Re: [Discuss-gnuradio] IQ changing with restart

[Martin Braun]

On 11.02.2014 09:14, SOUTHCOTT, MARK A CIV USAF AFMC AFRL/RITC wrote:
> This is QPSK, and I have looked at the constellation diagram after carrier
> recovery, matched filtering and timing recovery. The constellation is a
> clean qpsk signal at that point. I've done radar work before and this
> doesn't "feel" like a phase shift from the LO (not a great reason to
> discredit it). Also, possibly due to a difference in the physical
> architecture, when I used a common clock between tx and rx in my radar work
> the initial phase alignment was repeatable.

Your const plot was before the phase recovery? And if yes, was it rotated?

MB