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Re: [TowerTalk] coax 'sweet lenght'

To: Tom Rauch <w8ji@contesting.com>,"FireBrick" <w9ol@billnjudy.com>,"TowerTalk List" <towertalk@contesting.com>
Subject: Re: [TowerTalk] coax 'sweet lenght'
From: Pete Smith <n4zr@contesting.com>
Date: Tue, 12 Oct 2004 21:12:22 -0400
List-post: <mailto:towertalk@contesting.com>
On the other hand, if the load is not matched to the transmission line, which happens in the real world a lot, a transmission line that is a multiple of 1/2 wavelength will at least make sure that the antenna's feedpoint impedance is not transformed by the transmission line, and that the apparent resonance does not change. This may make no difference (it doesn't here) but may help to explain the idea of the "sweet spot."

73, Pete N4ZR

At 11:13 AM 10/10/2004, Tom Rauch wrote:

A large change in transmission line loss can also cause SWR
to be gradually changed along the line, but it is a smooth
slope and does not have peaks and valleys every 1/4 wl.

So as Dave says, it is a myth that a line feeding a single
antenna  has a specific "sweet length". If the system is
behaving properly, SWR is constant.

73 Tom


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