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8510C transmission problem

Question asked by bar28 on Oct 5, 2010
Latest reply on Oct 19, 2010 by Dr_joel
Our lab has 8510C VNA with 0.045-26.5GHz test set. What might be the problem, because S12 and S21 transmission performance is not very good from 45MHz to 60MHz? After full 2 port Type-N measurement calibration, thru measurement gives 0.02 to 0.05dB attenuation when test port connectors are together. Near 100 MHz and up 18GHz S21 and S12 values are very near at zero as it should be. Used calibration kit is 85054B and testport connectors and cables are almost new ones and changing them didn't effect for that 45-60MHz transmission issue. S11 and S22 values are almost ideal on 45-60MHz range (return loss -75dB)

All ideas are welcome.