wish I could help you with the radio sets, but yes the Luftwaffe radar and similiar systems was quite vast. let me see if I can find the web-link that has many of the operating systems in text form for sale. This covers more than Luftwaffe. I purchased 3-4 last year covering the FuG 216-217 sets for single seat nf's especially for my research needs.
I will say though as many are aware that the Luftwaffe really lacked the know-how of putting together a decent aerodynamic dish/radar system within the nose-cone of their nf's. Truley the English and Americans were well ahead of Germany in this respect.
The owner of many of the German manuals just may have something on the GHG. Will look through my stuff for his lists tonight....

~E