If it works in GRC then it means that the problem is not with your HACKRF but with GQRX. Now that you mention it there is a constant 'hiss' when listening to WFM-stereo broadcast stations with a low sampling rate. The hiss goes away with WFM-mono and also when the sampling rate is set to 20000000.
FYI, here are my gain settings: RF Gain: 14.0 IF Gain: 24.0 BB Gain: 40.0 Audio Gain: 10.5 Remember not to have the radio station on the exact center frequency as the DC carrier is either in the way or you lose a bit from the DC removal feature (the box called 'DC rem.'). Try all this with the ANT500 supplied antenna as short as you can make it. Mike -- Mike Jameson M0MIK BSc MIET Email: m...@scanoo.com Web: http://scanoo.com On Mon, Sep 22, 2014 at 4:38 PM, Mehdi Asgari <mehdi.q...@gmail.com> wrote: > I'd already updated the SPI. I upadted the CPLD too. > I managed to get a good quality in GRC (before updating), but not in Gqrx. > What would you do in this scenario? What should be checked to make sure > everything is OK? > Could this be a problem if Gqrx? > > On Mon, Sep 22, 2014 at 6:49 PM, Mike Jameson <m...@scanoo.com> wrote: > >> Have you updated both the 'SPI Flash' and 'CPLD' firmware and rebooted >> the hackrf in between? Instructions below: >> >> https://github.com/mossmann/hackrf/wiki/Updating-Firmware >> >> Mike >> >> -- >> Mike Jameson M0MIK BSc MIET >> Email: m...@scanoo.com >> Web: http://scanoo.com >> >> On Mon, Sep 22, 2014 at 4:00 PM, Mehdi Asgari <mehdi.q...@gmail.com> >> wrote: >> >>> Thank you Mike. >>> I tried the above items, but there's no significant change in result. >>> I can clearly hear the radio, but it still comes with noise (In fact >>> I've played with every config that I thought is related, but I can't reach >>> the same quality level that I am receiving via RTL-SDR) >>> >>> On Mon, Sep 22, 2014 at 6:04 PM, Mike Jameson <m...@scanoo.com> wrote: >>> >>>> Some things to try: >>>> >>>> 1) Make your antenna as small as possible as you may be overloading >>>> it. Broadcast FM stations are strong! >>>> 2) Reduce the gain on all three gqrx gain controls (RF,IF & BB). Try >>>> just raising IF until the signal appears. >>>> 3) Set the center frequency to something slightly above or below the >>>> target frequency and click on the wanted frequency. >>>> 4) Set the sampling rate to 10e6 (10M) >>>> 5) Start GQRX using a fresh config with 'gqrx -r' >>>> >>>> Mike >>>> >>>> -- >>>> Mike Jameson M0MIK BSc MIET >>>> Email: m...@scanoo.com >>>> Web: http://scanoo.com >>>> >>>> On Mon, Sep 22, 2014 at 3:18 PM, Mehdi Asgari <mehdi.q...@gmail.com> >>>> wrote: >>>> >>>>> Hmmm, I am using the last version of tools (and I don't know how >>>>> should I change the magnitude) >>>>> By the way, why the same setup in Gqrx produces different outputs for >>>>> RTL-SDR and HackRF One? >>>>> Here's a link to two screenshots from Gqrx window which may be helpful. >>>>> HackRF: http://i60.tinypic.com/o7127d.png >>>>> RTL-SDR: http://i57.tinypic.com/10r79lc.jpg >>>>> >>>>> Thanks >>>>> Mehdi >>>>> >>>>> On Mon, Sep 22, 2014 at 4:54 PM, Simon IJskes <si...@ijskes.org> >>>>> wrote: >>>>> >>>>>> The experience sounds the same as my first attempt, under linux, with >>>>>> the old osmosdr software, where the magnitude of the signal was >>>>>> incorrectly >>>>>> assumed to be unsigned. >>>>>> >>>>>> After fixing this, it all sounded a whole lot better. >>>>>> >>>>>> Maybe this is also the case in your setup? >>>>>> >>>>>> Gr. Simon >>>>>> >>>>>> >>>>>> On 22-09-14 15:08, Mehdi Asgari wrote: >>>>>> >>>>>>> Hi >>>>>>> I am a beginner in SDRs (and DSP) >>>>>>> For the first sample, I'm, trying to build a FM receiver. I've tried >>>>>>> both RTL-SDR and HackRF One (with both GNU Radio and Gqrx) >>>>>>> I can easily get the desired station (on 88.0 MHZ) without noise on >>>>>>> RTL-SDR (using Gqrx or GRC) >>>>>>> But when I use HackRF One (with Gqrx or GRC), I can get the radio, >>>>>>> but >>>>>>> it's noisy. >>>>>>> Is is because HackRF's higher sensitivity or does it need more >>>>>>> adjustment to work fine? >>>>>>> >>>>>>> Note 1: I am using GNU Radio Live DVD and HackRF One with firmware >>>>>>> 2014.08.1 and RTL-SDR (RTL2832) >>>>>>> Note 2: >>>>>>> Link for using RTL-SDR with GRC: >>>>>>> http://www.instructables.com/id/RTL-SDR-FM-radio-receiver- >>>>>>> with-GNU-Radio-Companion/?ALLSTEPS >>>>>>> Link for using HackRF with GRC: Mike's lesson 1 >>>>>>> >>>>>>> >>>>>>> _______________________________________________ >>>>>>> HackRF-dev mailing list >>>>>>> HackRF-dev@greatscottgadgets.com >>>>>>> https://pairlist9.pair.net/mailman/listinfo/hackrf-dev >>>>>>> >>>>>>> >>>>>> _______________________________________________ >>>>>> HackRF-dev mailing list >>>>>> HackRF-dev@greatscottgadgets.com >>>>>> https://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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