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@All
Thank you for the valuable input.

@Roger , for the nice links to schematic & More specific groups.

@gfmucci for the "Static warning"

@Jim & Zack for the "Don't connect the FT-991A directly to the VNA" :-)
Ps: Jim i finally got a HP 5065A ... :-)

@Dave For that "invaluable tip, about the coax , and the finger/screwdriver" .. I didn't think about this one.

Rgds
Carsten