The issue is caused by large sample buffers, mainly the USB buffer size. I've worked around it before by just patching gr-osmosdr and libhackrf to use smaller buffers. This isn't a great fix because it will increase chance of dropped samples at high rates. Here are the patches:
https://github.com/miek/gr-hubsan/blob/master/hackrf-16k-buffer.diff https://github.com/miek/gr-hubsan/blob/master/gr-osmosdr-16k-buffer.diff You may also need to play around with GNURadio max. buffers as discussed here: https://gnuradio.org/doc/doxygen/page_operating_fg.html#latency On 4 December 2015 at 13:47, Mitja kocjančič <veso...@gmail.com> wrote: > Hi I am transmitting FM Modulated signal on 76 Mhz and recieving it on my > Sangean ATS 909X > > The signal is normal FM Radio signal with RDS and Stereo but for some > reason there is 1 second delay (when I change song for instance it takes 1 > seconds for my Radio to notice that) > > Thats strange to me because I always thought that FM Modulation happens in > real time and when you say something into microfone radio will pick > it immediately. > > I know that 1 second delay happens with DAB (because you must encode audio > and then decode it) but not on FM > > So could anybody be so kinf and tell me the reason why this delay happens > and how to overcome this. > > Thanks for Anwsering and Best Regards > > _______________________________________________ > HackRF-dev mailing list > HackRF-dev@greatscottgadgets.com > https://pairlist9.pair.net/mailman/listinfo/hackrf-dev > >
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