Dear all,   It looks like IQ imbalance is causing problems in my application, 
as I was able to simulate real-world-like problems after adding "IQ 
Imbalance Generator" to my GRC flowgraph. So, after simulating this 
imbalance, I wanted to get rid of it with the help of "IQ Bal Optimize" 
and "IQ Bal Fix" combo. Unfortunately, I can't get it work.   As 
far as I understand, "IQ Bal Optimize" is automatically detecting 
settings (i.e. magnitude and phase correction values) for "IQ Bal Fix" 
and pass it to the latter block via message connection called 
"iqbal_corr". Is this is true, I don't understand why I have to 
manually set "Magnitude" and "Phase" in "IQ Bal Fix" 
(otherwise I cannot run the flowgraph because of empty fields). I think that 
these fields were meant for making manual fix possible, but when using "IQ 
Bal Optimize"/"IQ Bal Fix" combo, message connection should be all 
what is necessary, right? Also, because of lack of detailed documentation, I am 
not sure how to interpret "Period" field in IQ Bal Optimize - what 
units are expected here?   I am using GRC v3.7.11, compiled from source files 
few days ago.
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