[Boatanchors] Mystery National Receiver, NC-127D

[fkamp at comcast.net]

Peter Markavage wrote:
> 
> Moore's book on receivers claims it's a special version of the NC-127.
> Used in experimental triple diversity system. Only one system (3
> receivers) made. Had a two position diversity control and a diversity IF
> gain control.
> Probably National didn't make a manual for it for distribution. If you
> find the other two, you'll definitely have one of a kind.
> Pete, wa2cwa

Sounds like it is already a 'one of a kind'.  Triple diversity?  What is
the third variable?

Regards,
Frank Kamp