[TowerTalk] Low over ground beams : Moxon vs Jungle-Job

[john at kk9a.com]

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 at contesting.com
Subject:	[TowerTalk] Low over ground beams : Moxon vs Jungle-Job
From:	"Yan (XV4Y)" <xv4y at 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/