Document ID: chunk:federal_register_of_legislation:F2020L01451:reg:9
Version: federal_register_of_legislation:F2020L01451
Segment Type: reg
Provision Reference: reg 9
Character Range: 13898–15742

9  Out-of-band interference
 (1) Out-of-band interference is difficult to predict because the levels and frequencies of unwanted emissions depend on both the nearness of, and the operating frequencies of, radiocommunications transmitters and radiocommunications receivers. In addition, out-of-band interference:
(a) can extend for many megahertz either side of the frequency boundary of a spectrum licence;
(b) is dependent on the quality of the radiocommunications receiver as well as the levels of the radiocommunications transmitter emission; and
(c) is difficult to model accurately.
 (2) If emission limits were used to manage out-of-band interference for devices in close proximity, the interference modelling inaccuracy would require large probability margins to be added to those limits. These margins would place severe constraints on use of the spectrum because the frequency boundaries of a licence extend throughout the entire geographic area of a licence. Therefore, emission limits that manage out-of-band interference throughout the geographic area of a spectrum licence cannot be used because they would lead to a severe loss of utility of the spectrum on both sides of the frequency boundary.
 (3) Instead of making large tracts of spectrum space unusable through the imposition of emission limits, out-of-band interference is managed through interference management procedures based on a compatibility requirement for radiocommunications receivers. A minimum level of receiver performance is specified in conjunction with the compatibility requirement because the performance level of receivers:
(a) affects the level of interference; and
(b) can vary for receivers operating under spectrum licences.
Note: The minimum level of receiver performance is specified in Part 4. The compatibility requirement is set out in Part 5.