Review of HF SDR upconverter (design by SV1AFN)

This is simply a very effective and functional SDR upconverter. Since, you’ve reached this post, I presume that you are aware of the purpose of any upconverter: You simply take one RF band and you shift it up in frequency without changing any of the signal characteristics that it carries. Operation in brief: This upconverter collects signals from an antenna, it filters them with a 55MHz LP filter, it amplifies…