Sorry for the pointer to pointer question. I now understand how it
works. As for the polyphase filter.

build mpoints fir filters…

    for i in range(mpoints):
        f = gr.fft_filter_ccc(1, sub_taps[mpoints-i-1])
        self.connect((self.s2ss,i), f)
        self.connect(f, (self.ss2v, i))
        self.connect((self.v2ss, i), (self, i))

The existing wiring is correct from what I understand. The fact that
the sub filters get connected from last to first
(f=gr.fft_filter_ccc(1,sub_taps[mpoints-i-1])) does the same as
feeding the input samples in from bottom to top.

Looking at everything now, it seems to be fine. I just can’t get it
to work correctly. I’ll play around to try and see what I’m doing

Thanks for all the help so far.


Sebastiaan H.
Radar and Remote Sensing Group, University of Cape Town
Tel: +27 83 305 5667

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