So, basically, my opinion is that using anything other than an SDR to measure sun noise (or moon noise) these days is dinosaur-like behavior. There are no startling revelations in it: Here is a brief paper on using SpectraVue for measuring sun noise. VK3UM also wrote a detailed paper on sun noise in 2008. I already had an SDR-IQ, and so that is what I have done ever since. I was going to duplicate Paul’s system more a decade or so ago when I ran into Al Ward W5LUA at Dayton, and he indicated that I should advance to the current century and use an SDR-IQ ( or maybe it was an SDR-14, I don’t remember ) taking the IF signal from the 10 GHz transverter along with SpectraVue running in the Continuum mode to do this. Paul wrote this article before SDR’s had come onto the scene for Amateur Radio use, and so he used a wide-band (several MHz bandwidth) analog system using a 10 GHz transverter, some interdigital filters, and an amplifier feeding an HP 432 power meter. ![]() Paul Wade W1GHZ wrote an excellent although now dated article on this subject in the 1990s: ![]() The key to getting an accurate measurement is in having sufficient bandwidth of the sampled signal, whether the technique used is an old analog method or a more technologically advanced SDR-based method. This is is followup to our discussion at the MWL just past regarding measuring sun noise / moon noise.
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