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

[mourad ghafiri]

@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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