View source for Accessories:10 Element Yagi for Mode-S

My [[Accessories:G7RGQ Omni Directiona Antenna|G7RQG]] omni antenna did not receive the aircraft down to ground level of nearby Munich airport. When having a local inversion, I found that there is significantly ground traffic ongoing that I would be able to see on the 30 miles distant Munich airport. So therefore I built a simple 10 element yagi and installed it towards the airport. (In the background, wired to the chimney, you can find my G7RGQ omni antenna)

Not at least this was the reason for the multi channel design of the Mode-S Beast.

[[File:Modesbeast-2ch-omni-yagi.gif|Mode-S Beast: 2 Channel setup with G7RGQ stacked vertical antenna and high gain directional antenna torwards area of special interest]]

So I went into my storage, looked for some material that fits to a design on 1090 MHz (about 2-3 mm element diameter and a 15 mm square boom), took [http://www.vk5dj.com/yagi.html VK5DJ's antenna] calculator and quickly designed a 10 element yagi antenna. Download this [[|description], but mind that the element and boom material needs to be adjusted to what you have. This can easily be done with the calculator. The boom is drilled 0.1 mm smaller than the elements and then the elements, which are chamfered, hammered through it.

[[File:1090yagi10ele 02.jpg|600px|1090 MHz 10 Element Yagi Antenna]]

With this antenna it is easy to receive the ground traffic from the airport.

'''Construction detail: The driven element'''

[[File:1090yagi10ele-driven-element.jpg|600px|1090 MHz 10 Element Yagi Antenna - Driven Element]]

[[File:1090yagi10ele-balun.jpg|600px|1090 MHz 10 Element Yagi Antenna]]