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PNA-X - vector calibration turn off when switching high /low band mode

Question asked by mirek on Jun 10, 2015
Latest reply on Jun 12, 2015 by Dr_joel
I notice  when I switch high /low  band mod (source filtered or not) the vector calibration is turn off. Why is that.
Changing the band mode do not really effect anything between reference couplers and measurement couplers. Only source power is effected, but vector calibration should not be. Any reason for that?
I see that behavior in firmware A.09.90.13 under windows XP