Emission in which the main carrier is amplitude-modulated (including cases where sub-carriers are angle-modulated):

A................ Double sideband.

B................ Independent sidebands.

C................ Vestigial sideband.

H................ Single sideband, full carrier.

J................. Si¡ngle sideband, suppressed carrier.

R................ Single sideband, reduced or variable level carrier.

Emission in which the main carrier is angle-modulated:

F................. Frequency modulation.

G................ Phase modulation.

D ............... Emission in which the main carrier is amplitude

modulated and angle-modulated either simultaneously or in a preestablished sequence.

Emission of pulses:

(Emissions, where the main carrier is directly modulated by a signal which has been coded into quantized form (e.g., pulse code modulation), shall be designated as either an emission in which the main carrier is amplitude-modulated, or an emission in which the main carrier is angle-modulated).

P................ Sequence of unmodulated pulses.

Symbol....... Type of Emission

A sequence of pulses:

K................ Modulated in amplitude.

L................ Modulated in width or duration.

M............... Modulated in position or phase.

Q................ Carrier is angle-modulated during the period of the pulse.

V................ A combination of the foregoing or produced by other means.

W............... Cases not covered above, in which an emission consists

of the main carrier modulated, either simultaneously or in a combination of two or more of the following modes: amplitude, angle, pulse.

X¹............... Cases not otherwise covered.

¹A full explanation for the selection of the letter X shall be provided in the Supplementary Details (SUP) unless the application is for a nondirectional beacon in the bands 190-435 and 510-535 kHz.

Symbol.......Type of Emission

0................. No modulating signal.

1................. A single channel* containing quantized or digital

signals without the use of a modulating subcarrier. (This excludes time division multi¡plex.)

2................. A single channel* containing a quantized or a

digital signal with the use of modulating subcar¡rier.

3................. A single channel* containing an analogue signal.

7................. Two or more channels* containing quantized or digital

signals.

8................. Two or more channels* containing analogue signals.

9................. A composite system with one or more channels*

containing quantized or digital signals, togeth¡er with one or more channels containing analogue signals.

X¹............... Cases not otherwise covered.

*In this context, the word "Channel(s)" refers to the radio frequency (RF) channel.

¹A full explanation for the selection of the letter X shall be provided in the Supplementary Details (SUP) unless the application is for a nondirectional beacon in the bands 190-435 and 510-535 kHz

Symbol....... Type of Emission

N................ No information transmitted.

A................ Telegraphy--for aural reception.

B................ Telegraphy--for automatic reception.

C................ Facsimile.

D................ Data transmission, telemetry, telecommand;

(the symbol D indicates that data, telemetry, or telecommand information is being transmitted individually or, that any combination of the three are being transmitted simultaneously. If any combination is being transmitted simultaneously, one of the multi¡channel symbols, 7, 8, or 9, must be used for the second symbol).

E................ Telephony (including sound broadcasting).

F................. Television (video).

W............... Combination of the above. (Use only for

multichannel systems having the capability of trans¡mitting all informa¡tion simultaneous¡ly).

X¹............... Cases not otherwise covered.

¹A full explanation for the selection of the letter X shall be provided in the Supplemen¡tary Details (SUP) unless the applica¡tion is for a nondirectional beacon in the bands 190-435 and 510-535 kHz.

Symbol....... Type of Emission

A................ Two condition code with elements of differing

numbers and/or durations.

B................ ¡Two condition code with elements of the same

number and duration without error correction.

C................ Two condition code with elements of the same

number and duration with error cor¡rection.

D................ Four condition code in which each condition

repre¡sents a signal element (of one or more bits).

E................ Multicondition code in which each condition

repre¡sents a signal element (of one or more bits).

F................. Multicondition code in which each condition

or combi¡nation of conditions represents a char¡acter.

G................ Sound of broadcasting quality (mono¡phonic).

H................ Sound of broadcasting quality (stereo¡phonic

or quadra¡phonic).

J................. Sound of commercial quality (excluding

................... categories defined for symbols K and L below).

K................ Sound of commercial quality with the use of

frequen¡cy inversion or band splitting.

L................ Sound of commercial quality with separate

frequ¡ency¡ modulated signals to control the level of demodu¡lated signal.

M............... Monochr¡ome.

N................ Color.

W............... Combination of the above.

X................ Cases not otherwise covered.

Symbol....... Type of Emission

N................ None.

C................ Code division multiplex (This includes band-

¡width expansion tech¡niques).

F................. Frequency division multiplex.

T................ Time division multiplex.

W............... Combination of frequency division multiplex and

time division multiplex.

X................ Other types of multiplexing.

Examples:

Designator Type of Emission

Non Continuous wave.

1K24F1B 1.24 kHz necessary bandwidth for frequency modulated single chan¡nel telegraphy.

16KF3EJN 16 kHz necessary bandwidth for com¡mer¡cial telephony.

1. The necessary bandwidth is the minimum value of bandwidth sufficient to ensure the transmission of information at the rate and with the quality required for the system employed. Emissions needed for satisfactory functioning of the receiving equipment (such as the carrier in reduced-carrier systems, or a vestigial sideband but not the effect of Doppler) are included in the necessary bandwidths.

2. When the full designation of an emission is required, the symbol for that emission (as given in paragraph H.2) is preceded by the number of Hertz, kHz or MHz (see examples) required for the necessary bandwidths. Bandwidths are generally expressed to a maximum of three significant digits with the third digit usually being a multiple of five.

3. To calculate the necessary bandwidths, refer to Annex J of the NTIA Manual. (This table also gives examples of the calculation of necessary bandwidths and full designation of corresponding emissions.) The necessary bandwidths can also be computed in accordance with ITU-R Recommendation SM.328. In cases in which computation is not practical, the necessary bandwidth can be obtained by measurement.

4. The value of necessary bandwidth determined by calculation or measurement should be used in designating the full emission. The necessary bandwidths so determined are not the only characteristic of an emission to be considered in evaluating the interference caused by that emission.

_{5. Further, more detailed, information on the method of calculation of necessary bandwidth is available in Annex J of the NTIA Manual of Regulations and Procedures for Federal Radio Frequency Management (current edition).}