Eddie
can you add 4 radials to the vector model above ?, W8JI & Henry HPSD have said it benefits from radials.
Eddie,
its in the discussion on eham that bootymonster started years back when he made his homebrew vector 4000,
https://www.eham.net/forum/view?id=topic,75921.0.html
W8JI said
"When the mast and feedline is included in the model, the "Dominator" falls apart. The exception to this is if we add a groundplane at the junction of the cone and the mast and coax. Many antennas get modeled without proper representation of feedlines"
Bob, is the above quote suggesting that W8JI was talking about Donald's Dominator?
I agree, a model without a feed line can be a bit misleading if the results are altered. Truth is, we see models like this all the time on the Internet and this forum.
Adding a feed line is rare, but sometimes in my models I see very little difference on adding the line to the model. IMO, that is the way it should be but I can't predict it.
To me this issue, without a feed line, becomes important when a model shows CMC that are bad enough to alter the pattern and gain. Then it becomes necessary to mitigate the CMC somehow.
Bob, when I re-read some o BM thread on eham, I happen to agree with most of what I read and can remember that Dale said. Some of his comments I've agreed with for along time.
I don't see where Henry made and exception to what I remembered about his model of the Vector with radials. He talked about radials right at the feed point. My models were at 14.5" below and another at 3" inches below. There I saw the 3" idea produce different results, but I don't remember the details. He also set the feed point at the bottom, rather than using the gamma match. He did not explain why, and I don't see where he talked about the feed line making some difference either. So, I still am missing the point you're making.
It is not you Bob...I still have a problem with side effects of Covid19, and I fear worse may come. Sometimes I can't work. So, consider that if I say something out-of-line, OK.
