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A sample of classical IntraDay Variable (IDV) and IDV candidate sources hasbeen monitored with the Urumqi 25m telescope and the Effelsberg 100m telescope.Aim of the project is to investigate the origin of IntraDay Variability, aphenomenon which has been observed in about 30% of flat spectrum radio quasars.Simultaneous Effelsberg-Urumqi observations demonstrated that the Urumqiantenna, although relatively small in diameter, is well suitable for IDVexperiments. A few Urumqi datasets, however, turned out to be affected by aspurious $\sim 24$ hours modulation, an effect which has been removed by meansof a new procedure for data reduction. In about 14 months, 12 epochs ofobservation have been collected, for a total observing time of more than 45days. The epochs are regularly distributed over the whole year, in order tocheck for the presence of systematic annual changes in the variability timescales - a crucial test for verifying the consistency of source-extrinsicmodels of the variability. Preliminary time-analysis of the monitored sourcesrevealed some hint for a slowing down of the characteristic time scales ofS5~0716+714, a result that, if confirmed, would be compatible with asource-extrinsic origin of the variability, in contrast to previous IDVstudies. No significant modulation of the time scales has been detected forS4~0954+658.

Observations of IntraDay Variable sources with the Effelsberg and Urumqi Radio Telescopes