[Antennaware] Modelling help needed for160 m L-antenna on 20m

[Guy Olinger, K2AV]

The pattern for either band resembles a water lily, many small lobes
at various elevations around the entire compass, with more power at
higher angles.

Low SWR on 24 and 28 may indicate loss in the system at those
frequencies as modeling over ideal ground gives impedances that are
definitely not going to be interpreted as "low" swr.

Given how small antennas are at 24/28, there are numerous basic and
easy to construct designs that would perform far better, including a
simple rotatable dipole.

73, Guy

----- Original Message ----- 
From: "Kari" <kari.gustafsson at swipnet.se>
To: <antennaware at contesting.com>
Sent: Monday, January 29, 2007 5:26 AM
Subject: [Antennaware] Modelling help needed for160 m L-antenna on 20m


Hello,

I have a 135 feet L-antenna (70 feet vertical, 65 feet horizontal) for 
160
meters with about 20 ¼ wave radials to it. It works well on 160 m and 
is
also resonant with low SWR on 24 Mhz and 28 Mhz. I now wonder how does 
the
elevation and azimutal pattern look like on the latter two bands? Is 
there
any low angle take offs or is it a "cloud warmer" on the 24, 28 Mhz 
band?
Can anyone help me with the modelling since I am not an expert on this 
and
do not have EZNEC 3 or 4.  I do happen to have the EZNEC wire model 
file for
the L-antenna from ARRL Compendium if that helps.

Thanking in advance!

73s de Kari, SM0HRP

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