ČSN ETSI EN 303 135 V2.1.1

The present document applies to X-band radar sensors intended for use in Vessel Traffic Services (VTS), Coastal Surveillance (CS) or Harbour Radar Systems with the following characteristics: " Utilizing modulated or unmodulated pulses. " Transmitter Peak Envelope Power up to 100 kW. " The transceiver-antenna connection is using a hollow metallic rectangular waveguide. " The antenna is rotating, waveguide- based and passive. " At the transceiver output an RF-circulator is used. NOTE 1: Since transceiver and antenna are hollow metallic rectangular waveguide based, the frequency range for measurements that needs to be addressed covers 6,56 GHz to 26 GHz. The lower limit of this frequency range is obtained as cut-off frequency of the combination of WR112/R84 taper section and a WR90/R100 Waveguide as defined by IEC 60153-2 [i.2]. The upper limit corresponds to the upper limit stated in ERC/Recommendation 74 01 [i.4]. Other types of waveguide may be used by the same principles to obtain complete measurement coverage of the frequency range of the output flange of the equipment under test. NOTE 2: Since at the transceiver output an RF circulator is used, it is assumed that the transceiver char-acteristics remain independent from the antenna. NOTE 3: According to article 5 of the ITU Radio Regulations [i.5] there are a number of bands between 8,5 GHz and 10 GHz that are allocated to Radiolocation service. There are national deviations to the detailed band usages, but the basic spectrum usage regulation is the same. The present document contains requirements to demonstrate that "...radio equipment shall be so constructed that it both effectively uses and supports the efficient use of radio spectrum in order to avoid harmful interference" [i.1]. In addition to the present document, other ENs that specify technical requirements in respect of essential re-quirements under other parts of article 3 of the Radio Equipment Directive [i.1] may apply to equipment within the scope of the present document.