Pure rotational spectra of several isotopomeric species of the rare gas dimers Ne-Kr and Ar-Kr have been measured using a pulsed jet cavity microwave Fourier transform spectrometer. Equilibrium internuclear distances have been evaluated by taking advantage of the isotopic data, for both these dimers and three Xe-containing dimers, whose spectra were reported earlier [Jager et al., J. Chem. Phys. 99, 919(1993)]. The dipole moments have been estimated using the "pi/2-pulse" excitation condition. Kr-83 nuclear quadrupole hyperfine structure has been observed in some rotational transitions of Ne-20-Kr-83 and of Ar-Kr-83, and the corresponding quadrupole coupling constants have been derived.