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An emission designation is of the form BBBB 123 45, where BBBB is the bandwidth of the signal, 1 is a letter indicating the type of modulation used, 2 is a digit representing the type of modulating signal, 3 is a letter corresponding to the type of information transmitted, 4 is a letter indicating the practical details of the transmitted information, and 5 is a letter that represents the method of multiplexing. The 4 and 5 fields are optional.
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Designation details
Bandwidth
The bandwidth is expressed as three digits and a letter that occupies the position normally used for a decimal point. The letter indicates what unit of frequency is used to express the bandwidth. H indicates Hertz, K indicates kilohertz, M indicates megahertz, and G indicates gigahertz. For instance, "500H" means 500 Hz, and "2M50" means 2.5 MHz.
| N | Unmodulated carrier |
| A | Double-sideband amplitude modulation (AM broadcast radio) |
| H | Single-sideband with full carrier (used by CHU) |
| R | Single-sideband with attenuated carrier |
| J | Single-sideband with no carrier (Shortwave utility and amateur stations) |
| B | Two sidebands containing different signals |
| C | Vestigial sideband (e.g. NTSC) |
| F | Frequency modulation (FM broadcast radio) |
| G | Phase modulation |
| D | Combination of AM and FM or PM |
| P | Sequence of pulses without modulation |
| K | Pulse amplitude modulation |
| L | Pulse width modulation (used by WWVB) |
| M | Pulse position modulation |
| Q | Sequence of pulses, phase or frequency modulation within each pulse |
| V | Combination of pulse modulation methods |
| W | Combination of any of the above |
| X | None of the above |
| 0 | No modulating signal |
| 1 | One channel containing digital information, no subcarrier |
| 2 | One channel containing digital information, using a subcarrier |
| 3 | One channel containing analogue information |
| 7 | More than one channel containing digital information |
| 8 | More than one channel containing analogue information |
| 9 | Combination of analogue and digital channels |
| X | None of the above |
Type of transmitted information
| N | No transmitted information |
| A | Aural telegraphy (Morse code) |
| B | Electronic telegraphy (Radioteletype and digital modes) |
| C | Facsimile (Still images) |
| D | Telemetry or Telecommand (Remote control) |
| E | Telephony (voice or audio signals) |
| F | Video (television signals) |
| W | Combination of any of the above |
| X | None of the above |
| A | Two-condition code, elements vary in quantity and duration |
| B | Two-condition code, elements fixed in quantity and duration |
| C | Two-condition code, elements fixed in quantity and duration, error-correction included |
| D | Four-condition code, one condition per "signal element" |
| E | Multi-condition code, one condition per "signal element" |
| F | Multi-condition code, one character represented by one or more conditions |
| G | Monophonic broadcast-quality sound |
| H | Stereophonic or quadraphonic broadcast-quality sound |
| J | Commercial-quality sound (non-broadcast) |
| K | Commercial-quality sound—frequency inversion and-or "band-splitting" employed |
| L | Commercial-quality sound, independent FM signals, such as pilot tones, used to control the demodulated signal |
| M | Greyscale images or video |
| N | Full-color images or video |
| W | Combination of two or more of the above |
| X | None of the above |
| N | None used |
| C | Code-division (excluding spread spectrum) |
| F | Frequency-division |
| T | Time-division |
| W | Combination of Frequency-division and Time-division |
| X | None of the above |