[Hackrf-dev] HackRF as a function generator

[MA]

Thanks Dominic.
Here's the answers I got from IRC, for the record:

1- if the scope has a 50ohm termination mode and you use it, that's fine.
otherwise it's almost the same as leaving the output open circuit which is
bad. you should use a dummy load, an easy way to set it up is with a BNC T
piece & dummy load on one side
2- If your scope does not have a way to switch the input into 50 ohm mode,
you can get a 50 ohm adapter.)

Anyway, I bought a 50-ohm terminator and a T-shape BNC connector (I will
post some pictures later)

Best regards
Mehdi

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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