Satrian Aerospace

SDR MK1.5 `Andrus`

Second version of the popular SDR receiver has built-in 10/100base Ethernet adapter, which allows using up to 400kHz IF bandwidth over the network. New design also includes a new, more powerful processor, now enabling to use full capacity of the radio circuitry and making it up to 10 times more powerful.
By using compatible SDR software, it is now possible to see a 400kHz wide chunk of radio spectrum at once, given the software supports it. A complete list of compatible free SDR software is listed in Specifications.

SDR MK1.5 Andrus is implementing the existing industry standard protocols of RFSpace. The radio implements NetSDR for networking support and SDR-IQ for serial communication, but it does not identify itself as RFSpace radio (for a very good reason that this would violate tRFSpace’s rights!), therefore it may not be compatible with RFspace software. 

Another improvement over the previous version is the radio’s internal clocking system which is now all synchronous with the output sample rate. Thanks to this approach, there is significantly less noise on the received signal once it reaches your computer, ehich is well visible (or absent thereof) on the SDR software screen!
The SDR MK1.5 ‘Andrus’ is a fully digital design with two identical RF frontends which can be used simultaneously, so one channel can be used for monitoring, while another one can be used for scanning around the band. The presence of two channels also enables combining the two signals, so in urban areas it is possible to use the second channel for noise cancelling! This feature makes the MK1.5 a unique design as there are currently no other amateur/consumer SDR radios available which would allow that!


  • 5kHz to 30MHz frequency range
  • 64MHz maximum internal sampling rate
  • Compatible with most free SDR software, such as SDR-Radio, Winrad, Linrad, HDSDR, CuteSDR etc.
  • User Programmable AGC (automatic gain control) with enhanced Power Detector
  • 123dB total dynamic range with AGC (80dB with AGC off)
  • 0.02Hz tuning resolution
  • 10/100Base Ethernet interface for 400kHz sample rate through network (NetSDR protocol mode)
  • 48kHz/16-bit Ch A and Ch B simultaneous USB audio output (looks like a standard USB audio interface to computer)
  • 234kHz single-channel or 2x117kHz dual-channel USB output with libusb driver
  • Comprehensive daughtercard for up to 2.2GHz downconverter and input bandpass filters available on Q2 2013
  • On-board RS232TTL compatible serial port and I2C interface for driving external peripheral
  • Powered from USB port (requires Y cable for drawing power from two USB sockets simultaneously) or external 5VDC adapter (not included) (custom PoE can be fitted)
  • 2x BNC Antenna connectors (Mfg: Rosenberger)
  • Max current consumption 600mA
  • Open software and hardware design for DIY development, filter upgrades etc.


– Received my MK1.5 today 13th May 2012 – its a stunning radio – and the metal case is very smart too… Well done for completing such a demanding project and good luck in the future with this project. –


– A very well designed and implemented SDR radio.Was a bit difficult to locate the latest files but the installation was very smooth and I was able to start using it with HDSDR in less than 30 minutes,using a Thosiba NB200 small laptop running Windows 7 (48Khz sampling / 8Khz output). –

Jose Maria

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