Hi All

Rgarding its price , May be we can owne two NanoVNA's H4. , one for 50 Ohm nerworks , and the second for 75 ohm networks just with bridge modds to 75 ohm of port1. And resistors devider of port2 to have 75 ohm input impedance , May be with the same Dislord firmware, Calibration will be done with 75 ohm load obviously, then no more compromise of specific impedance , we may use a very good resistor quality as 0.5% accurate resistors and 1206 format to ensure accurate measurement and calibration stability .
73s Nizar