[Discuss-gnuradio] More experiments with 8-bit options on USRP2

[Marcus D. Leech]

Put together a test flow-graph today that is just a UHD-source and an 
1024-bin FFT sink at 10frames/sec.

I configured the source for 50Msps, with 8-bit samples.   My AMD Phenom 
II X6 1090T was able to keep up, but if I inserted
  even a single multiplier block between the source, and the FFT, I 
started getting nearly-continuous 'O'.

This suggests to me that actually "doing anything" with data at 50Msps 
is going to be a challenge.  The way the FFT sink works
  is that it decimates the input quite aggressively (in vectors of 
FFT-length) before doing anything with the data--it throws most
  of it away in order to support the configured frame-rate.

--
Marcus Leech
Principal Investigator
Shirleys Bay Radio Astronomy Consortium
http://www.sbrac.org