i'm curious what types of amplifiers you plan to use for the NB uplink on 2,4GHz?
I heard many would use those "spectrian" amplifiers from the USA.
My first attempt will be with an small "Andrew" amplifier with just one MRF21045.
With 500mW input power this device deliveres about 12W output.
Has anybody a idea how to build a good lowpass filter to install behind the PA?