搜索 - 科创网

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内容：超外差接收机对天线的阻抗匹配要求较高，要求外接天线的阻抗必须是50欧姆的，否则对接收灵敏度有很大的影响，要尽可能减少天线根部到发射模块天线焊接处的引线长度，如果无法减小，可以用特性阻抗50欧姆的射频同轴电缆连接

内容：贴片封装单片机核心板空PCB 售价5元/片库存17 3寸 320x240 TFT液晶模组含触摸屏售价40元/片库存5 LCD1601 黄底黑字液晶模组售价6元/片库存20 50W 144MHz射频功放

内容：其一是由于在一个相对狭窄的无线电信道中，通过调制而获得较高的数据转输速率；第二，是由于多信道中射频传播的基本物理特性。,调制格式描述了如何将数据编码为一个射频信号，用于无线介质中的传输。　　,对于802.11a/g系统来说，在一个17 MHz带宽的射频信道中要想获得54 Mbps的数据速率，要求使用“high-order调制”方式来取得较高的光谱效率。

约找到 1041 条结果，耗时 0.392 秒

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注意事项：

当前账号的附件下载数量限制如下：