Software => Software libre => Mensaje iniciado por: maripuri en Abril 12, 2018, 20:23:31 pm

Título: Yagi Calculator
Publicado por: maripuri en Abril 12, 2018, 20:23:31 pm


Yagi Calculator by John Drew

Yagi Calculator es un programa para Windows que también funciona bien en Linux bajo Wine.

El programa fue desarrollado originalmente en los años 90 como un programa de DOS y su objetivo es el cálculo de las medidas de la antena yagi estilo largo de DL6WU que se usan en bandas de aficionados comprendidas entre 144Mhz y 2.Ghz. La yagi DL6WU es considerada como de fácil construcción, ampliio ancho de banda y de resultados muy respetados.

versión en curso:  v2.6.18 (May 2016)


Yagi Calculator is a program to assist with the design of long yagi antennas. It uses the graphs and principles developed by DL6WU and printed originally in the German Radio Magazine VHF Communications (March 1982). The article was titled Extremely Long Yagi Antennas. For best front to back ratio it is recommended that a yagi be constructed with one of the following numbers of elements - 10,14,19,24. Yagi builders are reminded that DL6WU designs are primarily for long yagis. A boom length of 2 wavelengths (or 10 elements) would be a minimum sized antenna. On the other hand, yagis with as few as 8 elements have used the design and worked very well.

The work of David VK3AUU (AR Feb 1988) in developing some equations to fit DL6WU's graphs was very valuable. The reflector calculations are based on a Basic program written by KY4Z and W6NBI and with suggestions by DL6WU. The ARRL Antenna Handbook provided information, as did various sources on the Internet. K5OE's site at is a particularly useful one.

The author acknowledges the 1998 ARRL Handbook for information on coaxial cable impedance, dielectric and velocity factor.

I acknowledge Kevin Schmidt W9CF ( for the correction factor for square section rod of 1.18 * cross section of round tube and also for the formula to find the equivalent round cross section for both square and flat element materials (Version 2.5.0)

dself = w[0.5 + 0.9t/w - 0.22(t/w)2] where w is width of material and t is thickness.

The formula source for the impedance calculations is from "Round and Square Section Parallel Transmission Lines Theory, Practice and Applications" by Roger Harrison and Andy Sayers VK2AES, GippsTech Conference 2009, Churchhill, Victoria, Australia.

Square section: Zo=0.45 + 344[s/(s+d)] - 345[s/(s+D)]^2 + 411[s/(s+D)]^3 where s is face-to-face spacing, D=width of square-section line.

Circular section line: Zo=972(s/d) - 481(s/D)^2 + 86(s/D)^3-547 where s is centre-to-centre spacing, D=diameter of circular-section line.

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