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:[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 > _______________________________________________ HackRF-dev mailing list [email protected] https://pairlist9.pair.net/mailman/listinfo/hackrf-dev
