SIST EN 303 364-1-1 V1.1.1:2025

HARMONISED EUROPEAN STANDARD
Primary Surveillance Radar (PSR);
Harmonised Standard for access to radio spectrum;
Part 1: Air Traffic Control (ATC) PSR sensors operating in the
frequency band 1 215 MHz to 1 400 MHz (L band);
Sub-part 1: radar systems using reflector antennas

2 ETSI EN 303 364-1-1 V1.1.1 (2025-06)

Reference
DEN/ERM-TGAERO-31-1
Keywords
aeronautical, harmonised standard, radar, radio
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ETSI
3 ETSI EN 303 364-1-1 V1.1.1 (2025-06)
Contents
Intellectual Property Rights . 5
Foreword . 5
Modal verbs terminology . 6
1 Scope . 7
2 References . 7
2.1 Normative references . 7
2.2 Informative references . 7
3 Definition of terms, symbols and abbreviations . 8
3.1 Terms . 8
3.2 Symbols . 9
3.3 Abbreviations . 10
4 Technical requirements specifications . 11
4.1 Environmental profile . 11
4.2 Conformance Requirements . 11
4.2.1 Transmitter requirements . 11
4.2.1.1 Occupied bandwidth. 11
4.2.1.1.1 Definition. 11
4.2.1.1.2 Limits . 11
4.2.1.1.3 Conformance . 11
4.2.1.2 Transmitter Peak Power . 11
4.2.1.2.1 Definition. 11
4.2.1.2.2 Limits . 11
4.2.1.2.3 Conformance . 11
4.2.1.3 Measured B bandwidth . 11
-40
4.2.1.3.1 Definition. 11
4.2.1.3.2 Limits . 12
4.2.1.3.3 Conformance . 12
4.2.1.4 Unwanted emissions. 12
4.2.1.4.1 General requirements . 12
4.2.1.4.2 Out-of-band Emissions . 12
4.2.1.4.3 Emissions in the spurious domain . 14
4.2.1.4.4 Stand-by mode emissions . 14
4.2.2 Receiver requirements . 15
4.2.2.1 General requirement . 15
4.2.2.2 System Noise Figure . 15
4.2.2.2.1 Definition. 15
4.2.2.2.2 Limits . 15
4.2.2.2.3 Conformance . 15
4.2.2.3 Receiver Compression Level . 15
4.2.2.3.1 Definition. 15
4.2.2.3.2 Limits . 16
4.2.2.3.3 Conformance . 16
4.2.2.4 Receiver selectivity . 16
4.2.2.4.1 Definition. 16
4.2.2.4.2 Limit . 16
4.2.2.4.3 Conformance . 17
4.2.2.5 Receiver non-linearity . 17
4.2.2.5.1 Definition. 17
4.2.2.5.2 Limits . 18
4.2.2.5.3 Conformance . 18
5 Testing for compliance with technical requirements . 18
5.1 Environmental conditions for testing . 18
5.1.1 General requirements . 18
5.1.2 Test conditions . 18
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4 ETSI EN 303 364-1-1 V1.1.1 (2025-06)
5.1.2.1 Thermal Balance . 18
5.1.2.2 Environmental Test Conditions . 18
5.1.2.2.1 Temperature and humidity. 18
5.1.2.2.2 Power supply (AC only) . 19
5.2 Radio test suites . 19
5.2.1 Transmitter test specification . 19
5.2.1.1 Occupied bandwidth. 19
5.2.1.2 Transmitter Peak Power . 19
5.2.1.3 Measured B bandwidth . 20
-40
5.2.1.4 Unwanted emissions. 20
5.2.1.4.1 Out-of-band Emissions . 20
5.2.1.4.2 Emissions in the spurious domain . 21
5.2.1.4.3 Stand-by mode emissions . 21
5.2.1.5 Pulse Length . 21
5.2.1.6 Pulse Rise Time . 22
5.2.1.7 Pulse Fall Time . 22
5.2.2 Receiver test specification . 23
5.2.2.1 System Noise Figure . 23
5.2.2.2 Receiver Compression Level . 23
5.2.2.2.1 General setup . 23
5.2.2.2.2 Test Signal . 23
5.2.2.2.3 Measurement Procedure . 23
5.2.2.3 Receiver selectivity . 24
5.2.2.3.1 General setup . 24
5.2.2.3.2 Disturbing Test Signals . 24
5.2.2.3.3 Measurement Procedure . 24
5.2.2.4 Receiver non-linearity . 24
Annex A (informative): Relationship between the present document and the essential
requirements of Directive 2014/53/EU . 26
Annex B (normative): Calculation of the B bandw idth . 28
-40
Annex C (normative): Occupied bandwidth and B measurement set-up . 30
-40
Annex D (normative): Transmitter Peak Power measurement set-up . 31
Annex E (normative): Out-of-Band Emissions measurement set-up . 32
Annex F (normative): Spurious Emissions and Stand-By Mode emissions measurement set-
up . 33
Annex G (normative): Pulse Length, Pulse Rise Time and Pulse Fall time measurement set-
up . 35
Annex H (normative): System Noise Figure measurement set-up . 36
Annex I (normative): Compression level measurement set-up . 38
Annex J (normative): Selectivity measurement set-up . 39
Annex K (normative): Receiver non-linearity measurement set-up . 40
Annex L (informative): Maximum Measurement Uncertainty . 41
Annex M (informative): Checklist . 42
Annex N (informative): Bibliography . 44
History . 45

ETSI
5 ETSI EN 303 364-1-1 V1.1.1 (2025-06)
Intellectual Property Rights
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Foreword
This Harmonised European Standard (EN) has been produced by ETSI Technical Committee Electromagnetic
compatibility and Radio spectrum Matters (ERM).
The present document has been prepared under the Commission's standardisation request C(2015) 5376 final [i.2] to
provide one voluntary means of conforming to the essential requirements of Directive 2014/53/EU on the harmonisation
of the laws of the Member States relating to the making available on the market of radio equipment and repealing
Directive 1999/5/EC [i.1].
Once the present document is cited in the Official Journal of the European Union under that Directive, compliance with
the normative clauses of the present document given in Table A.1 confers, within the limits of the scope of the present
document, a presumption of conformity with the corresponding essential requirements of that Directive, and associated
EFTA regulations.
The present document is part 1, sub-part 1, of a multi-part deliverable covering Primary Surveillance Radar (PSR), as
identified below:
Part 1: "Air Traffic Control (ATC) PSR sensors operating in the frequency band 1 215 MHz to 1 400 MHz
(L band)";
Sub-part 1: "radar systems using reflector antennas";
Sub-part 2: "radar systems using phased array antennas".
Part 2: "Air Traffic Control (ATC) PSR sensors operating in the frequency band 2 700 MHz to 3 100 MHz
(S band)";
Part 3: "Air Traffic Control (ATC) PSR sensors operating in the frequency band 8 500 MHz to 10 000 MHz
(X band)".
ETSI
6 ETSI EN 303 364-1-1 V1.1.1 (2025-06)
National transposition dates
Date of adoption of this EN: 10 June 2025
Date of latest announcement of this EN (doa): 30 September 2025
Date of latest publication of new National Standard
or endorsement of this EN (dop/e): 31 March 2026
Date of withdrawal of any conflicting National Standard (dow): 31 March 2027

Modal verbs terminology
In the present document "shall", "shall not", "should", "should not", "may", "need not", "will", "will not", "can" and
"cannot" are to be interpreted as described in clause 3.2 of the ETSI Drafting Rules (Verbal forms for the expression of
provisions).
"must" and "must not" are NOT allowed in ETSI deliverables except when used in direct citation.

ETSI
7 ETSI EN 303 364-1-1 V1.1.1 (2025-06)
1 Scope
The present document specifies technical characteristics and methods of measurements for ground based monostatic
ATC solid state primary surveillance radars that are intended to work with a waveguide-based rotating passive antenna
and have the following characteristics:
• operation in the 1 215 MHz to 1 400 MHz frequency range;
• transmitter output peak power up to 100 kW;
• the transceiver output uses an RF circulator;
• a piece of waveguide of at least 66 cm is integral to the transceiver.
NOTE 1: Phased array ATC primary surveillance radars are not covered by the present document.
NOTE 2: 66 cm equals 2 times the cut-off wavelength of a WR650/WG6/R14 waveguide which is typically used in
the 1 215 MHz to 1 400 MHz frequency range.
NOTE 3: The relationship between the present document and essential requirements of article 3.2 of
Directive 2014/53/EU [i.1] is given in Annex A.
2 References
2.1 Normative 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 version of the
referenced document (including any amendments) applies.
Referenced documents which are not found to be publicly available in the expected location might be found in the
ETSI docbox.
NOTE: While any hyperlinks included in this clause were valid at the time of publication, ETSI cannot guarantee
their long term validity.
The following referenced documents are necessary for the application of the present document.
[1] ETSI EN 300 019-1-3 (V2.4.1) (04-2014): "Environmental Engineering (EE); Environmental
conditions and environmental tests for telecommunications equipment; Part 1-3: Classification of
environmental conditions; Stationary use at weather protected locations".
2.2 Informative 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 version of the
referenced document (including any amendments) applies.
NOTE: While any hyperlinks included in this clause were valid at the time of publication, ETSI cannot guarantee
their long-term validity.
The following referenced documents may be useful in implementing an ETSI deliverable or add to the reader's
understanding, but are not required for conformance to the present document.
[i.1] Directive 2014/53/EU of the European Parliament and of the Council of 16 April 2014 on the
harmonisation of the laws of the Member States relating to the making available on the market of
radio equipment and repealing Directive 1999/5/EC.
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8 ETSI EN 303 364-1-1 V1.1.1 (2025-06)
[i.2] Commission Implementing Decision C (2015) 5376 final of 4.8.2015 on a standardisation request
to the European Committee for Electrotechnical Standardisation and to the European
Telecommunications Standards Institute as regards radio equipment in support of Directive
2014/53/EU of the European Parliament and of the Council.
[i.3] ITU Radio Regulations (2024).
[i.4] Recommendation ITU-R SM.1541-7 (09/2024): "Unwanted emissions in the out-of-band domain".
[i.5] ETSI EG 203 336 (V1.2.1): "Guide for the selection of technical parameters for the production of
Harmonised Standards covering article 3.1(b) and article 3.2 of Directive 2014/53/EU".
[i.6] IEC 60153-2 (2016): "Hollow metallic waveguides - Part 2: Relevant specifications for ordinary
rectangular waveguides".
[i.7] Recommendation ITU-R SM.331-4 (07/78): "Noise and sensitivity of receivers".
[i.8] Recommendation ITU-R SM.332-4 (07/78): "Selectivity of receivers".
[i.9] ECC Recommendation (02)05 (October 2012): "Unwanted emissions".
[i.10] ERC Recommendation 74-01 (May 2022): "Unwanted emissions in the spurious domain".
[i.11] Recommendation ITU-R M.1177-4 (04/2011): "Techniques for measurement of unwanted
emissions of radar systems".
3 Definition of terms, symbols and abbreviations
3.1 Terms
For the purposes of the present document, the following terms apply:
active state: state which produces the authorized emission
allocated frequency band: frequency range that regionally or nationally is allocated to one or more radio services on a
primary or secondary basis
chirp bandwidth: total frequency shift during the pulse generation of an FM/chirped radar
EXAMPLE: If the Frequency Modulation is from 1 250 MHz to 1 280 MHz, the chirp bandwidth is 30 MHz.
declared frequency band: band or bands within which the equipment under test is declared to operate
NOTE: The declared frequency band for a given region or country is always contained within the allocated
frequency band.
dummy load: device connected to a waveguide or coaxial cable and matched to their impedance (typically 50 Ω) to
absorb the RF energy propagating inside
Equipment Under Test (EUT): device that is the subject of the specific test investigation being described
idle/stand-by state: state where the transmitter is available for traffic, but is not in the active state
matched filter: receiver filter that matches the transmitted radar waveform, i.e. this is the filter that maximizes the
signal-to-noise ratio of the received pulse
necessary bandwidth: width of the frequency band which is just sufficient to ensure the transmission of information at
the rate and with the quality required under specified conditions for a given class of emission
NOTE 1: This definition is taken from ITU Radio Regulation [i.3].
NOTE 2: For Primary radars the necessary bandwidth B is considered to be B (20 dB bandwidth) as defined in
N -20
Recommendation ITU-R SM.1541-7 [i.4].
ETSI
9 ETSI EN 303 364-1-1 V1.1.1 (2025-06)
occupied bandwidth: width of a frequency band such that, below the lower and above the upper frequency limits, the
mean powers emitted are each equal to a specified percentage β/2 of the total mean power of a given emission
NOTE 1: Unless otherwise specified in an ITU-R Recommendation for the appropriate class of emission, the value
of β/2 should be taken as 0,5 %.
NOTE 2: This definition is taken from ITU Radio Regulations [i.3], chapter I, 1.153.
operating frequencies: frequencies on which the radar is tuned to operate
operating mode: predefined configuration for a given service accessible to the operator of the radar system
NOTE 1: Several operating modes may be available.
NOTE 2: Changing operating mode might affect the radio characteristics of the radar system.
Peak Envelope Power (PEP): average power supplied to the antenna transmission line by a transmitter during one
radio frequency cycle at the crest of the modulation envelope taken under normal operating conditions
NOTE: This definition is taken from ITU Radio Regulations [i.3], chapter I, 1.157.
product configuration: hardware variant of the same typology of system under test (e.g. different power outputs,
magnetrons)
pulse fall time: time taken for the trailing edge of the pulse to decrease from 90 % to 10 % of the maximum amplitude
(voltage)
pulse length: time between the 50 % amplitude (voltage) points
pulse rise time: time taken for the leading edge of the pulse to increase from 10 % to 90 % of the maximum amplitude
(voltage)
radar equipment: equipment and its associated primary navigational display intended for the navigation of aircraft in
airways
receiver output: output of the digital matched filter function
system coupler: directional waveguide coupler with forward and reverse port or only a forward port
NOTE: The system coupler is inserted in the waveguide run between the circulator and the antenna but not
directly located behind the antenna. Usually it is located very close behind the circulator.
unwanted emissions: consist of spurious emissions and out-of-band emissions
NOTE: This definition is taken from ITU Radio Regulation [i.3].
3.2 Symbols
For the purposes of the present document, the following symbols apply:
B -20 dB bandwidth below PEP of the spectrum of the transmitted waveform
-20
B -40 dB bandwidth below PEP of the spectrum of the transmitted waveform
-40
B Chirp bandwidth
C
B Measurement bandwidth
m
B Necessary bandwidth
N
B Reference bandwidth
ref
B 3 dB resolution bandwidth of transceiver
res
dB/dec dB per decade
dBm Power ratio expressed in decibels (dB) with reference to 1 milliwatt
dBpp Power ratio expressed in decibels (dB) with reference to peak power
f Operating Frequency
o
f Cut-off Frequency
co
f Intermediate Frequency
IF
f Receiver operating Frequency
RF
f Image Frequency
image
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10 ETSI EN 303 364-1-1 V1.1.1 (2025-06)
k Boltzmann's constant
f Local Oscillator Frequency
LO
Spectrum Peak Power
Pmeas
Pt Pulse power of transmission
RF Radio Frequency
S/N Signal-to-Noise ratio
t Pulse length
T Pulse length (of individual chirp waveforms) in seconds
C
tr Pulse rise time
tf Pulse fall time
T Temperature in Kelvin
β/2 Percentage of the total mean power of a given emission
λ Wavelength
3.3 Abbreviations
For the purposes of the present document, the following abbreviations apply:
AC Alternating Current
ATC Air Traffic Control
COF Cut-Off Frequency
CW Continuous Wave
DC Direct Coupling
EIA Electronic Industries Alliance
EN European Norm
ENR Excess Noise Ratio
EUT Equipment Under Test
FM Frequency Modulation
Hz Hertz
IEC International Electrotechnical Commission
IF Intermediate Frequency
IMD InterModulation Distortion
ITU-R International Telecommunications Union - Radiocommunications
kHz kiloHertz
kW kiloWatt
NA Not Available
NF Noise Factor
OoB Out-of-Band
PEP Peak Envelope Power
ppm parts per million
PSR Primary Surveillance Radar
RCL Receiver Compression level
RF Radio Frequency
SM Spectrum Management
STD Standard Deviation
SWT Sweep Time
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11 ETSI EN 303 364-1-1 V1.1.1 (2025-06)
4 Technical requirements specifications
4.1 Environmental profile
The technical requirements of the present document apply under the environmental profile for operation of the
equipment, which shall be in accordance with its intended use, but as a minimum, shall be that specified in the test
conditions contained in the present document. The equipment shall comply with all the technical requirements of the
present document at all times when operating within the boundary limits of the operational environmental profile
defined by its intended use.
4.2 Conformance Requirements
4.2.1 Transmitter requirements
4.2.1.1 Occupied bandwidth
4.2.1.1.1 Definition
Occupied bandwidth is the width of a frequency band such that, below the lower and above the upper frequency limits,
the mean powers emitted are each equal to a specified percentage β/2 of the total mean power of a given emission as
defined in ITU Radio Regulations [i.3], chapter I, 1.153.
4.2.1.1.2 Limits
The occupied bandwidth with β/2 = 0,5 % shall be maintained wholly within the declared frequency band.
NOTE: The value of β/2 = 0,5 % is taken from chapter I, 1.153 of the ITU Radio Regulations [i.3].
4.2.1.1.3 Conformance
The conformance tests are specified in clause 5.2.1.1.
4.2.1.2 Transmitter Peak Power
4.2.1.2.1 Definition
The transmitter peak power of a pulse radar is the peak value (PEP) of the transmitter pulse power during the
transmission pulse measured at the antenna flange (output port of the transmitter).
4.2.1.2.2 Limits
The transmitter peak power shall not exceed 100 kW (i.e. 80 dBm).
4.2.1.2.3 Conformance
The conformance tests are specified in clause 5.2.1.2.
4.2.1.3 Measured B-40 bandwidth
4.2.1.3.1 Definition
The measured -40 dB bandwidth (B ) is the measured bandwidth of the emissions 40 dB below the measured PEP.
-40
NOTE: Occupied bandwidth will be smaller than B for such equipment.
-40
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12 ETSI EN 303 364-1-1 V1.1.1 (2025-06)
4.2.1.3.2 Limits
The measured B bandwidth shall always be contained within the declared frequency band.
-40
4.2.1.3.3 Conformance
The conformance tests are specified in clause 5.2.1.3.
4.2.1.4 Unwanted emissions
4.2.1.4.1 General requirements
The Out-of-Band emission limits and the spurious emission limits shall be based on the calculated B bandwidth as
-40
defined in Annex B. The OoB and Spurious domain boundaries and limits are defined in clause 4.2.1.4.2.2.
B
-40 dB
Spurious domain OoB domain OoB domain

Figure 1: Definition of OoB and spurious emission domains (case of a single operating frequency)
(Not to scale)
4.2.1.4.2 Out-of-band Emissions
4.2.1.4.2.1 Definition
Out-of-Band (OoB) emissions refer to emissions in the region between the calculated B and the spurious domain.
-40
NOTE: The calculated B is defined in Annex B.
-40
4.2.1.4.2.2 Limits
For single frequency radars, the limits of emissions in the OoB domain frequency boundaries defined in Table 2, shall
be as specified in Table 1.
ETSI
40 dB
13 ETSI EN 303 364-1-1 V1.1.1 (2025-06)
Table 1: Limits for emissions in the OoB domain for single frequency radars
Frequency offset Δ Limit Slope
relative to B-40 dBpp (unless otherwise stated) dB/decade
0,5 ≤ Δ ≤ 5 -40 to -80 -40
5 < Δ ≤ 10,8 -80 to -100 / -30 dBm (see note 1) -60
NOTE 1: From -80 to -100 or -30 dBm whichever is less stringent).
NOTE 2: Frequency offset is a multiplicative factor of B-40 value.
NOTE 3: These limits are specified in ECC Recommendation (02)05 [i.9],
Annex 2, Table 3.
NOTE 4: B is calculated using the formulae in Annex B.
-40
Table 2: Out-of-Band emissions frequency boundaries for single frequency radars
Lower OoB measurement limit Upper OoB measurement limit
Maximum value between Operating frequency + 10,8 x B
-40
(Operating frequency - 10,8 x B )
-40
and fco x 0,7 MHz (see note 1)

NOTE 1: This value corresponds to the cut-off frequency of the equipment embedded piece of
waveguide times 0,7 as described in ERC Recommendation 74-01 [i.10].
NOTE 2: B is calculated using the formulae in Annex B.
-40
NOTE 3: Boundaries are specified in Annex 2 of ECC Recommendation (02)05 [i.9].

For multi frequency radars, the limits of emissions in the OoB domain frequency boundaries, defined in Table 4, shall
be as specified in Table 3.
Table 3: Limits for emissions in the OoB domain for multi frequency radars
Frequency offset Δ Limit Slope
relative to B dBpp dB/decade
-40
0,5 ≤ Δ ≤ 1,6 -40 to (-43 - 10 x log(PEP) / -60 dB (see note 1)) -40
NOTE 1: From -40 to -43 - 10 x log(PEP) or -60 dBpp whichever is less stringent.
NOTE 2: Frequency offset is a multiplicative factor of B-40 value.
NOTE 3: PEP unit is Watt.
NOTE 4: These limits are specified in ECC Recommendation (02)05 [i.9], Annex 2, Table 3.
NOTE 5: B is calculated using the formulae in Annex B.
-40
Table 4: Out-of-Band emissions frequency boundaries for multi frequency radars
Lower OoB measurement limit Upper OoB measurement limit
Maximum value between Operating frequency + 1,6 x B
-40
)
(Operating frequency - 1,6 x B
-40
and fco x 0,7 MHz (see note 1)
NOTE 1: This value corresponds to the cut-off frequency of the equipment embedded piece of
waveguide times 0,7 as described in ERC Recommendation 74-01 [i.10].
NOTE 2: B is calculated using the formulae in Annex B.
-40
NOTE 3: Boundaries are specified in Annex 2 of ECC Recommendation (02)05 [i.9].

For radars using multiple pulse waveforms, the emission mask shall be calculated for each individual pulse and the
widest mask shall be considered.
4.2.1.4.2.3 Conformance
The conformance tests are specified in clause 5.2.1.4.1.
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14 ETSI EN 303 364-1-1 V1.1.1 (2025-06)
4.2.1.4.3 Emissions in the spurious domain
4.2.1.4.3.1 Definition
Spurious emissions are unwanted emissions in the spurious domain. They include:
• harmonic emissions (i.e. whole multiples of the operating frequency);
• parasitic emissions;
• emissions from intermodulation products (e.g. between oscillator and operating frequency, or between
oscillator and harmonics);
• emissions from frequency conversion products.
For transmitters in active state, the spurious domain is all frequencies outside the OoB domain.
4.2.1.4.3.2 Limits
The spurious emissions limits in the frequency bands defined in Table 6 shall be as specified in Table 5.
Table 5: Limits for emissions in the spurious domain
Radar type Limits (see note 1)
Single frequency 100 dB or -30 dBm whichever is less stringent
Multi frequency 43 + 10 x log (PEP) or 60 dB whichever is less stringent
NOTE 1: Absolute levels (in dBm) in the reference bandwidth or attenuation (dB) below the power
(PEP) supplied to the antenna port.
NOTE 2: These limits are specified in ERC Recommendation 74-01 [i.10], Annex 5.

Table 6: measurement bands for the emissions in the spurious domain
Lower band measurement limits Upper band measurement limits
From fco x 0,7 MHz (see note 1) From the upper OoB boundary
th
to the lower OoB boundary To 5 harmonic of the operating frequency + Δ
(see note 2)
NOTE 1: The lower frequency corresponds to the COF of the equipment embedded piece of waveguide times
0,7 as described in ERC Recommendation 74-01 [i.10]. Measurement below this frequency are not
required due to the fact that power transfer below this frequency is negligible and therefore
measurements will not provide sound and repeatable results.
th
NOTE 2: The upper band measurement limit corresponds to the 5 harmonic of the highest operating
frequency, as defined in ERC Recommendation 74-01 [i.10], Table 1, plus a margin Δ corresponding
to the maximum Occupied bandwidth d defined in clause 4.2.1.1.2 and calculated according to the
�
following formula: Δ = 5 ×�� ×� � �, where fo is the highest operating frequency. For example
�
-6
with fo = 1 400 MHz, the margin Δ (in MHz) will be: 5 x 1 400 x 500 x 10 = 3,5 MHz and therefore
the measurement limit will extend up to 7 003,5 MHz.
NOTE 3: OoB frequency boundaries are specified in Table 2 (for single frequency radars) and Table 4 (for
multi frequency radars).
4.2.1.4.3.3 Conformance
The conformance tests are specified in clause 5.2.1.4.2.
4.2.1.4.4 Stand-by mode emissions
4.2.1.4.4.1 Definition
Stand-by mode emissions are residual emissions at the transceiver output when the transmitter is in stand-by mode. In
this mode, the transmitter is available for operation, but is not in the active state.
ETSI
15 ETSI EN 303 364-1-1 V1.1.1 (2025-06)
4.2.1.4.4.2 Limits
The stand-by mode emissions shall not exceed the limits specified in Table 7 (f is the measurement frequency).
NOTE: These limits are specified in Table 15 of Annex 5 of ERC Recommendation 74-01 [i.10].
Table 7: Stand-by mode emission limits
Frequency Range Limits
fco x 0,7 MHz (see note 1) ≤ f ≤ 1 GHz -57 dBm
th
1 GHz < f ≤ 5 harmonic of the operating frequency fo + Δ (see note 2) -47 dBm
NOTE 1: The lower frequency corresponds to the COF of the equipment embedded piece of waveguide
times 0,7 as described in ERC Recommendation 74-01 [i.10].
th
NOTE 2: The upper band measurement limit corresponds to the 5 harmonic of the highest of the
operating frequencies as defined in ERC Recommendation 74-01 [i.10], Table 1 plus a margin Δ
corresponding to the maximum Occupied bandwidth d defined in clause 4.2.1.1.2 and calculated
�
according to the following formula: Δ = 5 ×�� ×� �. For example with fo = 1 400 MHz, the
�
�
-6
margin Δ (in MHz) will be: 5 x 1 400 x 500 x 10 = 3,5 MHz and therefore the measurement limit
will extend up to 7 003,5 MHz.

4.2.1.4.4.3 Conformance
The conformance tests are specified in clause 5.2.1.4.3.
4.2.2 Receiver requirements
4.2.2.1 General requirement
The L-band ATC radars use an RF receiver inside the transceiver function and may use additional RF receivers
connected to the radar antenna receiving beams patterns. The receiver requirements shall be tested for all the receivers
of the radar.
4.2.2.2 System Noise Figure
4.2.2.2.1 Definition
The Noise Figure is the noise factor as defined below expressed in dB.
The noise factor is the ratio of noise power measured at the output of the receiver to the noise power which would be
present at the output if the thermal noise due to the resistive component of the source impedance were the only source
of noise in the system; both noise powers are determined at an absolute temperature of the source equal to T = 293 K.
NOTE: The definition of noise factor is taken from section 'Recommend 2' of Recommendation
ITU-R SM.331-4 [i.7].
4.2.2.2.2 Limits
The Noise Figure shall not exceed 6 dB.
4.2.2.2.3 Conformance
The conformance tests are specified in clause 5.2.2.1.
4.2.2.3 Receiver Compression Level
4.2.2.3.1 Definition
The compression level is defined as the level of the input signal at which one of the receiver stages becomes non-linear
thereby causing distortion and other non-linear effects that prevent proper operation of the receiver itself.
ETSI
16 ETSI EN 303 364-1-1 V1.1.1 (2025-06)
The receiver compression level is defined as the input power when the receiver gain is reduced by 1 dB (i.e. when the
receiver output is 1 dB into compression) as shown in Figure 2.

Figure 2: Receiver 1 dB compression point
4.2.2.3.2 Limits
The Receiver Compression level (RCL) of the radar shall be at least -40 dBm:
RCL ≥ -40 dBm (1)
4.2.2.3.3 Conformance
The conformance tests are specified in clause 5.2.2.2.
4.2.2.4 Receiver selectivity
4.2.2.4.1 Definition
The radar receiver selectivity is a measure of its ability to discriminate between a wanted signal to which the receiver is
tuned and unwan
...

SLOVENSKI STANDARD
01-september-2025
Primarni nadzorni radar (PSR) - Harmonizirani standard za dostop do radijskega
spektra - 1. del: Senzorji PSR za nadzor zračnega prometa (ATC), ki delujejo v
frekvenčnem pasu od 1215 MHz do 1400 MHz (pas L) - 1. poddel: Radarski sistemi
z reflektorskimi antenami
Primary Surveillance Radar (PSR) - Harmonised Standard for access to radio spectrum -
Part 1: Air Traffic Control (ATC) PSR sensors operating in the frequency band 1 215
MHz to 1 400 MHz (L band) - Sub-part 1: radar systems using reflector antennas
Ta slovenski standard je istoveten z: ETSI EN 303 364-1-1 V1.1.1 (2025-06)
ICS:
03.220.50 Zračni transport Air transport
33.060.99 Druga oprema za radijske Other equipment for
komunikacije radiocommunications
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

HARMONISED EUROPEAN STANDARD
Primary Surveillance Radar (PSR);
Harmonised Standard for access to radio spectrum;
Part 1: Air Traffic Control (ATC) PSR sensors operating in the
frequency band 1 215 MHz to 1 400 MHz (L band);
Sub-part 1: radar systems using reflector antennas

2 ETSI EN 303 364-1-1 V1.1.1 (2025-06)

Reference
DEN/ERM-TGAERO-31-1
Keywords
aeronautical, harmonised standard, radar, radio
ETSI
650 Route des Lucioles
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Tel.: +33 4 92 94 42 00  Fax: +33 4 93 65 47 16

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Sous-Préfecture de Grasse (06) N° w061004871

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ETSI
3 ETSI EN 303 364-1-1 V1.1.1 (2025-06)
Contents
Intellectual Property Rights . 5
Foreword . 5
Modal verbs terminology . 6
1 Scope . 7
2 References . 7
2.1 Normative references . 7
2.2 Informative references . 7
3 Definition of terms, symbols and abbreviations . 8
3.1 Terms . 8
3.2 Symbols . 9
3.3 Abbreviations . 10
4 Technical requirements specifications . 11
4.1 Environmental profile . 11
4.2 Conformance Requirements . 11
4.2.1 Transmitter requirements . 11
4.2.1.1 Occupied bandwidth. 11
4.2.1.1.1 Definition. 11
4.2.1.1.2 Limits . 11
4.2.1.1.3 Conformance . 11
4.2.1.2 Transmitter Peak Power . 11
4.2.1.2.1 Definition. 11
4.2.1.2.2 Limits . 11
4.2.1.2.3 Conformance . 11
4.2.1.3 Measured B bandwidth . 11
-40
4.2.1.3.1 Definition. 11
4.2.1.3.2 Limits . 12
4.2.1.3.3 Conformance . 12
4.2.1.4 Unwanted emissions. 12
4.2.1.4.1 General requirements . 12
4.2.1.4.2 Out-of-band Emissions . 12
4.2.1.4.3 Emissions in the spurious domain . 14
4.2.1.4.4 Stand-by mode emissions . 14
4.2.2 Receiver requirements . 15
4.2.2.1 General requirement . 15
4.2.2.2 System Noise Figure . 15
4.2.2.2.1 Definition. 15
4.2.2.2.2 Limits . 15
4.2.2.2.3 Conformance . 15
4.2.2.3 Receiver Compression Level . 15
4.2.2.3.1 Definition. 15
4.2.2.3.2 Limits . 16
4.2.2.3.3 Conformance . 16
4.2.2.4 Receiver selectivity . 16
4.2.2.4.1 Definition. 16
4.2.2.4.2 Limit . 16
4.2.2.4.3 Conformance . 17
4.2.2.5 Receiver non-linearity . 17
4.2.2.5.1 Definition. 17
4.2.2.5.2 Limits . 18
4.2.2.5.3 Conformance . 18
5 Testing for compliance with technical requirements . 18
5.1 Environmental conditions for testing . 18
5.1.1 General requirements . 18
5.1.2 Test conditions . 18
ETSI
4 ETSI EN 303 364-1-1 V1.1.1 (2025-06)
5.1.2.1 Thermal Balance . 18
5.1.2.2 Environmental Test Conditions . 18
5.1.2.2.1 Temperature and humidity. 18
5.1.2.2.2 Power supply (AC only) . 19
5.2 Radio test suites . 19
5.2.1 Transmitter test specification . 19
5.2.1.1 Occupied bandwidth. 19
5.2.1.2 Transmitter Peak Power . 19
5.2.1.3 Measured B bandwidth . 20
-40
5.2.1.4 Unwanted emissions. 20
5.2.1.4.1 Out-of-band Emissions . 20
5.2.1.4.2 Emissions in the spurious domain . 21
5.2.1.4.3 Stand-by mode emissions . 21
5.2.1.5 Pulse Length . 21
5.2.1.6 Pulse Rise Time . 22
5.2.1.7 Pulse Fall Time . 22
5.2.2 Receiver test specification . 23
5.2.2.1 System Noise Figure . 23
5.2.2.2 Receiver Compression Level . 23
5.2.2.2.1 General setup . 23
5.2.2.2.2 Test Signal . 23
5.2.2.2.3 Measurement Procedure . 23
5.2.2.3 Receiver selectivity . 24
5.2.2.3.1 General setup . 24
5.2.2.3.2 Disturbing Test Signals . 24
5.2.2.3.3 Measurement Procedure . 24
5.2.2.4 Receiver non-linearity . 24
Annex A (informative): Relationship between the present document and the essential
requirements of Directive 2014/53/EU . 26
Annex B (normative): Calculation of the B bandw idth . 28
-40
Annex C (normative): Occupied bandwidth and B measurement set-up . 30
-40
Annex D (normative): Transmitter Peak Power measurement set-up . 31
Annex E (normative): Out-of-Band Emissions measurement set-up . 32
Annex F (normative): Spurious Emissions and Stand-By Mode emissions measurement set-
up . 33
Annex G (normative): Pulse Length, Pulse Rise Time and Pulse Fall time measurement set-
up . 35
Annex H (normative): System Noise Figure measurement set-up . 36
Annex I (normative): Compression level measurement set-up . 38
Annex J (normative): Selectivity measurement set-up . 39
Annex K (normative): Receiver non-linearity measurement set-up . 40
Annex L (informative): Maximum Measurement Uncertainty . 41
Annex M (informative): Checklist . 42
Annex N (informative): Bibliography . 44
History . 45

ETSI
5 ETSI EN 303 364-1-1 V1.1.1 (2025-06)
Intellectual Property Rights
Essential patents
IPRs essential or potentially essential to normative deliverables may have been declared to ETSI. The declarations
pertaining to these essential IPRs, if any, are publicly available for ETSI members and non-members, and can be
found in ETSI SR 000 314: "Intellectual Property Rights (IPRs); Essential, or potentially Essential, IPRs notified to
ETSI in respect of ETSI standards", which is available from the ETSI Secretariat. Latest updates are available on the
ETSI IPR online database.
Pursuant to the ETSI Directives including the ETSI IPR Policy, no investigation regarding the essentiality of IPRs,
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Foreword
This Harmonised European Standard (EN) has been produced by ETSI Technical Committee Electromagnetic
compatibility and Radio spectrum Matters (ERM).
The present document has been prepared under the Commission's standardisation request C(2015) 5376 final [i.2] to
provide one voluntary means of conforming to the essential requirements of Directive 2014/53/EU on the harmonisation
of the laws of the Member States relating to the making available on the market of radio equipment and repealing
Directive 1999/5/EC [i.1].
Once the present document is cited in the Official Journal of the European Union under that Directive, compliance with
the normative clauses of the present document given in Table A.1 confers, within the limits of the scope of the present
document, a presumption of conformity with the corresponding essential requirements of that Directive, and associated
EFTA regulations.
The present document is part 1, sub-part 1, of a multi-part deliverable covering Primary Surveillance Radar (PSR), as
identified below:
Part 1: "Air Traffic Control (ATC) PSR sensors operating in the frequency band 1 215 MHz to 1 400 MHz
(L band)";
Sub-part 1: "radar systems using reflector antennas";
Sub-part 2: "radar systems using phased array antennas".
Part 2: "Air Traffic Control (ATC) PSR sensors operating in the frequency band 2 700 MHz to 3 100 MHz
(S band)";
Part 3: "Air Traffic Control (ATC) PSR sensors operating in the frequency band 8 500 MHz to 10 000 MHz
(X band)".
ETSI
6 ETSI EN 303 364-1-1 V1.1.1 (2025-06)
National transposition dates
Date of adoption of this EN: 10 June 2025
Date of latest announcement of this EN (doa): 30 September 2025
Date of latest publication of new National Standard
or endorsement of this EN (dop/e): 31 March 2026
Date of withdrawal of any conflicting National Standard (dow): 31 March 2027

Modal verbs terminology
In the present document "shall", "shall not", "should", "should not", "may", "need not", "will", "will not", "can" and
"cannot" are to be interpreted as described in clause 3.2 of the ETSI Drafting Rules (Verbal forms for the expression of
provisions).
"must" and "must not" are NOT allowed in ETSI deliverables except when used in direct citation.

ETSI
7 ETSI EN 303 364-1-1 V1.1.1 (2025-06)
1 Scope
The present document specifies technical characteristics and methods of measurements for ground based monostatic
ATC solid state primary surveillance radars that are intended to work with a waveguide-based rotating passive antenna
and have the following characteristics:
• operation in the 1 215 MHz to 1 400 MHz frequency range;
• transmitter output peak power up to 100 kW;
• the transceiver output uses an RF circulator;
• a piece of waveguide of at least 66 cm is integral to the transceiver.
NOTE 1: Phased array ATC primary surveillance radars are not covered by the present document.
NOTE 2: 66 cm equals 2 times the cut-off wavelength of a WR650/WG6/R14 waveguide which is typically used in
the 1 215 MHz to 1 400 MHz frequency range.
NOTE 3: The relationship between the present document and essential requirements of article 3.2 of
Directive 2014/53/EU [i.1] is given in Annex A.
2 References
2.1 Normative 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 version of the
referenced document (including any amendments) applies.
Referenced documents which are not found to be publicly available in the expected location might be found in the
ETSI docbox.
NOTE: While any hyperlinks included in this clause were valid at the time of publication, ETSI cannot guarantee
their long term validity.
The following referenced documents are necessary for the application of the present document.
[1] ETSI EN 300 019-1-3 (V2.4.1) (04-2014): "Environmental Engineering (EE); Environmental
conditions and environmental tests for telecommunications equipment; Part 1-3: Classification of
environmental conditions; Stationary use at weather protected locations".
2.2 Informative 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 version of the
referenced document (including any amendments) applies.
NOTE: While any hyperlinks included in this clause were valid at the time of publication, ETSI cannot guarantee
their long-term validity.
The following referenced documents may be useful in implementing an ETSI deliverable or add to the reader's
understanding, but are not required for conformance to the present document.
[i.1] Directive 2014/53/EU of the European Parliament and of the Council of 16 April 2014 on the
harmonisation of the laws of the Member States relating to the making available on the market of
radio equipment and repealing Directive 1999/5/EC.
ETSI
8 ETSI EN 303 364-1-1 V1.1.1 (2025-06)
[i.2] Commission Implementing Decision C (2015) 5376 final of 4.8.2015 on a standardisation request
to the European Committee for Electrotechnical Standardisation and to the European
Telecommunications Standards Institute as regards radio equipment in support of Directive
2014/53/EU of the European Parliament and of the Council.
[i.3] ITU Radio Regulations (2024).
[i.4] Recommendation ITU-R SM.1541-7 (09/2024): "Unwanted emissions in the out-of-band domain".
[i.5] ETSI EG 203 336 (V1.2.1): "Guide for the selection of technical parameters for the production of
Harmonised Standards covering article 3.1(b) and article 3.2 of Directive 2014/53/EU".
[i.6] IEC 60153-2 (2016): "Hollow metallic waveguides - Part 2: Relevant specifications for ordinary
rectangular waveguides".
[i.7] Recommendation ITU-R SM.331-4 (07/78): "Noise and sensitivity of receivers".
[i.8] Recommendation ITU-R SM.332-4 (07/78): "Selectivity of receivers".
[i.9] ECC Recommendation (02)05 (October 2012): "Unwanted emissions".
[i.10] ERC Recommendation 74-01 (May 2022): "Unwanted emissions in the spurious domain".
[i.11] Recommendation ITU-R M.1177-4 (04/2011): "Techniques for measurement of unwanted
emissions of radar systems".
3 Definition of terms, symbols and abbreviations
3.1 Terms
For the purposes of the present document, the following terms apply:
active state: state which produces the authorized emission
allocated frequency band: frequency range that regionally or nationally is allocated to one or more radio services on a
primary or secondary basis
chirp bandwidth: total frequency shift during the pulse generation of an FM/chirped radar
EXAMPLE: If the Frequency Modulation is from 1 250 MHz to 1 280 MHz, the chirp bandwidth is 30 MHz.
declared frequency band: band or bands within which the equipment under test is declared to operate
NOTE: The declared frequency band for a given region or country is always contained within the allocated
frequency band.
dummy load: device connected to a waveguide or coaxial cable and matched to their impedance (typically 50 Ω) to
absorb the RF energy propagating inside
Equipment Under Test (EUT): device that is the subject of the specific test investigation being described
idle/stand-by state: state where the transmitter is available for traffic, but is not in the active state
matched filter: receiver filter that matches the transmitted radar waveform, i.e. this is the filter that maximizes the
signal-to-noise ratio of the received pulse
necessary bandwidth: width of the frequency band which is just sufficient to ensure the transmission of information at
the rate and with the quality required under specified conditions for a given class of emission
NOTE 1: This definition is taken from ITU Radio Regulation [i.3].
NOTE 2: For Primary radars the necessary bandwidth B is considered to be B (20 dB bandwidth) as defined in
N -20
Recommendation ITU-R SM.1541-7 [i.4].
ETSI
9 ETSI EN 303 364-1-1 V1.1.1 (2025-06)
occupied bandwidth: width of a frequency band such that, below the lower and above the upper frequency limits, the
mean powers emitted are each equal to a specified percentage β/2 of the total mean power of a given emission
NOTE 1: Unless otherwise specified in an ITU-R Recommendation for the appropriate class of emission, the value
of β/2 should be taken as 0,5 %.
NOTE 2: This definition is taken from ITU Radio Regulations [i.3], chapter I, 1.153.
operating frequencies: frequencies on which the radar is tuned to operate
operating mode: predefined configuration for a given service accessible to the operator of the radar system
NOTE 1: Several operating modes may be available.
NOTE 2: Changing operating mode might affect the radio characteristics of the radar system.
Peak Envelope Power (PEP): average power supplied to the antenna transmission line by a transmitter during one
radio frequency cycle at the crest of the modulation envelope taken under normal operating conditions
NOTE: This definition is taken from ITU Radio Regulations [i.3], chapter I, 1.157.
product configuration: hardware variant of the same typology of system under test (e.g. different power outputs,
magnetrons)
pulse fall time: time taken for the trailing edge of the pulse to decrease from 90 % to 10 % of the maximum amplitude
(voltage)
pulse length: time between the 50 % amplitude (voltage) points
pulse rise time: time taken for the leading edge of the pulse to increase from 10 % to 90 % of the maximum amplitude
(voltage)
radar equipment: equipment and its associated primary navigational display intended for the navigation of aircraft in
airways
receiver output: output of the digital matched filter function
system coupler: directional waveguide coupler with forward and reverse port or only a forward port
NOTE: The system coupler is inserted in the waveguide run between the circulator and the antenna but not
directly located behind the antenna. Usually it is located very close behind the circulator.
unwanted emissions: consist of spurious emissions and out-of-band emissions
NOTE: This definition is taken from ITU Radio Regulation [i.3].
3.2 Symbols
For the purposes of the present document, the following symbols apply:
B -20 dB bandwidth below PEP of the spectrum of the transmitted waveform
-20
B -40 dB bandwidth below PEP of the spectrum of the transmitted waveform
-40
B Chirp bandwidth
C
B Measurement bandwidth
m
B Necessary bandwidth
N
B Reference bandwidth
ref
B 3 dB resolution bandwidth of transceiver
res
dB/dec dB per decade
dBm Power ratio expressed in decibels (dB) with reference to 1 milliwatt
dBpp Power ratio expressed in decibels (dB) with reference to peak power
f Operating Frequency
o
f Cut-off Frequency
co
f Intermediate Frequency
IF
f Receiver operating Frequency
RF
f Image Frequency
image
ETSI
10 ETSI EN 303 364-1-1 V1.1.1 (2025-06)
k Boltzmann's constant
f Local Oscillator Frequency
LO
Spectrum Peak Power
Pmeas
Pt Pulse power of transmission
RF Radio Frequency
S/N Signal-to-Noise ratio
t Pulse length
T Pulse length (of individual chirp waveforms) in seconds
C
tr Pulse rise time
tf Pulse fall time
T Temperature in Kelvin
β/2 Percentage of the total mean power of a given emission
λ Wavelength
3.3 Abbreviations
For the purposes of the present document, the following abbreviations apply:
AC Alternating Current
ATC Air Traffic Control
COF Cut-Off Frequency
CW Continuous Wave
DC Direct Coupling
EIA Electronic Industries Alliance
EN European Norm
ENR Excess Noise Ratio
EUT Equipment Under Test
FM Frequency Modulation
Hz Hertz
IEC International Electrotechnical Commission
IF Intermediate Frequency
IMD InterModulation Distortion
ITU-R International Telecommunications Union - Radiocommunications
kHz kiloHertz
kW kiloWatt
NA Not Available
NF Noise Factor
OoB Out-of-Band
PEP Peak Envelope Power
ppm parts per million
PSR Primary Surveillance Radar
RCL Receiver Compression level
RF Radio Frequency
SM Spectrum Management
STD Standard Deviation
SWT Sweep Time
ETSI
11 ETSI EN 303 364-1-1 V1.1.1 (2025-06)
4 Technical requirements specifications
4.1 Environmental profile
The technical requirements of the present document apply under the environmental profile for operation of the
equipment, which shall be in accordance with its intended use, but as a minimum, shall be that specified in the test
conditions contained in the present document. The equipment shall comply with all the technical requirements of the
present document at all times when operating within the boundary limits of the operational environmental profile
defined by its intended use.
4.2 Conformance Requirements
4.2.1 Transmitter requirements
4.2.1.1 Occupied bandwidth
4.2.1.1.1 Definition
Occupied bandwidth is the width of a frequency band such that, below the lower and above the upper frequency limits,
the mean powers emitted are each equal to a specified percentage β/2 of the total mean power of a given emission as
defined in ITU Radio Regulations [i.3], chapter I, 1.153.
4.2.1.1.2 Limits
The occupied bandwidth with β/2 = 0,5 % shall be maintained wholly within the declared frequency band.
NOTE: The value of β/2 = 0,5 % is taken from chapter I, 1.153 of the ITU Radio Regulations [i.3].
4.2.1.1.3 Conformance
The conformance tests are specified in clause 5.2.1.1.
4.2.1.2 Transmitter Peak Power
4.2.1.2.1 Definition
The transmitter peak power of a pulse radar is the peak value (PEP) of the transmitter pulse power during the
transmission pulse measured at the antenna flange (output port of the transmitter).
4.2.1.2.2 Limits
The transmitter peak power shall not exceed 100 kW (i.e. 80 dBm).
4.2.1.2.3 Conformance
The conformance tests are specified in clause 5.2.1.2.
4.2.1.3 Measured B-40 bandwidth
4.2.1.3.1 Definition
The measured -40 dB bandwidth (B ) is the measured bandwidth of the emissions 40 dB below the measured PEP.
-40
NOTE: Occupied bandwidth will be smaller than B for such equipment.
-40
ETSI
12 ETSI EN 303 364-1-1 V1.1.1 (2025-06)
4.2.1.3.2 Limits
The measured B bandwidth shall always be contained within the declared frequency band.
-40
4.2.1.3.3 Conformance
The conformance tests are specified in clause 5.2.1.3.
4.2.1.4 Unwanted emissions
4.2.1.4.1 General requirements
The Out-of-Band emission limits and the spurious emission limits shall be based on the calculated B bandwidth as
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defined in Annex B. The OoB and Spurious domain boundaries and limits are defined in clause 4.2.1.4.2.2.
B
-40 dB
Spurious domain OoB domain OoB domain

Figure 1: Definition of OoB and spurious emission domains (case of a single operating frequency)
(Not to scale)
4.2.1.4.2 Out-of-band Emissions
4.2.1.4.2.1 Definition
Out-of-Band (OoB) emissions refer to emissions in the region between the calculated B and the spurious domain.
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NOTE: The calculated B is defined in Annex B.
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4.2.1.4.2.2 Limits
For single frequency radars, the limits of emissions in the OoB domain frequency boundaries defined in Table 2, shall
be as specified in Table 1.
ETSI
40 dB
13 ETSI EN 303 364-1-1 V1.1.1 (2025-06)
Table 1: Limits for emissions in the OoB domain for single frequency radars
Frequency offset Δ Limit Slope
relative to B-40 dBpp (unless otherwise stated) dB/decade
0,5 ≤ Δ ≤ 5 -40 to -80 -40
5 < Δ ≤ 10,8 -80 to -100 / -30 dBm (see note 1) -60
NOTE 1: From -80 to -100 or -30 dBm whichever is less stringent).
NOTE 2: Frequency offset is a multiplicative factor of B-40 value.
NOTE 3: These limits are specified in ECC Recommendation (02)05 [i.9],
Annex 2, Table 3.
NOTE 4: B is calculated using the formulae in Annex B.
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Table 2: Out-of-Band emissions frequency boundaries for single frequency radars
Lower OoB measurement limit Upper OoB measurement limit
Maximum value between Operating frequency + 10,8 x B
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(Operating frequency - 10,8 x B )
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and fco x 0,7 MHz (see note 1)

NOTE 1: This value corresponds to the cut-off frequency of the equipment embedded piece of
waveguide times 0,7 as described in ERC Recommendation 74-01 [i.10].
NOTE 2: B is calculated using the formulae in Annex B.
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NOTE 3: Boundaries are specified in Annex 2 of ECC Recommendation (02)05 [i.9].

For multi frequency radars, the limits of emissions in the OoB domain frequency boundaries, defined in Table 4, shall
be as specified in Table 3.
Table 3: Limits for emissions in the OoB domain for multi frequency radars
Frequency offset Δ Limit Slope
relative to B dBpp dB/decade
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0,5 ≤ Δ ≤ 1,6 -40 to (-43 - 10 x log(PEP) / -60 dB (see note 1)) -40
NOTE 1: From -40 to -43 - 10 x log(PEP) or -60 dBpp whichever is less stringent.
NOTE 2: Frequency offset is a multiplicative factor of B-40 value.
NOTE 3: PEP unit is Watt.
NOTE 4: These limits are specified in ECC Recommendation (02)05 [i.9], Annex 2, Table 3.
NOTE 5: B is calculated using the formulae in Annex B.
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Table 4: Out-of-Band emissions frequency boundaries for multi frequency radars
Lower OoB measurement limit Upper OoB measurement limit
Maximum value between Operating frequency + 1,6 x B
-40
)
(Operating frequency - 1,6 x B
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and fco x 0,7 MHz (see note 1)
NOTE 1: This value corresponds to the cut-off frequency of the equipment embedded piece of
waveguide times 0,7 as described in ERC Recommendation 74-01 [i.10].
NOTE 2: B is calculated using the formulae in Annex B.
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NOTE 3: Boundaries are specified in Annex 2 of ECC Recommendation (02)05 [i.9].

For radars using multiple pulse waveforms, the emission mask shall be calculated for each individual pulse and the
widest mask shall be considered.
4.2.1.4.2.3 Conformance
The conformance tests are specified in clause 5.2.1.4.1.
ETSI
14 ETSI EN 303 364-1-1 V1.1.1 (2025-06)
4.2.1.4.3 Emissions in the spurious domain
4.2.1.4.3.1 Definition
Spurious emissions are unwanted emissions in the spurious domain. They include:
• harmonic emissions (i.e. whole multiples of the operating frequency);
• parasitic emissions;
• emissions from intermodulation products (e.g. between oscillator and operating frequency, or between
oscillator and harmonics);
• emissions from frequency conversion products.
For transmitters in active state, the spurious domain is all frequencies outside the OoB domain.
4.2.1.4.3.2 Limits
The spurious emissions limits in the frequency bands defined in Table 6 shall be as specified in Table 5.
Table 5: Limits for emissions in the spurious domain
Radar type Limits (see note 1)
Single frequency 100 dB or -30 dBm whichever is less stringent
Multi frequency 43 + 10 x log (PEP) or 60 dB whichever is less stringent
NOTE 1: Absolute levels (in dBm) in the reference bandwidth or attenuation (dB) below the power
(PEP) supplied to the antenna port.
NOTE 2: These limits are specified in ERC Recommendation 74-01 [i.10], Annex 5.

Table 6: measurement bands for the emissions in the spurious domain
Lower band measurement limits Upper band measurement limits
From fco x 0,7 MHz (see note 1) From the upper OoB boundary
th
to the lower OoB boundary To 5 harmonic of the operating frequency + Δ
(see note 2)
NOTE 1: The lower frequency corresponds to the COF of the equipment embedded piece of waveguide times
0,7 as described in ERC Recommendation 74-01 [i.10]. Measurement below this frequency are not
required due to the fact that power transfer below this frequency is negligible and therefore
measurements will not provide sound and repeatable results.
th
NOTE 2: The upper band measurement limit corresponds to the 5 harmonic of the highest operating
frequency, as defined in ERC Recommendation 74-01 [i.10], Table 1, plus a margin Δ corresponding
to the maximum Occupied bandwidth d defined in clause 4.2.1.1.2 and calculated according to the
�
following formula: Δ = 5 ×�� ×� � �, where fo is the highest operating frequency. For example
�
-6
with fo = 1 400 MHz, the margin Δ (in MHz) will be: 5 x 1 400 x 500 x 10 = 3,5 MHz and therefore
the measurement limit will extend up to 7 003,5 MHz.
NOTE 3: OoB frequency boundaries are specified in Table 2 (for single frequency radars) and Table 4 (for
multi frequency radars).
4.2.1.4.3.3 Conformance
The conformance tests are specified in clause 5.2.1.4.2.
4.2.1.4.4 Stand-by mode emissions
4.2.1.4.4.1 Definition
Stand-by mode emissions are residual emissions at the transceiver output when the transmitter is in stand-by mode. In
this mode, the transmitter is available for operation, but is not in the active state.
ETSI
15 ETSI EN 303 364-1-1 V1.1.1 (2025-06)
4.2.1.4.4.2 Limits
The stand-by mode emissions shall not exceed the limits specified in Table 7 (f is the measurement frequency).
NOTE: These limits are specified in Table 15 of Annex 5 of ERC Recommendation 74-01 [i.10].
Table 7: Stand-by mode emission limits
Frequency Range Limits
fco x 0,7 MHz (see note 1) ≤ f ≤ 1 GHz -57 dBm
th
1 GHz < f ≤ 5 harmonic of the operating frequency fo + Δ (see note 2) -47 dBm
NOTE 1: The lower frequency corresponds to the COF of the equipment embedded piece of waveguide
times 0,7 as described in ERC Recommendation 74-01 [i.10].
th
NOTE 2: The upper band measurement limit corresponds to the 5 harmonic of the highest of the
operating frequencies as defined in ERC Recommendation 74-01 [i.10], Table 1 plus a margin Δ
corresponding to the maximum Occupied bandwidth d defined in clause 4.2.1.1.2 and calculated
�
according to the following formula: Δ = 5 ×�� ×� �. For example with fo = 1 400 MHz, the
�
�
-6
margin Δ (in MHz) will be: 5 x 1 400 x 500 x 10 = 3,5 MHz and therefore the measurement limit
will extend up to 7 003,5 MHz.

4.2.1.4.4.3 Conformance
The conformance tests are specified in clause 5.2.1.4.3.
4.2.2 Receiver requirements
4.2.2.1 General requirement
The L-band ATC radars use an RF receiver inside the transceiver function and may use additional RF receivers
connected to the radar antenna receiving beams patterns. The receiver requirements shall be tested for all the receivers
of the radar.
4.2.2.2 System Noise Figure
4.2.2.2.1 Definition
The Noise Figure is the noise factor as defined below expressed in dB.
The noise factor is the
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