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  • The Solar Eclipse multi site Measurement using RF-Seismograph Participants needed! Be part of the big solar eclipse Measurement using your station. The setup that is planned for the solar eclipse measurement is a multi site noise measurement using the RF_Seismograph. All the participants are using LIF units that connected their shortwave radio to the sound card of their computers...
    alexschwarz237@... 23 Jun
  • Hi Everybody; The MDSR team has completed a new software development. This time it is a new spectrum analyzer with a twist. We have developed a new SAC (spectral amplitude correction) feature for it and it allows to correct the displayed spectrum to a flat display by correcting the filter skirts amplitude. A totally flat spectrum results, just as you would expect from a...
    alexschwarz237@... Mar 12, 2015
  • Hi Everybody; The MDSR Team again has extended the capability of the hardware interface to include such popular radios as the K3 and the FTdx-3000. The difficulty in making these radios compatible with the LIF down-converter unit was the difficulty of getting suitable LO crystals which would yield a 12kHz IF for the sound card input. As a LO can be used any stable oscillator with...
    alexschwarz237@... Nov 12, 2014
  • Hi Everybody; MDSR is the software that let you get SDR performance out of your analog RIG. To see how go to our website - see below. Adam Farson (VA7OJ) uses a -90dB notch to test the performance of receivers in a test called NPR (noise power ratio). I personally believe it is the best way to test a receiver regardless if it is an SDR or a conventional receiver. Unfortunately a...
    alexschwarz237@... Oct 17, 2014
  • Hi Everybody; We have upgraded the antenna on the MDSR test station. The G5RV was retired and replaced with a "Double Bazooka" made out of RG-58. This antenna is a horizontal dipole, but uses coaxial cable instead of antenna wire. The advantage of coax, instead of regular antenna wire is the reduction of the wave propagation inside the coax. This velocity factor allows for shorter...
    alexschwarz237@... Sep 5, 2014
  • Hi Everybody; We are currently testing the JT-65 mode on 30m (10.138Mhz), 20m (14.076MHz), 17 (18.102MHz) and 15m (21.076MHz). The frequency band chosen depends on the time of day and when band openings occur. Frequencies will be announced in the Yahoo user group. https://groups.yahoo.com/neo/groups/mdsradio/info If you have JT-65 capability, please help us to make as many...
    alexschwarz237@... Aug 20, 2014
  • Hi Everybody; The MDSR and the BiLIF hardware gives HAM radio operators to upgrade their analog radios to an IF SDR. The MDSR software V2.8 can be downloaded from our group or the MDSR website. for more information please join our group: https://groups.yahoo.com/neo/groups/mdsradio/info MDSR website: http://users.skynet.be/myspace/mdsr We have just finished testing the MDSR...
    alexschwarz237@... May 20, 2014
  • Hi Everybody; MDSR (Modulation – Demodulation Software Radio) has been developed as a software package to run on a home computer. But since the software is developed in Java, it runs very well on a laptop computer too. The only issue has been the need to have an internal high performance soundcard. We could not find a decent USB soundcard that would have the performance to match...
    alexschwarz237@... Apr 25, 2014
  • Hi Everybody; MDSR V2.8 is now available for download (includes Manuals in PDF) MDSR has again concentrated to bring you the best audio quality out of your existing analog RIG by turning it into an IF SDR. A simple and reversible modification on many analog transceivers is all it takes to connect the down converter (LIF2012 – available as kit) or the BiLIF (also a kit) to the...
    alexschwarz237@... Feb 25, 2014
  • Hi Everybody; Gary Pearce (KN4AQ) is presenting the MDSR project in his 116th. episode of HAM Radio Now. You can watch his take on the show and introduction followed by the talk given by Alex Schwarz (VE7DXW) about the MDSR project. Your transceiver, a computer and a LIF2012 kit is all you need to experience the MDSR software and turn your rig into a SDR radio. Here is the link...
    alexschwarz237@... Jan 4, 2014