- #Understanding building and using baluns and ununs download how to
- #Understanding building and using baluns and ununs download full
COMMON MODE CURRENT in a feed line is caused by an unbalanced antenna system Radiation pattern distortion Feed line radiation, RFI Noise pickup on receive Coaxial cable is not symmetrical. Twin lead, Ladder line, Window line Coax is unbalanced transmission line Antenna may not be symmetrical Feed line is not perpendicular to the axis of the antenna Proximity of surrounding objects, ground conditions Feed point impedance of many types of antennas does not match 50 ohm coax Folded Dipoles, OCF Dipoles, Windom, End feds, etc. Many ham radio antennas are balanced λ/2 Dipoles, Yagis, Loops, Quads, etc. Many grey areas and blurred linesĥ Why do we need them ? Antenna system balance A lot of confusing, conflicting and flat out wrong information on the internet.
#Understanding building and using baluns and ununs download full
At least 50% written in the Internet about baluns is false.” Rick Westerman, DJ0IP / NJ0IP “Don’t believe anyone who claims to be an expert on baluns.” Bernie Huth, W4BGH “Baluns can be difficult components to analyze and understand fully.” Steve Hunt, G3TXQ “Very few people fully understand this technology and as a result it is still far from reaching its full potential.” Jerry Sevick, W2FMI Most confusing and misunderstood devices in ham radio. The web is full of all kinds of misleading and/or wrong information on this topic. Who uses baluns or chokes ? Why did you decide to use them ? Will they increase antenna bandwidth ? Why do we need them ?Ĥ The unfortunate truth “No other area of technology is so vastly misunderstood as Baluns (and RF Chokes). What are they ? Will they lower my SWR ? Survey the group here.
#Understanding building and using baluns and ununs download how to
2 What we will cover Common mode chokes Baluns Ununs Why we need themįeed line currents Differential mode current Common mode current Measuring common mode current How common mode chokes work Types of common mode chokes Air core chokes Bead chokes Toroid chokes Baluns Current baluns Voltage baluns Impedance ratios How to test a balun Ununs