[Milsurplus] First post - not

[CL in NC]

Hello all.  Been reading the mail on milsurp for a long time, but never been able to post, so reapplied to the group trying this email,  instead of my ARRL .net  forwarder.  Brian, KN4R was posting stuff for me.

Does anybody have info or schematics for a Sparks-Witnington   "Receiver-Miniature  Radio Range (Automatic) Type M-1"  ?  The description is exactly how the name plate is worded.  It's a tunable VLF rig with a large Cannon socket on the right side, unusual RF input on the left, and one octal socket on the right side of the back and what somewhat resembles a cloths dryer 230 volt socket on the left, but the size of an octal.

Charlie, W4MEC in NC