Measuring Harmonics

Before you start measuring harmonics, be aware you understand the Spur Free Dynamic rangeand avoid overloading the input, stay as low as possible, preferrably below -30dBm

Here are some example measurements of a 40MHz signal from various sources

First from a DDS

attachment:40mhzad9851.jpg

Second from a SI5351

attachment:40mhzsi5351.jpg

And third from a ADF4351

attachment:40mhzadf4351.jpg

The differences in harmonics and the aliases from the DDS are clearly visible.

These measurements are done with all settings on default, only the scan stop frequency is set to 250MHz.


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TinySA-Harmonics (last edited 2020-10-16 13:55:47 by RudolfReuter)