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
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
"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
Another option, almost-but-not-quite free: http://on5au.be/Grayzone.html Dan, AC6LA _______________________________________________ _______________________________________________ TowerTalk mailing l
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
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:
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
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
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
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
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
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
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 ____
I apologize. My previous post was meant to go to the Topband reflector, not to Towertalk. Dan, AC6LA _______________________________________________ _______________________________________________ To
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
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
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
https://www.qsl.net/n7ws/Loaded_Antennas.pdf Dan, AC6LA _______________________________________________ _______________________________________________ TowerTalk mailing list TowerTalk@contesting.com
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
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