Dave,
I have two of the longer SMA F-F adapters, from two similar NanaVNA kits. I checked them on my 8753D. Both look reasonable to the 6GHz limit of my 8753D. Each shows a 900MHz through loss of about 0.07dB, and a reflection loss of about 0.3dB. A random adapter from my lab looks slightly better, but not much.
--John Gord
