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Much of signal loss depends on the geometry of the system you are passing your signal through. Any good look-up table will have standard attenuations for various types of cables, but for any "home-built" device, it would probably be easier to empirically measure than to calculate.

-Will

Posted
where can I find the look up table.

 

First, figure out the type of cable you are interested in. Next, either find a manufacturers website, or a distributer, and look at its data sheet. Alternatively, call anywhere around you that sells tranmission lines and ask data sheets for their products. Also, Horowitz and Hill's Art of Electronics has characteristics of some common transmission lines (though its becoming out of date).

-Will

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