Click for my attenuator pad design tables.
Click for some UHF tools
Normal set-up: Ground -- Pins 2, 5, 6 and 7. LO -- Pin 8, IF -- Pins 3 and 4, RF -- Pin 1
RF -- Pin 1, IF -- Pin 2, Ground -- Pin 3, LO -- Pin 4.
Your return loss bridge serves double duty as a hybrid-combiner. See EMRFD.
