Model VT-1 Antenna Enclosure

The view to the right shows the Model VT-1 antenna enclosure with the electronics module removed, which reveals the reflector board inside. The reflector board is fundamental to the design and operation of the Model VT-1. It is positioned at an angle of 35 degrees from the horizontal which enables the phased array to be positioned 20 degrees from the vertical. Thus, the Model VT-1 phased array points slightly downward, preventing rainfall, snow and debris from collecting inside the antenna elements or on the antenna plane. With this design, ordinary piezo tweeters can be used for the antenna elements. Also, in cold climates, the reflector board rather than the phased array is heated to prevent snow and ice buildup, which would absorb the sodar signal and degrade system performance. As shown in the picture, the inside surfaces of the enclosure are foam lined to absorb side-lobe energy. The reflector board design along with the foam-lined enclosure that surrounds the antenna make the Model VT-1 almost immune to interference from side-lobe echoes. Thus, the Model VT-1 can be used successfully at virtually any location.