Okay...I checked compared to signals recorded on YouTube, and mine are inaudible comparatively. The sampling rate is 8...I'll give it more time, testing. I was thinking it was maybe a configuration file setting that can be adjusted...but let me do some more testing.
Thx! David Sent via the Samsung Galaxy Note® II, an AT&T 4G LTE smartphone <div>-------- Original message --------</div><div>From: Cinaed Simson <[email protected]> </div><div>Date:05/01/2016 4:47 PM (GMT-05:00) </div><div>To: [email protected], [email protected] </div><div>Subject: Re: [Hackrf-dev] Static/warbling non reception issue </div><div> </div>On 05/01/2016 01:13 PM, [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. > What is your sampling rate? Did you try turning it down? A sampling rate of 4-5 times the bandwidth is sufficient. WBFM is roughly 200 kHz - a sampling rate of 1.75 MHz is sufficient. It might not be the sound card - it might be the USB dropping data. > > 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
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