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PNA N5224A - Noisy signal above 20 GHz

Question asked by nabj on Nov 3, 2015
Latest reply on Nov 7, 2015 by jvall
I am getting a significantly higher noise level beginning at just below 20GHz. I have tried doing a fresh calibration, but it doesn't go away. It doesn't matter what sample I'm measuring. It's been like this for a while, but it's perfectly consistent and I'm sure I didn't get this before...

The attached image is an example. It is the change in S12 in dBm from a previous reference sweep, averaged over 5 sweeps. Has anyone seen before or know what I can do about it? Sorry if it's super obvious, but I haven't been able to figure it out.


Edited by: Nabj on Nov 3, 2015 12:18 PM