LPDA design

Log-periodic dipole array element scheduler

Applies your chosen τ and σ to list element lengths, spacing and the resulting apex angle for a broadband LPDA.

Highest frequency (MHz)

Lowest frequency (MHz)

Scale factor τ

Spacing factor σ

Typical values: τ ≈ 0.86–0.92, σ ≈ 0.05–0.07. Adjust for impedance/gain trade-offs.

Keep boom alignment precise—small errors accumulate along a long array.

Summary

Element count 11

Apex angle 53.13 °

#	Frequency	Element length	Spacing
1	144 MHz	1.0409 m	0.052 m
2	129.6 MHz	1.1566 m	0.0578 m
3	116.64 MHz	1.2851 m	0.0643 m
4	104.976 MHz	1.4279 m	0.0714 m
5	94.478 MHz	1.5866 m	0.0793 m
6	85.031 MHz	1.7629 m	0.0881 m
7	76.528 MHz	1.9587 m	0.0979 m
8	68.875 MHz	2.1764 m	0.1088 m
9	61.987 MHz	2.4182 m	0.1209 m
10	55.789 MHz	2.6869 m	0.1343 m
11	50.21 MHz	2.9854 m	0.1493 m