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Do I need balun?
Firstly, we will need a balun to use a balanced line feeder or balanced antenna in any case as radios today are not presenting a balanced output. The next point is the effect that any close by objects have on the balanced feed line, walls, buildings in general, towers, all metal objects, ground, everything!
What does a antenna balun do?
This transformer is known as a balun, and they are in operation in anything from telephone lines to transmitters. Baluns are used both to sort out the flow of AC signals and make the necessary impedance transformation between coaxial cable, which has a low impedance, and balanced loads, which have higher impedances.
How are qrpguys baluns used in a balanced antenna?
The QRPGuys baluns are used in matching a balanced antenna, eg. 1/2 wave dipole to your coaxial feed line which is unbalanced. This eliminates feedline radiation that can cause problems such as inducing radiation in nearby objects, like house wiring resulting in feedline power loss and TVI.
What kind of balun to use for vertical antenna?
Long-wire Feed using a 4:1 Balun. The antenna ground side should be attached to a radial system as with a vertical antenna. Like any other antenna system that involves high SWR, use the shortest length and best quality coaxial cable possible.
What kind of balun should I use for my tuner?
In other installations, both the antenna and antenna feedline are balanced and the tuner has an internal or external balun. Unfortunately, most internal tuner baluns are 4:1 voltage baluns, which we will see is a poor choice. In this case, the baluns should be as close as possible to the tuner.
Which is the correct part number for a balun?
A 1:1 balun has the widest operating frequency range, lowest core stress, and provides the best overall balance of any balun for given cost, size, and weight. The DX Engineering part number of the correct unit would be the DXE-BAL050H10AT Current Balun or the DXE-BAL050H11CT Current Balun depending on power levels.