[Elecraft] K3 & S9 43' Vertical

[Guy Olinger K2AV]

One important thing to note here is that Phil has avoided one of the lossy
gotcha's in his matching for using 43' with 80/160 by using a large (4 inch
OD) and expensive (30 smackers) #2 powdered iron toroid, Amidon's T400-A2.
 Don't try to short cut or cheep cut this step because you are only running
100 watts or QRP.  It's the LOSS AVOIDED by using this toroid that is
actually more important running 100 watts and even more important running
QRP.

If one really wants to know why, you can get down and dirty in Jerry
Sevick's book, where you will find most of the how-come's in chapter 9, and
how he uses a T400-A2 in a bifilar winding that actually performs correctly
at 160.  See figure 9-6 and 9-G on pp. 60, 61 of "Understanding, Building,
and Using Baluns and Ununs -- Theory and Practical Designs for the
Experimenter", Jerry Sevick, W2FMI (SK),  2003, CQ Communications, Inc,
Hicksville, New York.

On Tue, Mar 22, 2011 at 12:51 PM, Julius Fazekas n2wn
<phriendly1 at yahoo.com>wrote:

> Hi Tom,
>
> Check out Phil's, AD5X, site: http://www.ad5x.com/articles.htm
>
> He has written a number of articles related to your questions. Good
> information with plenty of "how to" ideas with locally found materials.
>
> Elecraft's Balun kit is also capable of 1:4 unun and will easily work with
> any 100 watt rig.
>
> QST has had several items related to the ubiquitous 43' verticals that are
> all the rage now. I see at least one person has mentioned radials, which
> are
> a must have to effectively use this antenna on 80-30.
>
> The K3's ATU is very effective, but keep in mind that you will be matching
> the feedline and antenna as a unit, versus matching just the antenna. The
> K3
> will most likely find a match most of the time, but you still could be
> seriously mismatched at the antenna. It may work, it just won't work well.
>
> GL es 73,
> Julius
>
> -----
> Julius Fazekas
> N2WN
>
> Tennessee Contest Group
> http://www.k4ro.net/tcg/index.html
>
> Tennessee QSO Party
> http://www.tnqp.org/
>
> Elecraft K2        #4455
> Elecraft K3/100 #366
> Elecraft K3/100 #1875
> --
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