_User_Manual_ENG.pdf (3) Expert SDR3 Software https://eesdr.com/en/software-en/expertsdr3-en (4) Noise Power Ratio (NPR) Testing of HF Receivers https://www.ab4oj.com/test/docs/npr_test.pdf (5) Seitenbandrauschen von Sendern FUNKAMATEUR 09-2021...