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Message-ID: <005101c6e888$76be7f30$6501a8c0@eagles>
From: "J. Allen" <vy1ja@northwestel.net>
To: <rsgb_lf_group@blacksheep.org>
References: <001301c6e829$a8a69370$6801a8c0@Radio> <004901c6e881$7ad2d320$0300a8c0@lark>
Date: Thu, 5 Oct 2006 14:13:31 -0000
MIME-Version: 1.0
Subject: LF: Math & advice
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Status: O

Alan, and All,

The top atttachment for the tower end of the horizontal wires at is at 100 
feet, these 390 foot long wires fan out from the vertical portion at a ~55 
degree angle to eachother and the other two ends are at ~63 and ~70 feet 
respectively.  There is ~10 ft of sag in the wires.

One person who gave me early help with the calculation said that the lower 
attachment points of  the wires out away from the tower also lowered the 
effective height of the vertical portion of the antenna significantly, being 
as low as the lowest part of the horizontal wires, and that is how I ended 
up with the number 2.85 for the antenna current for 1 W ierp.

Is capacity hat wire elevation significant in the calculations?

There are now four different numbers from as many people, and I am unsure 
how to proceed.  LF seems to be significantly art and partially science. 
:o)

I moved the thermocouple type RF ammeter to the line between the matching 
transformer and the loading coil and it reads exactly the same, 2.8 Amps.

Would it work better for me to wind a new matching transformer at the 
antenna on an iron or ferite core.  Is a metallic core likely to improve 
what I am seeing?   If so, would a TV core do the job?   The existing XER is 
a bifilar wound 1:1 air solenoid type.

J.
VY1JA