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.
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:
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.