I was experimenting with this the other day. I used
the wide band FM modulator instead, since the
deviation can be set. Here's the flow graph.
http://www.w6rz.net/fmtest.grc
The test audio files. sine01.wav is 0.1 Hz and
sine15k.wav is 15000 Hz.
http://www.w6rz.net/sine01.wav
http://www.w6rz.net/sine15k.wav
Some C code to generate audio files at other frequencies.
http://www.w6rz.net/sine.c
Ron
On 5/22/2014 9:26 PM, jason sam wrote:
Hi,
I have made the flowgraph as attached..It is showing the modulation in
scope but in fft block it's continuously changing so I am still
unable to find out that what are the max and min frequencies??I know
how to find that in theory but i want to prove it from my results..
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