For general exploringobjects requirement, narrow pulse signal with tens millimicro second to millimicrosecond has the frequency spectrum from DC to thousands MHz.
按照对地目标探测

需要,通常采用纳
到十纳
量级
电磁探测窄脉冲,信

具有从直流低
直到千兆赫兹
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
意图给出了提
, 该氢原子的磁极以1420

的频率定期翻转。由于氢是宇宙中最丰富的元素。