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Re: [TowerTalk] Coax Loss

To: "Tower and HF antenna construction topics." <towertalk@contesting.com>
Subject: Re: [TowerTalk] Coax Loss
From: "Jim Brown" <jim@audiosystemsgroup.com>
Reply-to: "Tower and HF antenna construction topics." <towertalk@contesting.com>
Date: Thu, 04 Feb 2010 10:25:35 -0800
List-post: <towertalk@contesting.com">mailto:towertalk@contesting.com>
On Thu, 4 Feb 2010 09:56:41 -0800, Marlon K. Schafer wrote:

>That'll really depend on a number of factors.

>What frequency are you using?

>What kind of cable is involved?

The frequency and cable construction determine the loss at a given 
frequency. The loss in dB is still proportional to the length of the cable. 
If you know the loss in dB at the frequency you care about, it's no more 
complicated than multiplying by the length ratio. 

>Here's a very slick calculator from www.timesmicrowave.com.  Almost all of 
>the coax I use is LMR cable from them.

Don't believe everything you see on the LMR website. They make good cable, 
but some of their loss specs are "optimistic," especially at HF. If you 
only use their cable, you may be paying a premium for dB that only exists 
in their marketing department. 

73,

Jim K9YC




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