Re: [Discuss-gnuradio] USRP IQ channels flipping during packettransmission

[Don Ward]

> I have also noticed the "flipping" , but not when transmitting only when
> restarting, the signal flips 90 degree.
> but this only happens when using the subdev, when using gr.sig_source_c 
> this
> doesn't happen.
> I couldn't see why this only happens with subdev.

I had similar problems during receive.  It appears that one I or Q sample 
was getting lost so the remaining I and Q samples appeared to be reversed. 
The problem only occurred when I was using usrp._read_fpga_reg() to poll the 
rssi register.

-- Don W.