Re: [Discuss-gnuradio] pll refout vs carriertracking

[Robert McGwier]

I did that on purpose.  There are myriad instances where you want the 
recovered carrier or tone but not have the complex input mixed to the 
"new zero".  If you want a recovery and baseband,  I suggest that rather 
than do an if test,  we make a new module that is track and mix.

Bob



Matt Ettus wrote:
> Bob --
>
> I think we have a problem with carriertracking -- it was supposed to 
> mix the input signal down, and output that, but it looks like it just 
> outputs the reference, like refout.
>
> Charles --
> To detect AM, you can:
>
> 1 - take output of pll_refout_cc, take its complex conjugate and 
> complex multiply that by the input signal.  The audio you want is in 
> the real output.  The imaginary output should only have noise.  If the 
> RMS value of both is about the same you don't have lock, or the signal 
> is very noisy.
>
> -OR-
>
> 2 - Fix pll_carriertracking_cc to do what I said in 1, above, since 
> that is what it was supposed to do.
>
> Matt
>
>
>
>
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