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We present a new solar radio imaging system implemented through the upgradeof the large single-dish telescopes of the Italian National Institute forAstrophysics (INAF), not originally conceived for solar observations.  During the development and early science phase of the project (2018-2020), weobtained about 170 maps of the entire solar disk in the 18-26 GHz band, fillingthe observational gap in the field of solar imaging at these frequencies. Thesesolar images have typical resolutions in the 0.7-2 arcmin range and abrightness temperature sensitivity <10 K. Accurate calibration adopting theSupernova Remnant Cas A as a flux reference, provided typical errors <3% forthe estimation of the quiet-Sun level components and for active regions fluxmeasurements.  As a first early science result of the project, we present a catalog of radiocontinuum solar imaging observations with Medicina 32-m and SRT 64-m radiotelescopes including the multi-wavelength identification of active regions,their brightness and spectral characterization. The interpretation of theobserved emission as thermal bremsstrahlung components combined withgyro-magnetic variable emission pave the way to the use of our system forlong-term monitoring of the Sun. We also discuss useful outcomes both for solarphysics (e.g. study of the chromospheric network dynamics) and space weatherapplications (e.g. flare precursors studies).

Solar observations with single-dish INAF radio telescopes: continuum imaging in the 18-26 GHz range