Wow the less common unsaver with the awesome controller!
These keyboards are excellent, truly the pinnacle of model F engineering. Until we learned about the 4704 boards that is, Still it can be adapted to a very modern layout and many people value them even more highly than the 4704s.
Sadly they do not work with a soarer converter. A soarer converter works on ibm terminal protocol, as well as PC/XT and AT (and PS/2). It also works with a special terminal keyboard, we like to call a "bigfoot" model F, and similar converters exist for the ibm 4704 keyboard protocol also used by the "pingmaster" keyboards.
This uses the same connectors as an IBM 5083/ 5085 cad / graphics terminal. I have no idea what it was used for as it has different legends than mine. I used to have pictures of mine but I must have deleted them. I will have to take more.
Anyway, the cable is completely different than the one for that IBM 3290 plasma terminal keyboard, and the protocol is different too. You will need to replace the controller with a DPH or Xwhatsit to get it working on USB.
Alternatively use the "parak method" and just grab a spare controlelr from a 122-key model F
http://imgur.com/a/W3Hci