Oh drat I forgot about that DC spike. I had gone through all the tutorials. I guess I have a bad case of information overload. Thank you for reminding me. Mike
> On Jul 1, 2016, at 8:37 AM, Cinaed Simson <[email protected]> wrote: > > Here's a simple NBFM receiver. > > Note, center_freg contains a DC spike - you need to look at the signal > of interest off center. > > See the Michael Ossmann tutorials at > > https://greatscottgadgets.com/sdr/ > > The first lesson takes the enclosed flow graph and builds a tuneable FM > receiver by adding a signal source, channel_freq, low pass filter, > rational resampler, FM modulator and audio sink > > https://greatscottgadgets.com/sdr/1/ > > Also, lesson 5 is the HackRF One operating manual > > https://greatscottgadgets.com/sdr/5 > > On 06/30/2016 08:49 PM, [email protected] wrote: >> I am having trouble getting clear sounding audio out of my HackRF One >> receiver in NBFM mode. >> The audio sounds raspy. >> I am using an external 10Mhz GPS disciplined TCXO clock. >> I ran all the gains down and up but the raspy sounding audio persists. >> RF=0, IF=16, BB=16 as default gains. >> Here is a link to my grc setup. >> http://hamsoftware.org/SDR/NBFM_quad.grc.png >> >> I am got WBFM working pretty well. Even have RDS on it. >> I am running this on Ubuntu 16.04. I used the Ubuntu binaries for GnuRadio. >> I am sure I am making some sort of mistake. >> Oh, I also tried this on both a USB-2 and USB-3 port. No difference. >> >> I am new to SDR. Trying to find a good source for grc examples also. >> Heck of a learning curve. >> Mike >> _______________________________________________ >> HackRF-dev mailing list >> [email protected] >> https://pairlist9.pair.net/mailman/listinfo/hackrf-dev >> > > <fm_rx.grc>_______________________________________________ > 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
