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 <jdmcd...@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.wat...@loumiaconsulting.com] > *Sent:* Tuesday, September 30, 2014 3:15 PM > *To:* McDonald, J Douglas; hackrf-dev@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@greatscottgadgets.comhttps://pairlist9.pair.net/mailman/listinfo/hackrf-dev > > > > _______________________________________________ > HackRF-dev mailing list > HackRF-dev@greatscottgadgets.com > https://pairlist9.pair.net/mailman/listinfo/hackrf-dev > >
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