U403: change from 74LVC2G125 to 74LVC2G126 The two parts have the same footprint and pinout, but '126 3-state buffers have active-high OE inputs instead of active-low. The change is purely for software benefit: having GPIO 11/12 set to 1 correspond to that current contribution being enabled will be much more intuitive for developers and tinkerers.

/* RF Tx path from Rita to PA, low bands */

module rfmatch_rita2pa_lb (In, Out, GND);

input In;
output Out;
input GND;

wire mid1, mid2;

inductor L601 (In, mid1);
capacitor C655 (mid1, mid2);
chip_attenuator R600 (mid2, Out, GND, GND);

endmodule