Re: Help : UHD

On Tue, Feb 11, 2020 at 11:15 AM "Till Hülder" <till.huelder@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