[Elecraft] how to optimize end-fed?

[David Kuechenmeister]

I think 42 might be a valid answer, depending on the question. Forty-one is certainly a good answer!
There are a couple pages that try to address the question of what long wire lengths are the easiest to tune, i.e. present a low SWR to the matching unit.
The first is at http://udel.edu/~mm/ham/randomWire/ and it's work is derived from what was presented here, http://www.qsl.net/on7dy/Documentation/Best%20%20Random%20Wire%20Antenna%20Lengths.htm
Hope this helps a little. With my KX3 tuner, it doesn't seem to matter much what I use for a long wire. The tuner does a good job matching the antenna to the rig.
vy 73,Dave N4KD 

    On Friday, September 30, 2016 4:01 PM, Fred Jensen <k6dgw at foothill.net> wrote:
 

 Let me see if I understand the question:  You're looking for a simple 
algorithm to tell you how to "best" deploy a wire of indeterminate 
length in a configuration yet to be specified using a transformer of 
indefinite impedance ratio on any of a number of unnamed bands.

This is reminiscent of one of the five volumes in Douglas Adams' 
trilogy, "The Hitchhikers Guide to the Galaxy."  The people build a very 
powerful computer and then asked it, "What is the meaning of the 
Universe?"  The computer begins to compute, as is the wont of computers, 
and worked on the problem for a very long time.  Finally, it announced 
that it had determined the answer.  By this time, there was no one in 
the Universe that remembered the original question.  When asked for the 
answer, the computer replied, "Forty Two."

Possibly "forty two" would work for you as a rule of thumb? :-))

73,

Fred K6DGW
- Sparks NV DM09dn

- Northern California Contest Club
- CU in the Cal QSO Party 1-2 Oct 2016
- www.cqp.org

On 9/29/2016 11:24 PM, Holger Schurig wrote:
> Fred Jensen <k6dgw at foothill.net> writes:
>
>> How long is the wire?
>> What band?
>
> Who knowns?  I'm not asking for a *specific* optimization, I'm asking
> for a general rule of thumb.
>
> I'm not talking about a permanent installation, I'm talking about going
> to some field, or hill. I don't know the band in advance, I don't know
> the propagation conditions. And I have several lengths of wire with me,
> I can adjust the wire length. And given the circumstances of the
> location, even the layout of my wire (only on fiber glass post, between
> tree and fiber glass post, etc) will change (e.g. sloper, vertical,
> etc). Even the high will be undefined and/or changeable.

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