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Stack VHF 2 x 5 Elements
DELTA LOOP 144 MHz

HF and VHF Delta loop antennas

Horizontal stacked 2 x 5 elements VHF Delta loop antennas viewed under the tower

Condensator of VHF Delta loop antennas

Horizontal stacked 2 x 5 elements VHF Delta loop antennas other view

Details of updates

Informations

The heading concerning the antenna DELTA LOOP for band CB and Radio ham will be completely on line from here a few hours. The pages are in the course of checking. Part VHF will be available from here a few days. The pages are practically finished, but it remains to optimize some photographs. If this site has interested you, I would be grateful to you to mention it in bonds in your Web site or to inform your friends of it.

Carried out and on line
Under development
Pages to come

* Antenne HF bande CB et radioamateur
- Presentation
- The Boom
- The Plates
- The Elements
- The Capacitor
- Your Antenna
- Dimensions
- Diagrams
- Adjustments
- Councils

* Horizontal Stack VHF 2 x 5 Elements 144-146MHz

* Translation of the site :

Study, design and realization of a delta loop antenna.

Your DELTA LOOP Antenna

At the end of these some lines, you will be able to determine which must be the optimal dimensions of your antenna. Although the results obtained make it possible to have excellent results in term of performances of the antenna, nothing you empeche to test thereafter by varying the spacings as well as the lengths of the triangles. Recall that nothing is worth the experimentation.
However a good software of modeling of antenna will help you considerably in this task.
But let us pass without more waiting the part which interests us, namely dimensions of a 5 elements DELTA LOOP antenna calculated on the frequency of your choice.

* * * * * * * *

Dimensions of a 5 elements DELTA LOOP antenna
for a frequency of 27.555 MHz :

* * * * * * * *

The wavelength

The corresponding wavelength "lambda" is : 10.879784358556 meters.

so approximatly L = 10.88 m

Spacings

Different possible spacings that you can use are :

0.25 L = 2.72 m - 0.20 L = 2.176 m - 0.17 L = 1.85 m
0.15 L = 1.632 m - 0.13 L = 1.414 m - 0.10 L = 1.088 m

My personal experiment enabled me to obtain excellent results with the following
combination on the basis of the reflector : 0.17 L, 0.15 L, 0.13 L, 0.10 L I thus advise you this combination.

what gives for your frequency and always on the basis of the reflector :

|-REF---------------|-RAD-------------|-D1-----------|-D2--------| D3

|-------1.85 m ------| ------1.632 m ---|--- 1.414 m ---|-- 1.088 m --|

The triangle radiator (RAD)

Each triangle being equilateral, the three sides thus have even length.
The work frequency determines dimensions of the triangle radiator.

For your frequency, each of the three with dimensions ones will make : 3.627 m.
The copper wire constituting the superior part of the delta will be only one length (3.627 m.)
The two other sides will be carried out in two parts. One length fixes of 3.00 m,
constituted by the tube with a 20 mm diameter and the remainder out of tube with a 16 mm diameter .
(see heading "Elements" of the site).

|______________ 3.00 m ________________|___ 0.627 m __|

This principle will be used for the other elements of the antenna.

Dimensions of all the elements

We will use a proportional factor of 3%.

Réflecteur -> Overall length of the triangle :11.206 m then 3 sides of 3.736 m.

|---------------------- 3.00 m ----------------------|---- 0.736 m ----|

Radiateur -> Overall length of the triangle : 10.88 m then 3 sides of 3.627 m.

|---------------------- 3.00 m ----------------------|---- 0.627 m ----|

Directeur 1 -> Overall length of the triangle : 10.554 m then 3 sides of 3.518 m.

|---------------------- 3.00 m ----------------------|---- 0.518 m ----|

Directeur 2 -> Overall length of the triangle : 10.237 m then 3 sides of 3.412 m.

|---------------------- 3.00 m ----------------------|---- 0.412 m ----|

Directeur 3 -> Overall length of the triangle : 9.93 m then 3 sides of 3.31 m.

|---------------------- 3.00 m ----------------------|---- 0.31 m ----|

Caution! Envisage for the tubes with a 16 mm diameter constituting the two high ends of the triangle,
of a sufficient length inside the tube of 20 mm diameter Between 100 and 250 mm for example.

Simplified shematic sight of your 5 elements antenna

0.736 m

0.627 m

0.518 m

0.412 m

0.31 m

1.85 m ------------------

1.632 m ------------------------------

1.414 m -----------------------------------------

1.088 m -------------------------------------------------

10 tubes with a 20 mm diameter and 3.00 m length pour 27.555 MHz

This worksheet is designed to give the dimensions of a directing antenna being intended to work on frequencies ranging between 26 and 30 MHz, however, other worksheets targeted for other frequency bands will be put on line soon.
For example on 14 MHz, or VHF waves, 50 MHz, 144-146 MHz and still more!

Note : You will be able to find suppliers of tubes and shaped aluminium, coliers of tightening, screws and bolts STAINLESS or steel, aluminium or copper, steel wire rope by consulting the internet.
It is significant before choosing materials for the realization of your antenna to take account of all the environementaux factors well. Indeed, if your antenna is intended to remain with deumeure and even if it will not be used that within the framework of a specific activity (contest, activity DX, IOTA, etc), your realization will have to provide its function under sometimes severe conditions.

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Conception et Réalisation O.M CONCEPT. Copyright © 2005 Reproduction interdite.