For some good advice on modeling fans see
https://ac6la.com/aecollection4.html
Also, they are sensitive to height above ground so modeling at the
installed geometry is advised. Using the modeling technique developed
by Cebik that AC6LA describes has yielded good results for me.
Otherwise there can be interactions that lead to a lot of cut and try
frustration.
Grant KZ1W
On 7/11/2018 12:12 PM, Jim Brown wrote:
On 7/11/2018 10:52 AM, Bruce Jungwirth wrote:
I’m looking for someone in or around St Paul Mn that is fluent in EZNEC.
A principal value of EZNEC and other modeling software is as a
teaching tool, and you only learn from it when YOU do it. It's not all
that difficult to learn once you get over the fear factor. The free
version that comes with the ARRL Antenna Book will model simple
antennas like you're thinking about.
Here are several studies I've done to help think about problems like
yours.
http://k9yc.com/VertOrHorizontal-Slides.pdf
http://k9yc.com/VerticalHeight.pdf
http://k9yc.com/43FtVertical.pdf
http://k9yc.com/AntennaPlanning.pdf
I am a big fan of fan dipoles. A good rule is to not try to put more
than three elements in the fan. 80/40 makes a good fan, so does
20/15/10. Although I haven't done it, i suspect that 30/17 would too.
73, Jim K9YC
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