Re: [Discuss-gnuradio] address@hidden,

[Andy Walls]

>                              From: 
> Fernando
>                           Subject: 
> [Discuss-gnuradio] WBFM
> modulation/demodulation high
> frequencies highly attenuated
>                              Date: 
> Wed, 26 Apr 2017 20:02:29 +0200
> 
> 
> 
> ______________________________________________________________________
> I'm modulating/demodulating a wide band FM signal and I observe that
> high frequencies are highly  attenuated.
> 
> This is the diagram
> 
> 
> High frequencies are attenuated more than 40dB over low frequencies.
> 
> It seems to happen for frequencies above 20Khz.
> 
> Changing max deviation in WBFM Transmit has no effect.
> 
> What am I doing wrong?

You are making a bad assumption about what the WBFM block actually does.

See the audio filter cutoff and attenuation level in the WBFM Tx block
here:

https://github.com/gnuradio/gnuradio/blob/master/gr-analog/python/analog/wfm_tx.py#L67

-Andy