OR USE THESE FORMULAS:
one leg = 630/freq mhz = ft
ladder line = 135/freq mhz = ft

Here is the basic "theory":

The TriDouble dipole has two elements of 3/4 wavelength each.
It has resonance at the design freq but the impedance is high (500 Ohm) and the reactance/inductance value changes greatly when you change frequency.

To compensate for this you shorten the element length a bit and add open wire, 400-600 Ohm (not critical). This will decrease impedance to 200 Ohm at the design frequency.
This is why I use a 4:1 Current balun (must be a current balun).
This is the Extended Double Zepp, EDZ design parameters:

Length of each element: 0.64 x l
Minimum length of ladder wire: 0.137 x l

Now the great side effect is, that the antenna will work as good as, or
better than a dipole at any frequency higher than the frequency that match a 1/4 wavelength at one of the elements.
Now using an open wire feeder, it will also work at the lowest freq and up, corresponding to a 1/4 wavelength, when you add the element length to the wire length. But now of course, gain will decrease because the ladder wire will be a part of the antenna.
Now the EDZ will be easily matched with a remote ATU that can handle rapidly changing reactance/inductance values. A remote ATU that can handle swr of 1:10 will do the work easily.

Back to the V-beam design:
The EDZ-V-beam with design freq at 51.110 MHZ will work with very high forward gain at the design freq, and as a normal "KB4XJ" V-beam at the 15 meter band (look at the element length).
Using open wire feed, minimum 4 ft (longer is Ok, but remember it is a part of the antenna at frequencies under 21 MHz), will give an easy match from 14 MHz and up.

Conclusion: The trick is to use open wire, a 4:1 balun and a Remote ATU like the LDG RT11 TUNER connected directly to the balun.


Vy 73, Peter
LA0HV

THE LATEST INFORMATION

Emails RECEIVED AS OF (11-12-02 ) from Peter LA0HV and Darrell KB4XJ

Hi Darrell & Don.

I just finished the last experiment of the year. It's snowing heavily now in Norway, 1 ft per hour! Minus 10 deg Celsius .... Brrrr

Last experiment revealed something very interesting about the current in the elements of the V-Beam:

I made the KB4XJ 15m V-Beam design using thin wire, same length and angle.
This happened: Field strength measurement now showed a major back loop and a decrease of forward gain (almost no front to back). You can say that the Beam effect almost disappeared.
I then took 1.25" kopper (copper) tubes, same length and angle, and all of a sudden I got a V-beam again. Back loop gone, forward gain increased to almost 6 dB !!!!!!!!!!

So .. conclusions from a freezing cold, windy Norwegian Hill-top is:

A "fat" element is turning the design from a resonant V-wire antenna into a Aperiodic (stable current) element V-Beam. The thick elements are doing the same job as a terminator in a Rhombic design . WOOOW !!!!!

Freezing smiles from LA0HV.

Vy 73 Peter



From: Darrell & Kay Koranda [mailto:kb4xj at strato.net]
Sent: 9. November 2002 01:16
To: Peter Grun
Re: Developing a 6 band Single element horizontal V Beam


Hi Peter,
The Field Strength Meter and getting readings.
I checked across the back side of the V beam and showed a field strength reading of a .1. At the sides of the front ends power rose .5 and just inside the ends power rose to a 1. In the near center power rose 2. and in the dead center it was a 3. In just the field strength reading I was figuring around 28 db difference between front to back. In the tests I made I was using 10 watts of power. The antenna performed very good 2 years ago when I first truly tested it on field day 2001. Field day 2002 was not as good, problems with generator, blowing rain. Anyway back to the Horizontal V, in my early study on long wire antennas it was noted that power was related to one wire and that when a wire had a twin, the power doubled. Further study of log periodic dipoles (when a log dipole is bent forward it will have an added gain of 2.5 db., it was also found the beginning horizontal V was a 1/4 wave. Now in my experience I found that induction between the elements changes the resonant frequency and lowers the frequency of a dipole and as a result you have to add 2 inches per side to make up for the induction factor. In your 90 degrees configuration, the higher you go in frequency the broader the front lobe should be, in that a horizontal V at 90 degrees at 1/4 wave on design, at longer wavelengths the V angle can be narrowed down, but the antenna does work and I wonder why it was never truly correctly reported, not having the works of Dr John Klause at hand. I spent 4 months researching the horizontal V antenna, and I spent over a month refining the center mount and have the antenna and mount down to a lean 7 pounds! Darrell KB4XJ


----- Original Message -----
From: Peter Grun
To: 'Darrell & Kay Koranda'
Sent: Friday, November 08, 2002 9:51 AM
Subject: SV: Developing a 6 band Single element horizontal V Beam


Hi Darrell.

The pointing right up idea of yours is also great. I once did that experiment with a 2 element for 80 meter. For a long time I irritated me that the G5RV did not perform well. I found out that when you are using an Inverted V type antenna over a sandy or rocky soil, it does not work. (I live on a rocky hill). The ground is absorbing the E-field. The reason why the Inverted v type antennas like the G5RV works for most people, I think, is because the Earth with a good ground-mirror soil works as a Fire Back reflector.
So I took a 80meter dipole and mounted a reflector between the dipole and ground, the "beam" pointing directly in thy sky. The effect was tremendous! Within a 1000 miles range nobody understood how my signal could "hit" them with such an extreme powerful strength. It was a 80 meter contest winner antenna. I think that it also is a good DX antenna, the only problem is that stations within 1000 miles is "bending" your S-meter, so you really need extremely strong filters to be able to work in the DX-window.
Back to your V-beam: I don't understand how it is possible to actually get a good FB-ratio on the V-beam. I did some field strength readings and I am still surprised!!! It's so cool! Now talking about "cool" winter is closing in on me here in Norway so I have to wait until April for more experiments.
Haven't got any RTTY at the moment, but will get some equipment during the winter, I will look for you on 15 then.

Vy 73 de LA0HV, Peter


-----Opprinnelig melding-----
Fra: Darrell & Kay Koranda [mailto:kb4xj at strato.net]
Sendt: 7. November 2002 13:02
Till: Peter Grun
Emne: Re: Developing a 6 band Single element horizontal V Beam


Hi Peter, Did you do any Field Strength readings yet? That is what shocked me with the original design of the horizontal V design on 15 meters. The very high increase in forward field strength in the antenna and the decrease to the rear, could hear 360 degrees but could see a noticeable increase on the S-Meter when you rotated to the right direction. It's really nice that the antenna can be rotated with a cheap TV rotator, I'll have to try your modified version. I was thinking of trying another experiment but haven't had the time to do it yet, I was thinking of pointing the V straight up and using the sky to bounce off of or launching at a 30 or 40 degree and up, of the two experiments I think the second may be of a better. In the first your pulling the signal straight down out of the sky and shooting them back up and scattering. In the second your pulling signals down in a direction and shooting back in the same direction. The first pointed up has the advantage of making your antenna appear to be say; 75 miles up with nearly omni coverage. The second pointed off with a 30 or 40 degree rise should provide longer distance. This is what I think will happen, the extended double zepp is basically a 3/4 wave antenna shorted to 5/8 wave with a 1/8 wave of ladder line, I have one but haven't tried it in the V configuration yet. I have time constraints and have to go off and work. If you operate rtty, (I operate around 21.278 MHz), my current project is connecting my new radio, a Patcom PC 9000, to my Pakrat 232 TNC and then to an old laptop for some portable rtty with the One Element Beam with Solar Power. Have yet to get the charge controller for the solar panel. I am using a string of silicon diodes to drop the voltage to 13.8 volts DC. Got to go, good by for now, hope we can exchange information later. Darrell KB4XJ 73's



EMAIL
DARRELL
KB4XJ

EMAIL
PETER
LA0HV


EDITORS NOTE from N4UJW:
"In the true spirit of Amateur Radio, Peter saw the original plans for the ONE ELEMENT BEAM on this site and saw that an improvement could be made to this fine design which you have just seen AND HAS SHARED IT WITH ALL OF US!
EXPERIMENT! EXPERIMENT!........ 73 N4UJW

Peter Grun LA0HV
Svinndalveien 96
Skiptvet, 1816
NORWAY
License Class: A

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