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[Discuss-gnuradio] Costas loop lock?

From: tom sutherland
Subject: [Discuss-gnuradio] Costas loop lock?
Date: Thu, 10 Oct 2013 18:30:40 -0700 (PDT)

I am using a Costas loop for carrier recovery with QAM16 data. The carrier is only 2khz. The I/Q output of the Costas loop seems to track (the original sin/cos of the modulating carrier's Frequency & Phase) steadily for a long period (minutes) and then the Phase moves off, normally in +/-  45 or 90 degrees in one or both of the phases.  Any thoughts on why this occurs or how I can fix this issue?

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