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1. Topband: EZNEC Shunt Feed Model Gain (score: 1): Author: k8gg@voyager.net; Date: Tue, 18 Aug 2009 10:42:05 -0400 (EDT); Fellow Topbanders: I made a model of a shunt fed Rohn 45G tower with a 2 element short 40 meter beam on top. I used 78 feet of tower plus 12 feet of 2.375 inch diameter mast plus the actual dimensio; /archives//html/Topband/2009-08/msg00075.html (7,040 bytes)
2. Re: Topband: EZNEC Shunt Feed Model Gain (score: 1): Author: Guy Olinger K2AV <olinger@bellsouth.net>; Date: Tue, 18 Aug 2009 19:11:29 -0400; I would need a copy of your EZNEC model to be sure, but one of the elephant-in-the-room issues in modeling vertical antennas has to do with modeling the ground connection. If you look at the current; /archives//html/Topband/2009-08/msg00077.html (8,277 bytes)
3. Re: Topband: EZNEC Shunt Feed Model Gain (score: 1): Author: Bob Kupps <n6bk@yahoo.com>; Date: Tue, 18 Aug 2009 16:12:21 -0700 (PDT); Hi George I have been modeling a 3 el vertical yagi over the rice paddy ground we have here in HS land and after tweaking everything got around 9 dBi of forward gain. After modeling a gamma match for; /archives//html/Topband/2009-08/msg00078.html (8,604 bytes)
4. Re: Topband: EZNEC Shunt Feed Model Gain (score: 1): Author: Dan Zimmerman N3OX <n3ox@n3ox.net>; Date: Tue, 18 Aug 2009 22:59:48 -0400; There are other issues important to shunt fed towers. NEC-2 has issues with sources in small loops. For standard NEC-2 (not double precision NEC-2D or NEC-4 according to the manual) that seems to be; /archives//html/Topband/2009-08/msg00079.html (8,677 bytes)
5. Re: Topband: EZNEC Shunt Feed Model Gain (score: 1): Author: K4SAV <RadioIR@charter.net>; Date: Wed, 19 Aug 2009 09:31:13 -0500; Modeling a gamma match for a tower is almost impossible to do in NEC2. It can't handle a junction of wires that have large differences in diameters. Check to see if the program is making errors. If y; /archives//html/Topband/2009-08/msg00080.html (7,637 bytes)

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