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	<title>骆驼调频 &#187; db</title>
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		<title>db和dbm的区别</title>
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		<pubDate>Sun, 29 Nov 2009 16:41:00 +0000</pubDate>
		<dc:creator>骆驼</dc:creator>
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		<description><![CDATA[DB 是一个纯计数单位：dB = 10logX。dB的意义其实再简单不过了，就是把一个很大（后面跟一长串0的）或者很小（前面有一长串0的）的数比较简短地表示出来。如： X = 1000000000000000（多少个了？... ]]></description>
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		<title>将dBm转换为W的口算方法</title>
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		<pubDate>Sat, 28 Nov 2009 17:04:04 +0000</pubDate>
		<dc:creator>骆驼</dc:creator>
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		<description><![CDATA[dBm是一个表示功率绝对值的值（也可以认为是以1mW功率为基准的一个比值），计算公式为：10log（功率值/1mw）。 这里将dBm转换为W的口算规律是要先记住“1个基准”和“2个原则”： “1个基准... ]]></description>
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