[Hackrf-dev] NBFM problems

[Cinaed Simson]

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, k6eep at hamsoftware.org 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
> HackRF-dev at greatscottgadgets.com
> https://pairlist9.pair.net/mailman/listinfo/hackrf-dev
> 

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://pairlist9.pair.net/pipermail/hackrf-dev/attachments/20160701/942ccd78/attachment.html>