[Milsurplus] Need info on X-band distance measuring set

[rertman@ix.netcom.com]

OK, fellow green box fans, here's an unusual set and I'm looking for any and all
tech info I can find.

The ident plate says:

SURVEYING INSTRUMENT
DIST. MEAS.
MODEL NO. MC-8  SERIAL NNN
11-14 VDC, 22-28 VDC & 105-125 V 1 PHASE 60 CYCLES
FSN 6675-088-3652
FAIRCHILD CAMERA & INSTRUMENT CORP.
CONTRACT NO. DA-11-184-ENG-19725
US

These gadgets are X-band distance measuring units and used in pairs.  They have
several frequencies (channels) and can also provide full duplex 2-way voice
communications.

I acquired several pairs of these and would like to find tech manuals, operator's 
manuals, and accessories, such as cable sets, headsets/handsets, etc.

TIA,

Dick