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Balun designs

Balun designs

First of all , please remember:
Baluns will not improve SWR (the exception is where a balun used as part of a matching network,
I like to design and creat baluns by myself. Quality is top notch. Don’t waste your money buying some of the cheap china knock-off’s. Do by yourself. Follow our balun designs. Well made.

The balun should do only two jobs.
1.Isolate transmission line
2.Provide balanced output current

Proper balun designs
A properly engineered balun will include these design points: High winding inductance (reactance) and Low stray capacitance. Very short internal transmission lines- << 1/4 wave (remember:  the shorter the better). High power components- High voltage wire and insulation to withstand high power or a mismatch. Large wire gauge reduces I2R losses. Large cores because help to prevent saturation and provide the necessary high inductive reactance values on the low bands.

Schermata 2015-12-11 alle 01.00.06

balun designs

Schermata 2015-12-11 alle 01.00.11

balun designs

balun designs

balun designs

Balun designs considerations
High choking reactance, 250Ω minimum
(limits low frequency response)
Low stray capacitance
(limits high frequency response)
Short transmission line, << ¼ wave
(The shorter, the better)
High power handling
Minimize resistive losses
Correct core selection
Robust mechanical design
Line Impedance, Z0
For 1:1 make equal to load and line impedance
For 4:1, make geometric mean of line and load impedance (e.g., 50Ω to 200Ω requires 100Ω line)

Useful Links
Balun Designs LLC – High quality baluns and ununs – The best website if you wanna buy one already built
Balun designs – nice book! Enjoy – few bucks and will be yours!
———-I suggest you to watch this nice video on BALUN designs – click down here on the arrow—–

 

 

 

 

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