I'm using a USRP and the usrp_rx_cfile program to record data for later processing. When I graph the recorded data, it looks choppy as if I need to sample at a higher rate. I have done a few runs at various decimation rates and I'm confused by the resulting file sizes. When I set the decimation rate to 4, 8, or 16 for a constant period, the resulting recordings are approximately the same size. At decimation rates of 32 or higher, the recording sizes reduce dramatically. I would expect the recording sizes to increase inversely and proportionally to the decimation rate. The fact that this isn't happening makes me suspicious of whether changing the decimation rate is really doing anything. I thought it might be that the USB throughput was the limiting factor when decimation rates we low, but I tried recording shorts rather than floats to reduce bandwidth usage, but I saw the same results. What am I missing?
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