[Hackrf-dev] HackRF as a function generator

[MA]

1- Here's the arguments:
osmocom_siggen -a hackrf -f 100e6 --sine

2- I haven't, but I will

3- Yes. (Default freq, Max freq and Min freq)

Maybe that's because the deviations in FM frequency is very small (50KHZ
each side), so I can't see them on oscilloscope and I should use a spectrum
analyzer

Thanks
Mehdi

On Mon, Nov 23, 2015 at 8:18 PM, Dominic Spill <dominicgs at gmail.com> wrote:

> On 22 November 2015 at 21:28, MA <mehdideveloper at gmail.com> wrote:
> >
> > 1- When I use osmocom_siggen, I see nothing on oscilloscope (are there
> any
> > tweaks/tips I should know?)
>
> I've never used it, but could you share the command line arguments
> that you used?
> Do you see any change at all when you change the parameters?
>
> > 2- I used a very simple FM transmitter (on 14MHZ) and connected its
> output
> > to oscilloscope, but what I see is a pure sinusoidal wave, not an FM
> > modulated one. A picture and the GRC file are attached.
>
> I see that this works for you, but have you tried something simpler?
> Perhaps based on the one here:
> http://wiki.opendigitalradio.org/Simple_FM_transmitter_using_gnuradio
>
> > I have tested this file with 80MHZ and could easily listen it on a FM
> radio,
> > so it works and produces something
>
> Is the only thing that you change between the 80MHz/14MHz runs the
> frequency in the osmocom sink?
>
>
> > On Sun, Nov 22, 2015 at 2:50 PM, Dominic Spill <dominicgs at gmail.com>
> wrote:
> >>
> >> On 21 November 2015 at 19:57, MA <mehdideveloper at gmail.com> wrote:
> >> >
> >> > Can I connect HackRF's output directly to an oscilloscope? (in TX
> mode,
> >> > running osmocom_siggen)
> >> > I was worried whether connecting it (without using an antenna or dummy
> >> > load)
> >> > would hurt HackRF's output.
> >>
> >> I would suggest using a dummy load to be cautious, but I really have
> >> no experience of connecting HackRF One directly to other equipment.
> >>
> >> Mike Ossmann, Jared Boone or anyone else who has tried this can
> >> probably give a better response as to why you would/wouldn't need to.
> >>
> >> Thanks,
> >>   Dominic
> >>
> >> > On Sun, Nov 15, 2015 at 9:20 PM, Dominic Spill <dominicgs at gmail.com>
> >> > wrote:
> >> >>
> >> >> On 14 November 2015 at 09:56, MA <mehdideveloper at gmail.com> wrote:
> >> >> >
> >> >> > Can I use HackRF as a function generator?
> >> >>
> >> >> From a software point of view, it's very easy to accomplish.  If you
> >> >> want to use GNU Radio you can use the waveform generator block [1]
> >> >>
> >> >> > (The only thing I've found is "osmocomm_siggen" and a single page
> in
> >> >> > Michael's Recon2014 presentation, under "Baseband Expansion Board"
> >> >> > title)
> >> >>
> >> >> From the hardware side, there is a header on HackRF (P9 on the right
> >> >> hand side of this image) which allows access to the baseband, giving
> >> >> you direct access to the output of the DACs (and input to the ADCs).
> >> >> The "Baseband Expansion Board" would be plugged in to that header to
> >> >> allow signals to be used without passing through the analogue
> >> >> front-end.  The expansion board would be used to mix the I and Q
> >> >> signals (and possibly offer some other features).
> >> >>
> >> >> Dominic
> >> >>
> >> >> [1]
> >> >>
> >> >>
> https://gnuradio.org/doc/doxygen/group__waveform__generators__blk.html#gac97c0f42ffb63f1265decceaaeab9177
> >> >> [2] https://i.imgur.com/og7TGVz.jpg
> >> >
> >> >
> >
> >
>
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