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Re: [TowerTalk] Tower and antenna decisions

To: towertalk@contesting.com
Subject: Re: [TowerTalk] Tower and antenna decisions
From: "Joe Subich, W4TV" <lists@subich.com>
Date: Fri, 25 Oct 2013 13:03:37 -0400
List-post: <towertalk@contesting.com">mailto:towertalk@contesting.com>

Only a small portion of the LP elements carry significant current on
a given frequency - only a "few" elements are "active".  This means
that the gain of an LP is generally equivalent to a non-optimum two
element or short boom three element antenna at best.  Given the limited
number of active elements and the sub-optimal currents, side and back
rejection are generally significantly poorer than a well designed Yagi.

Log Periodic antennas provide coverage of a lot of "useless" spectrum
at the cost of efficiency, reduced performance in the narrow amateur allocations and substantial mechanical complexity.

73,

   ... Joe, W4TV


On 10/25/2013 12:45 PM, Jim Brown wrote:
On 10/25/2013 9:38 AM, Gene Fuller wrote:
Would you like to add any comments regarding LP's.

I don't know enough about them to comment.  I've only heard that their
gain is relatively low compared to a Yagi with the same boom length. It
has long been well known that the gain of a Yagi is related to boom length.

73, Jim K9YC
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