Posted by
Lyn WØLEN on
Mar 13, 2020; 6:19pm
URL: http://elecraft.85.s1.nabble.com/Off-Topic-Your-advice-suggestion-about-antenna-tp7658892p7658897.html
Duane -
I am of the mind that the antenna is the most crucial part of any station,
and probably the most often maligned. I have made a number of presentations
to ham groups on the design and construction process involved in getting
the most bang for the buck, depending on your wants and needs (everybody's
are different).
In my own situation (2 acre semi-rural lot approx.150 feet x 600 feet
running E-W feet, and active HOA) the goal was to have a single antenna that
would provide the best primary signal on 80 meters in a North-South
direction, while providing the best possible signal on 40 meters in an
East-West direction, consistent with the 80 meter performance and without
unduly provoking the HOA (or my XYL).
I decided on an Extended Double Zepp, cut for 3.5 MHz. That resulted in a
length of 360 feet, which worked nicely since I have 400 feet clear from the
house (West end) to a perfect tree for the far East end. And another tree
in the center for support of both the antenna and the feedline.
I am feeding it with a 160 foot length of 600 ohm "true ladder line." I can
go into more detail if this sounds like something that would work. Modeling
this antenna with EZ NEC shows a maximum theoretical gain of 4.7 dbi in both
North and South directions. With the ladder line, a dual hybrid balun and
short length of coax into the shack, my KAT500 tunes it very nicely on all
bands 160 m thru 6m.
I don't have your call so can't see where you are, but would be happy to
make other suggestions based on the coverage you seek.
73
Lyn, W0LEN
-----Original Message-----
From:
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Sent: Friday, March 13, 2020 11:52 AM
To: Lyn Norstad;
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Subject: Re: [Elecraft] Off-Topic: Your advice/suggestion about antenna
Hi Lyn - thanks for the reply!
I have 3 acres of wooded land.
Its pretty much on two different levels.
The house is located on the lower level.
And from there the grade goes upwards about 30 feet- and then levels off to
the second level.
Many elm trees which can support an antenna height of about 45 feet.
And I can cut through a path through them if necessary.
I have a 40m moxon pointed towards Asia at 45 feet hanging over solid rock
I've made a few DX contacts with it during the years when propagation was
peaking.
But right now I think its really to low to the ground to be useful.
I'm interested in what you have in mind.
Thanks
Duane
On Fri, Mar 13, 2020, at 12:31 PM, Lyn Norstad wrote:
> Duane -
>
> There are other wire antenna options that will far outperform a simple
> dipole, or for that matter a 2EL yagi.
>
> How much space do you have available?
>
> 73
> Lyn, W0LEN
>
>
> -----Original Message-----
> From:
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> [mailto:
[hidden email]] On Behalf Of
[hidden email]
> Sent: Friday, March 13, 2020 10:38 AM
> To:
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> Subject: [Elecraft] Off-Topic: Your advice/suggestion about antenna
>
> From what I understand - solid rock below a raised vertical is not the
best
> option for performance.
> With an underlying geography of many feet of solid metamorphic rock - that
> would probably rule out the low angle benefits of vertical antennas.
>
> Consequently, over the years, every 40m vertical I've ever put up has been
> out-performed by a dipole at .41 wavelength. I've also tried the DX-Half
> Square and vertical Delta Loop with the same results.
>
> It looks to me like my only option to outperform a 40m dipole - is a tower
> and (at minimum) a 2EL yagi.
>
> Would that assumption be correct?
> Thanks
> Duane
>
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