SSH EN 301 390 V1.1.1:2000

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

Scope

The present document deals with spurious emissions at antenna port of Digital Fixed Radio Systems as defined by
Radio Regulation Article 1 [15], ITU-R Recommendation SM.329-7 [1], ITU-R Recommendation F.1191-1 [2] and
CEPT/ERC Recommendation 74-01 [3].
Moreover it covers immunity characteristics at receiver's antenna port.
Scope of the present document is to define specific limits at antenna port of spurious emissions and receiver immunity
for suitable inter-working of Digital Fixed Radio Systems (i.e. Point-to-Point and Point-to-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 required to fulfil the
EEC directive 89/336 [14] on EMC.
The present document complements CEPT/ERC Recommendation 74-01 [3] 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 N°139 [15]) is aged and give concept and
applicability which do not clearly fit to digital systems;
- ITU-R Recommendation SM.329-7 [1] includes emissions with digital modulation but allows options for the
definition of the frequency boundary between out of band and spurious emissions and two different Category of
level limits applicable to the Fixed Service;
- ITU-R Recommendation F.1191-1 [2] and CEPT/ERC Recommendation 74-01 [3] define the application of
Radio Regulations concepts of Out of band, Unwanted and Spurious emissions to fixed Digital Radio Systems,
clarify the applicability for the boundary between Out of band and Spurious emissions but maintain the same
possible limit options provided by ITU-R Recommendation SM.329-7 [1];
- STC-RES09 has produced many ETSs covering EMC of radio equipment for mobile applications, which include
emissions (or radiation) and immunity at antenna port; STC-RES09 also produced EN 301 489-1 [10] and
EN 301 489-4 [11] covering EMC for fixed Radio links, which exclude, by mutual agreement with WG-TM4,
spurious emissions and immunity at antenna port, which have to be defined by the product standards in order to
cover all the technical parameters for conformance to the EMC Directive 89/336;
- 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 of 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
(informative annex B gives also information in this field);
- it is advisable that Fixed Radio Systems 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 Fixed Radio Systems receivers immunity at antenna port may be
considered the application of a CW interference.
ETSI
6 ETSI EN 301 390 V1.1.1 (2000-12)
The present document will cover the limits of spurious emissions for already published ETSI deliverables for Fixed
Radio Systems, for the time needed to produce suitable revision, in the following cases:
• the ETSI deliverable does not cover the external spurious emissions and/or receiver immunity items;
• the ETSI deliverable contains less demanding limits;
• the ETSI deliverable contains preliminary limits and/or undefined reference bandwidth.
Some ETSI deliverables for Fixed Radio Systems, 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 informative annex B, spurious emissions are analysed from the point of view of a
suitable test method for conformance testing.