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发表于 2009-11-14 23:58:23
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10# chen_zhenfeng
There is a specific topic in this book that I have not seem covered inany of the 25+ book that I have on electromagnetic phenomena. The topicis the shield cut-off frequency of a coaxial cable. Common-modecurrents at low frequencies (below a few hundred hertz) cause noiseproblems with coaxial cables, but signals above tens of kilohertz donot. This is vital data which is apparently not explained in many textbooks. For me, this topic justifies the cost of the text. Having saidthat, I am annoyed because the book is quite expensive relative toother books of its size and age. The point is that you have to buy it,but it is expensive to do so. |
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