SSH EN 301 390 V1.2.1:2003

Sisteme Radio Fikse; Sistemet pikë-pikë dhe të Shumëfishta; Emetimet e padëshiruar dhe kufijt e imunitetit të marrësit në portin e pajisjeve/antenë të Sistemeve Radio Dixhitale të Fiksuar

Fixed Radio Systems; Point-to-point and Multipoint Systems; Spurious emissions and receiver immunity limits at equipment/antenna port of Digital Fixed Radio Systems

Scope

The term Spurious emissions is used for simplicity elsewhere in the present document but with the more broader
meaning of "unwanted emissions in the spurious domain" introduced by ITU-R Recommendation SM.329-10 [1] for
clarifying the Radio Regulation definitions and the application of recommended limits for all unwanted emissions; it
also recommends that spurious emissions limits apply to all unwanted emissions falling in the spurious domain.
Therefore the present document deals with limits for unwanted emissions in the spurious domain at antenna port of
Digital Fixed Radio Systems (DFRS) as defined by ITU-R Recommendation SM.329-10 [1] and CEPT/ERC
Recommendation 74-01 [4] and CEPT/ECC Recommendation 02-05 [5].
Moreover it covers immunity characteristics at receiver's antenna port.
Scope of the present document is to define specific limits at antenna port for spurious emissions and receiver immunity
for suitable inter-working of Digital Fixed Radio Systems (i.e. Point-to-Point and Multipoint systems) in the same or in
different frequency band whenever allocated to Fixed Service in the range 9 kHz to 300 GHz.
However systems with fundamental emission below 30 MHz are not considered relevant for Digital Fixed Radio
Systems and are outside the scope of the present document.
Spurious emissions levels and immunity performance at antenna port are also relevant to essential requirements under
article 3.2 of Directive 1999/5/EC [15] on Radio equipment and Telecommunication Terminals equipment (R&TTE).
The present document complements CEPT/ERC Recommendation 74-01 [4] which gives Spurious Emissions limits
with particular regards to "inter Services" operations, while WG TM4 assumed that in some case more protection is
required for compatibility among fixed radio systems deployed in the same geographical area.
Additional considerations and background for producing the present document are:
- Radio Regulations definition of spurious emissions (RR Article 1-145 [16]) is aged and give concept and
applicability which do not clearly fit to digital systems; however ITU-R Recommendation SM.329-10 [1]
introduced a more useful definition of "unwanted emissions in the spurious domain", which should eventually
be introduced also into Radio Regulations;
- ITU-R Recommendation SM.329-10 [1] considers emissions from any system, including digital modulation
and allows options for the definition of the frequency boundary between out-of-band domain and spurious
emissions domain. It recommends different category of level limits applicable to the Fixed Service;
- ITU-R Recommendation SM.1539-1 [2] describes the application of the boundary concept between
out-of-band and spurious emission domains;
- ITU-R Recommendation F.1191-2 [3] define the application of Radio Regulations and SM set of ITU-R
Recommendations concepts of out-of-band, unwanted and spurious emissions to DFRS, clarify the
applicability for the boundary between out-of-band and Spurious emissions domains but maintain the same
possible limit options provided by ITU-R Recommendation SM.329-10 [1];
- CEPT/ERC Recommendation 74-01 [4], endorses only the more stringent Category B limits of ITU-R
Recommendation SM.329-10 [1];
- after the coming into force of RTTE Directive [15] the emissions and immunity at antenna port fall under its
article 3.2 requirements for "effective use of spectrum" and "avoidance of harmful interference" and they are
no longer an EMC requirement;
- considering the large number of TM4 deliverables it is convenient to maintain a single EN covering these
parameters instead of replicating them on each single product standard, avoiding possible deviation from what
required by other CEPT and ITU-R normative;
- limits for spurious emissions shall be fixed in view of inter-working compatibility among various Fixed Radio
Systems in same or different band exploited in the same area;
- the measurement of the required limits should also be feasible in a suitable and cost effective conformance test
(annex B gives also information in this field);
ETSI
6 ETSI EN 301 390 V1.2.1 (2003-11)
- it is necessary that DFRS receivers provide a minimum level of immunity at antenna port towards possible
interference at any frequency band of practical interest;
- a suitable and easy to perform criterion for DFRS receivers' immunity at antenna port may be considered the
application of a CW interference.
Some ETSI deliverables for DFRS, sometimes, provide limits for both "external" and "internal" spurious emissions and
the latter are outside the scope of the present document. Moreover the limits for emissions given in the present
document do not prevent more stringent requirement given in those deliverables for intra-system purpose (i.e. local
Transmitter to Receiver interference usually referred as "internal").
In order to fix the suitable limits, in annex B, spurious emissions are analysed from the point of view of a suitable test
method for conformance testing.