[Hackrf-dev] HackRF in SDR#

[Karl Koscher]

I built a debug version of hackrf.dll and added breakpoints to
hackrf_set_baseband_filter_bandwidth and
hackrf_compute_baseband_filter_bw_round_down_lt. They both seem to be
called appropriately.

On Tue, Sep 30, 2014 at 5:57 PM, McDonald, J Douglas <jdmcdona at illinois.edu>
wrote:

>  Its clearly trying to. But is it doing it right? I have no idea. I do
> know
> that in GnuRadio it SEEMS that you have to tell it one of
> the discrete published values from the chip data sheet or it seems not to
> work.
> One would have to look at lots of obscure source code, use some sort of
> debugging,
> or experiment, to know. And we don't know if that round down routine
> is in fact making it narrow enough. In my opinion the
> bandwidth should be user settable.
>
> Doug
>  ------------------------------
> *From:* Marcus Watson [marcus.watson at loumiaconsulting.com]
> *Sent:* Tuesday, September 30, 2014 3:15 PM
> *To:* McDonald, J Douglas; hackrf-dev at greatscottgadgets.com
> *Subject:* Re: [Hackrf-dev] HackRF in SDR#
>
>   Caveat: I know more about developing/reverse engineering than I do
> about SDR.
>
> I reverse engineered the SDRSharp.HackRF.dll - in looking for more info I
> then found a year old repository on Github for HackRF and the code hasn't
> changed significantly:
>
> https://github.com/cgommel/sdrsharp/blob/master/HackRF/HackRFDevice.cs
>
> var baseband_filter_bw_hz = NativeMethods.
> hackrf_compute_baseband_filter_bw_round_down_lt((uint)_sampleRate);
> r = NativeMethods.hackrf_set_baseband_filter_bandwidth(_dev,
> baseband_filter_bw_hz);
>
> Does this mean it's using the sample rate to set the baseband filter
> bandwidth?
>
> Marcus
>
>
> On 30/09/2014 16:19, McDonald, J Douglas wrote:
>
>  From my experience with SDR# and HackRf, it seems that whoever wrote the
>
> code to use HackRF is sending the wrong bandwidth option to the chip
>
> of the HackRF that limits it before Mr. Nyquist can have a fit. Its far far
>
> too wide.
>
>
>
> This is a trivial fix in the code attaching HackRF to SDR#..
>
>
>
> It would be better to add a box so the user could set the bandwidth.
>
>
>
> Doug McDonald
>
>
>
>
> _______________________________________________
> HackRF-dev mailing listHackRF-dev at greatscottgadgets.comhttps://pairlist9.pair.net/mailman/listinfo/hackrf-dev
>
>
>
> _______________________________________________
> HackRF-dev mailing list
> HackRF-dev at greatscottgadgets.com
> https://pairlist9.pair.net/mailman/listinfo/hackrf-dev
>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://pairlist9.pair.net/pipermail/hackrf-dev/attachments/20140930/1881d765/attachment.html>