Hi Andrew, I don't know if you're coming at this from the Software side or the Radio side but here is a good start: https://www.elttam.com.au/blog/intro-sdr-and-rf-analysis/ That and watch *all* of the videos on the GreatScott Gadgets site
--Chuck On Sat, Jul 8, 2017 at 6:17 PM, Andrew Rich <[email protected]> wrote: > Ok I have just watched a video > > I is an amplitude sample in time > Q is an amplitude sample in time > > They are just a little bit apart > > So what does an SDR program do with the I and Q ? > > How does it know when to start sweeping across the screen ? > > Sent from my iPhone > > > On 9 Jul 2017, at 11:01 am, Andrew Rich <[email protected]> > wrote: > > > > Ok my center frequency is 1090 MHz > > > > The on off rate is 1 MB/s I think from memory > > > > I have noticed the sampling rate determines the frequency span 10 MHz = > 10 MHz > > > > So there is a stream of I and Q coming out > > > > What is I and Q telling me ? > > > > Is I how far along the scan it is ? > > > > And is Q telling me how big the signal > > Is ? > > > > Would an IQ file contain a whole heap of scans ? > > > > I = X axis > > Q = Y axis > > > > I would need to sample fast enough as to not miss an amplitude change I > want to see > > > > I guess an IQ file is not plain text but 8 bit numbers packed ? > > > > Does it go IQIQIQIQ ? > > > > What relationship is I and Q to the center frequency ? > > > > I think the signal amplitude resolution is described as 8 or 12 bits ? > > > > So as the ADC is pumping out numbers, which it has no control over , it > is just sampling the signal. > > > > Why does it not just out put values of amplitude ? Or is that what the I > is about ? > > > > I am just trying to work out if I record 1090 MHz which is basically OOK > on off keying, what would be contained in the file ? > > > > Am I right with the 8 bits , IQIQIQ ? > > > > Andy > > > > Sent from my iPhone > > > >>> On 9 Jul 2017, at 5:18 am, Cinaed Simson <[email protected]> > wrote: > >>> > >>> On 07/08/2017 06:44 AM, Gregory Ratcliff wrote: > >>> Great request! I would like to see this also. > >>> > >>> Greg > >>> Nz8r > >>> > >>> Sent from my iPad > >> > >> A flowgraph as in gnuradio? > >> > >> Don't know. > >> > >> How about a python script using qt and gnuradio? > >> > >> Try > >> > >> https://github.com/bistromath/gr-air-modes > >> > >> You'll need to build it - might need a development environment. > >> > >> If you know what you're doing then you could probably build a flow graph > >> from gr-air-modes python scripts. > >> > >> -- Cinaed > >> > >> > >> > >> > >> > >> > >>> > >>> On Jul 8, 2017, at 6:23 AM, <[email protected] > >>> <mailto:[email protected]>> <[email protected] > >>> <mailto:[email protected]>> wrote: > >>> > >>>> Hello Guys > >>>> > >>>> > >>>> > >>>> I have a hack rf, GNURadio and MacBook Pro > >>>> > >>>> > >>>> > >>>> Can someone point me towards a flow graph that would show me the > >>>> pulses on 1090 MHz > >>>> > >>>> > >>>> > >>>> Showing the preamble and 56 and 112 bits please > >>>> > >>>> > >>>> > >>>> Andrew > >>>> > >>>> > >>>> > >>>> > >>>> > >>>> _______________________________________________ > >>>> HackRF-dev mailing list > >>>> [email protected] <mailto:HackRF-dev@ > greatscottgadgets.com> > >>>> https://pairlist9.pair.net/mailman/listinfo/hackrf-dev > >>> > >>> > >>> _______________________________________________ > >>> HackRF-dev mailing list > >>> [email protected] > >>> https://pairlist9.pair.net/mailman/listinfo/hackrf-dev > >>> > >> > >> _______________________________________________ > >> HackRF-dev mailing list > >> [email protected] > >> https://pairlist9.pair.net/mailman/listinfo/hackrf-dev > > > > _______________________________________________ > HackRF-dev mailing list > [email protected] > https://pairlist9.pair.net/mailman/listinfo/hackrf-dev >
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