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Re: [TowerTalk] Using Stubs to Reject Harmonics

To: "" <>
Subject: Re: [TowerTalk] Using Stubs to Reject Harmonics
From: "Jim Brown" <>
Reply-to: "Tower and HF antenna construction topics." <>
Date: Thu, 04 Feb 2010 00:50:19 -0800
List-post: <">>
On Wed, 3 Feb 2010 20:24:47 EST, wrote:

> For example, a 100ft length of RG213 has about 10 dB loss at 432 MHz

That would be some pretty awful coax -- Belden's RG8X (9258) is only 
6.6dB/100 ft at 400 MHz, and a decent RG8-sized coax is on the order of 
3dB/100 ft. 

Yes, an infinitely long line looks like a resistor equal to its own Zo, 
even with an open circuit as a load but it takes more like 1,000 ft to 
approach that at 432 MHz. 


Jim K9YC


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