[amsat-bb] 4 omni antennas plots (nulls)

[Robert Bruninga]

> ANY antenna above ground, has multiple lobes.
> You can simulate this with any program like MMANA or EZNEC...
> <http://www.qrz.ru/schemes/contribute/arrl/chap3.pdf>

Yes, and that is my point too.

To get the good gain at medium elevations from an omni, one need a large
ground plane (screen, not radials) going out several wavelengths in all
directions.  In my emails I talk about being over a metal roof or large
chicken wire ground plane to properly hide the real ground reflections and
to block energy going down (which lose 3 dB) and hence all those high
angle nulls.

Bob, WB4APR


-----Original Message-----
From: AMSAT-BB [mailto:amsat-bb-bounces at amsat.org] On Behalf Of Roland
Zurmely via AMSAT-BB
Sent: Wednesday, March 16, 2016 6:30 PM
To: AMSAT
Subject: [amsat-bb] 4 omni antennas plots (nulls)

Hi Bob WB4APR,
ANY antenna above ground, has multiple lobes.You can simulate this with
any program like MMANA or EZNEC...
<http://www.qrz.ru/schemes/contribute/arrl/chap3.pdf>
73 de Roland PY4ZBZ




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