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Total 87 documents matching your query.

21. [TowerTalk] Modeling the 80m DX special dipole (score: 1)
Author: Dan Maguire <danac6la@gmail.com>
Date: Fri, 14 Sep 2018 02:35:27 -0700
Using AutoEZ I took a shot at modeling the 80m DX Special as described by AI1H back in 1989. See Frank Witt, AI1H, "The Coaxial Resonator Match and the Broadband Dipole", QST, April 1989, and "The Co
/archives//html/Towertalk/2018-09/msg00038.html (11,395 bytes)

22. [TowerTalk] Broadbanding 80m Dipoles, Monopoles, and Loops (score: 1)
Author: Dan Maguire <danac6la@gmail.com>
Date: Fri, 12 Oct 2018 02:20:47 -0700
Here is a follow-up to the question posed a month ago by Guido, IK2BCP, concerning the 80m DX special dipole: https://forums.qrz.com/index.php?threads/broadbanding-80m-dipoles-monopoles-and-loops.630
/archives//html/Towertalk/2018-10/msg00088.html (6,910 bytes)

23. [TowerTalk] G3TXQ, SK (score: 1)
Author: Dan Maguire <danac6la@gmail.com>
Date: Tue, 1 Jan 2019 09:27:56 -0800
"Sunday 30th: Steve passed away peacefully in his sleep last night." Steve Hunt was a true technical giant. He will be missed. Of interest to those many folks who are familiar with Steve's work on c
/archives//html/Towertalk/2019-01/msg00001.html (7,174 bytes)

24. Re: [TowerTalk] Another off-topic request (score: 1)
Author: Dan Maguire <danac6la@gmail.com>
Date: Thu, 28 Mar 2019 03:18:01 -0700
Another option, almost-but-not-quite free: http://on5au.be/Grayzone.html Dan, AC6LA _______________________________________________ _______________________________________________ TowerTalk mailing l
/archives//html/Towertalk/2019-03/msg00333.html (7,239 bytes)

25. Re: [TowerTalk] MODEL FOR TOWER (score: 1)
Author: Dan Maguire <danac6la@gmail.com>
Date: Tue, 23 Apr 2019 15:37:34 -0700
Perhaps here: https://en.wikipedia.org/wiki/Antenna_equivalent_radius As a comparison, the lower-right of this image shows both the Leeson and Wikipedia equivalent diameter for a Rohn 25G cross secti
/archives//html/Towertalk/2019-04/msg00179.html (7,644 bytes)

26. Re: [TowerTalk] NEC rotate wire (score: 1)
Author: Dan Maguire <danac6la@gmail.com>
Date: Tue, 9 Jul 2019 15:31:33 -0700
Here's a nice explanation (first answer) of how to transpose x/y coordinates by counterclockwise rotation angle theta, where the center of rotation can be any arbitrary point in the x/y plane: https:
/archives//html/Towertalk/2019-07/msg00141.html (7,980 bytes)

27. [TowerTalk] AutoEZ can now read Yagi Optimizer files (score: 1)
Author: Dan Maguire <danac6la@gmail.com>
Date: Thu, 25 Jul 2019 22:34:27 -0700
AutoEZ maintenance update v. 2.0.25 is now available. One of the new features in this update is the ability to read files created by the DXE Yagi Mechanical, the K7NV Yagi Stress, the K6STI Yagi Opti
/archives//html/Towertalk/2019-07/msg00370.html (7,992 bytes)

28. Re: [TowerTalk] Open wire measurments (score: 1)
Author: Dan Maguire <danac6la@gmail.com>
Date: Tue, 3 Sep 2019 17:54:19 -0700
Many years ago Wes alerted me to a method of determining transmission line characteristics that uses two load impedances other than open and short. For example, when measuring 50-ohm coax the loads m
/archives//html/Towertalk/2019-09/msg00055.html (7,712 bytes)

29. [TowerTalk] Lunar Dipole (score: 1)
Author: Dan Maguire <danac6la@gmail.com>
Date: Sat, 4 Jan 2020 22:56:34 -0800
Well golly, doing the calculations for a low dipole on the surface of the moon sounds like it's just too much fun to pass up. Here's an animation of the elevation patterns from 0.011 to 0.015 MHz wit
/archives//html/Towertalk/2020-01/msg00074.html (7,792 bytes)

30. Re: [TowerTalk] Need help estimating cable length of DXE 400 MAX (score: 1)
Author: Dan Maguire <danac6la@gmail.com>
Date: Sun, 12 Jan 2020 15:25:03 -0800
For an illustrated example of determining line length along with frequency-dependent VF see section "Line Length via Quarter or Half-Wave Points" (about half-way down the page) here: https://ac6la.co
/archives//html/Towertalk/2020-01/msg00174.html (9,557 bytes)

31. [TowerTalk] New EZNEC maintenance update available (score: 1)
Author: Dan Maguire <danac6la@gmail.com>
Date: Sat, 25 Jan 2020 07:50:10 -0800
For EZNEC v6 users, maintenance update v. 6.0.23 (18 Jan 2020) is now available. Download from here ( http://eznec.com/ez60updates/index.html ), details on what's new here ( http://eznec.com/Updates6
/archives//html/Towertalk/2020-01/msg00214.html (7,128 bytes)

32. Re: [TowerTalk] Fan Dipole (score: 1)
Author: Dan Maguire <danac6la@gmail.com>
Date: Mon, 17 Feb 2020 21:51:17 -0800
That's called a "Coupled-Resonator" dipole. For details on modeling something like that see: https://ac6la.com/aecollection4.html#15b Dan, AC6LA I added a #14 THHN wire spaced 12" above my 40 meter r
/archives//html/Towertalk/2020-02/msg00094.html (8,156 bytes)

33. Re: [TowerTalk] Topband: Ground Conductivity (score: 1)
Author: Dan Maguire <danac6la@gmail.com>
Date: Mon, 23 Mar 2020 22:05:34 -0700
Turns out that very subject was being kicked around on a recent qrz.com thread: https://forums.qrz.com/index.php?threads/indirect-measurement-of-ground-constants-with-a-dipole.696955/ Dan, AC6LA ____
/archives//html/Towertalk/2020-03/msg00082.html (7,504 bytes)

34. Re: [TowerTalk] Topband: Ground Conductivity (score: 1)
Author: Dan Maguire <danac6la@gmail.com>
Date: Mon, 23 Mar 2020 22:15:45 -0700
I apologize. My previous post was meant to go to the Topband reflector, not to Towertalk. Dan, AC6LA _______________________________________________ _______________________________________________ To
/archives//html/Towertalk/2020-03/msg00083.html (6,644 bytes)

35. [TowerTalk] Who says Smith charts are boring? (score: 1)
Author: Dan Maguire <danac6la@gmail.com>
Date: Tue, 31 Mar 2020 22:47:51 -0700
Ward Harriman, AE6TY, the creator of SimSmith ( http://www.ae6ty.com/Smith_Charts.html ), is stuck inside like many of us. He decided to spend a bit of his free time creating this: https://i.imgur.co
/archives//html/Towertalk/2020-04/msg00000.html (6,557 bytes)

36. [TowerTalk] New EZNEC updates available for both v. 6.0 and v. 5.0 (score: 1)
Author: Dan Maguire <danac6la@gmail.com>
Date: Mon, 6 Apr 2020 14:24:26 -0700
For EZNEC v. 6.0 users, maintenance update v. 6.0.25 (4 April 2020) is now available. See http://eznec.com/Updates60.html and http://eznec.com/ez60updates/index.html == For EZNEC v. 5.0 users, mainte
/archives//html/Towertalk/2020-04/msg00041.html (8,209 bytes)

37. Re: [TowerTalk] Measuring resonance of a yagi element (score: 1)
Author: Dan Maguire <danac6la@gmail.com>
Date: Thu, 23 Apr 2020 23:24:51 -0700
See http://www.arrl.org/antenna-modeling-files although the TH5DX is not listed. AutoEZ can read .yag files, see https://ac6la.com/aeadvanced.html#Part9a AutoEZ general information: https://ac6la.com
/archives//html/Towertalk/2020-04/msg00185.html (8,808 bytes)

38. Re: [TowerTalk] 40m 4el KLM - replacing linear loading with coils (score: 1)
Author: Dan Maguire <danac6la@gmail.com>
Date: Wed, 29 Apr 2020 00:00:14 -0700
https://www.qsl.net/n7ws/Loaded_Antennas.pdf Dan, AC6LA _______________________________________________ _______________________________________________ TowerTalk mailing list TowerTalk@contesting.com
/archives//html/Towertalk/2020-04/msg00228.html (9,136 bytes)

39. Re: [TowerTalk] 40m 4el KLM - replacing linear loading with coils (score: 1)
Author: Dan Maguire <danac6la@gmail.com>
Date: Wed, 29 Apr 2020 15:09:06 -0700
Here are the four AO (.ant) models described on the above page converted to AutoEZ (.weq) format, with the AO variable names used in Brian's models converted to AutoEZ variables: https://ac6la.com/ad
/archives//html/Towertalk/2020-04/msg00239.html (9,696 bytes)

40. Re: [TowerTalk] ez nec help (score: 1)
Author: Dan Maguire <danac6la@gmail.com>
Date: Sun, 3 May 2020 12:09:41 -0700
You might try opening EZNEC sample model 20M5ELYA.ez. That's a typical 5-element 20m beam with stepped diameter tubing. (EZNEC uses "stepped diameter" for telescoping aluminum tubes because "tapered
/archives//html/Towertalk/2020-05/msg00006.html (7,508 bytes)


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