ARRL Letter Mailing List wrote:
Rapp's remarkable contributions
spanned a period of more than three decades (1941-1962, 1972),

I remember an article, probably April '55, where
Rapp described a method of "amplitude discrimination".
If one used such a method, one could simply tune
in the weak signal by tuning out the strong ones.
Such amplitude discrimination required "back to
back limiters". When I asked my Elmer, W5OLV, how
to build a "back to back limiter", he couldn't stop
laughing.
--
73, Cecil http://www.w5dxp.com