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7. July 2026
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lpda.php    14338 Bytes    04-03-2025 19:13:17


L.P.D.A. Designer


Logarithmic Periodic Dipole Antenna Calculator




LPDA



REQUIREMENTS

min. Freq. [MHz]
    
max. Freq. [MHz]
    
max. Boomlength (Goal, in mm)
    
Scale factor [τ]
   0.76 < τ < 0.98
rel. Spacing [σ]
Boomlength [mm]
   (all inclusive :-)
Number of Elements
Gain [dBi] (approx.)



DESIGN DATA FOR YOUR LPDA



The javascript starts with the minimum value of τ = 0.76. If a solution could be found, τ is increased as long as the length of the boom is shorter than your design goal and as long as τ is smaller than the maximum value of τ = 0.98. As we are dealing with an integer number of elements, the solution presented here is based on the rounded down value of elements.


Mounting of the radials
... and the support




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t1 = 7299 d

t2 = 250 ms

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