 OFCOM  
Rue de l’Avenir 44  
Case postale  
CH-2501 Biel -Bienne  
www.ofcom.admin.ch  
  
 Federal Department of Environment,  
Transport, Energy and Communications DETEC  
Federal Office of Communications OFCOM 
  
NT-3003 V2.0.0  
 
Technical Standard  
concerning  
DAB/DAB+ In-House low power Repeaters  
 
 
Titre en français:  Norme technique  concernant les réémetteurs DAB bande III de faible 
puissance destinés à être exploités à l'intérieur d'immeubles.  
Titel auf Deutsch:  Technische Norm  betreffend die Band III DAB Umsetzer von geringerer 
Leistung , welche in Gebäude eingesetzt werden.  
Titolo in italiano:  Norma tecnica  relativa a ripetitori  DAB band III bassa potenza destinati ad 
essere esercitati nelle case.  
Edition:  V2.0.0  
Coming into force:  01.09.2020  
  
NT-3003  
 
1000348814  2/17 
 Contents  
1 GENERAL  .......................................................................................................................................................... 3 
1.1 FOREWORD / INTRODUCTION / EINFÜHRUNG / INTRODUZIONE ..................................................................................... 3 
1.2 SCOPE  ............................................................................................................................................................... 4 
1.3 REFERENCES  ....................................................................................................................................................... 4 
1.4 NORMATIVE REFERENCES  ...................................................................................................................................... 4 
1.5 LEGAL REFERENCES  .............................................................................................................................................. 4 
1.6 INFORMATIVE REFERENCES  .................................................................................................................................... 4 
2 DEFINI TIONS AND ABBREVIATI ONS  ................................................................................................................. 5 
2.1 DEFINITIONS  ....................................................................................................................................................... 5 
2.2 ABBREVIATIONS  .................................................................................................................................................. 6 
3 TECHNICAL REQUIREMEN TS SPECIFICATIONS AN D LIMITS  ............................................................................... 7 
3.1 INTRODUCTION  ................................................................................................................................................... 7 
3.2 BASIC RULES , EG 200  053 ................................................................................................................................... 7 
3.3 ENVIRONMENTAL PROFILE  ..................................................................................................................................... 8 
3.4 NOMINAL DAB  RF-TEST SIGNAL  ............................................................................................................................. 8 
3.5 INTERPRETATION OF THE MEASUREMENT RESULTS  ...................................................................................................... 8 
3.6 REQUIREMENTS , LIMITS AND TEST PRO CEDURE  .......................................................................................................... 8 
3.6.1  Maximal radiated total power  ................................................................................................................... 8 
3.6.2  Intermodulation products  ........................................................................................................................ 10 
3.6.3  Spurious emissions  ................................................................................................................................... 11 
3.6.4  Repeat er in -band gain  .............................................................................................................................. 12 
3.6.5  Repeater out of band gain ........................................................................................................................ 13 
4 REPEALED DOCUMENTS  .................................................................................................................................  15 
ANNEX A (NOR MATIVE): REQUIREMENT S AND CONFORMANCE TE ST SPECIFICATIONS TA BLE ............................... 16 
 NT-3003  
 
1000348814  3/17 
 1 General  
1.1 Foreword / introduction / Einführung / introduzione  
This technical standard specifies, for Band III DAB/DAB+ In -House low power Repeaters, the 
essential requirement  of effective use of the spectrum  according article 7 paragraph 2 TIO 
(Ordinance on Telecommunications Installations [l.2]). Products manufactur ed in compliance with 
the requirements of this technical standard benefit from a presumption of conformity with the 
corresponding essential requirements. This standard is  published in the Official Federal Gazette 
as designated technical standard in accordance with Article 31 paragraph 2 letter a TCA 
(Telecommunications Act of 30 April 1997 [l.1] ) and Article 4 paragraph 2 TIO [l.2].  
Note for placing on the market outside Switzerland: As this standard is not a harmonised 
standard according to the European RED Directive, it does not give presumption of conformity 
with the essential requirement of effective use of radio spectrum outside Switzerland.  
 
Cette norme technique concrétise pour les réémetteurs de faible puissance DAB/DAB+ bande III 
destinés à être exploités à l'intérieur d'immeubles,  l’exigence essentielle d’utilisation efficace  du 
spectre selon l’art. 7 al. 2  de l’OIT (Ordonnance sur les installations de télécommunication [l.2]). 
Son respect permet de présumer que cette exigence essentielle est rem plie. Elle est publiée 
dans la Feuille fédérale comme norme désignée selon l'art. 31, al. 2, let. a, LTC (Loi sur les 
télécommunications du 30 avril 1997 [l.1]) et art. 4, al. 2, OIT ([l.2]).  
Remarque concernant la mise sur le marché à l'extérieur de la Suisse: Cette norme n'étant pas 
une norme harmonisée au sens de la directive européenne RED, elle ne pose pas présomption 
de conformité à l'exigence essentielle de l'utilisation efficace du spectre en dehors de la Suisse.  
La suite de ce document est rédigé en langue anglaise.  
 
Diese technische Norm legt für Band III DAB Umsetzer von geringerer Leistung, welche in 
Gebäude eingesetzt werden, die grundlegenden Anforderungen bezüglich effizienter Nutzung 
des Spektrums in Ü bereinstimmung mit Art. 7 Abs. 2 FAV (Ve rordnung über Fernmeldeanlagen 
[l.2]) fest. Werden die in dieser technischen Norm aufgeführten Anforderungen eingehalten, so 
wird vermutet, dass diese grundlegende Anforderung erfüllt ist. Diese Norm ist im Amtsblatt als 
bezeichnete Norm in Übereinstimmung  mit Art. 31 Abs. 2 Bst. a FMG (Fernmeldegesetz vom 30. 
April 1997 [l.1]) und Art. 4 Abs. 2 FAV [l.2] publiziert.  
Bemerkung zum Inverkehrbringen ausserhalb der Schweiz in Hinblick auf die europäische RED -
Richtlinie: Da diese Norm keine harmonisierte Norm im Sinne der Richtlinie RED ist, vermittelt sie 
ausserhalb der Schweiz keine Konformitätsvermutung für die grundlegende Anforderung der 
effizienten Spektrumsnutzung.  
Der weitere Inhalt dieses Dokuments ist in englischer Sprache verfasst.  
 
Questa norma tecnica concretizza, per i ripetitori DAB band III a bassa potenza destinati ad 
essere esercitati nelle case,  l'esigenz a fondamentale per l’uso efficace dello spettro ai sensi 
dell'art. 7 cpv. 2, OIT (Ordinanza sugli impianti di telecomunicazione [l.2]). Il rispetto di questa 
norma tecnica presume che questa esigenza fondamentale sia adempiuta. Questa norma è 
pubblicata nel Foglio federale come norme designata ai sensi dell'art. 31, cpv. 2, lett. a, LTC 
(Legge del 30 aprile 1997 sulle telecomunicazioni [l.1]) e dell'art. 4, cpv. 2, OIT (Ordinanza sugli 
impianti di telecomunicazione [l.2]).  
Osservazione concernente l’immissi one in commercio al di fuori dalla Svizzera. Poiché la questa 
norma non è una norma armonizzata ai sensi della direttiva europea RED, non presuppone la 
conformità al requisito fondamentale concernente l’utilizzo efficace dello spettro al di fuori dalla 
Svizzera.  
Il resto del documento è scritto in lingua inglese.  
  NT-3003  
 
1000348814  4/17 
 1.2 Scope  
The present document specifies the technical characteristics, test methods, limits and the 
requirements for low power In- door DAB/DAB+ Repeaters. The present document is applicable to 
full-band , multi- block  and single- block DAB/DAB+ repeater systems operating on radio 
frequencies in the Band III (174 -230 MHz).  
1.3 References  
References are either specific (identified by date of publication and/or edition number or version 
number) or non -specific. For specific references, only the cited version applies. For non- specific 
references, the latest published version of the reference document (including any amendments) 
applies.  
1.4 Normative references  
The following referenced documents are necessary for the application of the present document.  
[1] ETSI EN 302 077- 1 " Electromagnetic compatibility and Radio spectrum Matters 
(ERM); Transmitting equipment for the Terrestrial - Digital Audio Broadcasting 
(T-DAB) service; Part 1: Technical characteristics and test methods"  
[2]  ETSI EN 300 401 "Radio Broadcasting Systems; Digital Audio Broadcasting 
(DAB) to mobile, portable and fixed receivers”  
[3] ETSI TR 100 028 (all parts) (V1.4.1): "Electromagnetic compatibility and Radio 
spectrum Matter s (ERM); Uncertainties in the measurement of mobile radio 
equipment characteristics".  
[4] ETSI EG 200 053 "Electromagnetic compatibility and Radio spectrum Matters 
(ERM); Radio site engineering for radio equipment and systems".  
1.5 Legal references  
The followi ng referenced documents are legal documents.  
[l.1] SR 784.10; Telecommunications Act of 30 April 1997 (TCA).  
[l.2] SR 784.101.2; Ordinance of 25 November 2015 on Telecommunications 
Installations ( FAV).  
[l.3] SR 784.101.21 / RIR0201- 35; Technical interfaces  regulations  In-door low 
power DAB/DAB+ Repeater Band III. The technical interface regulations are 
published in annex 2 of the decree of OFCOM on telecommunication equipment 
OOIT; SR 784.101.21.  
1.6 Informative references  
The following referenced documents are  not necessary for the application of the present 
document but they assist the user with regard to a particular subject area.  
[i.1] Directive 2014/53/EU of the European Parliament and of the Council of 16 April 
2014 relating to the making available on the market of radio equipment (RED) . NT-3003  
 
1000348814  5/17 
 2 Definitions and abbreviations  
2.1 Definitions  
For the purposes of the present document, the following terms and definitions apply:  
antenna port: port of an apparatus which is designed, in normal operation, to be connected to an  
antenna using coaxial cable 
block : a DAB block is a frequency channel 1.536 MHz wide.  
broadcasting service: radiocommunication service in which the transmissions are intended for 
direct reception by the general public  
cabinet radiation: radiation from an  enclosure containing, equipment, excluding radiation from 
connected antennas or cables  
class of emission: set of characteristics of an emission, designated by standard symbols, e.g. 
type of modulation of the main carrier, modulating signal, type of information to be transmitted, 
and also, if appropriate, any additional signal characteristics  
DAB/DAB+ repeater: directional Radio Frequency (RF) amplifier, which  is used to amplify and 
transmit a received DAB/DAB+ signal in the DAB frequency band (e.g si gnal from a DAB+ base 
station) . 
dBc:  decibels relative to the unmodulated carrier power of the emission 
NOTE:  In the cases, which  do not have a carrier, for example in some digital modulation schemes 
where the carrier is not accessible for measurement, the reference level equivalent to dBc is 
decibels relative to the mean power P.  
dBi: decibels relative to the hypothetical isotropic  antenna, which uniformly distributes energy in 
all directions  
enclosure port: physical boundary of the apparatus through which electromagnetic fields may 
radiate or impinge  
NOTE:  In the case of integral antenna equipment, this port is inseparable from the antenna port.  
full-band repeater: repeater, which is designed for retransmitting the whole Band III Frequency 
(174 – 230 MHz; block  5A to block  12D). Repeater, which is designed for operation on a subset 
of Band III, is not considered as a full-band repeater; it is a multi -block  repeater or a single -block  
repeater.  
harmonic: component of order greater than 1 of the Fourier series of a periodic quantity  
intermodulation products: unwanted frequencies resulting from intermodulation between 
carriers or harmonics of emission, or between any oscillations generated to produce the carrier  
mean power: average power supplied to the antenna port by a transmitter during an interval of 
time sufficiently long compared with the lowest frequency encountered in the modulation 
envelope taken under normal operating conditions  
multi -block repeater : repeater which is designed for operation on more than one DAB/DAB+ 
frequency block .  
necessary bandwidth: for a given class of emission, the width of the frequency band which is 
sufficient to ensure the transmission of information at the rate and with the quality required under 
specified conditions  
rated output power: power that the transmitter or repeater  shall deliver at its output under 
specified conditions of operation  
maximum total radiated power: maximum  power that the repeater together with the transmit 
assembly antenna shall radiate under specified conditions of operation NT-3003  
 
1000348814  6/17 
 reference bandwidth: bandwidth in which the emission level is specified 
RMS power:  the apparent power of an AC power that is calculated by multiplying root -mean -
square (rms) current by the root mean square voltage  
single -block  repeater: repeater which is designed for operation on a single DAB/DAB+ 
frequency block .  
spurious emissions: emissions 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 
and intermodulati on products.  
2.2  Abbreviations  
For the purposes of the present document, the following abbreviations apply:  
BER  Bit Error Ratio  
COFDM  Coded Orthogonal Frequency Division Multiplex  
CW Continuous Wave  
EMC  ElectroMagnetic Compatibility  
EUT  Equipment Under Test  
Hz Hertz (cycles per second)  
IEC International Electrotechnical Commission  
IF Intermediate Frequency  
ITU International Telecommunications Union  
PRBS  Pseudo Random Binary Sequence  
R&TTE  Radio and Telecommunications Terminal Equipment  
RF Radio Frequency  
rms root mean square  
SFN Single Frequency Network  
T-DAB  Terrestrial - Digital Audio Broadcast 
Tx Transmitter  
VHF  Very High Frequency  
W Watt 
  NT-3003  
 
1000348814  7/17 
 3 Technical requirements specifications and limits  
3.1 Introduction  
Any low power DAB/DAB+ repeater shall amplify one or more DAB RF frequency block s, the 
transmit frequency shall be the same as the receive frequency.  
The apparatus shall include filters  to obtain the necessary protection against the users of 
adjacent freq uency bands and to ensure that the spurious emissions and intermodulation 
products of the low power DAB/DAB+ repeater remain within the limits. The repeater shall 
operate within the frequency bands defined in  the Technical interfaces regulations  for In-door low 
power DAB/DAB+ Repeaters Band III; RIR0201- 35 [l.3].  
Receive antenna (located generally outside the building) and transmit antenna (located inside the 
building) gain and directivity  shall be specified by the manufacturer of the low power DAB/D AB+ 
repeater.  
The gain characteristics of this antennal shall be :  
- receive antenna gain shall be equal or higher than + 7 dBi. 
- transmit antenna gain shall not exceed + 6 dBi.  
The repeater may have a gain regulation to enable the correct gain adjustment according the 
received signal strength, the cable attenuation, and the antenna coupling factor  (indoor antenna - 
outdoor antenna).  This may be a manual and/or an automatic adjustment mechanism.  
The coaxial cable used between receive antenna (outside the building) and the other parts of the 
repeater shall have good shielding effectiveness to avoid any feedback loop (TX to RX via the 
coaxial cable). The shielding effectiveness of this coaxial cable shall be better than 50 dB 
within the operating range of the repeater.   
3.2 Basic rules, EG 200 053  
The basic rules described in the ETSI guide "Radio site engineering for radio equipment and 
systems in the mobile service, EG 200 053" [4] apply to equipment  that fall within the scope of 
this document. The rules stated in clause 5.5 "Repeaters", where installation recommendations 
(clause 5.5.4) are listed are particularly noteworthy. For example,  these rules are applicable:  
- antenna coupling,  
- maximum gain (which will depend on the antennas coupling loss or isolation),  
- necessary isolation between several systems,  
- the use of filters to obtain the necessary protection against co- located 
radiocommunication equipment,  
- etc. 
Annexe H, "Equipment used to avoid radio frequency problems", will provide useful information 
on the connection between several radiocommunication equipment.  
Annexe N, "Radiocommunication in confined spaces", applies particularly to equipment intended 
to be operated in tunnels and confined spac es. 
The design principle, the installation rules, the specification calculation described in the  
EG 200 053 are to be considered and taken into account.  NT-3003  
 
1000348814  8/17 
 3.3 Environmental profile 
The technical requirements of the present document apply under the environmental profile for 
operation of the equipment, which shall be declared by the manufacturer of the equipment. The 
equipment shall comply with all the technical requirements of the present document at all times 
when operating within the boundary limits of the dec lared operational environmental profile.  
3.4 Nominal DAB RF-test signal  
A nominal DAB RF -test signal according EN 300 401 [2] clause 15.3 for transmission mode I and 
fulfilling the critical mask defined in EN 300  401 [2] clause 15.4 shall be applied to the RX  
antenna port, the level of this signal shall be set to produce the nominal TX output power 
(according to manufacturer's declaration) .  
The frequency of this RF -test signal shall be adjusted according the description of each test 
procedure below.   
3.5 Interpre tation of the measurement results 
The interpretation of the results recorded in a test report for the measurements described in the 
present document shall be as follows:  
- the measured value compared to the corresponding limit shall be used to decide 
whether  an equipment meets the requirements of the present document;  
- the value of the measurement uncertainty for the measurement of each parameter 
shall be included in the test report;  
For the test methods, according to the present document, the measurement unce rtainty figures 
shall be calculated in accordance with TR 100 028 [3] and shall correspond to an expansion 
factor (coverage factor) k = 1,96 or k = 2 (which provide confidence levels of 95  % respectively  
95,45 % in the case where the distributions charact erizing the actual measurement uncertainties 
are normal (Gaussian)).  
The particular expansion factor used for the evaluation of the measurement uncertainty shall be 
stated in the report.  
3.6 Requirements , limits and test procedure 
3.6.1  Maximal radiated total power  
3.6.1.1  Definition  
The total power of the signal of a T -DAB repeater is defined as the long- term average of the time -
varying short -term signal power.  
For full-band repeater, the total power of the signal of a T -DAB Band III repeater is the radiated 
power resulting the simultaneous application of several signals to the RX port of this repeater.  
For multi- block  or single -block  repeaters, the total power of the signal of a T -DAB Band III 
repeater is the radiated power resulting the application of a single sig nal to the RX port of this 
repeater.   
For devices with a permanent 50 Ω or 75 Ω TX antenna connector the maximum declared TX 
antenna gain “G” in dB has to be taken into account to determine the maximal radiated total 
power “P” in dBm as follows.  
P = A + G  
Whereas “A” is the maximum output power in dBm that the repeater delivers at its TX antenna 
port. 
For devices without a permanent 50 Ω or 75 Ω port, the effective radiated power shall be 
measured.  NT-3003  
 
1000348814  9/17 
 3.6.1.2  Limit  
3.6.1.2.1  Limit applicable to full -band repeater  
The m aximal radiated total power  shall not exceed - 5.15 dBm ( 305 µW) erp  
3.6.1.2.2  Limit applicable to all repeater except  full-band repeater  
The m aximal radiated total power  shall not exceed - 12.15 dBm  (61 µW) erp. 
3.6.1.3  Conformance  
3.6.1.3.1  Full-band repeater  
The repeater shall be set to maximum gain. Five  nominal DAB RF -test signal s according clause 
3.4 of this document shall be applied simultaneously vi a a coupling device to the RX antenna 
port, the level of this signal shall be increased by 10 dB.  The frequency of the 5 DAB RF -test 
signal should be:  
1st test signal : Fc = 174.928 MHz ( Block  5A) 
2nd test signal: Fc = 188.928 MHz ( Block  7A) 
3rd test signal: Fc = 202.928 MHz ( Block  9A) 
4th test signal: Fc = 216.928 MHz ( Block  11A)  
5th test signal: Fc = 229.072 MHz ( Block  12D)  
Alternatively, five RF CW signal s may be applied. The level of these  RF CW signal s shall be 
adjusted 10 dB higher than the  one producing the nominal TX output power, the frequency being 
the same as described above for the DAB RF -test signal s. 
For the maximal output power measurements , a thermal power meter shall be used.  
For devices having a permanent antenna connector,  the maximal output power is measured at 
the TX antenna port of the repeater.  
The maximum radiated power shall be tested under following operational conditions:  
- nominal supply voltage 
The obtained results shall be compared to the limits in clause 3.6.1.2.1  in order to prove 
compliance with the requirement.  
3.6.1.3.2  all repeater except Full -band repeater  
The repeater shall be set to maximum gain. A nominal DAB RF- test signal according clause 3.4  
of this document shall be applied to the RX antenna port, the level of this signal shall be 
increased by 10 dB.  
The frequency of this RF -test signal shall correspond to the centre frequency of the single -bloc 
repeater. For multi -block  repeater, tests should be carried out on the nominal frequency of the 
lowest frequency DAB block within the declared repeater frequency band; and repeated on the 
nominal frequency of the highest frequency DAB block  within the declared repeater frequency 
band.  
Alternatively, a RF CW signal may be applied. The level of this RF CW signal shall be adjusted 
10 dB higher than the one producing the nominal TX output power, the frequency being the same 
as described above for the DAB RF- test signal.  
For the maximal output power measurements a thermal power meter shall be used.  
For devices having a permanent antenna connector,  the maximal output power is measured at 
the TX antenna port of the repeater.  
The maximum radiated power shall be tested under following operational conditions:  
- nominal supply voltage NT-3003  
 
1000348814  10/17 
 The obtained results shall be compared to the limits in clause 3.6.1.2.2  in order to prove 
compliance with the requirement.  
 
3.6.2  Intermodulation products  
3.6.2.1  Definition  
This test shall be used to verify that the  level of intermodulation products, generated in non- linear 
elements of the repeater, in the presence of several RF input signals, do not exceed the specified 
limits.  
For the purposes of the present document,  intermodulation products are emissions at frequencies 
within the repeater's operating band . 
For devices with a permanent 50 Ω or 75 Ω TX antenna connector the maximum declared TX 
antenna gain “G” in dBi  has to be taken into account to determine the maximal radiated power of 
the intermodulation products “P Radiated of product #n ” as follows.  
PRadiated of product #n  = A Conducted of product #n  + G 
Whereas the maximum output power “A Conducted of product #n ” in dBm is the power of a intermodulation 
product that the repeater delivers at its TX antenna port.  
3.6.2.2  Limit  
The radiated power of any detected intermodulation product shall not exceed - 54 dBm erp.  
3.6.2.3  Conformance  
The measurements shall be performed  on TX antenna port of the repeater. For devices without a 
permanent 50 Ω or 75 Ω port, the effective radiated power of the intermodulation products shall 
be measured.  
The repeater shall be set to maximum gain.  
The measurement shall be performed with an RMS detector and a bandwidth of 100 kHz.  
3.6.2.4  Step 1, In band stimulus signals  
Two continuous sinusoidal RF signals shall be fed to the input antenna port of the repeater using 
a combining device.  
The frequencies of both RF signals shall be within the repeater's operating band. The spacing 
between both RF signals shall be lower than a DAB block  (e.g. 400 kHz). The input signals and 
resulting third order product shall be within the declared operational frequency band of the 
repeater.  
The level of both RF input signals shall be increased simultaneously, until the maximum rated 
output power, as declared by the manufacturer, is reached.  
The level of the intermodulation products shall be measured by means of a selective 
measurement device (e.g. spectrum analy ser) presenting to the repeater a load with an matched 
impedance of either 50 Ω or 75 Ω. 
The test shall be repeated with both RF input signals increased by 10 dB each.  
NOTE:  In this case, the automatic gain (level) control may reduce the gain to a value less than maximum gain 
in order to keep the maximum rated output power per channel, as declared by the manufacturer.  
The obtained results shall be compared to the limits in clause 3.6.2.2  in order to prove 
compliance with the requirement  NT-3003  
 
1000348814  11/17 
 3.6.2.5  Step 2, Out of band stimulus signals  
Two continuous sinusoidal RF signals shall be fed to the input antenna port of the repeater using 
a combi ning device.  
The frequencies of both RF signals shall be outside the repeater's operating band. The first signal 
has to be adjusted to 169.500 MHz, the second one being adjusted to (2 x 169.500 MHz) -  FC;  
FC is the centre frequency of the lowest DAB block  contained into the defined repeater band. The 
resulting third order product shall be within the declared operational frequency band of the 
repeater.  
The level of both RF input signals shall be set to -20 dBm.  
The level of the intermodulation products shal l be measured by means of a selective 
measurement device (e.g. spectrum analyser) presenting to the repeater a load with an matched 
impedance of either 50 Ω or 75 Ω. 
The obtained results shall be compared to the limits in clause 3.6 .2.2 in order to prove 
compliance with the requirement . 
3.6.3  Spurious emissions  
3.6.3.1  Definition  
This test shall be used to verify that the level of spurious emissions (measured at TX -antenna 
port as  well as cabinet radiation) in the presence of RF input signal do not exceed the specified 
limits.  
For devices with a permanent 50 Ω or 75 Ω TX the maximum declared TX antenna gain “G” in 
dBi has to be taken into account to determine the maximal radiated power of the spurious 
emissions “P Radiated spurious emission #n ” as follows.  
PRadiated spurious emission #n  = A Conducted spurious emission #n  + G 
Whereas:  
AConducted spurious emission #n   is the maximum output power in dBm of a spurious emission that the  
 repeater delivers at its TX antenna port.  
3.6.3.2  Limit  
Effective radiated power of spurious emissions and cabinet radiation in the frequency range  
30 MHz to 1 GHz (radiated) and 9 kHz to 1 GHz (conducted) shall not exceed - 68 dBm erp.  
This limit applies to frequencies outside the range fC ± 3 MHz , where fC is the centre frequency of 
the RF- test signal or RF CW signal used , irrespective of the number of carriers employed.  
3.6.3.3  Conformance  
Conducted spurious emission shall be tested between 9 kHz and 1 GHz, and radiated spurious 
emission shall be tested between 30 MHz and 1 GHz.  
The repeater shall be set to maximum gain. A nominal DAB RF- test signal according clause 3.4  
of this document shall be applied to the RX antenna port.  
The frequency of this RF -test signal shall correspond to :  
- Single -block repeater: the nominal frequency of the repeater under test or  
- Multi-block  repeater : tests should be carried out on the nominal frequency of the 
lowest frequency DAB block  within the declared repeater frequency band; and 
repeated on the nominal frequency of the highest frequency DAB block  within the 
declared repeater frequency band.  NT-3003  
 
1000348814  12/17 
 - Full-band repeater: tests should be carried out on the five frequencies listed under 
3.6.1.3.1 . 
 
Alternatively, a RF CW signal may be applied. The level of this RF CW signal shall be adjusted to 
produce the nominal TX output power.  
The measurement shall be performed with an RMS detector and a bandwidth of 100 kHz.  
The obtained results shall be compared to the limits in clause 3.6.3.2  in order to prove 
compliance with the requirement  
3.6.4  Repeater in -band gain 
3.6.4.1  Definition  
This requirement covers the net gain of the repeater inside the declared transmit frequency band.  
The gain of  the repeater is defined as total gain of the equipment, including receiving and 
transmitting antennas, filters, cables and amplifiers.  
The maximum in- band gain has been set to a value that limits the risk of self oscillation due to 
feedback loop over the  air between the transmitting and the receiving antenna.  
For equipments without embedded RX and TX antennas the maximum in- band gain “ GMaximum “ in 
dB shall be calculated as follows:  
GMaximum  = G Conducted measurement + G TX + G RX 
Whereas:  
G Conducted measurement   is the maximum gain measured according  clause 3.6.4.3  
GTX  is the maximum declared TX antenna gain  
GRX  is the maximum declared RX antenna gai n 
3.6.4.2  Limits  
The in -band gain of the repeater equipment shall not exceed 44 dB.  
3.6.4.3  Conformance  
For equipments that include filters, cables or similar relevant components these components shall 
be included in the measurement path.  
For equipments  without embedded RX and TX antennas the measurement shall be performed 
without antennas.  
1) The repeater shall be set to maximum gain.  
2) A continuous sinusoidal RF signal shall be fed into the RX -antenna input port of the 
repeater.  
3)  The frequency should be :  
- single -block  repeater : the centre frequency of the single -block  repeater or  
- multi- block  repeater : the centre  frequency of the lowest DAB block  within the declared 
repeater frequency band and repeated on the centre frequency of the highest DAB 
block  within the declared repeater frequency band of the multi -block  repeater  or 
- full-band repeater : the centre frequency of the lowest DAB block  (174.928 MHz) and 
repeated on the centre frequency of Band III (202 MHz) and on the centr e frequency 
of the highest DAB block  (229. 072 MHz) for full-band repeater.  NT-3003  
 
1000348814  13/17 
 4) The power level of the RF input signal applied should be at least 5 dB below the nominal 
power level , which would produce, when applied within the pass band, maximum rated 
output power, as declared by the manufacturer. This is to ensure that the equipment is 
operating in the linear output range.  
3) The average output power in each case shall be measured and the net gain shall be 
recorded.  
The results obtained shall be compared to t he limits in clause 3.6.4.2  in order to prove 
compliance.  
3.6.5  Repeater out of band gain  
3.6.5.1  Definition  
This requirement covers the net gain of the repeater outside the declared transmit frequency 
band.  
The gain of the repeater is defined as total gain of the equipment, including receiving and 
transmitting antennas, filters, cables and amplifiers.  
The out of band gain of DAB repeater has been set to prevent other applications to be disturbed 
by DAB repeaters. Neighbour applications like Paging base stations, PMR, or others should not 
produce or suffer of any unnecessary disturbance due to the proximity of a DAB repeater.  
For equipments without embedded RX and TX antennas the maximum in- band gain “ GMaximum “ in 
dB shall be calculated as follows:  
GMaximum  = G Conducted measurement + G TX + G RX 
Whereas:  
G Conducted measurement   is the maximum gain measured according  clause 3.6.4.3  
GTX  is the maximum declared TX antenna gain  
GRX  is the maximum declared RX antenna gain  
  NT-3003  
 
1000348814  14/17 
 3.6.5.2  Limits  
The out of band gain of the repeater equipment shall not exceed the limits shown in table 1 and 
table 2.  
Table 1: Frequency dependent gain limits  
Frequency  Maximum Gain  
< F L - 8 MHz  0 dB 
FL - 8 MHz to F L - 2 MHz  10 dB  
FL - 2 MHz to F L the in -band gain limit applies  
FH to F H + 2 MHz  the in -band gain limit applies  
FH + 2 MHz to F H + 8 MHz  10 dB 
> F H + 8 MHz  0 dB 
 
where F L and F H are: 
- single -block  repeater : FL = the lower frequency  of the repeater DAB block  and FH = 
the upper frequency of the repeater DAB block ; 
- multi- block  repeater:  FL =  the lower frequency of the lowest DAB block  contained into 
the defined repeater band and FH = the upper frequency of the highest DAB block  
contained into the defined repeater band.  
- full-band repeater: F L = 174.160 MHz and F H = 229.840 MHz  
 
Table 2: Fixed frequency limits  
 Frequency  Maximum Gain  
242.500 MHz to 243.500 MHz  0 dB 
3.6.5.3  Conformance  
For equipments that include filters, cables or similar relevant components these components shall 
be included in the measurement path.  
For equipments without embedded RX and TX antennas the measurement shall be  performed 
without antennas.  
1) The repeater shall be set to maximum gain.  
2) A continuous sinusoidal RF signal shall be fed successively into the RX -antenna input. 
Whereas the frequency offsets Y shown below from the edges of the relevant transmit 
frequency band FL and FH defined in table 1 in the clause 0  of the present document shall 
be used.  
 The frequency offsets Y shall have the following values : 
- 2 MHz;  
- 8 MHz;  
- 16 MHz;  
- 32 MHz  
The power level of the RF input signal applied should be at least 5 dB below the nominal 
power level which would produce, when applied at the centre frequency  (½ (FL + F H)), the 
maximum rated output power as declared by the manufacturer. This is to ensure that the 
equipment is operating in the linear output range.  NT-3003  
 
1000348814  15/17 
 3) The test shall be repeated at  
- 242.500 MHz;  
- 243.000 MHz and  
- 243.500 MHz  
with the power level of the RF input signal as defined in point 2) above.  
4) The average  output power in each case shall be measured and the net gain shall be 
recorded.  
The results obtained shall be compared to the limits in clause 3.6.5.2  in order to prove 
compliance.  
4 Repealed documents  
NT-3003 V1.0.0  
NT-3003 V1. 1.0 
Biel/Bienne, xx.xx. 2020 
Federal Office of Communications  
Philipp Metzger  
Director  
 
 
  NT-3003  
 
1000348814  16/17 
 Annex A (normative):  
Requirements and conformance test specifications table  
The Requirements and conformance Test specifications Table in table A.1 serves a number of 
purposes, as follows:  
- it provides a statement of all the essential requirements in words and by cross 
referenc e to (a) specific clause(s) in the present document or to (a) specific clause(s) 
in (a) specific referenced document(s);  
- it qualifies each requirement to be either:  
- Unconditional: meaning that the requirement applies in all circumstances; or  
- Conditional: m eaning that the requirement is dependent on the manufacturer having 
chosen to support optional functionality defined within the schedule;  
- in the case of Conditional requirements, it associates the requirement with the 
particular optional service or functionality;  
Table A.1: Requirements and conformance Test specifications Table  
The following requirements and test specifications are relevant to the presumption of conformity 
under the article 7 paragraph 2  TIO (Ordinance on Telecommunications Installations [l.2])  
Requirement  Requirement Conditionality  Test Specification  
No Description  Reference: 
Clause No  U/C Condition  Reference:  
Clause No  
1 Maximal radiated total  
power  3.6.1  U  3.6.1.3  
2 Intermodulation 
products  3.6.2  U  3.6.2.3  
3 Spurious emissions  3.6.3  U  3.6.3.3  
4 Repeater in -band 
gain 3.6.4  U  3.6.4.3  
5 Repeater out of band 
gain 3.6.5  U  3.6.5.3  
 
Key to columns:  
Requirement:  
No A unique identifier for one row of the table which may be used to identify a 
requirement or its test specification.  
Description  A textual reference to the requirement.  
Clause Number  Identification of clause(s) defining the requirement in the present document 
unless another document is referenced explicitly.  
Requirement Conditionality:  
U/C Indicates whether the requirement is to be unconditionally  applicable (U) or is 
conditional  upon the manufacturers claimed functionality of the equipment 
(C). NT-3003  
 
1000348814  17/17 
 Condition  Explains the conditions when the requirement shall or shall not be applicable 
for a technical requirement which is classified "conditional".  
Test Specification:  
Clause Number  Identific ation of clause(s) defining the test specification in the present 
document unless another document is referenced explicitly. Where no test is 
specified (that is, where the previous field is "X") this field remains blank.  