Interior View of the Hy-Gain AV-640 Matching Unit. Please click on the image to enlarge it. A 1:1 current UNUN (right) for common mode rejection is followed by a 9T:20T autotransformer (left) for a turns ratio of 1:2.22. The black and white wires are connected in series. The black wire is the so-called "common winding", while the white wire.. The AV-640 is self contained for simple, convenient portable or fixed operation. Mechanical construction of the AV-640 is designed for extreme light weight and high wind survival. Aircraft grade 6063-T832 aluminum and high strength fiberglass are used for the entire radiator. The trap-free design presents a very
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