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>Pete, I have an EZNEC 3 C31XR stack model if you want to run it and >play around with it. I think you gave me yours already, Guy -- thanks. I differ to some degree with respect to the point-source issue and TA (though I mainly use YT -- I believe TA and YT are different implementations of the same algorithm). When this issue first surfaced on the reflector a few months ago, I did some tests, and they seemed to indicate that the anomalies don't arise except at spacings far closer than anything we'd even consider. One reason for using YT (particularly the former) to evaluate stacks is that it gives you the ability to compute a figure of merit for the antenna on a given band vis-a-vis a particular target area, such as Europe from here. This way you can quantify statements like "favoring 20 at the expense of 15 and 10." Unfortunately, I'm not aware of the existence of arrival angle statistics for the Cyprus to US East/Mid/West path, though it could be argued that the reciprocal of the US to Europe stats would probably not be far off. Which Force12 numbers don't you accept? C-31 stack spacings? 73, Pete N4ZR Check out the World HF Contest Station Database at www.pvrc.org -------------------------------------------- Force12Talk mailing list provided as a service by Force 12 Antennas, Inc. Force12 Web Site: http://www.force12inc.com To Submit Message to the List: Force12Talk@qth.com To unsubscribe and view the Message Archive: see http://qth.com/force12/list For problems with the list: contact n4zr@qth.com |