The below antenna analyser plot viewing a 450ohm resistive load attached to the balanced side of the balun and measured at a nominal impedance of 50ohms presented as anticipated an approximate 50ohm load to.
A '4 to 1' will convert the 50 ohms of your coax to 200 ohms ' ie 4 times' A '9 to 1' will convert the 50 ohms of your coax to 450 ohms ' ie 9 times ' And now for a few wise words from VK5AJL, John Langsford, visit his web site for the whole story Voltage Balun A voltage Balun utilises some form of transformer action to transfer energy back and forth between a balanced and unbalanced transmission line. Requiring a unun to feed a long wire antenna ideally without a tuner a 9:1 voltage unun design using a T200-2. Working in the forward direction a 1 to 1 is 50 in 50 out. Cut 22 feet (6.7 meters) of the RG8 (assuming it’s for HF use). Loop Antenna Balun Unun DIY kit T200-2 Type 2 4:1 baluns are designed for. This sounds like a strange first step, but it will ensure the bottle expands and is nice and firm for wrapping the RG8 cable around. The best high power (1KW) 4:1 BALUN 1 to 30 MHz I constructed was a dual 2. A 4 to1 balun can also match 50 Ohm to 12 Ohms, and a 9 to 1 can match 50 Ohm to 5 ohms. The first step is to put the 2 litre plastic bottle (complete with lid) in the freezer for an hour. When we say a Balun or UnUn is a 4 to 1 device it will work just as well backwards. The Balun and The UnUn - page 1 When is a Balun, not a Balun, when it is an UnUn ! Balun = "Balanced-to-Unbalanced" UnUn = "Unbalanced-to-Unbalanced" Looking at the two diagrams above you will see the common terminal for the Balun goes to the HOT terminal of the unbalanced side where as the common terminal in the UnUn goes to the COLD side of both the input and the output.
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