The ITU Radiocommunication Assembly considering a)that Recommendation ITU-R P.368 presents ground-wave propagation curves for frequencies between 10 kHz and 30 MHz and that Recommendation ITU-R P.684 and Recommendation ITU-R P.1147 describe procedures for predicting sky-wave propagation at frequencies below about 150 kHz and at frequencies between about 150 and 1 700 kHz, respectively; b)that most of these and other available prediction methods are intended primarily for narrow-band or analogue systems.
ITU-R QUESTION 225-5/3-2007由国际电信联盟 IX-ITU 发布于 2007-01-01。
ITU-R QUESTION 225-5/3-2007 在中国标准分类中归属于: M60 广播、电视网综合。
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