Hi,
I have a N9020A MXA which maximum frequency is 26,5 GHz. I measure the carrier power around 26GHz and it is too low, that is, I would have -40dBm and I get -70dBm. I think it should be close to the power source carrier. For that, I would like to know the frequency response about this instrument to try to explain why decrease.
Could I measured by myself? or is there any file which show me it?
Best regards,
Luis
Hi,
No, I did not try it. I tried many carriers at different frequencies: 21, 22,....,26 GHz and, with the same amplitude (i.e. -30dBm), I got less amplitude when the frequency increase (-30, -35, -45.... dBm). I asked to my teacher and she proposed me that I could get the frequency response of MXA and compensate my results. I think what she told me is to do a sweep from 10Hz to 26,5Ghz to characterize the MXA and get a CSV file. However, I only have a PSG and a PNA....
Could you help me?
Best regards
Luis
Hi Luis,
If the instrument is having a frequency response issue any saved or recorded frequency response data would be useless at this point, as something would have changed in the instrument that is causing the signal loss at the high end.
What you need to do is try using the Presel Center function as I mentioned, as you may find that there is nothing wrong with the instrument other than the preselector has drifted since it was last adjusted. Just so you know, we always recommend using the Presel Center function before making any measurement above 3.6 GHz.
Regards,
Mike
Hi!
Finally I could fix some loss problems and the power is higher than before. So, I can see the power signal now. Whatever, I press Presel Center and it looks like better.
Thank you
When the signal at 26 GHz is lower than expected have you tried pressing AMPTD > Presel Center to see if that helps?
Just a thought,
Mike