ITU

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ITU-R Opinions

The ITU-R Opinions contain a proposal or a request destined for another organization (such as other Sectors of the ITU, international organizations, etc.) and not necessarily relating to a technical subject.

Op.2

Cooperation with the International Special Committee on Radio Interference  
Note - Suppressed (2011)

Op.14

Preferred radio-frequency channel arrangements for radio-relay links for international connections  
Note - Suppressed (2012)

Op.15

Broadcasting in the 26 MHz Band  
Note - Suppressed (2013)

Op.16

Organizations qualified to set standards on sound and television recording  
Note - Suppressed (2013)

Op.22

Routine ionospheric sounding  

Op.23

Observations needed to provide basic indices for ionospheric propagation  

Op.38

Exchange of monochrome and colour television programmes via satellites  
Note - Suppressed (2008)

Op.40

Subjective assessment of the quality of television pictures  
Note - Suppressed (2013)

Op.50

Coordination of the work of the ITU-R and the International Electrotechnical Commission (IEC) on measurements for the adjustment and maintenance of radio-relay systems  
Note - Suppressed (2012)

Op.51

Study of digital techniques by Radiocommunication Study Groups and Telecommunication Standardization Study Group 9  
Note - Suppressed (2012)

Op.56

Location of interface between Radiocommunication Study Group 4 and ITU-T responsibilities for digital network Recommendations  
Note - Suppressed (2008)

Op.68

Data bank of HF sky-wave signal intensity measurements  

Op.69

Field-stength measurements for frequencies below about 1.7 MHz  
Note - Suppressed

Op.71

Documentation of time transmissions  

Op.74

Systems for signal interface connection between sound-broadcasting receivers and associated equipment  
Note - Suppressed (2009)

Op.75

Systems for signal interface connection between television receivers and associated equipment  
Note - Suppressed (2009)

Op.83

Data broadcasting services  
Note - Suppressed (2011)

Op.85

Measurements of the characteristics of atmospheric radio noise  
Note - Suppressed

Op.90

Equipment interconnection in professional programme production installations  
Note - Suppressed (2013)

Op.91

World Atlas of Ground Conductivities  

Op.92

Support and harmonization of International Mobile Telecommunications (IMT) activities  

Op.93

Use of communications satellites for a service of two-way time and frequency transfer  
Note - Suppressed (2008)

Op.94

Time and frequency transfer using digital telecommunication networks  

Op.95

Cooperation and harmonization in the future activities of the Radiocommunication (ITU-R) and Telecommunication Standardization (ITU-T) Sectors  

Op.96

Future use of the global navigation satellite system (GNSS) for high-precision time transfer  

Op.97

Operational use of geostationary direct TV satellites for time transfer  
Note - Suppressed (2008)

Op.98

Spectrum requirements of meteorological aids in the frequency range from 400.15 to 406 MHz  

Op.99

Time scale based on pulsar timing  

Op.100

Compatibility considerations regarding the use of radio frequencies for purposes not considered within the Radio Regulations or other relevant ITU publications  

Op.101

Worldwide land cover databases  

Op.102

The use of UHDTV image systems described in Recommendation ITU-R BT.2020 for improved HDTV picture quality in programme production, distribution and broadcasting