[Hackrf-dev] how to set IF in GNU Radio for HackRF

[mourad ghafiri]

even I need the IF it in the matlab project :) , so what value I should put
there, I will experiment the hackrf_transfer program and see to what extent
I will get the desired results.. and for sure I will share my results with
you and for the hackrf community as a contribution for GPS signal decoding,
if I do it myself :)

On Thu, Nov 19, 2015 at 10:40 PM, Karl Koscher <supersat at cs.washington.edu>
wrote:

> 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 <mourad.ghafiri at gmail.com>
> 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 <
>> supersat at cs.washington.edu> 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 <
>>> mourad.ghafiri at gmail.com> 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 <
>>>> mourad.ghafiri at gmail.com> 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 <
>>>>> supersat at cs.washington.edu> 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 <
>>>>>> mourad.ghafiri at gmail.com> 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 <
>>>>>>> supersat at cs.washington.edu> 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 <
>>>>>>>> mourad.ghafiri at gmail.com> 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 <
>>>>>>>>> supersat at cs.washington.edu> wrote:
>>>>>>>>>
>>>>>>>>>> How are you recording the samples?
>>>>>>>>>>
>>>>>>>>>> On Thu, Nov 19, 2015 at 1:05 PM, mourad ghafiri <
>>>>>>>>>> mourad.ghafiri at gmail.com> 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
>>>>>>>>>>> HackRF-dev at greatscottgadgets.com
>>>>>>>>>>> https://pairlist9.pair.net/mailman/listinfo/hackrf-dev
>>>>>>>>>>>
>>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>
>>>>>>>>
>>>>>>>
>>>>>>
>>>>>
>>>>
>>>
>>
>
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