  We construct and normalise intertwining operators at the level of Hilbert
modules describing the principal series of SL(2). Normalisation is achieved
through the use of a Fourier transform defined on some homogenous space and
twisted by a Weyl element. Normalising factors are also explicitely obtained.
In the appendix we relate reducibility points to a certain distribution arising
from the non-normalised intertwiners.
