More questions from a yagi stacking rookie! I've been using the HFTA software to try and get an idea of the optimum distance to stack a couple yagis for best performance. I'm stacking 10/15/20 triban
In most cases when vertically stacking hf antennas you are not looking for 'increased performance' as in adding the two patterns to maximize the lowest angle lobe or a horizontal pattern. In most cas
I am planning on stacking another 4 ele SteppIR on my tower. I currently have a 4 ele SteppIR at 70ft. I do not live on flat ground. Running HFTA it became clear that the top antenna was too high on
Gary, while HFTA is a wonderful tool to use to design the station ... there are some "traps" to watch for ... <see text and source below>. Sounds like you need to check and confirm that is not what i
HFTA is a terrific program but it has a known error when analyzing stacked antennas. It gives you good guidance for deciding the heights of stacked antennas to optimize the pattern for your particula
What optimum performance are you looking for? If you are looking for a specific radiation angle , I guess the software would put both antennas close to each other. The real advantage to stacking is t
Pete, N4ZR wrote a great article in the July/August 1996 NCJ title titled, "A Preliminary Look at Improved Stack Spacing for Short-Boom Tribanders". That might also provide insight as to specifics. H
W3ZZ has some interesting information in the January QST focused on 50 mHz and up but perhaps the calculation of effective aperture is relevant to HF? (Page 82-83). Rich NU6T Pete, N4ZR wrote a great
Thanks for the nice plug, Billy - In a computer disaster here, I lost my electronic copy of that article. If anyone has it on CD and could send it to me I'd sure appreciate it, and will post it on my
I've been using the HFTA software to try and get an idea of the optimum distance to stack a couple yagis for best performance. I'm stacking 10/15/20 tribanders for increased performance. I was really
Personally, I think 30 feet spacing is as low as I would go for tribanders, especially if I had the ability to select top/bottom/both. 73, Dave AB7E ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Author: Larry DiGioia N8KU <towertalk@longwire.com>
Date: Sat, 19 Jan 2008 20:35:56 -0500
OK, you guys are starting to worry me. I just bought 4 more sections of Rohn 45 to get my 70-footer up to 110' in preparation for putting up my dream antenna - an M2 10-30LP8 Log Periodic. 115' seeme
110' is probably a good height for 20m. When sunspot activity increases, stations with a 30' high tribander will be much stronger than you on 10m. John KK9A OK, you guys are starting to worry me. I j
Larry, Unless the terrain in front of your antenna is sloped more than two or three degrees for at least several thousand feet, your antenna will work very well at 115 feet. In two or three years --
Hi, Bill. I didn't state that very well. I was trying to say that 30 feet SPACING was as little as I would use for the tribanders. I wasn't referring to the height. By the way, I do have that that so
Thanks for all the good input. I found a lot of info in the antenna book last nite as well, I should have done some reading in their first. I'm assuming that, in HFTA, I'd better not trust too much a