[Discuss-gnuradio] AGC settings explanation?

[Jamin Chan]

I want to use AGC to control RF output level to be at a set value no
matter what the input level.  I see the gr.agc_cc module has the
following settings and defualt values:
rate (1e-4)
ref (1.0)
gain (1.0)
max_gain (0.0)

can somebody explain what these settings do?  I assume reference sets
the desired output level, but not sure about the other settings
thanks
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