A table of maximum permitted spurious emission power levels is given in Appendix 3 of the ITU Radio Regulations.
The spurious emission limits are specified in the following reference bandwidths:
|frequency interval||reference bandwidth|
|9 kHz – 150 kHz||1 kHz|
|150 kHz – 30 MHz||10 kHz|
|30 MHz – 1 GHz||100 kHz|
|above 1 GHz||1 MHz|
For unlicensed short range devices, usually a measurement distance of 3 m is taken.