Spectral Mask (MB-OFDM)

A Spectral Mask makes sure a transmission stays within its band and, therefore, reduces interference by limiting excessive radiation at frequencies beyond the necessary bandwidth.

The following Spectral Mask graphic displays the 0 dBr levels at the 528MHz bandwidth, the -12 dBr levels at the 570MHz bandwidth, and the -20dBr levels at the 660MHz bandwidth. See the Band Group and Band Frequencies table for the center frequency and 0 dBr points for each Band. For example, Band Group 1 and Band 2 displays fc = 3960MHz. The red trace shows an example signal spectrum, and the blue trace the spectrum mask.

See Adjacent Channel Power Ratio Limit Testing to view an example of the Spectral Mask in comparison with a spectral signal.