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Alex Schwarz (VE7DXW) is an advanced HAM since 1990 and a graduate of the HTL, Innsbruck. In Austria he held the callsign OE7BBT from 1987 to 1990. He moved to Vancouver (Canada) in 1990 and has since been involved in professional communication systems (LDR trunking) and digital point to point wireless network systems. In 2005 he started work in the Biomedical Engineering Department at C&W Hospital in Vancouver.

He is also, besides ON6MU and VE3NEA, one of the major contributors to the MDSR project. All contributions from HAMs to the project have and will be documented and will be published yearly. The MDSR hardware is easy to build and software is free, flexible and can be adopted to almost any symmetric HF radio. This gives IF SDR performace to your existing hardware at a very affordable price. All you need is the LIF2012(2014) down-converter for RX, which can be ordered from our website.

Radios confirmed and tested include: FT-817, FT-857, FT-897(standard 455k kit), FT-950 ((needs 450k LIF kit); IC-703, IC-7000, IC-7200, IC-756 (standard 455k kit), IC-706 (needs 9MHz LIF kit).

Transceivers that can be used with the MDSR software without kit: IC-7100 (12kHz IF output through extension plug); Kenwood TS-2000 with 12kHz IF tab.

More info can be obtained at the MDSRadio Yahoo user group.

The MDSR (Modulation - Demodulation Software Radio) system has been featured in the QST magazine Jul 2012 and it's development has been published at the TAPR yearly conference in 2010, 2011 2012, 2013  and 2014. This year again, the MDSR has been chosen to be part of the TAPR show and will by in the annual TAPR magazine.

For more details and how you can build your own MDSR station with your existing radio please go the MDSR Website.

Thanks to Adam Farson VA7OJ / AB4OJ for his expertise and the use of his RF lab for compliance testing. His website is: www.ab4oj.com

All the best and 73;



Local  RF-Propagation at the MDSR Test Site in Vancouver, BC local time

                (realtime - updated every 10 min)     List of the last 6h

RF-Seismograph ImageRF Seismo Legend

If you want to set-up your station for monitoring propagation go to our website and contact us.

In comparison to the RF-Seismograph the NOAA propagation prediction, based on Solar Flux:

MDSR Software Interface



New Spectrum Analyzer Java SA


BiLIF Installation for IC-7000 (currently used as the VE7DXW base station:

BiLIF Installation for FT-817 :

BiLIF Assembly for compliance testing:

BiLIF Asus U7 USB soundcard for portable Operation (Laptop):

BiLIF Asus U7 USB soundcard with Asus T100 notepad computer:

8301797 Last modified: 2017-08-29 16:30:53, 5391 bytes

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United States Counties Award#999
Granted: 2016-07-19 17:46:52   (VE7DXW)

  • 100 Counties Mixed
  • 250 Counties Mixed
World Continents Award#7996
Granted: 2015-04-06 23:31:47   (VE7DXW)

  • Mixed Digital
United States Award#801
Granted: 2015-03-02 18:14:32   (VE7DXW)

  • Mixed Digital
Grid Squared Award#370
Granted: 2015-01-15 17:56:03   (VE7DXW)

  • 5 Band Mixed
  • 15 Meters Mixed
    17 Meters Mixed
    20 Meters Mixed
    30 Meters Mixed
    40 Meters Mixed
  • 20 Meters Digital
  • 40 Meters Digital
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