[TowerTalk] On the subject of random wire antennas

[David Voit]

OK.  I did not recognize the high angle radiation pattern.  One more genius
idea into the trash.  I will do the standard thing of running it from tree
to tree so it is horizontal.  you'da thought with all the chemistry I
studied back in the day, I would have known that..  Too soon old, too late
smart.

David  Voit
WB6TOU

On Sat, Apr 22, 2017 at 3:06 PM, <w5prchuck at gmail.com> wrote:

> You mean a lot of high angle radiation, don’t you?
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>
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> Chuck W5PR
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> Sent from Mail <https://go.microsoft.com/fwlink/?LinkId=550986> for
> Windows 10
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> *From: *Tom Osborne <w7why1 at gmail.com>
> *Sent: *Saturday, April 22, 2017 3:39 PM
> *To: *David Voit <dvoit1944 at gmail.com>
> *Cc: *towertalk at contesting.com
> *Subject: *Re: [TowerTalk] On the subject of random wire antennas
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> It all depends on what your interests are.
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> A long vertical has a lot of horizontal takeoff compared to a quarter wave
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> antenna.  That is why the 40 meter vertical isn't a DX antenna.  73
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> Tom W7WHY
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> On Apr 22, 2017 11:28 AM, "David Voit" <dvoit1944 at gmail.com> wrote:
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> I am going to put up a random wire as a vertical in a tall pine tree and
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> place a remote tuner at the feed point and fed with coax.  Looking over the
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> info on random wires, there are various lengths to avoid depending on the
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> bands you choose to use.  I certainly want 80 meters and I see a variety of
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> lengths, 72, 85, 106 feet are acceptable.  All of those can be put up in my
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> trees with my pneumatic launcher and they would be a straight vertical
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> wire.  If  I want to use 160 meters, it looks like the shortest wire would
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> be 136 feet and the trees don't go that high.  (I already have a quarter
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> wave vertical for 160 at 123 feet and it works fine.   Just don't have the
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> extra 13 feet and don't want to wait for the tree to grow.)
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> I believe the best answer is to leave the quarter wave wire up and put up
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> the other antenna.  Of course, I don't want to do that as it requires
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> another coax run.  I would like to do one random wire for access to all
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> bands from that antenna, so, my question is would it work to put 136 feet
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> of wire up and over the top and headed back down but with maybe 3 or 4 feet
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> separation for the "hook" at the top?  I would guess 5 or 10 feet would be
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> more or less parallel to the portion going up but looping back down.  Luck
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> would decide how much is over the tip.  If the over the top hook causes
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> problems, I would default to the "best answer".
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>
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> The next part of the question is:  for a vertical wire, assuming I should
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> not do the 136 foot wire,  is there an advantage for choosing the longer
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> length among the choices for 80 and above?  Angle of radiation?
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> Efficiency, (given the feed point impedance  is high, does this relate to
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> low ground losses)?  I know many radials are important for a quarter wave
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> vertical but is it for a random wire?
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>
> And yes, I understand lightning is a problem.  I'm having fun and gladly
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> disconnect after use.  This does have the advantage of not needing relief
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> from the tree swaying in  the wind since it is parallel to the trunk.  My
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> dipole has to be lowered after I use it just to be sure it does not pull
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> apart.
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>
> David Voit
>
> WB6TOU
>
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