clifto wrote:
David wrote:

wrote:

Are you sure about the patent cost? I thought sync detection was mostly
implemented through a PLL type circuit.

A PLL and a Product Detector


You can do without the PLL, too. You just create the signal with a
separate stage that overamplifies the signal into clipping, then
you have basically a sorta-square wave to feed into the product
detector.

That's the poor man's sync' detector. It works but it's no match for
using a PLL with sideband phase cancellation. That's what made the Drake
system so good.