For general exploringobjects requirement, narrow pulse signal with tens millimicro second to millimicrosecond has the frequency spectrum from DC to thousands MHz.
按

目标探测的一般需要,通常采用纳
到十纳
量级的电磁探测窄脉冲,信号
谱具有从直

直到千兆赫兹的宽带。
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One The pioneer plaque gives a hint in the form of a basic diagram of a hydrogen atom the magnetic polarity of which flips at regular intervals with a frequency of 1,420 megahertz, Since hydrogen is the most abundant element in the universe.
先驱者牌匾通过一个基本的氢原子示意图给出了提示, 该氢原子的磁极
1420兆赫兹的频率定期
。
于氢是宇宙中最丰富的元素。