BTW, are you using the cpm.py hierarchical block that is
on the trunk? If yes, I attach a simple python code that
demonstrates the spectral line generation for a 4-CPFSK
with h=1/2.
I definitely see the spectral lines for your case, which I believe is considered an MSK modulation. Unfortunately, I cannot assume that the signal will be MSK. When I change the index to another often used CPFSK index of 1/4, I noticed that the spectral lines go away...
any thoughts?
david
#self.connect (self.src,self.b2B,self.mod_old,self.fft_old)
#self.connect (self.b2B,self.mod_new
,self.fft_new)
self.connect (self.src,self.b2B,self.mod_new,self.fft_new)
self.connect (self.mod_new,(self.nonl,0))
self.connect (self.mod_new,(self.nonl,1))
self.connect (self.nonl
,self.fft_new1)
if __name__ == '__main__':
app = stdgui.stdapp (cpm_graph, "test CPM graph")
app.MainLoop ()