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## Re: [TowerTalk] Coax Loss

 To: "Tower and HF antenna construction topics." Re: [TowerTalk] Coax Loss Dan Zimmerman N3OX "Tower and HF antenna construction topics." Thu, 4 Feb 2010 12:36:21 -0500 mailto:towertalk@contesting.com>
 ```K9YC says: > So if you double the length, you > double the loss. > Jim, of course you gave the right answer overall, and of course you meant you "double the dB loss" but this sentence is the crux of the issue, so I want to expand with a few examples. You don't "double the loss" in terms of power out vs. power in by doubling the length. yet that is what the English language sentence "you double the loss" suggests. If the loss in length X is 1.5dB, you end up with 1.41 times the loss in the doubled length. If it's 3dB, you double the loss by doubling the cable (this is the special case :-) ) If the loss is 4.77 dB per unit length, you triple the power loss by doubling the cable. If the loss is 7dB in the length you've got, you quintuple the power loss by doubling the cable. If it's 10dB, you end up with 10 times the loss in the doubled cable. - - - - - - - - - - - - - All of the answers given correctly say "if you double the length, you double the dB" But we should be careful with "if you double the length, you double the loss," because it's the root of this particular confusion. 73 Dan _______________________________________________ _______________________________________________ TowerTalk mailing list TowerTalk@contesting.com http://lists.contesting.com/mailman/listinfo/towertalk ```
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