David, Did you try the suggestion below from Karl? I'm fairly sure this will solve your problem.
Thanks, Dominic On 1 May 2016 at 21:29, Karl Koscher <[email protected]> wrote: > I don't think you sent the screenshot to the mailing list... or at least I > didn't see it? (Does this mailing list even support attachments?) > > You don't need anything special to do offset tuning. The DC spike should not > move as you drag the spectrum display left or right. Drag the spectrum > display until the signal you want is free of the DC spike or other noise, > then click on the middle of the signal you want to tune in. It should then > demodulate cleanly. > > Here is a screenshot of how it should look: > http://sysnet.ucsd.edu/~supersat/sdrsharpfm.png > > Make sure WFM is selected with a bandwidth of 150000. > > On Sun, May 1, 2016 at 1:13 PM, [email protected] > <[email protected]> wrote: >> >> I'd even consider buying studio1, if I can get this to work. I posted the >> basic settings screens...the signals are strong on the spectrum. >> Everything's just so inaudible and static'd. >> >> >> Sent via the Samsung Galaxy Note® II, an AT&T 4G LTE smartphone >> >> >> -------- Original message -------- >> From: Cinaed Simson >> Date:05/01/2016 3:49 PM (GMT-05:00) >> To: [email protected] >> Subject: Re: [Hackrf-dev] Static/warbling non reception issue >> >> 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" <[email protected] >> > <mailto:[email protected]>> 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, [email protected] >> > <mailto:[email protected]> >> > <[email protected] >> > <mailto:[email protected]>> 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: [email protected] >> > <mailto:[email protected]> >> > > Cc: hackrf-dev >> > > Subject: Re: [Hackrf-dev] Static/warbling non reception issue >> > > >> > > On 30 April 2016 at 00:32, David Goldstein >> > > <[email protected] >> > <mailto:[email protected]>> 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:[email protected] >> > <mailto:[email protected]>] >> > >> Sent: Friday, April 29, 2016 5:40 PM >> > >> To: [email protected] >> > <mailto:[email protected]> >> > >> Cc: hackrf-dev >> > >> Subject: Re: [Hackrf-dev] Static/warbling non reception issue >> > >> >> > >> On 29 April 2016 at 17:31, [email protected] >> > <mailto:[email protected]> >> > >> <[email protected] >> > <mailto:[email protected]>> 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: [email protected] >> > <mailto:[email protected]> >> > >>> Cc: hackrf-dev >> > >>> Subject: Re: [Hackrf-dev] Static/warbling non reception issue >> > >>> >> > >>> On 28 April 2016 at 20:28, [email protected] >> > <mailto:[email protected]> >> > >>> <[email protected] >> > <mailto:[email protected]>> 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 >> > >> > >> > >> > _______________________________________________ >> > HackRF-dev mailing list >> > [email protected] >> > https://pairlist9.pair.net/mailman/listinfo/hackrf-dev >> > >> >> _______________________________________________ >> HackRF-dev mailing list >> [email protected] >> https://pairlist9.pair.net/mailman/listinfo/hackrf-dev >> >> _______________________________________________ >> HackRF-dev mailing list >> [email protected] >> https://pairlist9.pair.net/mailman/listinfo/hackrf-dev >> > > > _______________________________________________ > HackRF-dev mailing list > [email protected] > https://pairlist9.pair.net/mailman/listinfo/hackrf-dev > _______________________________________________ HackRF-dev mailing list [email protected] https://pairlist9.pair.net/mailman/listinfo/hackrf-dev
