Construction...

  • Boom size

    All featured designs require 1 Inch (25.4mm) square section aluminium...
  • Element size

    Parasitic elements and DE require 1/2 Inch (12.7mm) diameter tube.
  • Measuring

    Lay out boom, mark position of reflector element, measure all other element positions from this point.

    Aim for the nearest mm!
  • Tolerances

    Measure and cut the parasitic elements to the nearest mm. However, it is better to cut them 1mm too short than 1mm too long. Reason: Yagis have a frequency response similar to a Low Pass Filter so it is very important to keep the cut off frequency out of and above the pass band.
  • Element Mounting

    ALL DIMENSIONS ARE FREE-SPACE

    ELEMENTS NEED TO BE INSULATED FROM AND RAISED SUFFICIENTLY HIGH ABOVE THE BOOM TO AVOID BOOM CORRECTION AS PER DL6WU MOUNTING DIRECTIVE! I.E. RAISED MORE THAN THE BOOM RADIUS (r) ABOVE THE BOOM...

    No boom correction is required if you follow this advice!
  • Element lengths

    Double the element lengths shown in the .ANT files to calculate the end to end length!
  • Boom Correction

    USING PROFESSIONAL ELEMENT CLIPS FROM RW BADLAND LTD BOOM CORRECTION IS REQUIRED AS FOLLOWS: ADD TO THE TOTAL LENGTH (END TO END) OF EACH PARASITIC ELEMENT (NOT DE)...

    50 & 70MHz = 0mm
    144MHz = +6mm
    432MHz = +7mm
  • End Caps...

    Do not use plastic end caps on the parasitic elements (reflector and directors), these will affect tuning!
  • Driven Element

    The DE length is end to end which includes the centre gap!
  • Boom length

    Allow an additional +50mm at either end of the boom to maintain tuning across its entire length, and also give a professional look...
    Example: WA6XX Reflector to D4 spacing is 2400mm + 50mm + 50mm = 2500mm BOOM LENGTH!
  • WARNINGS

    DOUBLE CHECK YOUR MEASUREMENTS BEFORE YOU CUT & DRILL!

    DO NOT ALTER THE DESIGN IN ANY WAY I.E. NUMBER OF ELEMENTS, LENGTHS, DIAMETERS OR POSITIONS. IF BUILT CORRECTLY THESE DESIGNS WILL NOT REQUIRE ANY ADJUSTMENT!

Wave Antennas...

  • THESE YAGI ANTENNA DESIGNS ARE NOT FOR COMMERCIAL USE OF ANY KIND WITHOUT PRIOR CONSENT!
  • Private experimenters are free to use these designs for their own personal enlightenment. However, no guarantee or warranty is offered or implied.
  • MY WEBSITE DOES NOT USE COOKIES, EXTERNAL LINKS MIGHT!
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