Lecture and Lab Presentation 08-26-2018: Measuring Return Loss with the RTL-SDR

return loss plot_cropSeveral club members and guests have asked if I can share my presentation…so here it is!

Some links you might find helpful include:

The scanning and comparison software that we installed and practiced using, RTLSDR-Scanner: https://eartoearoak.com/software/rtlsdr-scanner

The “runner up” software that can, sometimes, display spectrum graphs in real time, Spektrum: https://github.com/pavels/spektrum/releases (be sure to use version 1.2)

The article on the RTL-SDR blog about measuring filters and antennas with USB antenna dongles. It uses a slower process than just scanning with RTLSDR Scanner, but you get full control over your data and graphs: https://www.rtl-sdr.com/rtl-sdr-tutorial-measuring-filter-characteristics-and-antenna-vswr-with-an-rtl-sdr-and-noise-source/

VE2AZX’s article on home-brewing your own RF impedance bridges: http://www.ve2azx.net/technical/RLBridges.pdf

A math-heavy Stack Exchange thread on how most VSWR meters really work: https://ham.stackexchange.com/questions/9778/how-does-an-swr-meter-really-work

And finally, but best of all, Walter Maxwell, W2DU’s excellent series of articles about reflections in transmission lines. http://www.k6mhe.com/files/Reflect_rev1.pdf

I hope you enjoyed the presentation!

You can also follow this direct link: https://docs.google.com/presentation/d/e/2PACX-1vSpGSkIXmkSwbDbZ54sXGE9fqbXySjp88MDZQjIZjJGhVR-0H9cW44nYX5pCuQT8xKgH5xpbVHyhSAq/pub?start=false&loop=false&delayms=60000