Re: [Discuss-gnuradio] 8-bit samples on USRP2 at 33.333Msps

2011-11-09 Thread Josh Blum
>> There is a configurable scale factor (see the stream args in the grc >> block). It defaults to a value that gives you the upper 8. >> >> -Josh >> > I noticed there was a "scalar=1024" option. Is that just a multiplier > that UHD applies on the host > side for 8-bit samples, or does it affect

Re: [Discuss-gnuradio] 8-bit samples on USRP2 at 33.333Msps

2011-11-09 Thread Marcus D. Leech
My AMD Athlon(tm) II X4 620 Processor does jyst fine with 50Msps FFT plotter. Just sayin :-) Hmmm, is the Athlon II generally better than the Phenom II (insns/clock? ). I suppose I should try it on my 1090T as well, which is rather faster than the 1055T I tried it on tonight. But that mean

Re: [Discuss-gnuradio] 8-bit samples on USRP2 at 33.333Msps

2011-11-09 Thread Josh Blum
On 11/09/2011 07:07 PM, Marcus D. Leech wrote: > Just did a quick test of 8-bit samples on a USRP2, on one of my 6-core > AMD machines. > > I can get to 33Msps with a fairly simple SOURCE-->MULT-->FFT_SINK > flow-graph, but anything more complicated causes overruns. > > If I try 50Msps, I get n

[Discuss-gnuradio] 8-bit samples on USRP2 at 33.333Msps

2011-11-09 Thread Marcus D. Leech
Just did a quick test of 8-bit samples on a USRP2, on one of my 6-core AMD machines. I can get to 33Msps with a fairly simple SOURCE-->MULT-->FFT_SINK flow-graph, but anything more complicated causes overruns. If I try 50Msps, I get near-continuous overruns. This is on an AMD Phenom II X6-10