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rx2fits is an SDR code for the rx888mk2 direct-sampling receiver that streams spectral data with frequency up to 65 MHz to FITS files. This code is for the direct-sampling input of the receiver, which transmits real samples over USB3 at up to 130 MHz sample rate. rx2fits processes these samples to spectral intensities via a Fourier-transform poly-phase filter bank, which provides spectral resolution approaching the spectral bin width with good stop-band and adjacent-channel rejection. ...

...Those are heterodyning receivers covering frequencies from near zero to about 1.7 GHz with up to 8 MHz analog bandwidth in a complex-valued data stream. The central program, `spec`, acquires samples from a receiver, spectrally analyzes them, and saves the spectra to two-axis FITS files. The codes run on linux on .Net and are written in C# and Visual Basic.Net. There is a file viewer, fitsview, written in python. rsp2fits evolved from SDRPlay2RSS, developed in 2015, to its current simpler form retaining only FITS-file data sink.