I have been testing the capabilities of the pll blocks to hopefully be
used for a coherent receiver.
I have been using the gr.pll_ref_out(...) to lock a low IF signal.
What I have discovered is that the pll seems to be overdriving the
processor (2.4GHz P4) when its used at high sampling rates (200kS/sec
or above). Is this something you have encountered??
The destination block also seems to affect the processing burden. When
using the audio card sink as a destination block (24kS/sec) the pll
seems to work fine for a sinusoidal tone, but when I replace the audio
card sink with null sink (same sampling rate) or the oscope gui, the
processor goes crazy. I may be setting this up wrong, but just the
same I wanted to see if you have encountered this before.
I need this to work at high sampling rates like 2MS/sec so that I can
detect larger bandwidth signals, but right now I'm no sure.
thanks
david scaperoth
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