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Marcus Müller marcus.mueller at ettus.comThese files just contain raw samples. The fact that the signal then isn't around 0 Hz is simply because it 1. (optionally/depends on example you're referring to) was mixed, in the generating GNU Radio script, onto a carrier frequency within the first Nyquist zone and 2. on the fact that DACs introduce *images* in spectrum at multiples of the sampling rate, and you exploit these to have a copy of your signal, shifted by a multiple of the sampling rate. You should filter out all the other copies. Terms to google for: reconstruction filter, band-pass undersampling Best regards, Marcus On Sat, 2018-06-09 at 00:47 +0100, Fred Neich wrote: > Hello, > > I have a question about osmo-fl2k, > the generated binary file using the fl2k grc transmission flow > graphs, contains the carrier frequency, > the fl2k_file stream the file to the device, so how the device can > transmit these data in that frequency. > I mean how it recognize the frequency to transmit on. > > > Thank you. > > >