http://www.wx7s.com/wordpress practical amateur radio Sat, 16 Jan 2010 09:44:28 +0000 http://backend.userland.com/rss092 en There's a good article based on an EZNEC model on VK1OD's web site. He has an article about optimizing a G5RV supported with models: http://vk1od.net/antenna/G5RV/optimising.htm And an article about feeding the G5RV at: http://vk1od.net/antenna/G5RV/index.htm And the EZNEC model is available for download at: http://vk1od.net/antenna/G5RV/G5RV.EZ http://www.wx7s.com/wordpress/?p=274 The reading material I'll be referring to is L.B. Cebik's QST article series 'A Beginner's Guide to Modeling with NEC'. I plan to discuss a number of antenna modeling programs here, so this will go on considerably longer than the original articles. One of the best courses was originally written by ... http://www.wx7s.com/wordpress/?p=272 I first got interested in models and modeling when I was at University. I learned to build them mathematically, to do them by hand, and I learned to build them using a computer. I did a lot of modeling for departments as a way to support myself while at school. ... http://www.wx7s.com/wordpress/?p=270 A question I often have to deal with is just how important the geometry is to the antenna radiation pattern. Most people with some experience know that it IS important, but they don't know just how important. Let's consider a very simple model. In this case, I'm going to model two ... http://www.wx7s.com/wordpress/?p=259 Happy Square Root Day! Today is 3/3/9 ... 3 X 3 = 9 ... √9 = 3 Square Root day and other mathematically oriented dates happen occasionally. There was 2/2/4 and there will be 4/4/16 coming up and more through the end of the century. There's even a contest associated with the ... http://www.wx7s.com/wordpress/?p=251 I'm finally back online and able to post again, so I'll be starting again in the next several days as I catch up with things. What amazes me most while I've been offline is the volume of spam posts there have been to the blog. So many attempts to get ... http://www.wx7s.com/wordpress/?p=249 In responding to a recent question, I spent some time thinking about the objectives in building an antenna system. Unless you're just playing around (which of course is its own objective) you probably have some reason to put up the antenna. When making decisions about your antenna system, you need ... http://www.wx7s.com/wordpress/?p=247 I've created a new menu item above called 'Downloads' where I've placed all of the files uploaded to the AntModel group by Tom Holden VE3MEO in his investigation of the Miracle Whip. I'll add more structure to the area and more files to download after things get settled with my ... http://www.wx7s.com/wordpress/?p=245 We're in the process of packing and moving right now (I expect to actually move in about a week), so while I'll try to post some updates during that time, problems with Internet access and such will likely cause difficulty getting online. I'll be picking up again for sure once ... http://www.wx7s.com/wordpress/?p=236 We had a question posted to the Antenna Modeling group which presents an interesting modeling problem. ----------------- Message -------------------------------- I am using EZNEC+ 4.0 and I am trying to model the effect of increasing the spacing between the inside ends of a simple split dipole. I can't figure out how to place the source ... http://www.wx7s.com/wordpress/?p=230