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| W5GI 'mystery antenna' | |
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| Tweet Topic Started: Friday, 7. October 2011, 05:29 (2,101 Views) | |
| Deleted User | Friday, 7. October 2011, 05:29 Post #1 |
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Has anyone had experience of the W5GI dipole? I am looking to replace my monoband 40m dipole with a multibander. cheers, adonis |
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| Mark in Essex | Friday, 7. October 2011, 07:30 Post #2 |
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26 Charlie Tango 037
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Have a look here Ellis http://www.eham.net/reviews/detail/4552 Gets a very good write by most |
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[][img][/img][/url] https://www.youtube.com/user/26TANGOMIKE037/videos Nembutol numbs it all But I prefer alcohol | |
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| Deleted User | Friday, 7. October 2011, 09:09 Post #3 |
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Hi Mark, Thanks for the link - good stuff. I really do need to homebrew a multiband dipole which is no longer than 100 feet and tunable between 80m - 10m. I'll post back when I've has a look at the pros and cons. Oh well, back to my reading. cheers, adonis |
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| KieranStoke | Friday, 7. October 2011, 09:09 Post #4 |
26 Charlie Tango 544
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Looks interesting, I was going put up a window but think that could change my mind |
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| Deleted User | Friday, 7. October 2011, 09:47 Post #5 |
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Yep. I have space for a 133 foot antenna but, the ends of each leg are too low with respect to ground because I have to bend them to fit. With a 100 foot length of wire I should be able to get the wire ends up about 25 feet above ground level. Hopefully, the antenna should be more efficient. I think at the end of the day it'll be swings and roundabouts but hey-ho its worth a go. cheers, adonis |
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| Deleted User | Saturday, 8. October 2011, 10:38 Post #6 |
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Quick update: I've had a quick look for a multiband dipole specific to my needs i.e. 80m - 10m and at least resonant on 80m, 40m, 20m and 10m. The WARC bands of 12m and 15m would be a bonus. The other criteria was that its total length not exceed 100 feet. It's final configuration will be flat-top not inverted V shape. I first looked at the W5GI (see previous post) and this ticked most of my boxes but there are discrepancies in band resonance between real world and modelled scenarios. This would be my second choice antenna for a future date. I then looked at a G5RV derivative by ZS6BKW and this looks really good, providing you have a G5RV to play with. This variant enables you to work more of the bands on which the G5RV is resonant and also allows you to work new bands. All you do is cut 7 plus feet off your wire and add 11 feet of twin feed to the existing ribbon. This shifts the resonant frquencies and allows you more bandwidth/ more bands. The modelling data is great as well so you can see what to expect before you build or buy. Link below (96 pages devoted to one antenna build/model - really good): http://www.w5ddl.org/files/Zs6bkw_vs_G5rv_20100221b.pdf I then looked at the W3DZZ and although its a bit longer than I want, it ticks all the other boxes. I also need to brew traps for 40m so the homebrew/learning aspect will be strong in this design of antenna as well. Two links below on how to build: W3dzz dipole: http://www.qsl.net/gm0onx/dipole.htm w3dzz dipole: http://www.rsars.org.uk/ELIBRARY/ANTENNAS%20DOCS/W3DZZ%20%20antenna%20-%20iss%201.3.pdf cheers, adonis |
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