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We present new millimetre 43 GHz observations of a sample of radio-brightPlanetary Nebulae. Such observations were carried out to have a gooddetermination of the high-frequency radio spectra of the sample in order toevaluate, together with far-IR measurements (IRAS), the fluxes emitted by theselected source in the millimetre and sub-millimetre band. This spectral range,even very important to constraint the physics of circumstellar environment, isstill far to be completely exploited. To estimate the millimetre andsub-millimetre fluxes, we extrapolated and summed together the ionized gas(free-free radio emission) and dust (thermal emission) contributions at thisfrequency range. By comparison of the derived flux densities to the foreseensensitivity we investigate the possible detection of such source for all thechannels of the forthcoming ESA's PLANCK mission. We conclude that almost 80%of our sample will be detected by PLANCK, with the higher detection rate in thehigher frequency channels, where there is a good combination of brighterintrinsic flux from the sources and reduced extended Galactic foregroundscontamination despite a worst instrumental sensitivity. From the new 43 GHz,combined with single-dish 5 GHz observations from the literature, we deriveradio spectral indexes, which are consistent with optically thin free-freenebula. This result indicates that the high frequency radio spectrum of oursample sources is dominated by thermal free-free and other emission, ifpresent, are negligible.

Millimeter observations of Planetary Nebulae: a contribution to the Planck pre-launch catalogue