Re: [Discuss-gnuradio] fernando@samara.com.es,

> 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


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