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lpda.php   12258 Bytes    19-11-2015 15:58:08


DIY LPDA


Logarithmic Periodic Dipole Antenna Calculator




LPDA



REQUIREMENTS


min. Freq. [MHz]

max. Freq. [MHz]

max. Boomlength (Design Goal)

  

Scale factor [τ]

   0.76 < τ < 0.98

rel. Spacing [σ]

Boomlength

   (without mounting)

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.





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t1 = 3604 d

t2 = 329 ms

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