On 11/18/2011 01:13 PM, Michael Black wrote:

So the solid stated direct conversion receiver came along (the concept
existed before solid state, but I don't think "direct conversion" was
used before that 1968 article by Hayward.
Actually there WAS a direct conversion receiver in QST in the 60's that
used two 6BY7's in a balanced mixer with a B&W #350 2Q4 phase shift
network. It was actually a single sideband receiver as the detector was
an image reject mixer.



Michael VE2BVW