I have a CU-284/UR antenna coupler that I am working on (I plan to use it to split my AN/URC-9 and my AN/URR-35C.
Literature is pretty thin on this item so I figured I would reach out and see if anyone had the publication laying around and would be willing to send it in to get scanned or perhaps sell it.
Here is what it looks like (Courtesy of Nick at
Navy-Radio.com). It’s a pretty simple device using two cavities but I always like to have the manual so I have the specific adjustment specifications.