International comparison GT-RF 75-A 14: attenuation (6,10,20,40 dB) at 300 MHz in 75 Ω coaxial line

This is the first comparison between national standard devices in which attenuation values up to 40 dB at a frequency of 300 MHz in the 75 Ω coaxial line have been compared. Five national laboratories of metrology, from the UK, Finland, Canada, The Netherlands, and the Federal Republic of Germany (pilot laboratory), participated. The transfer standards were two fixed attenuators with an attenuation of 6 and 20 dB, and two switchable attenuators with 10 and 40 dB steps. The maximum difference between any two results for the more stable fixed attenuators is 0.009 dB at an attenuation of 6 dB and 0.016 dB at 20 dB attenuation. For three of the five participants, the deviation between mean values was not larger than 0.0004 dB for an attenuation of 6 dB and not larger than 0.0013 dB for one of 20 dB