On Tue, Feb 11, 2020 at 11:15 AM "Till Hülder" <till.huel...@web.de> wrote:

>
> Hello,
>
> i want to implement a FMCW-Radar  in a frequency-chirp. First i tested the
> frequency-chirp . I send the chirp from TX to RX of my USRP.
> I get this warning :
>
> UHD Warning:
>     For this connection, UHD recommends a receive frame size of at least
> 8000 for best
>     performance, but your system's MTU will only allow 1472.
>     This will negatively impact your maximum achievable sample rate.
>

Check how to change the MTU size on your interface to be 8000.  Google can
help with that.


>
> UUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUU
> >>> Done
>
> My constellation- and time gui looks unlikely (see attachment) on the top
> ist TX and the bottom ist RX.
>
> Does anybody has a solution for this?
>

Add more attenuation between TX and RX and/or change the gain of your RX to
be lower.

Brian

>

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