Re: [Discuss-gnuradio] USRP for physics project

[n]

> Regardless of whether you use the stock FPGA design or a custom one to do raw 
> data capture you are going to run up against the basic limits of 1GB/s 
> i.e 1Gb/S = 125MB/S = 62.5M 16bit samples/S
> 
> The stock image is always going to want to send an I and Q channel, and has 
> the option of either 25MSamples/S @ 16bit or 50MSample/S @ 8bits and it's 
> going to pass the data through either 1 or 2 low pass FIR filters to decimate 
> to that data rate.
> Even if you write a very custom FPGA design that packs 14bit data efficiently 
> and uses a raw UDP transport, you would be doing well to  achieve 70MSample 
> @14bits over ethernet since real world performance never quite matches 
> theoretical.

Thanks for your reply, I think I'll go ahead and order one to play with. I can 
live with 25MSamples/S for the moment and try and do some compression later.
The I/Q stuff is more worrying, I guess I can always convert back to real in 
software on the host?

It would be nicer not to have to so I may try looking at the Verilog and see 
how easy it would be to make these changes. Alternatively if there's a 
contractor
out their who would be interested in doing this please mail me!