"Michael Black" wrote in message
ample.net...
By going back to the
beginning, he was able to introduce some new concepts in superregen, which
would never come up based on most of the descriptions of the receiver.

Another good area to start off with is crystal sets, from an era when they
had to be sensitive and serious receivers as they were all there was.

For SSB, CW and improved AM reception you add a 1 transistor VFO/BFO, which
amongst other things brings up the sensitivity.

There's a video demo of this he
http://www.youtube.com/watch?v=ihLbcaOvhiA

I would use this as your baseline for comparison with regenerative and
direct conversion. The 'amplified crystal set' approach doesn't have the
frequency pulling problems that regen sets can have.

Peter