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"Steps" in the spectrum every 10 MHz  

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Jakobster
(@jakobster)
Active Member
Joined: 9 years ago
Posts: 9
28/02/2012 7:14 pm  

Hello,

I am measuring something using near-field probes, preamp, and HF-60105. I plot the average of the sweeps and get what is depicted in the attached screenshot. How can I get rid of the "steps" in the level appearing every 10 MHz?

Regards


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Moderator
(@moderator)
Member Admin
Joined: 11 years ago
Posts: 1048
28/02/2012 8:31 pm  

These are the dBi values of the probe which change every 10MHz.
You can avoid those by using dBm instead of field strength.

Snip


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Jakobster
(@jakobster)
Active Member
Joined: 9 years ago
Posts: 9
29/02/2012 8:14 am  

But I was already measuring dBm as you can see on the vertical axis.


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Moderator
(@moderator)
Member Admin
Joined: 11 years ago
Posts: 1048
29/02/2012 3:38 pm  

You also have to remove the antenna calibration setup.

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Jakobster
(@jakobster)
Active Member
Joined: 9 years ago
Posts: 9
29/02/2012 3:57 pm  

I did not have any calibration settings set.


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Moderator
(@moderator)
Member Admin
Joined: 11 years ago
Posts: 1048
01/03/2012 9:27 pm  

In this case it is simply the noise level test which is done every 10MHz to give you more dynamic.

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