Eric

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

wrong.

Thanks for all the help so far.

Sebastiaan

–

Sebastiaan H.

Radar and Remote Sensing Group, University of Cape Town

Tel: +27 83 305 5667