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@dlharmon what are your thoughts on direct coax-to-PCB solder connections? Any experience, good or bad? How high of a frequency is it feasible to push this sort of launch to?

I've got several applications in mind, one only needs like 2 GHz of bandwidth while the other would ideally run from DC to Ku band.

The general goal is high density multi signal probing applications using .047" micro coax and jamming them in as tight as possible. Two lanes for initial testing using a GSSG or GSGSG tip geometry. Separate 50 ohm paths usable for either a diff pair or two independent single ended signals.

Right now I'm using SMPM which is pricey (especially for duals) and also still a little bigger than I'd like.