ETSI - EN 301 390
Fixed Radio Systems; Point-to-point and Multipoint Systems; Unwanted emissions in the spurious domain and receiver immunity limits at equipment/antenna port of Digital Fixed Radio Systems
|Publication Date:||1 August 2013|
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 Recommendation ITU-R SM.329  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 Recommendation ITU-R SM.329  and CEPT/ERC Recommendation 74-01  and ECC Recommendation (02)05 .
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 domain 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 domain levels and immunity performance at antenna port are also relevant to essential requirements under article 3.2 of Directive 1999/5/EC [i.12] on Radio equipment and Telecommunication Terminals equipment (R&TTE).
The present document complements CEPT/ERC Recommendation 74-01  which gives limits for Unwanted emissions in the Spurious domain 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:
- Recommendation ITU-R SM.329  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;
- Recommendation ITU-R SM.1539  describes the application of the boundary concept between out-of-band and spurious emission domains;
- Recommendation ITU-R F.1191  define the application of Radio Regulations [i.13] and SM set of Recommendation ITU-Rs 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 pos sible limit options provided by ITU-R Recommendation SM.329-10 ;
- CEPT/ERC Recommendation 74-01 , endorses only the more stringent Category B limits of Recommendation ITU-R SM.329-10 ;
- after the coming into force of RTTE Directive [i.12] 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;
- 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 unwanted emissions in the spurious domain are supposed to 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);
- 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 domain 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 domain emissions are analysed from the point of view of a suitable test method for conformance testing.