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/
_______________________________________________
_______________________________________________
TowerTalk mailing list
TowerTalk@contesting.com
http://lists.contesting.com/mailman/listinfo/towertalk
|