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

[Karl Koscher]

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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