I just joined the nanoVNA group a couple of days ago and followed your thread on the balun measurement. If possible, why don¡¯t you measure the scattering params, save the data, build a 3x3 scattering parameter matrix with the data and convert it to mixed signal to get the diff output? See for example . You would need one of the math software tools out there and I understand that practice and theory... have some issues to get along! but eventually they should go hand in hand. Just a suggestion.
Luciano
