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We present Faraday Rotation Measure (RM) properties of seven active galacticnuclei (AGN), observed with the NRAO VLA at three epochs in 2012-2014. Data wastaken at 1.4, 2.2, 5.0, 8.2, 15.4, 22.4, 33.5 and 43.1 GHz quasi simultaneouslyin full polarization mode. For the first time RMs were calculated in a range ofwavelengths covering more than one order of magnitude: from 21 cm up to 6 mm.We measured RM for each source and showed a tendency to increase its valuetoward high frequencies according to the law |RM|~f^a with a=1.6+/-0.1. For0710+439, we observed an increase over the frequency range of 4 orders ofmagnitude and measured one of the highest RM ever, (-89+/-1)*10^3 rad/m^2.Analysis of different epochs shows variations of the value and the sign of RMon short and long time-scales. This may be caused by changing physicalconditions in the compact regions of the AGN jets, e.g. strength of magneticfield, particle density and so on.

Rotation Measures in AGN jets seen by VLA at 21 cm to 6 mm