Re: [Discuss-gnuradio] UHD USRP sink does not react to gain changes (gr-ieee802-11: between two usrp devices)

[Bastian Bloessl]

On 12 Dec 2013, at 11:31, Nasi <address@hidden> wrote:

> Meanwhile I use the second laptop and USRP N200 device as the receiver by 
> running the ./ofdm_rx.py. The error rate is very high.
> 

So you receive some packets or none?

> The problem is that when I change gain in the USRP sink nothing changes (i 
> tested it using 'wxgui_fftsink'). 
> (I think it is a software problem since I tested it with another project. 
> There it changes when I change gain.)

Can you please be a litte bit more verbose? Where do you plug in the FFT sink? 
What do you see? What did you expect to see.

If you plug it in after the USRP block it is not a problem of the receiver, but 
here the actual signal might be hard to spot. In that case I would try 
gr-fosphor. If it is after the signal has been normalised it is obviously 
independent from the gain setting. I started a readme file with some tips (see 
github) maybe you find something interesting in there.

Bastian