Gwyn Griffiths, Rob Robinett and Glenn Elmore "Estimating LF-HF band noise while acquiring WSPR spots". Experiment findings documenting our investigations into RMS and FFT noise estimation methods and their use in WsprDaemon with KiwiSDRs. Unpublished report on ResearchGate.net, 2019.

Technical reports and articles that present methods, applications and results connected with WsprDaemon

Gwyn Griffiths, Rob Robinett and Glenn Elmore "Estimating LF-HF band noise while acquiring WSPR spots". Article Used with permission, September/October 2020 QEX; copyright ARRL. Summary of methods within WsprDaemon and examples of noise observations.

There is much information on WsprDaemon on the KiwiSDR Discussion Forum

WSPR, wsprdaemon, kiwirecorder and a separate topic on

wsprdaemon noise graphs

Clint Turner, KA7OEI, who uses WsprDaemon with several KiwiSDRs at the Northern Utah SDR site, has an informative and practical blog post on calibrating the signal and noise measurements and setting the correct values into the wsprdaemon.conf file.

Technical

Simplified diagram of the WsprDaemon database architecture and its relationship to wsprnet

Glenn Elmore, N6GN "Notes on Improving Station Noise Performance". Version 0.3 5 December 2021.  Noise reduction can become a quantifiable RF engineering problem with lots of pieces to keep track of. But the results have shown themselves to be achievable and very worthwhile. The WSPR database and tools help greatly toward this.

Gwyn Griffiths, with contributions from Rob Robinett and  Phil Barnard "Success rates of uploads to wsprnet.org". A detailed study that shows that WsprDaemon has a 100% success rate in spot upload but that when using WSJT-X it depends on the processing power of, and processing load on, the computer and can vary from 88% to 99.9%.

Lo, S., N. Rankov, C. Mitchell, B.A.  Witvliet, T. P. Jayawardena, G. Bust, W. Liles, and G. Griffiths. 2022. "A Systematic Study of 7 MHz Greyline Propagation Using Amateur Radio Beacon Signals"  Atmosphere  13, no. 8: 1340. https://doi.org/10.3390/atmos13081340. This paper investigates 7 MHz ionospheric propagation between pairs of distant countries that simultaneously lie on the terminator. Drawing on local noise observations from WsprDaemon the observed asymmetry in reception pattern could be due to the increased electromagnetic noise across Europe summer afternoons/evenings from thunderstorms.

Gwyn Griffiths, G3ZIL "M3.9 Solar Flare Radio Noise Observed using KiwiSDRs and WsprDaemon Noise Estimates". This one-page note shows how the noise level recorded by WsprDaemon at several KiwiSDR sites rose in response to a Solar Noise Burst from the M3.9 Solar Flare around 1911 UTC on 7 May 2021. These results were for 21 MHz WSPR band. Sites with local noise typical of residential areas saw a small increase or none at all.