I agree, I don't think the harmonics are causing it to not transmit - that was just an aside. I mentioned before that your generated signal file is a lot shorter than the recorded signal, and wondered if it might be smaller than a buffer size in hackrf_transfer/libhackrf. Could you try a larger file?
On 30 June 2015 at 16:11, Peter Shipley <[email protected]> wrote: > Was it the harmonics that prevented the hackrf from transmiting then ? > > Oddly when eyeballing the data and gnuplot the data looks almost identical > except for my data being perfectly centered, the higher & low frequency are > exactly the same but for the phase shift. > > would that make any difference? > On Jun 29, 2015 3:42 PM, "Michael Ossmann" <[email protected]> wrote: > >> On Sun, Jun 28, 2015 at 08:49:40AM -0700, Peter Shipley wrote: >> > >> > As you may have guessed, my generated IQ stream was made with a loop >> > calling sin/cos and timing the transitions to times where I&Q can swap >> > symmetrically ( without jumping ). >> > what is then proper method for making phase transitions? >> >> One method is to smoothly lower the amplitude to zero at the transition >> and then back up to full amplitude by mid-symbol. This is done, for >> example, in PSK31. A simpler approach is to use an FIR low pass filter >> on your waveform before transmission. >> >> Mike >> >
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