[Antennaware] Modelling help needed for160 m L-antenna on 20m
Guy Olinger, K2AV
olinger at bellsouth.net
Tue Jan 30 12:09:21 EST 2007
The pattern for either band resembles a water lily, many small lobes
at various elevations around the entire compass, with more power at
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.
----- 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
I have a 135 feet L-antenna (70 feet vertical, 65 feet horizontal) for
meters with about 20 ¼ wave radials to it. It works well on 160 m and
also resonant with low SWR on 24 Mhz and 28 Mhz. I now wonder how does
elevation and azimutal pattern look like on the latter two bands? Is
any low angle take offs or is it a "cloud warmer" on the 24, 28 Mhz
Can anyone help me with the modelling since I am not an expert on this
do not have EZNEC 3 or 4. I do happen to have the EZNEC wire model
the L-antenna from ARRL Compendium if that helps.
Thanking in advance!
73s de Kari, SM0HRP
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