Can I ask a silly question Can you use gnu radio as a filter sweeper
Perhaps hack rf sig gen in harmony with rtl sdr to sweep a filter or preamp for gain response Since gnu radio is like a spectrum analyser Andrew Sent from my iPhone > On 28 Oct 2017, at 1:15 am, Marcus Müller <muel...@kit.edu> wrote: > > If you want to first manually correct, add a Qt GUI Range block, give it the > ID "dopplercorrection", and allow a start and stop of +- what you > expect. Set the default value to zero. > > Then, add a "rotator" block, and put in the "Phase Increment" field the > value you want to advance the phase of every sample. In fact, that means that > you want to put in "-dopplercorrection/sampling rate" there. > > I made a quick toy example: > > <dopplercorrection.grc.png> > > In fact, the correcting part of a PLL pretty much does the same, > mathematically, ideally. > > Now, I'm not 100% familiar with the nature of packet radio, but in the end, > you want automatic doppler tracking – so, you typically do stuff like using a > "band-edge FLL" block to roughly bring the signal's spectral power to the > center of your baseband, then –if necessary– you'd probably try to use the > structure of the packet to get finer frequency information, to correct the > rest. > > Best regards, > Marcus > >> On 2017-10-27 16:04, Andrew Rich wrote: >> I am up to the stage of adding fft and scope sinks and resamplers and >> sliders >> >> Need to explore the blocks >> >> Curious about doppler correction >> >> Andrew >> >> >> >> Sent from my iPhone >> >>>> On 27 Oct 2017, at 11:35 pm, Marcus Müller <muel...@kit.edu> wrote: >>>> >>>> Glad you're getting engaged with SDR, and especially GNU Radio! >>>> So, if you're completely new to GNU Radio, I'd recommend the "official >>>> Guided Tutorials": >>>> >>>> http://tutorials.gnuradio.org >>>> >>>> They start out rather smooth, and you can "stop" at any point (e.g. if you >>>> don't actually want to learn how to write your own C++ block, read only >>>> the chapters before that happens), and you'll get a pretty good idea of >>>> how things fall into place. Generally, feel free to ask here, or on IRC, >>>> or Slack, whatever feels nicest to you :) >>>> >>>> Best regards, >>>> Marcus >>>> >>>> >>>>> On 2017-10-27 14:19, Andrew Rich wrote: >>>>> Thanks Marcus >>>>> >>>>> I can now start learning gnu radio >>>>> >>>>> Andrew >>>>> >>>>> Sent from my iPhone >>>>> >>>>>> On 27 Oct 2017, at 10:09 pm, Marcus Müller <muel...@kit.edu> wrote: >>>>>> >>>>>> Hi Andrew, >>>>>> >>>>>> most SDR devices are most easily usable in GNU Radio with the "Osmocom >>>>>> Source" block, contained in gr-osmosdr. >>>>>> >>>>>> BUT: to get an gr-osmosdr with the AirSpy driver, you need to, in this >>>>>> order >>>>>> >>>>>> 1. Install GNU Radio and libairspy >>>>>> >>>>>> 2. build gr-osmosdr from source (Do NOT install it as binary package) >>>>>> >>>>>> You get libairspy from [1]. >>>>>> >>>>>> Best regards, >>>>>> Marcus >>>>>> >>>>>> >>>>>> [1] https://github.com/airspy/airspyone_host >>>>>> >>>>>> >>>>>> On 2017-10-27 11:16, Andrew Rich wrote: >>>>>> Hello >>>>>> >>>>>> Can some one tell me please what I need to do to use my AirSpy Mini as a >>>>>> source in GRC. >>>>>> >>>>>> What do I need to install ? >>>>>> >>>>>> The only other SDR I have is RTL-SDR and HackRF and Funcube Dongle >>>>>> >>>>>> Want to start learning packet radio >>>>>> >>>>>> Andrew Rich VK4TEC >>>>>> _______________________________________________ >>>>>> Discuss-gnuradio mailing list >>>>>> Discuss-gnuradio@gnu.org >>>>>> https://lists.gnu.org/mailman/listinfo/discuss-gnuradio >>>>> _______________________________________________ >>>>> Discuss-gnuradio mailing list >>>>> Discuss-gnuradio@gnu.org >>>>> https://lists.gnu.org/mailman/listinfo/discuss-gnuradio >
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