The Jungle-Job appears to be a horizontal antenna which would make it a
cloud warmer at that height. Are you sure this is modeled correctly? You
probably would be better off using two verticals, one could be parasitic.
John KK9A
[TowerTalk] Low over ground beams : Moxon vs Jungle-Job
from [Yan (XV4Y)] [Permanent Link][Original]
To: towertalk@contesting.com
Subject: [TowerTalk] Low over ground beams : Moxon vs Jungle-Job
From: "Yan (XV4Y)" <xv4y@nature-mekong.com>
Date: Fri, 8 Aug 2014 10:48:52 +0700
Hi,
I want to build a portable antenna for 20m. This antenna will be installed
temporarily at a low height, around 3m above ground (10?).
I?ve modeled two antennas in MMana-GAL and compared their gain : one
Moxon, one
Jungle-Job (G4ZU).
The Jungle Job is a clear winner, showing almost no degradation in its gain
diagram from a « high location » (above 1/2 lambda).
On another hand, the Moxon shows a drop of 3dB in max gain, and the max
gain is
at 60° elevation, versus 22° for the Jungle-Job.
At 10°, the Jungle Job still has 7,4dBi gain, while the Moxon shows a -2,3dBi
loss?
The diagrams are on my blog.
Don?t worry about the article in french, it does not contain more details
than
the diagrams.
http://xv4y.radioclub.asia/2014/08/08/antenne-directive-portable-proche-du-sol-comparaison-entre-jungle-job-et-moxon/
73,
Yan.
---
Yannick DEVOS - XV4Y
http://www.qscope.org/
http://xv4y.radioclub.asia/
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