How to Design Your Own Yagi Antennas with K6STI Yagi Optimizer
If you are interested in building your own yagi antennas for the HF, VHF or UHF bands, you may want to check out the K6STI Yagi Optimizer software. This is a powerful and user-friendly program that can help you design, analyze and optimize yagi antennas with various configurations and parameters.
K6STI Yagi Optimizer was created by Brian Beezley, K6STI, a well-known antenna designer and author. He has used his software to design many innovative and high-performance yagi antennas, such as the 5-element Hi-VHF yagi with a rearward swept driver element, the 9-element VHF-FM yagi with a horizontal folded dipole and three reflectors, and the 40-element UHF yagi with a 40 dB front-to-rear ratio.
The software allows you to enter the desired frequency range, number of elements, boom length, element diameter and spacing, feed impedance and balun type. It then calculates the optimum element lengths and positions, as well as the antenna gain, front-to-back ratio, SWR, input impedance and radiation pattern. You can also modify any parameter and see how it affects the antenna performance. You can save your designs as text files or export them as NEC files for further analysis with other software.
K6STI Yagi Optimizer is an old DOS program that was released more than 20 years ago. However, it is still very popular among antenna enthusiasts and hobbyists. It can run on modern Windows systems with the help of DOS emulators such as DOSBox or vDos. You can also run it on Linux or Mac OS with Wine or other compatibility layers.
If you want to download K6STI Yagi Optimizer, you can find it on various websites that host ham radio software. However, please note that the software is not free and requires a license key to run. You can purchase a license key from K6STI directly or from authorized dealers such as Array Solutions or DX Engineering. The license key is valid for all versions of the software and can be used on multiple computers.
K6STI Yagi Optimizer is a great tool for anyone who wants to design their own yagi antennas with ease and accuracy. It can help you create antennas that suit your needs and preferences, whether you want high gain, wide bandwidth, low SWR or excellent directivity. With K6STI Yagi Optimizer, you can unleash your creativity and enjoy the hobby of antenna building.
Some examples of yagi antennas designed with K6STI Yagi Optimizer are shown below. These antennas cover different frequency bands and have different numbers of elements and boom lengths. They demonstrate the versatility and efficiency of the software in creating optimal yagi designs.
A 5-element yagi for the Hi-VHF band (54-72 MHz) with a rearward swept driver element. This antenna has a boom length of only 31.4 inches and provides good coverage across all Hi-VHF channels with excellent front-to-rear and front-to-back ratios and moderate gain. The swept driver element reduces the feedpoint impedance and improves the SWR.
A 9-element yagi for the VHF-FM band (88-108 MHz) with a horizontal folded dipole and three reflectors. This antenna has a boom length of 100 inches and provides high gain (7-8 dBd) and front-to-rear ratio (up to 30 dB) over the entire bandwidth. The folded dipole has a higher impedance than a simple dipole and matches better to a 300 ohm feedline. The three reflectors enhance the directivity and reduce the backward radiation.
A 40-element yagi for the UHF band (470-806 MHz) with a 40 dB front-to-rear ratio. This antenna has a boom length of 236 inches and provides very high gain (18-20 dBi) and directivity over the UHF band. The large number of elements ensures a smooth and flat radiation pattern with minimal side lobes and back lobes.
These are just some of the many possible yagi antennas that can be designed with K6STI Yagi Optimizer. You can also experiment with different element shapes, such as loops, quads, or helices, and different feed methods, such as gamma matches, T-matches, or baluns. You can also combine multiple yagis on a single boom or stack them vertically or horizontally for increased gain and bandwidth. ec8f644aee