Technical Standards for Broadcast Service

Technical Standards for Broadcast Service Technical Unit 12/19/2013

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Table of Contents 1. Introduction .......................................................................................................................................... 3

2. Scope 3

3. Acceptability of Equipment ................................................................................................................... 4

3.2. Equipment Labels .......................................................................................................................... 4

3.3. Engineering Guidelines ................................................................................................................. 4

3.3.1. Access to Transmission Equipment: ...................................................................................... 4

3.3.2. Metering and Monitoring: .................................................................................................... 5

3.3.3. Environmental and Reliability Requirements: ...................................................................... 5

4. Sound Broadcasting Systems using Amplitude Modulation ................................................................. 5

4.1. Technical Standards for Signal Transmission and Reception. ............................................. 5

4.2. AM Broadcast Channel .............................................................................................................. 5

4.3. Types of AM Stations................................................................................................................. 5

4.4. Minimum Antenna Height ............................................................................................................ 6

4.5. Ground System .............................................................................................................................. 6

5. Sound Broadcasting System Using Frequency Modulation .................................................................. 7

5.1. Technical Standards for Signal Transmission and Reception ........................................................ 7

5.2. Transmission System Standard ..................................................................................................... 7

5.3. Minimum Distance Separation Between Transmitters ................................................................. 7

5.4. Transmitter Location ..................................................................................................................... 8

5.5. Channels ........................................................................................................................................ 8

5.6. Type of Emissions .......................................................................................................................... 8

5.7. Limits of Modulation ..................................................................................................................... 8

5.8. Carrier Frequency Adjustment ...................................................................................................... 8

5.9. Phase to Phase Loading ................................................................................................................ 9

5.10. RF Carrier Performance Rating ................................................................................................. 9

5.10.1. Power Output rating ............................................................................................................. 9

5.10.2. Carrier Frequency Stability .................................................................................................... 9

5.10.3. Spurious Emissions ................................................................................................................ 9

5.10.4. Cabinet Radiation ................................................................................................................ 10

5.11. FM STEREOPHONIC SOUND TRANSMISSION STANDARD ................................................... 10

5.12. Radio Broadcast Data System ................................................................................................. 12

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5.12.1. Modulation of the Data Channel ........................................................................................ 12

5.13. Studio to Transmitter Links (STL) ............................................................................................ 12

6. Community Radio Service ................................................................................................................... 14

6.1. General Considerations ............................................................................................................... 14

7. Technical Standards for Conventional Analogue Television Broadcast Transmission and Reception 14

7.1. National Television System Committee (NTSC) .......................................................................... 14

7.1.2. Standards ............................................................................................................................ 15

7.1.3. Summary of Technical Details ............................................................................................. 16

7.1.4. Channel Assignment: .......................................................................................................... 16

8. Technical Standards for Subscriber Television Signal Transmission and Reception ........................... 17

8.1. Standards .................................................................................................................................... 17

8.2. Prohibited Frequencies ............................................................................................................... 17

8.3. Technical Parameters for Transmission via Cable ...................................................................... 18

8.3.2. Frequency Separation Standards ........................................................................................ 21

8.4. Channel Allocation Plan For Subscriber Television ..................................................................... 23

Glossary 26

References 26

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1. Introduction

1.1. This Technical Standards for Broadcasting Service have been developed under the authority of

The National Telecommunications Regulatory Commission (The Commission) and represents a

compilation of the minimum technical standards for the transmission and reception of signals

within specified broadcast services.

1.2. Under the Telecommunications Act [No. 27 of 2000], broadcasting is defined as the

"transmission of radio or video programming to the public on a free, pay, subscription, or other

basis, whether by cable television, terrestrial, or satellite means, or by other electronic delivery

of such programming. The broadcasting service comprises transmissions that are generally

intended to be received directly by the public. Broadcast transmissions generally consist of

sound or vision programmed signals, however broadcasters may embed control signals for

network control and maintenance within the transmissions. As articulated in Article 23 of the

ITU Radio Regulations, the establishment and use of broadcasting stations (sound broadcasting

and television broadcasting stations) on board ships, aircraft or any other floating or

airborne objects outside national territories is prohibited.

1.3. The regulatory treatment of the broadcast service required under the Telecommunications

Act, is specific to the technical aspects of the network and the Commission is precluded from

regulating programme content or scheduling. Persons engaged or desirous of operating a

broadcast network must be licensed to do so. The broadcasting networks licence is the license

required for broadcast operations and has been classified as a class license and authorizes

persons to engage in the transmission of signals.

2. Scope

2.1. These standards define the minimum technical requirements for transmitting

equipment/systems to be used in the broadcasting services for transmission and reception of

signals.

2.2. Broadcasting Services include both analogue and digital technologies as both cable and radio

frequency spectrum medium. These standards are directed specifically to AM Broadcasting

Service, VHF Sound Broadcasting using FM, Conventional Analogue Television Broadcasting,

and Subscriber Television service. These standards are industry standards applicable to

equipment which are operating or intended for use in Saint Lucia.

2.3. The standards specifies among other things: a) The acceptability of equipment;

b) Engineering guidelines; and

c) The technical parameters of the transmission aspects of broadcast networks.

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2.4. In the event of any inconsistencies between this document and the Telecommunications

Act or its Regulations, the provisions stipulated in the Act or applicable Regulations shall take

precedence.

3. Acceptability of Equipment

3.1. Equipment intended for use in the broadcast service must be granted Type Approval certification

by the Commission, in lieu of this, relevant test results to indicate adherence to Radio Standards

Specifications (RSS) and Interference Causing Equipment Standard (ICES). The Commission

reserves the right to require adjustments to be made to the equipment should it cause interference

notwithstanding having been prior certification. Any significant change made to the design,

circuitry or operation of the equipment, other than for the replacement/repair of defective

parts, will void the certification unless notice is provided to the Commission and approval is

granted by the Commission.

3.2. Equipment Labels

3.2.1. All broadcasting equipment with Type Approval certification must be permanently

labeled. The label must contain the following:

a) The manufacturer's name or brand name;

b) The model identification;

c) The serial number; and

d) The Type Approval Reference identification. In lieu of Type Approval

identification the relevant specification tests (approved by the NTRC) should be

used.

3.2.2. The identification label must be affixed permanently so that the above information can be

seen throughout the operational life of the equipment.

3.3. Engineering Guidelines

3.3.1. Access to Transmission Equipment:

All appropriate precautions should be enacted to prevent unauthorized access to any

controls and adjustments which, if accessed, might result in noncompliance with the

technical operational terms/standards specified in the Licence. Depending on the

transmitter housing facility and its vulnerability, the broadcaster may have to enact

certain measures such as: control of entry unto the premise; physical protection of

adjustments; need for and control of specialist tools to make adjustments; etc.

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3.3.2. Metering and Monitoring:

The transmission equipment must incorporate a suitable meter indicating, or uniquely

related to the RF output power. Regular (annually) checks and monitoring will be

conducted by the NTRC of the transmission equipment/system.

3.3.3. Environmental and Reliability Requirements:

Compliance with the equipment manufactures recommendations for the operational

temperature range and relative humidity should be adhered to. The broadcaster may be

required to put in the necessary air conditioning and temperature regulation system to

ensure proper functioning of the equipment/systems. The broadcast should apply sound

engineering practice throughout, including that:

I. The transmission equipment/system should be designed such that it will not suffer

damage when operated continuously especially in the case of Radio Frequency

transmitters.

II. Precautions should be taken to prevent switching or commutation spikes from being

radiated or superimposed upon the incoming supply.

III. Sufficient space should be provided adjacent to transmission equipment for location

of the test equipment required to monitor and measure the parameters of

transmission.

4. Sound Broadcasting Systems using Amplitude Modulation

4.1. Technical Standards for Signal Transmission and Reception. The standards contained in this chapter are the conditions necessary for the

establishment of sound broadcasting in the Medium Wave (AM) band.

4.2. AM Broadcast Channel The band of frequencies occupied by the carrier and the upper and lower sidebands of an

AM broadcast signal with the carrier frequency at the center. Channels are designated by

their assigned carrier frequencies. The 117 carrier frequencies assigned to AM broadcast

stations begin at 540 kHz and progress in 10 kHz steps to 1700 kHz.

4.3. Types of AM Stations Generally there are recognized four classes of AM broadcast stations:

1) Class A

2) Class B

3) Class C and

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4) Class D

4.3.1. A Class A station is an unlimited time station (that is, it can broadcast 24 hours per day) that

operates on a clear channel. The operating power shall not be less than 10 kilowatts (kW) or

more than 50 kW.

4.3.2. Class B .station is an unlimited time station. Class B stations are authorized to operate with

a minimum power of 0.250 kW (250 watts) and maximum power of 50 kW. (If a Class B

station operates with less than 0.250 kW, the RMS must be equal to or greater than 141

mV/m at 1 km for the actual power.) If the station is authorized to operate in the expanded

band (1610 to 1700 kHz), the maximum power is 10 kW.

4.3.3. A Class C .station is an unlimited time station that operates on a local channel. The power

shall not be less than 0.25 kW or more than 1 kW. Class C stations that are licensed to

operate with 0.100 kW may continue to operate as licensed.

4.3.4. A Class D .station operates either daytime, limited time, or unlimited time with a night time

power less than 0.250 kW and an equivalent R.MS antenna field less than 141 mV/m at 1

km for the actual power. Class D stations shall operate with daytime powers not less than

0.250 kW or more than 50 kW. NOTE: If a station is an existing daytime-only station, its

class will be Class D.

4.4. Minimum Antenna Height

4.4.1. For stations providing primary service the minimum antenna height must ensure a field

strength of2R2mV/m@ 1km for 1KW station.

4.4.2. Ground wave signal strength required to provide primary service shall be maintained at 2

mV /m for communities with population greater than 2500 persons. For population

less than 2500 persons, the signal strength shall be maintained at a level of 0.5mV/m or less.

4.5. Ground System 4.5.1. Ground system shall consist of buried radial wires at least a quarter of wavelength in length

evenly spaced and should be not be less than 90 but ideally 120 at 0.35 of a wavelength to

0.4 of a wavelength in length.

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5. Sound Broadcasting System Using Frequency Modulation

5.1. Technical Standards for Signal Transmission and Reception

5.1.1. Sound Broadcast System utilizing Frequency Modulation (FM) is a transmission technology

that uses the technique of frequency modulation to emit audio signals (in most cases stereo)

within the VHF band.

5.1.2. The standards contained in this chapter are the conditions necessary for the establishment

of sound broadcasting using FM and relates to the transmission parameters of

transmitters as well as the necessary levels of signal reception.

5.2. Transmission System Standard

5.2.1. Broadcasting equipment utilizing FM consist of all the apparatus necessary to convert

the modulating input signal to a frequency modulated carrier at the center frequency of a

standard channel in the frequency range 88 MHz to 108 MHz

5.2.2. Transmitters will be authorized for power levels which will provide the minimum accepted

field strength of 70 dBV/m or 3.16 mV/m but shall not exceed 500W transmitter power1

and an ERP of 30dBW(1 kW).

5.2.3. The transmitter should not be linked directly to the antenna system, it is highly

recommended that the transmitter or the output stage of the transmitters be equipped

with a filtering device.

5.3. Minimum Distance Separation Between Transmitters

5.3.1. Table 5.3 demonstrates the minimum distance of separation for transmitters of VHF Sound

Broadcasting Service using FM.

Channel Separation Between Transmitters/kHz Minimum Distance for Separation/km

0 40

200 27

400 13

600

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5.4. Transmitter Location

5.4.1. The Location of the transmitter must be so chosen that on the basis of the effective radiated

power and antenna height above average terrain (HAAT) employed, a minimum of 70 dB

above 1 V/m (dB) or 3.16mV/m is provided over the service area. The transmitter

location must ensure that the 1mV/m contour encompasses the population center that is

being served. Also the co-location of broadcast transmitters and aeronautical radio

communications equipment operating in the VHF range is strongly discouraged.

5.5. Channels

5.5.1. The transmitter shall operate within the range 88 MHz to 108 MHz, however note that the

frequency range 88.1 MHz to 89.5 MHz is reserved for Community Radio Broadcast

service. The recognized operating channels or frequencies shall be of channel separation of

200 kHz. In Saint Lucia the sub bands channel assignments are recognized as the odd

multiple assignments, i.e. 96.1 MHz, 96.3 MHz, 96.5 MHz, etc.

5.6. Type of Emissions

5.6.1. The designation of modulation and emission refer to the manner in which the carrier is

modulated and transmitted. The transmitting equipment shall produce F3EGN emission for

monophonic operation and F8EHF emission for stereophonic operation. The

transmitting equipment shall be capable of operating with a frequency deviation of 75

kHz, which is equivalent to 100% modulation.

5.7. Limits of Modulation

5.7.1. Emissions shall not exceed 100 percent modulation except for the following

conditions:

a) FM multiplex sub carrier using any modulation may operate if the multiplexed

sub carrier and their sidebands are maintained within the range 20 kHz to 99 kHz.

b) Total peak modulation may be increased 0.5% for each 1.0% sub carrier injection

modulation.

5.8. Carrier Frequency Adjustment

5.8.1. The transmitting equipment shall be capable of operation in accordance with these

standards on any channel in the specified carrier frequency range without change in

construction other than changing frequency determining components.

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5.9. Phase to Phase Loading

5.9.1. The transmitting equipment, if rated above 10kVA, shall present a balanced load to the AC

mains such that the current in each phase shall be 10% of the average of all three currents.

5.10. RF Carrier Performance Rating The following technical parameters are adapted from ITU-R Recommendation ITU-R

BS.4503 and the technical parameters of the FM Radio broadcast network licence.

5.10.1. Power Output rating

5.10.1.1. The standard rating of power output for the transmitting equipment shall be as

specified by the individual manufacturer. The transmitting equipment shall be

capable of being adjusted to deliver the power output when the AC input voltage

varies by 5% from the rated value.

5.10.2. Carrier Frequency Stability

5.10.2.1. The frequency of the carrier shall remain within 1000 Hz of the mean test

frequency.

5.10.3. Spurious Emissions

5.10.3.1. A spurious emission from any part of the installation other than the antenna and

its transmission line shall not have an effect greater than would occur if the antenna

system were supplied with the maximum permitted power at that spurious emission

frequency. Spurious emissions of the transmitting equipment shall not exceed the

values given in Table 5.10.3.

Spurious Emissions Maximum Value

Between 120 kHz and 240kHz from the

carrier frequency.

-25dB2

More than 240 kHz and up to and

including 600 kHz from the carrier

frequency

-35dB2

More than 600 kHz from the carrier

frequency whichever is the stronger

-(43 +10 logP)' or 80dB' P= power in watts

Table 5.10.3 illustrating maximum value of spurious emissions

2 Refers to the power level of the unmodulated carrier

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5.10.4. Cabinet Radiation

5.10.4.1. Emissions at any frequency shall be at least 54 dB below the calculated field

strength reference level.

5.11. FM STEREOPHONIC SOUND TRANSMISSION STANDARD

5.11.1. A FM broadcast station shall not use 19kHz 20Hz, except as the stereophonic pilot

frequency in a transmission system meeting the following criteria:

a) The modulating signal for the main channel consists of the Left and Right

signals;

b) The pilot sub-carrier at 19 kHz 2Hz shall frequency modulate the main carrier

between the limits of 8 and 10 percent;

c) One stereophonic sub-carrier shall be the second harmonic of the pilot sub-

carrier (that is, 38 kHz) and shall cross the time axis with a positive slope

simultaneously with each crossing of the time axis by the pilot sub-carrier

which are not precluded;

d) Double sideband, suppressed carrier amplitude modulation of the

stereophonic sub-carrier at 38 kHz shall be used;

e) The stereophonic sub-carrier at 38 KHz shall be suppressed to a level less than 1

%of the main carrier;

f) The modulating signal for the required sub-carrier shall be equal to the difference

of the left and right signal;

g) The applicable modulating levels:

I. when a signal exists in only one channel of a two channel (biphonic) sound

transmission, modulation of the carrier by audio components shall not exceed

45%, and modulation of the carrier by the sum of the amplitude modulated sub-

carrier in the base band range of 23 kHz to 53 kHz shall not exceed 45%;

II. when a signal exists in only one channel of a stereophonic sound transmission

having more than one stereophonic sub-carrier in the base band, the modulation

of the carrier by audio components within the audio base band range of 23 kHz

to 99 kHz shall not exceed 53%

III. a station not transmitting stereo with a method described above shall limit the

main carrier deviation caused by any modulating signals to occupying the band 19

kHz 20Hz to 125Hz.

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5.11.2. All stations, regardless of the stereophonic transmission shall not exceed the

maximum modulation limits of 100 % on peaks on frequency recurrence to 75 kHz

deviation. Stations providing subsidiary communications services using subcarrier

standards concurrently with the broadcasting of stereophonic or monophonic

programs may increase the peak modulation deviation as follows:

a) the total peak modulation may be increased 0.5% for each percent subcarrier

injection modulation;

b) the modulation shall not exceed 110 per cent (82.5 kHz peak deviation).

5.11.3. FM stations operating with transmitter power greater than 10 Watts are to maintain the

operating power within 90% and 110% of that authorized.

5.11.4. Departure of the carrier or center frequency of an FM station with an authorized power

greater than 10 Watts may not deviate more than 2000 Hz from the authorized

carrier.

5.11.5. The audio frequency distortion including all harmonics up to 30 kHz shall not exceed

1% in the range of frequencies from 50 Hz to 15 000 Hz.

Figure 5.11: Illustrating FM Stereographic signal

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5.12. Radio Broadcast Data System

5.12.1. Modulation of the Data Channel

5.12.1.1. Radio Broadcast Data System or, Radio Data System, is a communications

protocol standard for transmitting small amounts of digital information using

conventional FM Sound Broadcast techniques. The RBDS system enables the

transmission of several types of information transmitted, including station

identification, automatic or assisted tuning functions of an FM receiver, weather

and traffic reports, time, track/artist information, etc.

5.12.1.2. The system uses a 57 kHz subcarrier to carry data at 1187.5 bits per second (

0.125 bit/s), locked in phase or in quadrature to the third harmonic of the 19 kHz pilot

tone.

5.12.1.3. Sub-carrier level: the recommended nominal deviation of the main FM

carrier due to the modulated sub-carrier is 2 kHz. The decoder should, however,

be designed to work with sub-carder levels corresponding to between 1 kHz and

7.5 kHz deviation.

5.12.1.4. Method of modulation: the sub-carrier is amplitude-modulated by the shaped and

biphase-coded data signal. The sub-carrier is suppressed (see Figs. la) to 1c)).

5.13. Studio to Transmitter Links (STL)

5.13.1. Under the terms of the FM broadcast licence, the use of VHF broadcast frequencies (88-

108MHz) for the rebroadcast of programme is not permitted. The operators are encouraged

to use a studio to transmitter link in the UHF band (335.4 MHz to 399.9 MHz).

5.13.2. A studio-transmitter link (or STL) emits an audio signal from the studio to the transmitter

at another location which is usually placed at a high-site. STL is a point to point link and

STL transmitters are restricted to 15W (erp) and the antenna must be directional. The

channel spacing is restricted to 500 kHz.

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6. Community Radio Service

6.1. General Considerations

6.1.1. By virtue that Community Radio Service is part of the Sound Broadcasting Service

using FM, the technical characteristics are similar, the exceptions are specified below:

I. Transmitters will be authorized for power levels which will provide the minimum accepted

field strength of 70 dBV/m (3.16mV/m) but shall not exceed 25W transmitter power and

an ERP 10dBW.

II. The channels for Community Radio Service arc restricted within the band 88.1MHz to

89.5MHz

7. Technical Standards for Conventional Analogue Television Broadcast Transmission and Reception

7.1. National Television System Committee (NTSC)

7.1.1. Conventional analogue television broadcast in Saint Lucia, utilize the National Television

System Committee (NTSC) standard for transmission of audio and video signals. NTSC

television channel as transmitted occupies a total bandwidth of 6MHz. A guard band, which

does not carry any signals, occupies the lowest 250 kHz of the channel to avoid interference

between the video signal of one channel and the audio signals of the next channel down.

The actual video signal, which is amplitude-modulated, is transmitted between 500 kHz

and 5.45 MHz above the lower bound of the channel. 'the video carrier is 1.25 MHz

above the lower bound of the channel. Like most AM signals, the video carrier generates

two sidebands, one above the carrier and one below. The sidebands are each 4.2 MHz wide.

The entire upper sideband is transmitted, but only 750 kHz of the lower sideband, known as

a vestigial sideband, is transmitted. The color subcarrier, as noted above, is 3.579545 MHz

above the video carrier, and is quadrature-amplitude-modulated with suppressed

carrier. The highest 25 kHz of each channel contains the audio signal, which is frequency-

modulated. The main audio carrier is 4.5 MHz above the video carrier.

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7.1.2. Standards

Television standard NTSC

Channel bandwidth 6.0 MHz per channel

Channel configuration Standard 4.5 MHz

video/audio: audio 15-17 dB

below carrier

Minimum signal level at TV input 2 dbmV across 75-ohm

termination at the channel input

Minimum Carrier/Noise 30 dBc (below carrier)

Visual carrier frequency 1.256 MHz above channel

lower limit

Permissible variation of visual carrier level

Over 24 hours 12 dB max

Between two adjacent channels 3 dB max

between any two channels 12 dB max

Frequency response (each channel) + 2 dB from 0.75 kHz to 4kHz above visual carrier level

Aural frequency deviation 25kHz

Signal to inter-modulation ratio 45dBmin

Radiation level < 15 uV/mat30 metres

Line amplifier voltage 60Vac max

Figure 7.1.2

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7.1.3. Summary of Technical Details

7.1.4. Channel Assignment:

The following tables represent the channel assignment for NTSC television transmission.

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8. Technical Standards for Subscriber Television Signal Transmission and Reception

8.1. Standards The provision of cable television service is carried out with the use of domestic television set as

the standard video output device. The standards applied though similar parts must not be used

interchangeably as the mode of delivery is distinctly different; one being a coaxial cable and the

other a wireless (RF) signal.

Television standard NTSC

Channel bandwidth 6.0 MHz per channel

Channel configuration Standard 4.5 MHz

video/audio: audio 15-17 dB

below carrier

Minimum signal level at TV input 2 dbmV across 75-ohm

termination at the channel input

Minimum Carrier/Noise 30 dBc (below carrier)

Visual carrier frequency 1.256 MHz above channel

lower limit

Permissible variation of visual carrier level

Over 24 hours 12 dB max

Between two adjacent channels 3 dB max

between any two channels 12 dB max

Frequency response (each channel) + 2 dB from 0.75 kHz to 4kHz above visual carrier level

Aural frequency deviation 25kHz

Signal to inter-modulation ratio 45dBmin

Radiation level < 15 uV/mat30 metres

Line amplifier voltage 60Vac max

8.2. Prohibited Frequencies

8.2.1. No subscriber television system may utilize a frequency at power levels equal to or

exceeding 10 micro watts within 100 kHz plus tolerance of the emergency aircraft locator

frequency 121.5 MHz or within 50 kHz plus tolerance of the distress signal frequencies

156.8 MHz and 243.0MHz.

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8.3. Technical Parameters for Transmission via Cable

8.3.1. This Part applies to the performance of a subscriber television system as measured at any

subscriber terminal with a matched impedance at the termination point or at the output of

the modulation or processing equipment (generally the head-end) of the subscriber

television and are applicable to each NTSC or similar video downstream subscriber

television channel in the system.

1) The subscriber television channels delivered to the subscriber's terminal shall be

capable of being received and displayed by TV broadcast receivers used for the off-

the-air reception of TV broadcast signals.

2) Subscriber television systems shall-

a) Transmit channels to subscriber premises equipment on frequencies in

accordance with the channel allocation plan specified in section 8.5;

b) Use the channel allocation plan for signals transmitted in the frequency

range 54 MHz to 1002MHz.

3) The aural centre frequency of the aural carrier shall be 4.5 MHz 5 kHz above the

frequency of the visual carrier at the output of the modulating or processing

equipment of a subscriber television system and at the subscriber terminal.

4) (1) The visual signal level across a terminating impedance which correctly

matches the internal impedance of the subscriber system as viewed from the

subscriber terminal shall-

a) not be less than 1 millivolt across an internal impedance at 75 ohms

(0dBmV);

b) as measured at the end of a 30 metre cable drop that is connected to the

subscriber tap, not be less than 1.41 millivolts across an internal

impedance of75 ohms(+ 3 dBmV).

(2) At other impedance (Z) values, the minimum visual signal level as viewed

from the subscriber terminal, shalt be the square .Jo.0133 x Z milivolts and, as

measured at the end of 30 metre cable drop that is connected to the

subscriber tap shall be 2 0.00662 x Z millivolts.

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5 ) The visua l s i gna l l eve l on each channel as measured a t the end of

30 met re cable drop tha t i s connected to the subscr iber t ap sha l t

not vary more than 8 dB wi th in any s ix month in te rva l , and sha l l

be mainta ined wi th in

a ) 3 dB of the visual signal level of -any visual carrier within a 6 MHz

nominal frequency separation

b) 10 dB of the visual signal level on any other channel on a cable

television system of up to 300 MHz of a cable distribution system

upper frequency limit, with a 1 dB increase for each additional 100

MHz of cable distribution system upper frequency limit (for example, 11

dB for a system at 301-400MHz, etc); and

c) a maximum level such that signal degradation due to overload in the

subscriber's receiver or terminal does not occur.

6) (1) The root mean square voltage of the aural signal shall be maintained between

10 and 20 dB below the associated visual signal level and shall be met at the

subscriber terminal and at the output of the modulating and processing equipment

(generally the head-end).

(2) Subscriber terminal which use equipment which modulate and demodulate the

signal (for example, base band converters), the root mean square voltage of the

aural signal shall be maintained between 6.5 and 17 dB below the associated visual

level at the subscriber terminal.

7) (1) The amplitude characteristic shall be a range of 2 dB from 0.75 MHz to 5.0

MHz above the lower boundary frequency of the cable television channel

referenced to the average of the highest and lowest amplitudes within those

frequency boundaries.

(2) The amplitude characteristic may be measured after subscriber tap and before a

converter which is provided and maintained by the licensee may be measured at the

subscriber terminal.

8) The ratio of RF visual signal level to the system noise shall not be less than

40dB.

9) The ratio of visual signal level to the root mean square amplitude of any coherent

disturbances (for example, intermodulation products, second and the third order

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distortions or discrete frequency interfering signals not operating on proper

offset assignments):

a) shall not be less than 51 dB for noncoherent channel subscriber

television systems, when ensured with modulated carriers and time

averaged; and

b) which are frequency-coincident with the visual currier, shall not be less

than 47 dB for current channel subscriber system \'{hen measured with

modulated carriers and time averaged.

10) The terminal isolation provided to each subscriber terminal

a) shall not be less than 18 dB in lieu of periodic testing, so however, that the

licensee may use specifications provided by the manufacturer for the

terminal isolation equipment to meet this standard, and

b) shall be sufficient to prevent reflections caused by open circuited or

short-circuited subscriber terminals from producing visual picture

impairments at any other subscriber terminal.

11) (1) The peak-to peak variation in visual signal level caused by undesired low

frequency disturbances (hum or repetitive transients) generated within the system,

or by inadequate low frequency response, shall not exceed 3 percent of the visual

signal level.

(2) Measurements made on a single channel using a single unmodulated carrier may

be used to demonstrate compliance with this parameter at each test location.

12) The following requirements apply to the performance of the subscriber television

system as measured at the output of the modulating or processing equipment

(generally the head-end) of the system:

a) the chrominance luminance delay inequality (or chrome delay} which is the

change in delay time of the chrominance component of the signal relative

to the luminance component, shall be within 170 nanoseconds;

b) the differential gain for the colour subcarrier of the television signal

which is measured as the difference in amplitude between the largest and

smallest segments of the chrominance signal divided by the largest, shall

not exceed 20%; and

c) the differential phase for the colour subcarrier of the television signal

which is measured as the largest phase difference in degrees between

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each segment of the chrominance signal and reference segment (the

segment at the blanking level of 0 IRE) shall not exceed 10 degrees.

13) Signal leakage from n subscriber television systems shall be limited as follows:

14) (1) For operation in the frequency bands 108-137 and 225-400 MHz the

standards relating to Signaling Leakage Performance Criteria and Frequency

Separation Standards are applicable to all subscriber television systems

transmitting carriers or other signal components carried at an average power level

equal to or greater than 10-4 watts across a 25 KHz bandwidth in any 160

microsecond period at any point in the cable distribution system in the frequency

bands 108-137 and 225-400 MHz for any purpose.

(2) Before transmitting any carrier or other signal component with an average

power level across a 25 Hz bandwidth in any 160 microsecond time period

ec1ual to or greater than 10-4 watts at any point in the subscriber television

distribution system on any new frequency or frequencies the aeronautical

radio frequency bands the licensee is to notify the Commission.

8.3.2. Frequency Separation Standards

8.3.2.1. All subscriber television systems which operate in the frequency bands 108-

137 and 225-400 MHz shall comply with the following frequency separation

standards:

1) In the aeronautical radio communication bands 108-137, 225-328.6 and

335.4- 400 MHz, the frequency of all carrier signals or signal components

carried at an average power level equal to or greater than 10-4

watts in a 25

kHz bandwidth in any 160 microsecond period shall operate at frequencies

offset from certain frequencies which may be used by aeronautical

radio services and the aeronautical frequencies from which offsets shall

be maintained are those frequencies which arc within one of the

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aforementioned aeronautical bands, and when expressed in MHz and divide by

0.025 yield an integer, the offset meeting one of the following criteria;

a) all such cable carriers or signal components shall be offset by 12.5kHz

with a frequency tolerance of 5 Hz; or

b) the fundamental frequency from which the carrier frequencies arc

derived by multiplication by an integer number which shall be 6.0003

MHz with a tolerance of 1Hz Harmonically Related Carrier (HRC)

comb generators only

2) In the aeronautical radio navigation bands 108-118 and 328.6-335.4 MHz,

the frequency of all carrier signals or signal components carrier at an

average power level equal to or greater than 104 watts in a 25Hz bandwidth

in any 160 microsecond period shall be offset by 25 hz with a tolerance of 5hz

and the aeronautical radio-navigation frequencies from which offsets

shall be maintained arc as follows-

a) within the aeronautical band108- 118 MHz when expressed in MHz

and divided by 0.025 yield even integer;

b) within the band328.6- 335.4MHz.

NOTE: The Harmonically Related Carrier (HRC) system shall meet the requirement in the 328.5 - 335.4 MHz navigation glide path band, those incrementally Related Carriers

(IC) system with comb generator reference frequencies set at certain odd multiples equal to or greater than 3 times the 0.0125 MHz aeronautical communications band offset (for example 6n 1.250 0.0375 MHz may also meet the 25 kHz offset requirement in the navigation glide path band).

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8.4. Channel Allocation Plan For Subscriber Television

8.4.1. No allocation shall be made by a licensee who operates subscriber television service

for operations over the standard VHF Channels which are in use for conventional

analogue television broadcasting operations in the zone served by the licensee, that is

to say, channels 2 to 13.

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Glossary Cabinet Radiation: is any emission from the transmitting equipment housing or enclosure from sources

other than a normal output port.

Carrier Frequency Stability. is the ability of the transmitting equipment to maintain a mean test frequency.

Power Outing Rating: [of transmitting equipment]: is the carrier power at which the transmitting

equipment may be operated continuously into the test load.

Spurious Emissions: are radio frequency signals appearing at the transmitting equipment output terminals

on frequency other than the specified frequency and modulation products.

References Telecommunications Act [No. 27 of2000];

Recommendation ITU-R BS.450-3: Transmission standards for FM sound broadcasting at

VHF;

RECOMMENDATION ITU-R BS.643-2: System for automatic tuning and other applications in

FM radio receivers for use with the pilot-tone system;

Technical Standards for Broadcast Service

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