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- เผยแพร่เมื่อ 9 ต.ค. 2024
- Thank you to Marty, K0IN for his email question. Let's look at whether a short base loaded vertical or a full quarter wave inverted L would best suit his 80m operating.
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Thanks so much Tim! This is indeed answering my question! I do mostly digital and cw, but can get to phone with a tuner, which is perfectly acceptable. I just got a DX Commander Signature 9, and I'm thinking now to use the radial field, but do an inverted L facing east (Hawaii is due west from me, 4000 miles/6400 km). This comparison illustrates to me the trade off between efficiency and take off angle. For my use case, I think efficiency wins - enough take off angle from the vertical element to ensure some decent DX. Thanks again, Tim!
Marty I’m glad it helped and thank you for the initial query! 73
Sorry Marti, forgot to say, put a 40m trap top of your vertical ,you get 80/40 ant. 73 zl3xdj
Is better on dx vertical? Best 73
Nice video Tim, in reality I did this ant test on the air. 1/4 wave is best of course, base loaded I tried was absolutely rubbish for dx, 10,000 miles plus.
I found have many weeks of testing, a inverted L , my 7m vertical section and the rest horizontal or slightly sloping down worked zl to uk every evening. The L has slightly less noise than the vertical. Hope this helps your mate. 73 zl3xdj.
More wire = more fire, and more wire with more "fire in the wire" = bigger signal. Well done Tim!
Totally!
This is good to know, especially the radiation pattern. I'm interested in something for 160m portable. Obviously, whatever I do will be a compromise, but i'll keep an inverted-L quarter-wave in mind.
Good thinking!
My first antenna is Inverted L. Hasn't been going brilliantly tbh. Fibre glass pole at the end of short garden with wire going up and sloping down to top of house drainpipe. I decided that maybe this wasn't desirable so raised telescopic pole higher and the horizonal section shortened - further from house. Living in Kent, all I pick up is French stations now! Useful to know that the slope is basically in the wrong direction. Just need to work out what to do about it now.. Thanks Tim.
Thank you!
Well explained tim 👏 would love to see a comparrison of a cobweb antenna at 30ft compared to a hustler 5btv ground mounted on 20-10m as my cobweb seems to smash the vertical on nvis and dx.........never seen the 2 modelled against each other
Tim, I have a DX Commander Signature 12.4 with a shortened 80m vertical, 22.5m element with an approx 95 turn coil at 7.5m. There is also a linear loaded portion at the top for the excess wire. The 2:1 bandwidth is about 103KHz, with the best SWR of 1.04 @ 3.618MHz. Would an Inverted L provide more bandwidth?
My hunch is yes as it will be a full sized antenna
Great Video Tim! Mark 2E0MSR
Thanks mark 73
Ah, 80m my nemesis. We meet again.
Ah ha!