planar epitaxial transistor encapsulated in a SOT223 surface mounted envelope and designed primarily for use in hand-held radio equipment in the 470 MHz communications band.-NPN silicon planar epitaxial transistor SOT223 surface mounte

认知无线电系统中能量检测部分，通过设置门限值，判断主用户出现与否-In the cognitive radio system, the energy detection part, by setting the threshold value, to judge whether the primary user appears or not.