ETSI ETS 300 750 ed.1 (1997-03)

Radio broadcasting systems; Very High Frequency (VHF), frequency modulated, sound broadcasting transmitters in the 66 to 73 MHz band

DE/JTC-VHFTXHU

Sistemi radiodifuzije – Zelo visokofrekvenčni (VHF), frekvenčno modulirani, zvokovni radiodifuzni oddajniki v frekvenčnem pasu od 66 MHz do 73 MHz

General Information

• Status: Published
• Publication Date: 02-Mar-1997
• Technical Committee: BROADCAS - EBU/CENELEC/ETSI on Broadcasting
• Current Stage: 12 - Completion
• Due Date: 21-Mar-1997
• Completion Date: 03-Mar-1997
• Ref Project: SIST ETS 300 750 E1:2003 - Radio broadcasting systems; Very High Frequency (VHF), frequency modulated, sound broadcasting transmitters in the 66 to 73 MHz band

Standards Content (Sample)

SLOVENSKI STANDARD
SIST ETS 300 750 E1:2003
01-december-2003
6LVWHPLUDGLRGLIX]LMH±=HORYLVRNRIUHNYHQþQL9+)IUHNYHQþQRPRGXOLUDQL
]YRNRYQLUDGLRGLIX]QLRGGDMQLNLYIUHNYHQþQHPSDVXRG0+]GR0+]
Radio broadcasting systems; Very High Frequency (VHF), frequency modulated, sound
broadcasting transmitters in the 66 to 73 MHz band
Ta slovenski standard je istoveten z: ETS 300 750 Edition 1
ICS:
33.170 Televizijska in radijska Television and radio
difuzija broadcasting
SIST ETS 300 750 E1:2003 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST ETS 300 750 E1:2003

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SIST ETS 300 750 E1:2003
EUROPEAN ETS 300 750
TELECOMMUNICATION March 1997
STANDARD
Source: EBU/CENELEC/ETSI JTC Reference: DE/JTC-00VHFTXHU
ICS: 33.060.20
Key words: Broadcasting, radio, transmitter, FM, VHF, audio
European Broadcasting Union Union Européenne de Radio-Télévision
Radio broadcasting systems;
Very High Frequency (VHF), frequency modulated,
sound broadcasting transmitters
in the 66 to 73 MHz band
ETSI
European Telecommunications Standards Institute
ETSI Secretariat
Postal address: F-06921 Sophia Antipolis CEDEX - FRANCE
Office address: 650 Route des Lucioles - Sophia Antipolis - Valbonne - FRANCE
X.400: c=fr, a=atlas, p=etsi, s=secretariat - Internet: [e-mail]
Tel.: [phone] - Fax: [phone]
Copyright Notification:
No part may be reproduced except as authorized by written permission. The copyright and the
foregoing restriction extend to reproduction in all media.
© European Telecommunications Standards Institute 1997.
© European Broadcasting Union 1997.
All rights reserved.

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ETS 300 750: March 1997
Whilst every care has been taken in the preparation and publication of this document, errors in content,
typographical or otherwise, may occur. If you have comments concerning its accuracy, please write to
"ETSI Editing and Committee Support Dept." at the address shown on the title page.

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ETS 300 750: March 1997
Contents
Foreword .5
1 Scope .7
2 Normative references.7
3 Definitions and abbreviations .8
3.1 Definitions .8
3.2 Abbreviations .8
4 Technical requirements.9
4.1 Characteristics of RF interface ports .9
4.2 Transmitter input configuration .9
4.3 Transmitter output characteristics .9
4.4 Frequency range.9
4.5 Frequency stability .10
4.5.1 Frequency error.10
4.5.2 Frequency drift .10
4.6 Frequency adjustment .10
4.7 Unwanted frequency shift .10
4.8 Frequency deviation.10
4.9 Overdeviation.10
4.10 Deviation sensitivity stability.11
4.11 Unwanted emissions.11
4.11.1 Spurious emissions .11
4.11.2 Out-of-band emissions - stereophonic transmitters .11
4.11.3 Out-of-band emissions - monophonic transmitters .11
4.12 Amplitude Modulation (AM).11
4.12.1 Synchronous AM (AM due to FM) .11
4.12.2 Hum and noise (residual AM).11
4.13 Test load characteristics.11
5 Operating and test conditions.12
5.1 Normal operating and test conditions .12
5.2 Extreme operating and test conditions .12
Annex A (normative): Stereo test encoder for pilot tone system, audio and multiplex parameters .17
A.1 Introduction.17
A.2 Input parameters .17
A.2.1 Audio inputs .17
A.2.2 Auxiliary inputs.17
A.2.2.1 Impedance.17
A.2.2.2 Gain.17
A.3 Pilot signal .17
A.3.1 Pilot tone .17
A.3.2 Pilot tone output .17
A.3.3 External pilot synchronizing .17
A.4 Output.18
A.4.1 MPX coded signal.18
A.4.2 Level of the MPX coded signal .18
A.4.3 Spurious frequencies .18

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A.5 Non-linear distortion. 18
A.5.1 Harmonic distortion of the encoder . 18
A.5.2 Base-band frequency intermodulation products of the encoder. 18
A.5.3 Distortion products of the decoder . 19
A.6 Signal-to-Noise ratio (S/N). 19
A.6.1 Unweighted S/N . 19
A.6.2 Weighted S/N. 19
A.7 Linear distortion . 19
A.7.1 AF channel amplitude difference. 19
A.7.2 Auxiliary input . 19
A.8 Linear crosstalk . 19
A.8.1 Crosstalk attenuation between the M and S channels . 19
A.8.2 Crosstalk attenuation between the two AF channels . 19
Annex B (normative): RF Spectrum measurements to detect excessive spectrum pollution due to
abnormal AF - input levels . 20
B.1 Measuring arrangement . 20
B.2 Measuring procedure. 20
B.3 Presentation of the results. 20
Annex C (informative): General conditions of operation. 21
C.1 Temperature in the operating room. 21
C.2 Relative humidity in the operating room . 21
C.3 Cooling air temperature . 21
C.4 Relative humidity of the air entering the cooling system up to 25°C. 21
C.5 Air pressure . 21
C.6 Immunity against mechanical vibrations airborne or air pressure . 21
C.7 Immunity against electric field strength within the broadcasting bands. 21
C.8 Immunity against magnetic field strength . 21
C.9 Mains voltage. 21
C.10 Mains frequency . 21
Annex D (normative): Reverse intermodulation measurements. 22
D.1 Scope of annex. 22
D.2 Measurement arrangement . 22
D.3 Principle of measurement. 22
D.4 Measurement routine. 23
Annex E (informative): Bibliography . 24
History. 25

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ETS 300 750: March 1997
Foreword
This European Telecommunication Standard (ETS) has been produced by the Joint Technical Committee
(JTC) of the European Broadcasting Union (EBU), Comité Européen de Normalisation ELECtrotechnique
(CENELEC) and the European Telecommunications Standards Institute (ETSI).
This ETS defines the performance characteristics of Very High Frequency (VHF), frequency modulated,
monophonic and stereophonic sound broadcasting transmitters operating in the frequency band 66 MHz
to 73 MHz needed in Eastern Europe as requested by Hungary and supported by Romania. This ETS is
based upon and complements ETS 300 384, which covers the frequency band 87,5 MHz to 108 MHz.
NOTE: The EBU/ETSI JTC was established in 1990 to co-ordinate the drafting of ETSs in the
specific field of broadcasting and related fields. Since 1995 the JTC became a tripartite
body by including in the Memorandum of Understanding also CENELEC, which is
responsible for the standardization of radio and television receivers. The EBU is a
professional association of broadcasting organizations whose work includes the
co-ordination of its Members' activities in the technical, legal, programme-making and
programme-exchange domains. The EBU has Active Members in about 60 countries
in the European Broadcasting Area; its headquarters is in Geneva *.
* European Broadcasting Union
Case Postale 67
CH-1218 GRAND SACONNEX (Geneva)
Switzerland
Tel: [phone]
Fax: [phone]
Transposition dates
Date of adoption: 28 February 1997
Date of latest announcement of this ETS (doa): 30 June 1997
Date of latest publication of new National Standard
or endorsement of this ETS (dop/e): 31 December 1997
Date of withdrawal of any conflicting National Standard (dow): 31 December 1997

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1 Scope
This European Telecommunication Standard (ETS) covers those performance requirements for
Very High Frequency (VHF) Frequency Modulation (FM) sound broadcasting transmitters operating in the
frequency band 66 MHz to 73 MHz, and modulated in accordance with ITU-R Recommendation 450-2 [1],
which has some bearing on the Radio Frequency (RF) spectrum. Monophonic signals are transmitted in
accordance with section 1, and stereophonic signals in accordance with section 2.2 (pilot tone system) of
ITU-R Recommendation 450-2 [1]. This ETS also covers the transmission of supplementary signals as
described in ITU-R Recommendation 450-2 [1] and EN 50067 [2]. The RDS (EN 50067 [2]) has been
defined in band 87,5 to 108 MHz. The view of RDS Forum held in Budapest during November 1994 is that
the 66 to 73 MHz band is not suitable for the transmission of RDS on networked transmissions.
This ETS considers only those technical characteristics that relate to the radiated signal and hence
directly affect the efficient use of RF spectrum.
The use of ITU-R Recommendation 412-7 [3] for planning sound broadcasting services is assumed.
Spurious and out-of-band emission limits specified in figures 1 and 3 respectively are incorporated to
protect both aeronautical navigation and communication services operating in the frequency band
108 MHz to 137 MHz and rebroadcast reception in the frequency band 66 MHz to 73 MHz.
In those areas where reliance on a transmitter specification alone cannot guarantee protection of the
RF spectrum (e.g. reverse intermodulation), recommendations appropriate to installed systems are
described in ETR 132 [8].
Electro-Magnetic Compatibility (EMC) aspects for equipment covered by this ETS are given in
ETS 300 447 (see annex E, Bibliography).
2 Normative references
This ETS incorporates by dated and undated reference, provisions from other publications. These
normative references are cited at the appropriate places in the text and the publications are listed
hereafter. For dated references, subsequent amendments to or revisions of any of these publications
apply to this ETS only when incorporated in it by amendment or revision. For undated references, the
latest edition of the publication referred to applies.
[1] ITU-R Recommendation 450-2 (1982): "Transmission standards for FM sound
broadcasting at VHF".
[2] EN 50067: "Specification of the Radio Data System (RDS)".
[3] ITU-R Recommendation 412-7 (1990): "Planning standards for FM sound
broadcasting at VHF".
[4] IEC 244-1: "General conditions of measurements, frequency, output power".
[5] IEC 244-2: "Bandwidth, out of band power and power of non-essential
oscillations".
[6] EN 60244-13: "Methods of measurements for radio transmitters, Performance
characteristics for FM sound broadcasting".
[7] CCIR Recommendation 468-4 (1986): "Measurement of audio frequency noise
voltage levels in sound broadcasting".
[8] ETR 132: "Radio broadcasting systems; Code of practice for site engineering
Very High Frequency (VHF), frequency modulated, sound broadcasting
transmitters".
[9] ITU-R Recommendation IS.851-1: "Sharing between the broadcasting service
and the fixed and/or mobile services in the VHF and UHF band (Question
ITU-R 2/12)".

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3 Definitions and abbreviations
3.1 Definitions
For the purposes of this ETS the following definitions apply:
difference signal S: S = (L-R)/2; this information allows the stereo-receiver to regain signals L and R in
conjunction with the M signal.
Multiplex (MPX) signal: This signal contains all information, including the pilot tone and any
supplementary signal which is used to frequency modulate the VHF FM transmitter.
out-of-band emissions: Emission on a frequency or frequencies immediately outside the necessary
bandwidth which results from the modulation process, but excluding spurious emissions.
pilot tone: The pilot tone (19 kHz) is used to regain the stereo subcarrier in the stereo-receiver.
Radio Data System (RDS): RDS is a signal containing information on programmes and broadcasting
network as defined in EN 50067 [2]. This signal is carried by a subcarrier at 57 kHz, amplitude modulated
by the encoded data with suppressed carrier in a frequency band of ±2,4 kHz.
signal L: Signal L corresponds to the information in the left channel.
signal R: Signal R corresponds to the information in the right channel.
spurious emissions: Emission on a frequency or frequencies which are outside the necessary bandwidth
and the level of which may be reduced without affecting the corresponding transmission of information.
Spurious emissions include harmonic emissions, parasitic emissions, intermodulation products and
frequency conversion products but exclude out of band emissions.
stereo subcarrier: The subcarrier (38 kHz) converts the S signal to the carrier-frequency position
(23 kHz to 53 kHz).
sum signal M: M = (L + R)/2; this information is also the signal for the monophonic receiver.
supplementary signal: This signal can operate in the range between 53 kHz and 76 kHz, according to
ITU-R Recommendation 450-2 [1].
unwanted emissions: Consist of spurious emissions and out of band emissions.
3.2 Abbreviations
For the purposes of this ETS, the following abbreviations apply:
AC Alternating Current
AF Audio Frequency
AM Amplitude Modulation
DC Direct Current
EMC Electro Magnetic Compatibility
FM Frequency Modulation
ISS Interfering Signal Source
MPX Multiplex
RDS Radio Data System
RF Radio Frequency
rms root mean square
S/N Signal-to-Noise ratio
TUT Transmitter Under Test
VHF Very High Frequency

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4 Technical requirements
The transmitter shall be tested:
- at its rated output power, as declared by the manufacturer;
- into a load as defined in subclause 4.13 a), unless otherwise stated.
The transmitter operating at any frequency in the range 66 MHz to 73 MHz shall comply with the
requirements of this clause.
If the transmitter incorporates RDS, then the transmission shall be in accordance with ITU-R
Recommendation 450-2 [1] and EN 50067 [2]. The RDS can only be implemented without the Alternative
Frequency feature. If the transmitter incorporates any other form of supplementary signal(s), then the
transmission shall be in accordance with ITU-R Recommendation 450-2 [1].
The method of measurement for the parameters listed in the following subclauses shall be in accordance
with EN 60244-13 [6], IEC 244-1 [4] and IEC 244-2 [5], unless otherwise stated.
4.1 Characteristics of RF interface ports
All RF output ports designated to interface with other equipment shall operate into a nominal impedance
of 50 Ω.
All RF input ports designated to interface with other equipment shall have a nominal impedance of 50 Ω
when driven in accordance with the manufacturers specifications.
4.2 Transmitter input configuration
If the transmitter does not incorporate a stereo encoder and is intended for stereo operation then a test
encoder to the specification given in annex A shall be used.
If the transmitter is designed only for monophonic transmissions (i.e. without an MPX input) out-of-band
emissions shall be tested in accordance with subclause 4.11.3.
4.3 Transmitter output characteristics
The carrier output power shall be within ±1,0 dB of the rated output power under normal operating
conditions as defined in subclause 5.1. The carrier output power under extreme conditions, as defined in
subclause 5.2, shall be within +2,0 dB and -3,0 dB of the rated output power.
The transmitter shall be capable of delivering its rated RF output power into an antenna with an input
return loss of ≥ 16 dB at all phase angles.
The transmitter shall be capable of operating without damage into loads including open and short circuits,
and may shut down or operate at reduced RF output power level to meet this requirement.
The reverse intermodulation performance at the operating frequency or frequencies of the transmitter
shall be measured according to the method described in annex D. The frequency offset of the interfering
source shall be varied over the range 300 kHz to 7 MHz maximum on both sides of the carrier, but shall
remain within the range 66 MHz to 73 MHz.
The reverse intermodulation shall not exceed -10 dB at all frequency offsets within the above range.
4.4 Frequency range
The transmitter shall operate within the range 66 MHz to 73 MHz. The preferred operating frequencies
shall be multiples of 10 kHz. If 10 kHz channel spacing is not used the actual channel spacing shall be
declared by the manufacturer.

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4.5 Frequency stability
"Frequency error" and "frequency drift" are respectively defined in sections 5.2.5 and 5.2.6 of
IEC 244-1 [4].
4.5.1 Frequency error
The carrier frequency shall be maintained within ±2 kHz of its nominal value, under normal and extreme
operating conditions as defined in clause 5.
4.5.2 Frequency drift
The stability of the carrier frequency shall be better than ±300 Hz within a three month period when
measured under identical operating conditions at the start and end of the period.
4.6 Frequency adjustment
The carrier frequency shall be adjustable to an accuracy of ±50 Hz.
4.7 Unwanted frequency shift
This subclause applies to transmitters incorporating frequency control loops.
To prevent unwanted frequency shift, the transmitter shall incorporate the means by which the RF output
is automatically muted if the carrier frequency generation circuits develop a fault which would result in a
loss of frequency control.
In the case of a carrier frequency change, the RF output shall be muted during the tuning process.
The muting suppression shall be at least 50 dB, or the output power shall be reduced to ≤ 1 mW,
whichever value results in the lowest emission.
4.8 Frequency deviation
Not withstanding subclauses 4.9 and 4.10 below, the maximum peak frequency-deviation of the installed
transmitter system, including limiting equipment which may be external to the transmitter (see note) shall
not exceed ± 50 kHz (or ± 75 kHz) under normal operating conditions as specified in subclause 5.1. Also
the parameters specified in section 2.3 of ITU-R Recommendation 412-7 [3] and section 2.2 of ITU-R
Recommendation 450-2 [1] shall be fulfilled.
NOTE: For further information see ETR 132 [8].
As some parts of the frequency band 66 to 73 MHz in some European neighbouring countries are used by
FM sound broadcasting in one country, and landmobile services in the other country, the Protection ratios
specified in ITU-R Recommendation IS.851-1 [9] shall be fulfilled.
4.9 Overdeviation
This subclause verifies that any non-linearity in the transmitter do not cause excessive out-of-band
emissions when the transmitter is subjected to abnormal Audio Frequency (AF) input levels. Under these
conditions it is possible that the RF spectrum will be unacceptably polluted, even though the deviation may
not exceed ± 50 kHz (or ± 75 kHz).
The test conditions shall be as follows:
a) the transmitter shall be modulated with a sinusoidal input tone 1 kHz. The input level shall be
adjusted to obtain a frequency deviation of ± 21 kHz (or ± 32 kHz) for monophonic transmissions,
and to ± 27 kHz (or ± 40 kHz) for stereophonic transmissions including pilot tone;
b) the output level of the AF generator shall be increased by 12 dB. The resulting transmitter
RF output spectrum shall not exceed the levels shown in figure 4 when measured using a 1 kHz
resolution bandwidth.

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The measuring procedures are given in annex B.
4.10 Deviation sensitivity stability
The deviation sensitivity (MHz/V) of the transmitter shall remain within ±3 % of the manufacturer's
declared value over the range of normal and extreme operating conditions specified in clause 5.
However for frequency-agile transmitters intended for operation under remote or automatic frequency
control (e.g. "N+1" systems), and operating on any frequency within the range 66 MHz to 73 MHz, the
deviation sensitivity (MHz/V) of the transmitter shall remain within ±5 % of the manufacturer's declared
value.
4.11 Unwanted emissions
The following requirements shall be met when operating into the relevant test loads as defined in
subclause 4.13 and as applied in accordance with table 1.
4.11.1 Spurious emissions
Spurious emissions shall not exceed:
a) the limits set out in figure 1 in the frequency range 66 MHz to 137 MHz;
b) the limits set out in figure 2 at any other frequency in the range 30 MHz to 1 GHz.
4.11.2 Out-of-band emissions - stereophonic transmitters
The measurements for out-of-band emissions shall be carried out in accordance with EN 60244-13 [6],
using procedures specified for stereophonic operation.
The effective value of the out-of-band emission shall not exceed the values shown in figure 3.
4.11.3 Out-of-band emissions - monophonic transmitters
This test shall be applied to transmitters without an MPX input. The measurements shall be carried out in
accordance with EN 60244-13 [6] using the procedures specified for monophonic operation.
The effective value of the out-of-band emission shall not exceed the values shown in figure 3.
4.12 Amplitude Modulation (AM)
4.12.1 Synchronous AM (AM due to FM)
The permitted level of AM due to FM shall not exceed 2 % for a peak deviation of ± 27 kHz (or ± 40 kHz)
at a modulation frequency of 500 Hz. The measurement shall be carried out in accordance with
EN 60244-13 [6], subclause 8.3.2.
4.12.2 Hum and noise (residual AM)
The permitted level of residual AM in the absence of modulation shall not exceed 1 % when measured in
a bandwidth of 20 Hz to 20 kHz (unweighted). The measurement shall be carried out in accordance with
EN 60244-13 [6], subclause 8.3.1.
4.13 Test load characteristics
For measurements detailed in table 1, the transmitter shall be required to operate into:
a) a precision load with a return loss of ≥ 26 dB in frequency range 66 MHz to 73 MHz and ≥ 16 dB at
all other frequencies up to 1 000 MHz;
b) a narrow band load with band pass characteristics as follows:

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- return loss ≥ 26 dB over the range ƒ ±100
...