The CCIR considering : a) the Final Acts of the European VHF/UHF Broadcasting Conference, Stockholm, 1961, and the special agreement relating to the use of the band 582-606 MHz by the radionavigation service, Brussels, 1962; b) the assumption, which remains to be fully confirmed, that the results of tests carried out with monochrome television signals are also applicable to colour television; c) that protection ratios should be such that they are satisfied for 99% of the time; d) that values of protection ratios refer to the conditions at the input to the television receiver; e) that the level of the radionavigation signal is expressed as the power at peak of the modulation envelope; f) that the level of the radionavigation signal is expressed as the power at peak-pulse level.