Hello all,

When using pll_carriertracking_cc, the returned spectrum seems to be
inverted about 0MHz, when looking though the code line 113 of
gr-analog/lib/pll_carriertracking_cc_impl.cc
looked odd:

> optr[i] = iptr[i] * gr_complex(t_real, -t_imag);

could someone explain why the the imaginary component of the NCO is
inverted?

Thank you all,
Andrew
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