Impedance matching vs. balun

[kellogs]

As far as I can see around the internet, an impedance matching network, usually Pi, is present in radio designs. Mostly for unbalanced source and load (?).

But what about the case where there is a balanced source and unbalanced load ? To my nooby mind there ought to be one L or C series element at the source for cancelling its reactance followed by a lattice network balun for resistance transformation and nothing else. One can use a VNA to calculate both stages. Why am I not finding any such designs ?

Thank you

 

[danadak]

Part II discusses bal to unbal, attached.

 

[kellogs]

A good, back-to-the-basics read, thank you. Still can't give myself an answer though.