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Yebes 40\,m radio telescope is the main and largest observing instrument atYebes Observatory and it is devoted to Very Long Baseline Interferometry (VLBI)and single dish observations since 2010. It has been covering frequency bandsbetween 2\,GHz and 90\,GHz in discontinuous and narrow windows in most of thecases, to match the current needs of the European VLBI Network (EVN) and theGlobal Millimeter VLBI Array (GMVA). Nanocosmos project, a European Unionfunded synergy grant, opened the possibility to increase the instantaneousfrequency coverage to observe many molecular transitions with single tunningsin single dish mode. This reduces the observing time and maximises the outputfrom the telescope. We present the technical specifications of the recentlyinstalled 31.5-50 GHz (Q band) and 72-90.5 GHz (W band) receivers along withthe main characteristics of the telescope at these frequency ranges. We haveobserved IRC+10216, CRL 2688 and CRL 618, which harbour a rich molecularchemistry, to demonstrate the capabilities of the new instrumentation forspectral observations in single dish mode. The results show the highsensitivity of the telescope in the Q band. The spectrum of IRC+10126 offers asignal to noise ratio never seen before for this source in this band. On theother hand, the spectrum normalised by the continuum flux towards CRL\,618 inthe W band demonstrates that the 40~m radio telescope produces comparableresults to those from the IRAM 30~m radio telescope, although with a smallersensitivity. The new receivers fulfil one of the main goals of Nanocosmos andopen the possibility to study the spectrum of different astrophysical mediawith unprecedented sensitivity.

Yebes 40 m radio telescope and the broad band NANOCOSMOS receivers at 7 mm and 3 mm for line surveys