tag:blogger.com,1999:blog-1060885526021532808.post250457145143924618..comments2022-03-28T09:14:38.093+03:00Comments on OH3GGQ Sauli: A vertical dipole for 7MHz (and 21MHz)oh3ggqhttp://www.blogger.com/profile/01590562918564177184noreply@blogger.comBlogger6125tag:blogger.com,1999:blog-1060885526021532808.post-17443528954300889992013-09-07T23:03:06.818+03:002013-09-07T23:03:06.818+03:00Actually it is exactly 10 meters high. Also the th...Actually it is exactly 10 meters high. Also the three radials are 10 meters...Optimal length would be a little bit shorter, but SWR is less than 1:1.3 now.oh3ggqhttps://www.blogger.com/profile/01590562918564177184noreply@blogger.comtag:blogger.com,1999:blog-1060885526021532808.post-65740340026140231102013-09-02T06:38:59.407+03:002013-09-02T06:38:59.407+03:00What final length did you wind up with on your ver...What final length did you wind up with on your vertical dipole ?? Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-1060885526021532808.post-65494548684250122212011-10-27T17:32:17.557+03:002011-10-27T17:32:17.557+03:00Later I realized that the inverted-v (mentioned in...Later I realized that the inverted-v (mentioned in the previous comment) outperformed my vertical dipole. Obviously the vertical dipole is not high up enough. The last try, a GP 12 meters up, is even better, and may be my last 40m antenna before the future 3-elemement beam :) <br /><br />Here is my antenna "park" as of October 2011:<br />http://oh3ggq.blogspot.com/2011/10/autumn-2011-antenna-pictures.htmloh3ggqhttps://www.blogger.com/profile/01590562918564177184noreply@blogger.comtag:blogger.com,1999:blog-1060885526021532808.post-61125109180139162272011-06-03T21:47:17.372+03:002011-06-03T21:47:17.372+03:00I modified this vertical dipole, made it an invert...I modified this vertical dipole, made it an inverted v-dipole: http://oh3ggq.blogspot.com/2011/06/inverted-v-dipole-for-40m.htmloh3ggqhttps://www.blogger.com/profile/01590562918564177184noreply@blogger.comtag:blogger.com,1999:blog-1060885526021532808.post-10209244680964715112011-05-03T19:41:25.629+03:002011-05-03T19:41:25.629+03:00The wire is about half a meter from the three, bet...The wire is about half a meter from the three, between the branches. The tree is in connection with the ground, and an alive tree is quite dense, so it possibly affects the antenna in a negative way. Of course the effect would be more severe with UHF and microwave antennas :) <br /><br />Hmm...guy wire. Maybe a stack of verticals hanging from it...too heavy? If I can get wires horizontally between my trees, I might start thinking about horizontal dipoles or loops. I don't have a proper antenna for 80 meters, but I do have space for a horizontal full-size halfwave dipole. For DX working I might consider vertical stuff even for 80 meters, L dipole maybe? And 160m? I am just in the beginning of my antenna experiments.oh3ggqhttps://www.blogger.com/profile/01590562918564177184noreply@blogger.comtag:blogger.com,1999:blog-1060885526021532808.post-85832891502746245522011-05-02T22:41:20.394+03:002011-05-02T22:41:20.394+03:00The antenna wire is touching the tree? I am wonder...The antenna wire is touching the tree? I am wondering if the trunk has some influence on the operation. You could also use a guy line between two trees and hang the vertical from the line mid point. A 80 m folded vertical would be also interesting to try. That is the extra wire height is put into horizontal direction at the dipole ends.<br /><br />73, Jaakko OH7BF/F5VGLOH7BFhttp://sral.fi/oh7bfnoreply@blogger.com