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The results of observation in 2015, 2016 and 2017 of the sample of strong JVAS sources (S8.4 > 0.5 Jy) with flat spectra at Declination 10.5÷18 (J2000) are presented. Observations were done at frequencies 2.3, 4.7, 8.2, 11.2 and 21.7 GHz. The integral spectra of all 45 sources are defined, objects with significant variability are allocated. For eight sources observed a week-long variability, four of which were discovered for the first time (characteristic time – 8÷35 days). Spectra of the variable components were determined.