Mixer Level/Reference Level

I feel like I'm starting to become a regular here on the RF discussion board. I'm not sure if that's a good thing or not...
I'm making some measurements using the 5660...and the results seem unnecessarily noisy. I'm concerned that perhaps I'm not setting the "Reference Level" correctly. Could somebody clear up the definition of the mixer/reference levels? In "traditional" mixer notation, there's the RF (input) port, the LO (reference) port, and the IF (output) port. How do the 566x's define this in relation to the mixer/reference level? All of the help documents just list how the attenuation is set based on the relative levels...but it's still a bit confusing as to what I'm setting when I input a level for the "Reference Level" field, and furthermore, what the optimum level should be based on a particular application.
Brandon

Hi Brandon,
Is always good to fully understand what is going on in this field of RF (and yet it is hard to tell sometimes).
The objective is this. Whatever your signal amplitude or power level is, it better be satisfying the needs of the mixer. That is where, the mixer level comes into picture. Our goal is to bring our signal level up or down so that it meets the effective signal level.
Look at the following drawing and I hope your questions are cleared with this.
Hope this helps,
Message Edited by Yardov on 05-16-2007 12:29 AM
Gerardo O.
RF Systems Engineering
National Instruments
Attachments:
attenuation level.JPG ‏33 KB

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