Recommendation itu-r sm. 1538-1 Technical and operating parameters and spectrum requirements for short range radiocommunication devices

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2 RF-level gauges

The operating parameters and spectrum requirements of RF level gauges which are in operation today throughout the world are indicated in Tables 8 to 10.

2.1 Pulsed systems

Pulsed systems are low cost and have low power consumption. Today they operate at 5.8 GHz which is the centre frequency of the ISM allocation. However, manufacturers are expecting products in the 10 GHz, 25 GHz, and 76 GHz ranges. The exact frequency of operation will depend on a particular product. Typical characteristics are in Table 8.





0.1  frequency

Tx power (peak) (dBm)

0 to 10

Pulse width

200 ps to 3 ns

Duty cycle (%)

0.1 to 1

Pulse repetition frequency (MHz)

0.5 to 4

Pulse RF systems radiate a pulse with or without a carrier through air.

2.2 FMCW systems

This type of system is well developed. The FMCW is robust and uses advanced signal processing which provides good reliability. The characteristics of FMCW systems are in Table 9.




Frequency (GHz)

10, 25

Bandwidth (GHz)

0.6, 2

Tx power (dBm)

0 to 10

2.3 RF level gauge operating parameters and spectrum requirements


Frequency band (GHz)



Duty cycle


10 mW


0.1 to 1


100 mW


0.1 to 1


500 mW


0.1 to 1


2 W


0.1 to 1


8 W


0.1 to 1

NOTE 1 – Operation of these gauges may not be possible and/or may require certification in certain portions of these frequency ranges in accordance with existing national and international regulations.

Appendix 1
to Annex 2

(Region 1; CEPT Countries)

Technical and operating parameters and spectrum
requirements for SRDs


1 CEPT/ERC Recommendation 70-03

2 Applications

3 Technical requirements

3.1 ETSI Standards

3.2 EMC and safety

3.3 National type approval specifications

4 Spectrum requirements

4.1 Frequency bands

4.2 Radiated power or field strength

4.3 Transmitter antenna source

4.4 Channel spacing

4.5 Duty cycle categories

5 Administrative requirements

5.1 Licensing requirements

5.2 Conformity assessment, marking requirements and free circulation

6 Operating parameters

7 The R&TTE Directive

8 Update of Recommendation CEPT/ERC/REC 70-03

1 Recommendation CEPT/ERC/REC 70-03

Recommendation CEPT/ERC/REC 70-03 “Relating to the use of short-range devices (SRD)”, sets out the general position on common spectrum allocations for SRDs for countries within the CEPT. It is also intended that it can be used as a reference document by the CEPT member countries when preparing their national regulations in order to keep in line with the provisions of the R&TTE Directive.

The Recommendation describes the spectrum management requirements for SRDs relating to allocated frequency bands, maximum power levels, equipment antenna, channel spacing, duty cycle, licensing and free circulation.

In addition for CEPT countries which have not implemented the R&TTE Directive it also sets out the conformity assessment and marking requirements. However, for CEPT countries that have implemented the R&TTE Directive, Article 12 (CE-marking) which states that “any other marking may be affixed to the equipment provided that the visibility and legibility of the CE-marking is not hereby reduced” and Article 7.2 which states that “Member States may restrict the putting into service of radio equipment only for reasons related to the effective and appropriate use of the radio spectrum, avoidance of harmful interference or matters relating to public health” apply.

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