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References: [ +subject:/^(?:^\s*(re|sv|fwd|fw)[\[\]\d]*[:>-]+\s*)*\[TowerTalk\]\s+40\s+meter\s+dipole\s*$/: 14 ]

Total 14 documents matching your query.

1. Re: [TowerTalk] 40 meter dipole (score: 1)
Author: "James Wolf" <jbwolf@comcast.net>
Date: Tue, 14 Aug 2018 16:50:50 -0400
Terry, 30 years ago, I put up two 2 meter 16 element antennas on a long boom. They are supposed to be self-supporting, but sometimes, not so much. I used a thimble like this https://www.lexcocable.co
/archives//html/Towertalk/2018-08/msg00095.html (8,072 bytes)

2. [TowerTalk] 40 meter dipole (score: 1)
Author: Steve <sflory@mindspring.com>
Date: Sun, 01 Oct 2023 23:33:11 +0000
is it better to build our buy a 40 meter rotatable dipole? any good kits? what is the best facotory made Steve Flory W9KOP sflory@mindspring.com "I like climbing towers because people look up to me"
/archives//html/Towertalk/2023-10/msg00000.html (6,411 bytes)

3. Re: [TowerTalk] 40 meter dipole (score: 1)
Author: Gene Smar via TowerTalk <towertalk@contesting.com>
Date: Mon, 2 Oct 2023 00:17:27 +0000 (UTC)
Steve: I've had a Cushcraft D40 atop my tower and mast at 78 feet since 2001. It was actually enjoyable to build. Turning radius is 21 feet. SWR curve is smooth like in the assembly manual (I set my
/archives//html/Towertalk/2023-10/msg00002.html (8,210 bytes)

4. Re: [TowerTalk] 40 meter dipole (score: 1)
Author: "J. Hunt via TowerTalk" <towertalk@contesting.com>
Date: Mon, 2 Oct 2023 02:37:36 +0000 (UTC)
The ultimate in 40 meter rotatable dipole is the OptiBeam  OB1-40.  SWR issues - minimal.   https://www.optibeam.net/index.php?article_id=103&clang=1 Yes I have one! Thanks n 73,JamesKI5DQ On Sunday,
/archives//html/Towertalk/2023-10/msg00008.html (9,260 bytes)

5. Re: [TowerTalk] 40 meter dipole (score: 1)
Author: <john@kk9a.com>
Date: Mon, 2 Oct 2023 00:00:34 -0400
That depends on if you want a full size dipole or a shortened one. It also depends on your fabrication skills and available equipment and free time. It may also depend on how much aluminum tubing you
/archives//html/Towertalk/2023-10/msg00010.html (7,310 bytes)

6. Re: [TowerTalk] 40 meter dipole (score: 1)
Author: "J. Hunt via TowerTalk" <towertalk@contesting.com>
Date: Mon, 2 Oct 2023 10:59:29 +0000 (UTC)
The performance of an antenna will depend on the overall element size (length).  Shorter elements will have a narrower usable SWR bandwidth.  Thanks n 73,James On Sunday, October 1, 2023 at 11:00:47
/archives//html/Towertalk/2023-10/msg00011.html (8,594 bytes)

7. [TowerTalk] 40 meter dipole (score: 1)
Author: "jim.thom jim.thom@telus.net" <jim.thom@telus.net>
Date: Mon, 2 Oct 2023 09:20:59 -0700
<The performance of an antenna will depend on the overall element size (length).? <Shorter elements will have a narrower usable SWR bandwidth.? <That depends on if you want a full size dipole or a sh
/archives//html/Towertalk/2023-10/msg00012.html (8,796 bytes)

8. Re: [TowerTalk] 40 meter dipole (score: 1)
Author: Jim Brown <jim@audiosystemsgroup.com>
Date: Mon, 2 Oct 2023 09:57:28 -0700
That "balun" is really a lousy common mode choke. A far better thing to use there is a really good common mode choke using these guidelines. http://k9yc.com/2018Cookbook.pdf The pattern of a dipole i
/archives//html/Towertalk/2023-10/msg00013.html (9,427 bytes)

9. Re: [TowerTalk] 40 meter dipole (score: 1)
Author: Jim Brown <jim@audiosystemsgroup.com>
Date: Mon, 2 Oct 2023 10:06:09 -0700
Yes, but extensive modeling shows that SWR bandwidth is the only important downside of loading that is not inductors at the feedpoint. SWR is NOT a measure of antenna performance, and the added loss
/archives//html/Towertalk/2023-10/msg00014.html (9,037 bytes)

10. Re: [TowerTalk] 40 meter dipole (score: 1)
Author: Steve Babcock <ve6wz@shaw.ca>
Date: Mon, 2 Oct 2023 11:19:52 -0600
Indeed SWR is not a measure of Yagi antenna performance. However Yagi performance IS a function of the narrow bandwidth of a shortened PARASITIC element. (not the driver) Explained here regarding a 2
/archives//html/Towertalk/2023-10/msg00015.html (8,759 bytes)

11. Re: [TowerTalk] 40 meter dipole (score: 1)
Author: Jim Brown <jim@audiosystemsgroup.com>
Date: Mon, 2 Oct 2023 11:02:07 -0700
No debate on that, but I'm specifically talking about dipoles. Higher frequency bands in fan dipoles also exhibit reduced SWR bandwidth, as low frequency bands in multi-band loaded dipoles (like the
/archives//html/Towertalk/2023-10/msg00016.html (9,617 bytes)

12. Re: [TowerTalk] 40 meter dipole (score: 1)
Author: Gary NA6O via TowerTalk <towertalk@contesting.com>
Date: Mon, 2 Oct 2023 11:27:07 -0700
JK401, definitely. Its a proper 100 MPH design with no stays needed, USA materials, USA support and a very nice manual. I have to be pretty desperate to buy an antenna from anyone else these days. I
/archives//html/Towertalk/2023-10/msg00017.html (8,823 bytes)

13. Re: [TowerTalk] 40 meter dipole (score: 1)
Author: <john@kk9a.com>
Date: Mon, 2 Oct 2023 17:42:24 -0400
I agree that loaded center fed 40m rotatable dipole is an effective antenna , even on portions of the band where the SWR is higher. On 80m many people use a 1 WL section of 50 ohm coax following by a
/archives//html/Towertalk/2023-10/msg00018.html (8,569 bytes)

14. Re: [TowerTalk] 40 meter dipole (score: 1)
Author: Leeson <leeson@earthlink.net>
Date: Mon, 2 Oct 2023 15:27:05 -0700
Yep, it works as you suggest, have used it here and in HC8. Because the 40m band is a narrower percentage width, it takes only a half-wavelength 50-ohm line, plus the quarter-wave transformer, to cov
/archives//html/Towertalk/2023-10/msg00019.html (9,436 bytes)

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