Thanks. Didn't change (tried both Mono and Stereo, tried your gain values and a lot of other combinations) And 20M overflows my CPU and I have to use a lower sampling rate (I've tested from 1.5M to 16M) My antenna is ANT500.
On Mon, Sep 22, 2014 at 7:31 PM, Mike Jameson <[email protected]> wrote: > 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: [email protected] > Web: http://scanoo.com > > On Mon, Sep 22, 2014 at 4:38 PM, Mehdi Asgari <[email protected]> > 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 <[email protected]> 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: [email protected] >>> Web: http://scanoo.com >>> >>> On Mon, Sep 22, 2014 at 4:00 PM, Mehdi Asgari <[email protected]> >>> 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 <[email protected]> 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: [email protected] >>>>> Web: http://scanoo.com >>>>> >>>>> On Mon, Sep 22, 2014 at 3:18 PM, Mehdi Asgari <[email protected]> >>>>> 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 <[email protected]> >>>>>> 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 >>>>>>>> [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 >>>>>> >>>>>> >>>>> >>>> >>> >> >
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