Build this Vertical Portable HF Antenna

The Asymmetrical Hatted Vertical Dipole (AHVD) prototype is an easy to build, portable alternative to other freestanding vertical HF antennas such as the Buddipole.

Asy Hat Vertical Dipole

Three views showing a how a planed vertical need not always be the classic 1/4 wave monopole.

We re-introduce the theory and origins of Cebik’s (W4RNL) Asymmetrical Hatted Vertical Dipole (AHVD) antenna with the hope to facilitate a vertical polarization portable 20-10m aerial for portable operations.

EFHW LNR Precision EF-10/20/40MKII Test Data

SWR Measurements of LNR Precision EF-10/20/40 End Fed Antenna

Basic tests of the LNR Precision EF-10/20/40 multi-band portable HF EFHW antenna including S11, SWR and a bandwidth check of the match box.

EFHW LNR Precision EF-10/20/40MKII Examination

The background and details of the LNR (Par Electronics) EF-10/20/40 end fed half-wave multi-band portable HF antenna. Come see what’s inside the mysterious “black box.”

Simulations of Classic & Broadband Hexbeam – The Movie

Many folks have successfully modeled all versions of the Hex Beam. Most of the simulation attempts use NEC programs.

Despite being a popular and productive way of simulating amateur radio antennas, another method of electromagnetic simulation makes use of the Finite-Difference Time Domain (FDTD) method.

Without going into too many details, the method divides up the simulation space into little cubes of volume. Then the next magnetic field values are derived from the current electric fields. Then the next electric field values are derived from the current magnetic fields. Repeat.

FDTD makes use of Maxwell’s equations to calculate the above fields. Being a Time Domain method, what follows shows a movie like display of what is happening in the antennas in super slow motion.

Read moreSimulations of Classic & Broadband Hexbeam – The Movie

Broadband Hexbeam at Field Day 2010

ARRL Field Day 2010 was a blast. A member of our club bagged a satellite contact within two minutes of start time. Wow. One new item to this year’s operation was a G3TXQ Broadband Hex Beam antenna with elements for 20, 15, 10 and 6 meters.

Read moreBroadband Hexbeam at Field Day 2010

5 HF Band Hex Beam on Six Meters

I am preparing for the Virginia QSO Party and want to add an alternative 20 meter solution for my 43 foot vertical plus get better 15 and 10 meter coverage; I have been working plenty of 15 meter contacts with the 43 foot vertical so I know that band is open. Plus you never know if the sunspots might give us some 10 meter fun too 😉

So…

I have been eagerly absorbing all there is to know about the hex beam style of HF antennas.

If you are the least bit interested in building or buying your own hex beam a must read web site is the G3TXQ study of the hex beam…

Read more5 HF Band Hex Beam on Six Meters

Hexagonal (Hex) Beam Battle

It seems the hexagonal beam has come of age as multiple manufacturers square off in an attempt to claim market share of the growing market for this style of antenna.

Ever since the 2009 QST article many folks, myself included, became aware of the simple elegance of the Hexagonal Beam (also known as Hexbeam generally and Hex-Beam® by Traffie Technology).

Read moreHexagonal (Hex) Beam Battle

BigIR vs. 43 Foot Vertical Antenna @ 10 meters EZNEC Shootout

In a previous post we promised to analyze the merits of the 43 foot tall tuner-required antenna vs. the adjustable BigIR vertical from SteppIR. We did and here are the results.

Read moreBigIR vs. 43 Foot Vertical Antenna @ 10 meters EZNEC Shootout