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Re: [Discuss-gnuradio] pll_refout_cc - finding optimum alpha & beta ??

From: Charles Swiger
Subject: Re: [Discuss-gnuradio] pll_refout_cc - finding optimum alpha & beta ??
Date: Fri, 17 Mar 2006 14:46:34 -0500

On Fri, 2006-03-17 at 10:16 -0800, Eric Blossom wrote:

> The function has the right name, mod_2pi, but the wrong implementation ;)
> These are commonly called bugs ;)  Hence my comments above about doing the
> mod the right way.

Roger that. Plowing right ahead with a hacked 1st order PLL filter,
here's a screenshot of Sync AM detection rev 1.0, suprisingly works:


the carrier at 7.5k in the upper screen (Voice of Turkey) bounces
between 15 and 30db, while the phase locked, filtered and scaled one in
the bottom is nailed at 20db. Convert to real and mix yeilds audio.

There must be a trivial way to change +7.5kHz to -7.5kHz so we can use
complex mixing...


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