Hello I did some modifications and some measurements on this Siemens Nokia PA block.
As I got the tip from Manfred DK5FA I got 2 units.
if you follow the link you can load my modifications so far.
The document is only in German. I include also the schematics for the bias current regulation for the final LDMOS and the driver MOS. I hope this is helpful for you.
Has anyone a info about the directional coupler and the output at X102
73, Jürgen DL8SDQ