Re: [Discuss-gnuradio] Works with GR 3.6, breaks with 3.7

[Nick Foster]

That quadrature demod gain is pretty high. Feed the quadrature demod output to a 'scope plot and adjust the gain until it's around [1,-1]. Things like slicers don't care, but clock recovery blocks often do.

--n

On Sun, Oct 26, 2014 at 5:03 PM, Luke Berndt <address@hidden> wrote:

Thanks - Most bizarre. That probably means it is somewhere in my code. I am still trying to rebuild the demodulator just in case it helps. I have been following this guide: http://www.inguardians.com/pubs/GRC_signal_analysis_InGuardians_v1.pdf

I have attached a screenshot of the graph I am using and what the output looks like in Baudline. Does the output look about right? I was having trouble finding the FSK Deviation for the Quad Demod for Moto SmartNet. Does 4500Hz seem about right?

On Oct 20, 2014, at 3:19 AM, Martin Braun <address@hidden> wrote:

On 10/18/2014 05:57 PM, Luke Berndt wrote:

The Band Edge FLL works great for me too, on 3.6. Does anyone know if
there were changes to it or surrounding blocks in 3.7 that would make it
stop working?

None of the DSP was changed, if it worked before it should(TM) still
work. The reason we say it's a bad choice is that it was derived for
PSK/PAM signals. The reason it still might work is that the
implementation runs 2 filters at the band-edges and compares the energy
content of those, and that difference might be sufficient to correct
your frequency offset if you have sufficient averaging (i.e. low enough
loop bandwidth).

M


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