 | a) Emissions are designated according to their classification and their necessary bandwidth. | |
| |
| b) A minimum of three symbols are used to describe the basic characteristics of radio waves. Emissions are classified and symbolized according to the following characteristics. | |
| | | 1. First Symbol - type of modulation of the main carrier.
2. Second Symbol - nature of signal(s) modulating the main carrier
3. Third Symbol - type of information to be transmitted. | |
| |
| c) First Symbol - types of modulation of the main carrier. | |
| | | 1.Emission of an unmodulated carrier | N |
| | | 2.Emission in which the main carrier is amplitude-modulated (including cases where sub-carriers are angle-modulated): | |
| | | | Doubled-sideband | A |
| | | | Single-sideband, full carrier
| H |
| | | | Single-sideband, reduced or variable level carrier | R |
| | | | Single-sideband, suppressed carrier | J |
| | | | Independent sidebands | B |
| | | | Vestigial sideband | C |
| | | 3. Emission in which the main carrier is angle-modulated: | |
| | | | Frequency modulation | F |
| | | | Phase Modulation | G |
| | | Note: Whenever frequency modulation "F" is indicated, Phase modulation "G" is also acceptable. | |
| | | 4. Emission in which the main carrier is amplitude and angle- modulated either simultaneously or in a pre-established sequence | D |
| | | 5. Emission of pulses: | |
| | | | Sequence of unmodulated pulses | P |
| | | | . A sequence of pulses: | |
| | | | . Modulated in amplitude | K |
| | | | . Modulated in width/duration | L |
| | | | . Modulated in Position/Phase | M |
| | | | . In which the carrier is angle-modulated during the period of pulse | Q |
| | | | . Which is a combination of the foregoing or is produced by other means | V |
| | | 6. Cases not covered above, in which an emission consists of the main carrier modulated, either simultaneously or in a pre-established sequence, in a combination of two or more of the following modes amplitude, angle, pulse | W |
| | | 7. Cases not otherwise covered | X |
| |
| d) Second Symbol - nature of signal(s) modulating the main carrier: | |
| | | 1. No modulating signal | 0 |
| | | 2. A single channel containing quantized or digital information without the use of a modulating sub-carrier, excluding time-division multiplex | 1 |
| | | 3. A single channel containing quantized or digital information with the use of a modulating sub-carrier, excluding time-division multiplex | 2 |
| | | 4. A single channel containing analogue information | 3 |
| | | 5. Two or more channels containing quantized or digital information | 7 |
| | | 6. Two or more channels containing analogue information | 8 |
| | | 7. Composite system with one or more channels containing quantized or digital information, together with one or more channels containing analogue information | 9 |
| | | 8. Cases otherwise not covered | X |
| |
| e) Third symbol - type of information to be transmitted: | |
| | | 1. No information transmitted | N |
| | | 2. Telegraphy - for aural reception | A |
| | | 3. Telegraphy - for automatic reception | B |
| | | 4. Facsimile | C |
| | | 5. Data transmission, telemetry, telecommand | D |
| | | 6. Telephony (including sound broadcasting) | E |
| | | 7. Television (video) | F |
| | | 8. Combination of the above | W |
| | | 9. Cases not otherwise covered | X |
| | | | | |
| Bandwidths: |
| | 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
| 0.002 Hz | ->H002 | | 6 KHz | ->6K00 | | 0.1 Hz | ->H100 | | 12.5 KHz | ->12K5 | | 25.3 Hz | ->25H3 | | 180.4 KHz | ->180K | | 400 Hz | ->400H | | 180.5 KHz | ->181K | | 2.4 KHz | ->2K40 | | 180.7 KHz | ->181K | | |
| | | Standard Channel Spacing/Bandwidth | |
| | | | Frequency Band ( MHz) | Channel Spacing (KHz) | Authorized Bandwidth (KHz) | | Below 25 2 | -- | -- | | 25-50 | 20 | 20 | | 72-76 | 20 | 20 | | 150-174 | 7.5 1 | 25/11.25/6 1, 3 | | 220-222 | 5 | 4 | | 421-512 2 | 6.25 1 | 25/11.25/6 1, 3 | | 806-821/851-866 | 25 | 20 | | 821-824/866-869 | 12.5 | 20 | | 896-901/935-940 | 12.5 | 13.6 | | 902-928 4 | -- | -- | | 929-930 | 25 | 20 | | 1427-1435 2 | -- | -- | | 2450-2483.5 2 | -- | -- | | Above 2500 2 | -- | -- | | |
| | | | | |
| | 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. | |
| | Example Emission Designators for the narrowband and wideband channels based upon the channel spacing in the VHF-High band, UHF and 800 MHz bands are: | |
| |
| | | VHF High-band and UHF: | |
| | | | | Analog Systems | Digital Systems | | 20K0F3E & 20K0F2D | 20K0F2E | | 11K2F3E & 11K2F2D | 8K10F1E (Phase I APCO PROJECT 25) | | 6K00F3E & 6K00F2D | 6K00F2E | | |
| |
| | | 806-821/851-866 MHz Band: | |
| | | | | Analog Systems | Digital Systems | | 20K0F3E & 20K0F2D | 20K3F2E | | | 8K10F1E (Phase I APCO PROJECT 25) | | |
| |
| | | 821-824/866-869 MHz Band: | |
| | | | | Analog Systems | Digital Systems | | 20K0F3E & 20K0F2D | 11K2F1E & 11K2G1E (APCO PROJECT 25) | | 16K0F3E & 16K0F2D | | | |
| | | | Note: These are relative examples only. Your equipment may vary. See note above. | |
