1:1 Balun 1.5 - 54 Mhz  3kW - #1113
1:1 Balun 1.5 - 54 Mhz 3kW - #1113
1113 Alternate View 1
1113 Alternate View 2
1113 Alternate View 3

1:1 Balun 1.5 - 54 Mhz 3kW - #1113


Manufacturer: Balun Designs
SKU: 1113
Price: $59.95
$60.45 1113e - Eyebolts on sides
$61.35 1113et - Eyebolts on sides & top
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Description
Specifications
 

One of Dr. Jerry Sevick's (W2FMI) original designs.  We have enhanced the original by using an enclosure and various connector configurations that allow easy installation with just about any antenna installation. 

Please review our Accessories Category for additional RF connector types and mounting options.

This is a current balun and has the widest operating frequency range, lowest core stress and provides the best overall balance of any balun for given cost, size, and weight. This balun is the best type to balance currents on each side of a 1/2 wave dipole or the driven element of a yagi while providing the perfect transition from a balanced antenna to unbalanced coax feedline.  Installing this balun will not affect antenna matching unless the feedline is acting as part of the antenna

Of course, this is not a desirable situation
and installing this balun will correct the problem if one exists with the antenna. In beam installations, using a 1:1 balun in series with the antenna’s feed system can substantially improve the antenna’s front-to-back and front-to-side ratios. It does this by providing the antenna's driven elements with balanced current at the feedpoint and by preventing the feedline from acting as part of the antenna.

It is a seldom appreciated fact
that feedlines, which are not adequately decoupled, can act as efficient vertical antennas degrading an otherwise excellent radiation pattern. The addition of a 1:1 balun can significantly reduce feedline radiation and dramatically decrease RFI and TVI. Beam antennas especially benefit from improved balanced drive and superior feedline isolation, but even simple dipoles benefit from properly selected and installed 1:1 current baluns. Receiver noise may also be reduced by eliminating signal pickup by the coax shield.

Here are plots of the same dipole with and without a balun. 
Notice how the pattern is distorted without the feedline being isolated by the balun:

 
Click to Enlarge


*** One Exception ***

It must be pointed out that a 1:1 balun should never be used on the second harmonic of a half-wave center-fed dipole fed with coax like an 80 meter dipole being used on 40 meters. The impedance can be as great as 5,000 ohms creating very high voltages which can bring about voltage breakdown and/or excessive heating. This exception ONLY applies to HALF WAVE CENTER FED DIPOLES WHEN USING A 1:1 BALUN AT THE FEEDPOINT.  

 
 
 
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