Re: Working Narrowband FM examples?

[Gary Schafer]

What is the actual hardware connected as the Osmocom source? It might not like the 
specific sample rate you're trying to set (384k). I tried your graph with a RTL-SDR and 
got the exact, same thing with a 384k sample rate: "mwah mwah mwah". Change 
your sample rate to 1.536 MHz (an integer multiple of 48 kHz), set the quad rate of your 
NBFM Receive block to 1/2 of this (768000, due to the decimation by 2 in your FFT Filter 
block), and give it a whirl. I tried it on mine and it worked fine.
 
Let us know if this fixes it!
 
Gary
 
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> Hi Mike,
>
> That's exactly what I was looking for, thanks.
>
> However:  I swapped out the USRP source for an osmocom source, and it seems to be "mostly 
> working" but the audio comes through like the adults from the old Charlie Brown show from when 
> I was a kid.  Instead of clearly-intelligible speech like I can hear through GQRX, using gnuradio I 
> can only get speech that sounds like "mwah mwah mwah mwah"
>
>
> Attached is a .png of my flowgraph, hope it's not too large for the list (about 
> 100kB).
>
>
> Appreciate any advice anyone might have.
>
> Nathan