I just purchased a Hammarlund HQ-150 receiver for restoration and use
with a kit built synchronous-am detector to listen to medium and
shortwave broadcasts. By pure happenstance, it turns out that the
HQ-150 comes with an outboard unit made in the mid-1950s by Central
Electronics called a "Sideband Slicer". The "Slicer" appears to be,
among other things, some kind of unit for injecting a locally generated
and phased carrier signal into a received AM signal for improved
reception. Is anyone out there familiar with the Sideband Slicer and
how it's the same or different than today's synchronous-am detector
circuits?

- Paul