Posted by
Geoffrey Mackenzie-Kennedy on
Dec 14, 2009; 8:45pm
URL: http://elecraft.85.s1.nabble.com/antenna-farm-tp4165832p4166645.html
Hello Clint,
While planning your antenna farm, have you considered using an antenna
modelling program such as EZNEC which could be of great help to you. A free
version comes with the ARRL Antenna Handbook.
Due to the effect of nearby objects such as above ground power lines, metal
gutters etc etc and trees on antennas, such a program cannot be expected to
tell the whole truth unless these objects are included in the model, which
can be difficult to do properly, but it can and usually does show the effect
of other nearby antennas on the pattern of the antenna in use.
Unfortunately the geographical bearing to a distant DX station is not always
the same bearing at which the signal actually arrives. For example here on
40m the short path into CA is often "skewed" by as much as 50 degrees via
Central /S.America. Also the vertical angle of arrival of the closer East
Coast stations can vary considerably - often very high angle.
The variation in bearing and angle of arrival of long distance DX stations
here on 15m is usually very much less.
So my suggestion FWIW is that you consider using EZNEC to plan your farm,
put up an antenna which serves your main operating interests and directions
(within the imposed constraints), and add other antennas ONLY if they do not
compromise the performance of your "main" antenna. This does not answer your
questions directly, but if you use EZNEC you should be able to get some
ideas.
73,
Geoff
GM4ESD
Clint <
[hidden email]> wrote on Monday, December 14, 2009 at 6:17
PM
Fellow Elecrafters,
I have a feeling this may open the flood gates but here goes.
I am a newbie Ham but a long time SWL going back to my Knight Kit Star
Roamer. I am fixin' to set-up my antenna farm. OK, it will be more like an
antenna garden as I have a small house and lot. My K3/100 has a KAT3 and
KRX3. I plan on using 3 Dipoles and maybe an inverted V for diversity
receive (what a great feature). I got on Google Earth and plotted out the
areas I am interested in. I live just up the street from Elecrafts new HQ
(talk about fast service) on the central coast of California (CM96CX).
<snip>
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