Just specify the frequency you want to tune to with -f. You shouldn't need to specify -i.
On Thu, Nov 19, 2015 at 2:29 PM, mourad ghafiri <[email protected]> wrote: > @Karl Koscher > > I used the Gnu radio, I will use the hackrf_transfer , but please would > you help for IF parameter > [-i if_freq_hz] # Intermediate Frequency (IF) in Hz [2150MHz to 2750MHz] ? > > I don't know what to set for IF since I need to tune hackrf at 1.575 GHz > and Bandwidth of 2 MHz and a sampling rate > 2*2 MHz > > would you give me a complete command for these requirements, > > Thank you so much in advance > > Regards; > > > On Thu, Nov 19, 2015 at 10:22 PM, Karl Koscher <[email protected] > > wrote: > >> How doesn't it work? You should probably just use the hackrf_transfer >> program to record data from the HackRF. By default, it stores data in >> complex int8 format. >> >> On Thu, Nov 19, 2015 at 2:18 PM, mourad ghafiri <[email protected] >> > wrote: >> >>> @Karl Koscher >>> >>> unfortunately the approach doesn't function well... please any hint to >>> achieve that goal which is: >>> >>> having an GPS L1 signal streaming for post processing with matlab/octave >>> ? we have HackRF and a GPS L1 antenna ... but we don't have enough >>> knowledge in hardware side, but we do know how to manipulate a file >>> streaming with float or int8 matrix data in Matlab/octave. >>> >>> Yours Sincerely; >>> >>> On Thu, Nov 19, 2015 at 10:11 PM, mourad ghafiri < >>> [email protected]> wrote: >>> >>>> @David Brown >>>> >>>> I appreciate your interaction with that basic question, in fact we are >>>> recording a L1 GPS streaming for post processing in a Matlab project for >>>> GPS positioning... so all we need simply is a file that contain an int8 >>>> type record. >>>> >>>> @Karl Koscher >>>> >>>> thank you so much, I will try this blocks Immediately and get back to >>>> you; if you still have time to complete this friendly (hackerfly :) ) >>>> conversation. >>>> >>>> On Thu, Nov 19, 2015 at 10:04 PM, Karl Koscher < >>>> [email protected]> wrote: >>>> >>>>> Use a Complex to Float/Real and Float to Char type converter block >>>>> between the HackRF source block and the file sink, and then change the >>>>> file >>>>> sync type to char. Or you can use the hackrf_transfer program and avoid >>>>> these conversions altogether. >>>>> >>>>> On Thu, Nov 19, 2015 at 1:49 PM, mourad ghafiri < >>>>> [email protected]> wrote: >>>>> >>>>>> thank you for your quick answer, please how to record the streaming >>>>>> in int8 type >>>>>> >>>>>> Regards; >>>>>> >>>>>> On Thu, Nov 19, 2015 at 9:40 PM, Karl Koscher < >>>>>> [email protected]> wrote: >>>>>> >>>>>>> You are recording complex floats. The intermediate frequency is your >>>>>>> frequency of interest minus what the HackRF is tuned to. If your HackRF >>>>>>> is >>>>>>> tuned to 1.575 GHz but you want to decode the GPS L1 signal, then your >>>>>>> IF >>>>>>> is 420 kHz. >>>>>>> >>>>>>> On Thu, Nov 19, 2015 at 1:36 PM, mourad ghafiri < >>>>>>> [email protected]> wrote: >>>>>>> >>>>>>>> I attached the flow graph for the recording as well as a real time >>>>>>>> spectrum , I'm not sure what blocks to use or what parameters to set >>>>>>>> for >>>>>>>> this block in order to have the right streaming. >>>>>>>> thanks for showing interest to the question >>>>>>>> >>>>>>>> On Thu, Nov 19, 2015 at 9:16 PM, Karl Koscher < >>>>>>>> [email protected]> wrote: >>>>>>>> >>>>>>>>> How are you recording the samples? >>>>>>>>> >>>>>>>>> On Thu, Nov 19, 2015 at 1:05 PM, mourad ghafiri < >>>>>>>>> [email protected]> wrote: >>>>>>>>> >>>>>>>>>> Hello; >>>>>>>>>> >>>>>>>>>> please any help to figure out what is the Intermediate Frequency >>>>>>>>>> used for HackRF in Gnuradio... >>>>>>>>>> >>>>>>>>>> I'm recording a streaming file for GPS and I don't know what is >>>>>>>>>> the appropriate type ( int; float...) and what is the appropriate IF >>>>>>>>>> to use >>>>>>>>>> in order to process that streaming in Matlab. >>>>>>>>>> >>>>>>>>>> Best Regards; >>>>>>>>>> >>>>>>>>>> _______________________________________________ >>>>>>>>>> HackRF-dev mailing list >>>>>>>>>> [email protected] >>>>>>>>>> https://pairlist9.pair.net/mailman/listinfo/hackrf-dev >>>>>>>>>> >>>>>>>>>> >>>>>>>>> >>>>>>>> >>>>>>> >>>>>> >>>>> >>>> >>> >> >
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