[TowerTalk] Has anyone every put up a V-beam?

[Dan Maguire]

Duane wrote:
>>> Do you know if 4Nec2 files be imported into Eznec?

No.  But ...

For AutoEZ users, here is a V-Beam model I created a while ago.

http://ac6la.com/adhoc/V-Beam.weq

It is similar to the one that Paul posted on his QRZ page in that variables are used to control the leg length, apex height, and apex angle, so you can quickly configure it to your desired dimensions.  In addition, this one lets you control the height at the ends of the legs so you can make it a "sloping V-beam" if desired.  The model also includes an arbitrary length of parallel-conductor transmission line along with a 4:1 balun at the station end of the line so you can see what impedance your tuner would have to handle on various bands.

If you are not an AutoEZ user but you do have Microsoft Excel (not an Excel clone) you are welcome to use the free demo version of AutoEZ to convert the above .weq format model to .ez format.

AutoEZ info and demo download: http://ac6la.com/autoez.html

AutoEZ can also read 4nec2 files, so you could use it to read Paul's file and then convert that one to .ez format as well.  Note that .ez format does not support use of variables so when you convert .weq to .ez or convert .nec (4nec2) to .ez the model dimensions are "frozen" at whatever the current settings are in the original.

ARRL members who have access to back issues of QST might want to check out an article titled “A Four Wire Steerable V Beam for 10 through 40 meters” by Sam Moore, NX5Z, in the March 2011 QST.  The above model was built as I was reading that article.  Also, V-Beams are discussed in Chapter 13 of recent editions of the ARRL Antenna Book and the CD that is bundled with the book has three sample V-Beam models in .ez format.

Dan, AC6LA