Looking at a PSK modulated signal, my spectrum analyzer reveals spectral lines in the nulls of the frequency spectrum. What is causing this and how can I correct it?

You may have a defective mixer, or you may be connecting the generator to the mixer incorrectly. Refer to the FAQ on mixer connections for instructions on driving a double-balanced mixer. If you still have a problem after confirming correct mixer setup, the problem may be due to code imbalance.

Refer to the FAQ on code imbalance for more information. More.

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