Now as far as operation, here's some info that I've found....and there's not much of it online. In fact, nothing at all when it comes to circuitry or hookup.
http://www.kylebookholz.com/whct3.html
Been chatting with Doug in his Facebook TV group about it too, he's never seen one and has no info on it at all.
Figuring all of this out is going to be interesting....though it was obviously in use for a short period of time, the system remains largely a mystery.