[Hackrf-dev] Static/warbling non reception issue
Cinaed Simson
cinaed.simson at gmail.com
Sun May 1 15:49:09 EDT 2016
On 05/01/2016 06:38 AM, David Goldstein wrote:
> Maybe someone has an extio that will fix this...?
Yes there is an extio - the poster could supply the list with the
parameters he's using and his hardware setup.
>
> On Apr 30, 2016 11:39, "Dominic Spill" <dominicgs at gmail.com
> <mailto:dominicgs at gmail.com>> wrote:
>
> I can't remember how it works in SDR#, but in GQRX you can just click
> on the display and it will start demodulating that frequency instead
> of the centre frequency. It's probably the same in SDR#
>
> Dominic
>
> On 30 April 2016 at 16:36, davidmarkusgoldstein at gmail.com
> <mailto:davidmarkusgoldstein at gmail.com>
> <davidmarkusgoldstein at gmail.com
> <mailto:davidmarkusgoldstein at gmail.com>> wrote:
> > Hi Dominic,
> >
> > Yeah 101.5 and 103.3 are right in town or nearby. I will have to
> test the
> > offset features better...I will let you know how this goes.
> >
> > David
> >
> >
> > Sent via the Samsung Galaxy Note® II, an AT&T 4G LTE smartphone
> >
> >
> > -------- Original message --------
> > From: Dominic Spill
> > Date:04/30/2016 11:23 AM (GMT-05:00)
> > To: david.goldstein.93 at alumni.vanderbilt.edu
> <mailto:david.goldstein.93 at alumni.vanderbilt.edu>
> > Cc: hackrf-dev
> > Subject: Re: [Hackrf-dev] Static/warbling non reception issue
> >
> > On 30 April 2016 at 00:32, David Goldstein
> > <davidmarkusgoldstein at gmail.com
> <mailto:davidmarkusgoldstein at gmail.com>> wrote:
> >> Hi, here's a screenshot of the settings that I can change, plus the
> >> spectrum analysis shot. The audio I get is heavily distorted on
> the strong
> >> local FM stations.
> >
> > The station at 101.5MHz looks like an excellent signal.
> >
> >> So, I have no idea what's wrong, except that it could be the
> sound driver
> >> or on-board sound.
> >
> > Are you demodulating the signal at the centre frequency? Or at an
> > offset? The spike in the middle is the DC offset, so if you're
> > demodulating there you're going to see bad data. It's explained in
> > more detail here:
> >
> https://github.com/mossmann/hackrf/wiki/FAQ#what-is-this-big-spike-in-the-center-of-my-received-spectrum
> >
> > Thanks,
> > Dominic
> >
> >> -----Original Message-----
> >> From: Dominic Spill [mailto:dominicgs at gmail.com
> <mailto:dominicgs at gmail.com>]
> >> Sent: Friday, April 29, 2016 5:40 PM
> >> To: davidmarkusgoldstein at gmail.com
> <mailto:davidmarkusgoldstein at gmail.com>
> >> Cc: hackrf-dev
> >> Subject: Re: [Hackrf-dev] Static/warbling non reception issue
> >>
> >> On 29 April 2016 at 17:31, davidmarkusgoldstein at gmail.com
> <mailto:davidmarkusgoldstein at gmail.com>
> >> <davidmarkusgoldstein at gmail.com
> <mailto:davidmarkusgoldstein at gmail.com>> wrote:
> >>> Hi, how can I test the hackrf to see if it's damaged? I have sound
> >>> card issues, it seems, on my i7-2600 win7 64 bit system, so I
> tried it
> >>> on a Vista laptop and experienced the same: static and
> choppiness and
> >>> some distorted voice on local fm. So perhaps the radio is damaged.
> >>
> >> This doesn't necessarily mean that the radio is damaged, although
> we can
> >> help to test whether it is, but it may be something not quite
> right in your
> >> settings. Telling us which settings you are using for sample
> rate, gain,
> >> filter, etc would really help us to diagnose the problem.
> >>
> >> Thanks,
> >> Dominic
> >>
> >>> -------- Original message --------
> >>> From: Dominic Spill
> >>> Date:04/28/2016 7:31 PM (GMT-05:00)
> >>> To: davidmarkusgoldstein at gmail.com
> <mailto:davidmarkusgoldstein at gmail.com>
> >>> Cc: hackrf-dev
> >>> Subject: Re: [Hackrf-dev] Static/warbling non reception issue
> >>>
> >>> On 28 April 2016 at 20:28, davidmarkusgoldstein at gmail.com
> <mailto:davidmarkusgoldstein at gmail.com>
> >>> <davidmarkusgoldstein at gmail.com
> <mailto:davidmarkusgoldstein at gmail.com>> wrote:
> >>>>
> >>>> Hi, this might not be a tech support list but I don't know what
> to do
> >>>
> >>> Hi David,
> >>>
> >>> We're happy to provide tech support through this mailing list; I'm
> >>> sure we'll be able to help you.
> >>>
> >>>> ...everything seems set up properly but I get static and broken up
> >>>> voice broadcast on local fm. I think it's the alc889 Realtek sound
> >>>> card doing this...I had this issue with a winradio g 315
> because I'm
> >>>> running win 7 64bit.
> >>>
> >>> Are you using SDR# on your Win7 install? Could you give us some
> >>> examples of the settings you are using? If it's easier, you can
> >>> attach a screenshot of the setting panel in SDR# (or whichever tool
> >>> you're using). You could also attach a screenshot of the tool
> so that
> >>> we can see how strong the signal is compared to the background
> noise.
> >>>
> >>>> They tweaked a driver for me and I got the winradio running but I
> >>>> don't know what to do now with the hackrf I have, if it is the
> sound
> >>>> card at all. Any tips?
> >>>
> >>> One option would be to try not using realtime processing.
> Capture ~20
> >>> seconds FM station to a file, then demodulate it from the file
> >>> afterwards. Finally, you should be able to play back the file as
> >>> audio. If it's a problem with the quality of the signal being
> >>> received, the output will still be choppy, but if the output is
> smooth
> >>> we can look at where else things may be going wrong.
> >>>
> >>> It certainly looks like you have enough CPU power and RAM to support
> >>> the task that you're trying to do, so we'll have to narrow down
> where
> >>> the problem could be.
> >>>
> >>> Thanks,
> >>> Dominic
>
>
>
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