Input impedance at UFL-R connector.
The datasheets say that AMPORT2 impedance on the radio chip is 75 ohms, but no spec is given for the MGA-68563 LNA chip.
...and so then:
(1) I'm thinking therefore that the answer is 75 ohms but perhaps it's transformed to 50 by or is different for each input filter?
(2) The input filters would have had to be designed with a specific source impedance in mind and I wonder what that is for each band?