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.
Related Questions
- Looking at a PSK modulated signal, my spectrum analyzer reveals a low carrier spectral line, much lower in magnitude than what theory would suggest. What is causing this and how can I correct it?
- Looking at a PSK modulated signal, my spectrum analyzer reveals a spectral line in the middle of the main lobe, right at the carrier frequency. What is causing this and how can I correct it?
- 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?
