Re: [Discuss-gnuradio] question about bandwith B210 - USB3

[Marcus D. Leech]

On 06/30/2016 06:48 PM, Przemek Lewandowski wrote:

Hello 

I need to generate as wide bandwith as possible. Yes I know that this is waste of energy, but beside this simple example I want to put some other channels. 

On my USRP B210 I can afford now about 18 MS.

I read on Ettus page that B200 can tx about 40 - 60 MS - depends on USB driver.

So 15 MS is 3 times slower :) Im very beginer with filters at gnu radio so I suppose that default filters can be not so good optimized and propably I will need it to fix it manually.

What do You think ???

This is my graph:
https://www.dropbox.com/s/xzwvb0dm25ubh5i/bandwith_test2.grc.png?dl=0

All The Best.

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So, if your signal is only a few kHz wide, why do you need it to be sampled at 18Msps?      The degree to which a USRP can be "kept full"
  is a product of "can by USB3 controller provide data at the desired rate?"  and "can my computer, given when I'm asking it to do,
  keep up with the required data rates?".

Each step in a flow-graph consumes some amount of CPU-cycles-per-sample.  If the aggregate of those is, on average, greater than your
  CPU+Memory can actually cope with, then you won't be able to keep the USRP "full" and you'll run into underruns.