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n6gn

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  • Some Observations While Using the KiwiSDR to Spot WSPR Stations [fixed in v1.242]

    My initial look only a few minutes after loading v 1.242 here is that both the ~24 Hz spurious we reported as well as the SNR degradation we saw and wrote about in the above PDF are substantially or completely gone.

    It will take a more data gathering to confirm this but I'm quite confident that efforts by yourself and John have very significantly improved KiwiSDR performance, not just on WSPR but on all modes.

    This is a big deal!

    Thank you for all your work.

    Glenn n6gn
    WA2ZKDLX1DQ
  • Some Observations While Using the KiwiSDR to Spot WSPR Stations [fixed in v1.242]

    Gwyn Griffiths, G3ZIL gwyn@autonomousanalytics.com , Glenn Elmore, N6GN
    n6gn@sonic.net, Rob Robinett, AI6VN, rob@robinett.us

    Abstract

    This article is intended to document some of our recent experiences using a KiwiSDR on WSPR and observed degradations of those spots when compared with other receiving and decoding techniques. Three techniques are examined: complete decode of WSPR stations by way of the KiwiSDR WSPR extension, use of the KiwiSDR to downconvert to an audio file which is decoded by a remote host, and for contrast a non-KiwiSDR path using an Apache Angelia SDR board. These comparisons show degradations in the two KiwiSDR paths both in terms of SNR of spotted stations and in number of stations spotted. Additionally these investigations have identified spurious signals associated with the downconversion process within the KiwiSDR.

    [download article PDF below]
    KA7UGene
  • Distortion & Noise Measurement of a new KiwiSDR, June 2018

    I recently received a KiwiSDR from Mass Drop and made some measurements of distortion and noise of the unit. These measurements and their results are detailed in the attached file.

    Glenn n6gn
    WA2ZKDfractional_nrrobinetjksHB9TMCrz3dvp
  • Distortion & Noise Measurement of a new KiwiSDR, June 2018

    I recently received a KiwiSDR from Mass Drop and made some measurements of distortion and noise of the unit. These measurements and their results are detailed in the attached file.

    Glenn n6gn
    WA2ZKDfractional_nrrobinetjksHB9TMCrz3dvp
  • Distortion & Noise Measurement of a new KiwiSDR, June 2018

    I recently received a KiwiSDR from Mass Drop and made some measurements of distortion and noise of the unit. These measurements and their results are detailed in the attached file.

    Glenn n6gn
    WA2ZKDfractional_nrrobinetjksHB9TMCrz3dvp
  • Distortion & Noise Measurement of a new KiwiSDR, June 2018

    I recently received a KiwiSDR from Mass Drop and made some measurements of distortion and noise of the unit. These measurements and their results are detailed in the attached file.

    Glenn n6gn
    WA2ZKDfractional_nrrobinetjksHB9TMCrz3dvp