[GreenKeys] Mystery - Hoffman diversity FSK converter

[Nick England]

http://www.navy-radio.com/rtty/conv/hoffman-fsk-01.jpg
http://www.navy-radio.com/rtty/conv/hoffman-fsk-02.jpg

Nope - I ain't never seen one....Just a couple of glossy 8X10 photos that
came from an estate.
Looks like a pair of CV-483/URA-17 squeezed into one unit.
Does anyone remember seeing such a thing advertised or in use?
What does HMPD mean?

Nick England K4NYW
www.navy-radio.com
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