[Hackrf-dev] Auto-calibration in receiving mode

[Dominic Spill]

On 24 April 2018 at 09:52, Brian Gieryk <ke6iyc at mac.com> wrote:
>
> Never having used hackrf_sweep, this may be a stupid question.

Not a stupid question at all.

> Is there a peak find/hold function?

hackrf_sweep is the backend, while there are multiple frontend pieces of
software.  I believe that some of them have peak hold and some (e.g.
QSpectrumAnalyzer) show a waterfall plot that could be used to answer the
question of which frequency a devices is transmitting on.

> That may, if the span is narrow enough to eliminate strong signals of no
interest, be what is sought after.
>
> Then, perhaps, one could write a simple block, that tied into the peak
find, that would set the RBW to an appropriate value dependent on frequency?

That's a good thought.

>
> On Apr 24, 2018, at 08:37 AM, Dominic Spill <dominicgs at gmail.com> wrote:
>
> Hi Matteo,
>
> I think I understand what you're looking for.  You want to transmit a
signal, e.g. keyfob, and have the HackRF automatically show you the
frequency that it's transmitting on.
>
> You could use HackRF in a spectrum analyzer mode, such as hackrf_sweep,
to see where the transmission is and then manually zoom in to it, but
having the software do that automatically is more complicated because
there's no way to know which signal you are hoping to focus on.
>
> Does that answer your question?
>
> Dominic
>
> On 24 April 2018 at 03:03, Matteo Terzi <matteo.terzi97 at gmail.com> wrote:
>>
>> Hi Dominic,
>> What I'm trying to do is:
>> - I want to acquire a signal from a general device ( garage door opener
remote control, rf car's key etc). So I don't know the real value of the
signal (2Hz or 40GHz). Is the hackrf able to set itself on the right value
of frequency and let me know the result by means of a graphic. I wanna use
it as a sniffer/reader of frequencies.
>>
>> Thanks for the support
>> Matteo
>>
>>
>> 2018-04-24 0:20 GMT+02:00 Dominic Spill <dominicgs at gmail.com>:
>>>
>>> Hi Matteo,
>>>
>>> I'm not sure I understand the question.  What are you trying to
achieve?  Is there a known signal and you want to automatically find it?
Something like GSM and you want to know which frequency the local towers
are using?
>>>
>>> Or is it something else?
>>>
>>> Thanks,
>>>   Dominic
>>>
>>> On 17 April 2018 at 08:03, Matteo Terzi <matteo.terzi97 at gmail.com>
wrote:
>>>>
>>>> Hi all,
>>>> I'd like to know if there is a way to create a program, with GNU Radio
Companion, which can acquire an unknown signal and display it on a FFT
Sink, which should auto-calibrate on the right value of the signal.
>>>> To explain better:
>>>> I want to acquire a signal, but I don't know its value (Hz); so I need
a FFT Sink that can do an auto-calibration, according to the value of the
signal, to show me what the hackrf is acquiring, without having the issue
to set the sample rate of the FFT Sink to an huge value to cover all the
frequencies (difficult to visualize).
>>>> Thanks for the support
>>>>
>>>> Matteo
>>>> --
>>>> Matteo TERZI
>>>> Google Gmail Member
>>>>
>>>> _______________________________________________
>>>> HackRF-dev mailing list
>>>> HackRF-dev at greatscottgadgets.com
>>>> https://pairlist9.pair.net/mailman/listinfo/hackrf-dev
>>>>
>>>
>>
>>
>>
>> --
>> Matteo TERZI
>> Google Gmail Member
>
>
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