Occupied Frequency Bandwidth
Licensed commercial communications signals are allocated a specific amount of frequency spectrum, often referred to as a “channel.” The channel is defined by a regulating body, such as the ITU. Spectrum enforcement and management, Cyber and TSCM operators are often concerned with two measurements with regard to determining if a valid signal is present within a licensed spectrum. One measurement is the integrated power across the assigned channel, often called the occupied bandwidth (OBW), power-in-band, or channel power. Here the power is integrated across the channel from the assigned start to the assigned stop frequency. In RadioInspector, OBW can be calculated for the bandwidth containing from .01 to 99% of the total integrated power of the transmitted spectrum, centered on the assigned channel frequency. In addition to measuring the power in the channel, there is also a need to ensure that transmissions are not ‘spilling’ into channels assigned to other users. It may also be indicative of an illegal emitter such as a ‘rogue’ cellular base station. This test goes by many names, but it’s generically referred to as the adjacent channel power (ACP) measurement. The exact frequencies, integrated power specifications, and test methods are specified by the standards governing the transmission.
- Measuring of bandwidth and out-of-band radiators
Provides multiple bandwidth measurement results based on a variety of parameter settings and measurements to analyze interference issues, signals hiding within or close to other signals and issues impacting licensed spectrum allocation.