Ok, another cut at this with a much more complex model - 6 element 17m beam on a 48' boom. (I happen to have that model in EZNEC Pro4 and AutoEZ). Finding "resonance" isn't of much interest. What is
agreed - but I have modeled my 6 element 15 and 5 element 20's. They are conversions using a 15M6-125 to create a high strength 15M6DX (as it models much better, especially in a stack) which I call 1
On Mon,5/30/2016 10:45 AM, Grant Saviers wrote: My modeling (as G3TXQ comments) shows that max gain, min swr, and max f/b all happen at different frequencies. So, "tuning" a beam with swr seems like
Re the element to boom plates/clamps. I've found they make a noticeable difference with NEC4. However, they are hard to model since the Lawson substitute element diameters are so short to cause NEC 2
Yes, insulated elements are much easier and more accurate to model. I also try to avoid having very short segments in my NEC2 model. Insulated elements also make it easy to model the boom for interac
Thanks Grant, I worked with Greg, '8WWV, for quite a bit of the modeling - he would run my models using NEC4 ... and although he'd get a slight shift in frequency his results were similar to mine tha