a) Occupied bandwidth: The frequency bandwidth such that, below its lower and above its upper frequency limits, the mean powers radiated are each equal to 0.5 percent of the total mean power radiated by a given emission.

b) Necessary bandwidth: For a given class of emission, the minimum value of the occupied bandwidth sufficient to ensure the transmission of information at the rate and with the quality required for the system employed under specified conditions. Emission useful for the good functioning of the receiving equipment as, for example, the emission corresponding to the carrier of reduced carrier systems, shall be included in the necessary bandwidth.

1. The necessary bandwidth shall be expressed by three numerals and one letter. The letter occupies the position of the decimal point and represents the unit of bandwidth. The first character shall be neither zero nor K, M and G.

2. Necessary Bandwidths: between 0.001 and 999 Hz shall be expressed in Hz (letter H); between 1.00 to 999 KHz shall be expressed in KHz (letter K); between 1.00 and 999 MHz shall be expressed in MHz (letter M); between 1.00 and 999 GHz shall be expressed in GHz (letter G).

3. Examples

1 For stations authorized on or after August 16, 1995

2 Bandwidths for radio location stations in the 420-450 MHz band and for stations operating in bands subject to this footnote will be reviewed and authorized on a case-by-case basis.

3 Systems using equipment designed to operate with 25 KHz channel spacing will be authorized a 20 KHz bandwidth. Systems using equipment designed to operate with a 12.5 KHz channel spacing will be authorized a 11.25 KHz bandwidth. Systems using equipment designed to operate with a 6.25 KHz channel spacing will be authorized a 6 KHz bandwidth.

4 The maximum authorized bandwidth shall be 12 MHz for non-multilateration LMS operations in the band 909.75-921.75 MHz and 2 MHz in the band 902.00-904.00 MHz. The maximum authorized bandwidth for mutlilateration LMS operation shall be 5.75 MHz in the 904.00-909.75 MHz band; 2 MHz in the 919.75-921.75 MHz band; 5.75 MHz in the 921.75-927.25 MHz band and its associated 927.25-927.50 MHz narrowband forward link; and 8.00 MHz if the 919.75-921.75 MHz and 921.75-927.25 MHz bands and their associated 927.25-927.50 MHz and 927.50-927.75 MHz narrowband forward links are aggregated.

NOTE: The actual emmission that should be added to the license application is the emmission designation as listed on the equipment's type acceptance.  This information should be available in the technical specifications for your radios as listed by the manufacturer.

Common Emission Designators

Microwave emissions: Check with your manufacturer regarding equipment type, configuration, and throughput

Note: As most communications systems are unique, these emission designators are presented for informational purposes only. They are not intended to be a definitive guide to licensing. If you are unsure of the correct emission designator to use, consult an authoritative source familiar with your particular system and its particular configuration. When in doubt, consult your system's manufacturer. This is not intended to be an all-inclusive list. Some of the terms used in this list are trademarks of their respective manufacturers.