Announcing a new Tell us what you think and help shape the future
Federal Communications Commission Logo - Click here to go to the FCC home page




Emission Designators

FCC Form 601 requests the emissions of the transmitter. Emissions are designated according to their classification and the necessary bandwidth. Three symbols are used to describe the basic characteristics of radio waves. Emissions are classified and symbolized according to the following characteristics:
  • First Symbol - type of modulation of the main carrier.
  • Second Symbol - nature of signal(s) modulating the main carrier.
  • Third Symbol - type of information to be transmitted.
Whenever the full designation of an emission is necessary, the symbol for that emission shall be preceded by the necessary bandwidth of the emission.

Designator Examples

The new International Telecommunication Union (ITU) emission designators must be used in place of the old designators. The following provides samples of the corresponding new ITU designators for the most commonly used emission designators:
Frequency modulated (FM) voice20F320K0F3E
Frequency modulated (FM) voice13.6F313K6F3E
Frequency modulated digitized voice20F3Y20K0F1E
Frequency modulated digitized non-voice20F9Y20K0F1D
Amplitude modulated single sideband voice3A3J3K00J3E
Amplitude modulated (AM) voice8A38K00A3E
If you have questions about your emission designator, you may want to contact your radio vendor or manufacturer. Also, emission designators should be included in the type acceptance paper work from the Commission. Emissions are discussed in the CFR 47, 2.201 and 90.207.
Return to Top Arrow Return To Top
Last reviewed/updated on
Emission Designators
Emission Designators - First Symbol
Type of modulation of the main carrier
Emission Designators - Second Symbol
Nature of signal(s) modulating the main carrier
Emission Designators - Third Symbol
Type of information to be transmitted