W8jk Antenna Design

Warning about antenna models. VK2ABQ may have been the first to publish a design with his square antenna.


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This design will provide you some flexibility.

W8jk antenna design. If you have more space since. The W8JK antenna design is a clever beast. W8JK Antennas Book -1950.

Some of the characteristics are as follows. Elements were folded toward each other at about the 50 point 14 wave spacing required. W8JK by ZR6TXA The W8JK is a famous and effective DX antenna The W8JK Introduction The W8JK is a famous and effective DX antenna first built by John Kraus W8JK in 1937After seeing a paper by George H Brown with theoretical calculations about the performance of closely-spaced dipoles Kraus built the first W8JK beam antenna with two parallel dipoles driven with opposite.

When fed in the center the antenna produces a bi-directional pattern. W8JKMOXON antenna Variant. I found in a French magazine MEGAHERTZ N96 Feb 1991 F9HJ p91-95 an original article about the W8JK.

It uses the broadside doublet lengths for the highest frequencyalong with a total phase-line length that is 12 of the element length L. To view a few of my antennas and station look at MY STATION. Read the article An extended double Zepp Antenna.

In this post ZR6TXA takes us step-by-step through the design construction and use of this simple effective beam antenna. This link is listed in our web site directory since Friday Dec 19 2008 and till today W8JK Home Made antenna has been followed for a. A dipole does NOT have 22 dB gain over an isotropic radiator when the dipole is placed over earth.

Ronald Wyeth Percival King 1905-2006. Reprinted from the Radio Handbook 21 edition page 28-16 10 Amateur Radio December 2004. The main category is Ham radio directional Yagi antennas that is about Yagi Antennas for ham radio use manufacturers plans and design.

Also see Rhombic Antenna page Three towers support two 2-bay wide 4-bay high 5 band curtains at Radio New Zealand International. Manage to contact Thailand only 45watts with -7db signal. Stumbled across it while modeling the antenna and subsequently only saw it mentioned in Les Moxons book.

This antenna is design on the same basis but instead of folded wires to the center pole of the boom this design is relying on the MOXON one. Properly designed the W8JK can cover 20 meters through 10 meters with elements only 73 meters2394 ft long. Developed by John Kraus W8JK in the1930s the antenna has undergone many variations.

Student Preparation and Materials Required. The W8JK is a famous and effective DX antenna first built by John Kraus W8JK in 1937. Simply stated the W8JK antenna consists of 2 closely-spaced parallel dipoles driven with opposite phase.

The two dipole elements need a pair of anti-phase signals equal in magnitude. K3CR Contest Station at Penn State. Request PDF Design of Anti-Phase Feeding Network for W8JK Array Based on In-Phase Power Divider Double-dipole antennas driven by anti-phase.

Along with the EDZ the bi-square and W8JK designs are reviewed and the alignment of currents will be related to the resulting patterns. K3CR Contest Station at Penn State. Both the doublets are driven elements but unlike the Lazy-H where they were driven in phase in the case of the W8JK the two Doublets are driven out of phase with 180 phase difference at the feed-points.

The antenna may be made directional by attaching the feed to one of the dipolesThe pattern will be directed. The conversion to a Moxon ZL SPECIAL or a Maria-Maluca will be easy also. Beam design is always a struggle to optimize forward gain FB and.

Developed by John Kraus W8JK in the 1930s the antenna has undergone many variations. The W8JK antenna First published in the late 1930s an article on end-fire antenna arrays by Dr John Kraus in the USA presented. It was an interesting design in the sense.

Kraus W8JK in 1937 it uses two dipoles both driven and out of phase with each other to create a directional antenna no front to back ratio though that works on six bands 20-17-15-12-10-6 meters and as a top loaded vertical on 40 meters with a counterpoise ground. The versions shown here is designed for a 31 frequency range. In this communication an.

Brown entitled Directional Antennas John developed for the 20-meter wavelength band a flat-top beam antenna later to be called the 8JK beam or W8JK beam antenna. It uses the broadside doublet lengths for the highest frequency along with a total phase-line length that is 12 of the element length L. In 1937 after reading an article by George H.

The versions shown here is designed for a 31 frequency range. FOLDED W8JK build step by step Final build. Ham Radio Contesting.

Lazy H Antenna Bi-Square Sterba Curtain HR HRS and USIA Curtain and Bruce Array Antenna Arrays. After my 4 elements periodic logarithmic beam has been destroyed I was again looking for a directive antenna with a simple design that could allow a coverage of all bands from 20 to 10 m. The performance characteristics are absolutely outstanding.

It is a compact 6-band antenna only 73m long and covering the 20 17 15 12 10. Antenna Optimization Adding an optimizer to an antenna modeling program allows the computer to design the antenna with the designers. These two 300 foot tall towers will support my new distributed feed curtain array for 80 and 40 meters.

Several designs emerged in the 1970s for reduced size beam antennas implemented by folding the elements. The good thing regarding my design is you can convert the folded antenna to a full size W8JK antenna with ease. It covers 5 bands 10-12-15-17-20m.

The beam design I will describe was given by Kraus in QST magazine in June 1982. The W8JK antenna is a classical antenna in our series of HS4 Legendary Multiband Wire Antennas. Fig 18 – W8JK array design data.

The W8JK antenna looks rather similar to a 2-element Yagi but both the elements of the W8JK antenna are equal in length and closely spaced. Double-dipole antennas driven by anti-phase signals W8JK array are often used to achieve broadband and good unidirectional radiation patterns. The antenna may be made directional by attaching the feed to one of the dipolesThe pattern will be directed.

End fed longwire or random wire antenna. The W8JK array The W8JK array designed by John Krause sk is also close spaced. The antenna consists of two symmetrical length horizontal radiating elements being.

When fed in the center the antenna produces a bi-directional pattern. Unlike typical antennas this is a non-resonant center-fed antenna. Kraus Sent Me His 2nd Edition.

This design is a variant of the Open-Folded W8JK. However realization of anti-phase signals with equal magnitude for the W8JK array is difficult in a planar structure. The dipole is the basic building block of many antennas.

Similar antennas have been around since the 1930s.


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