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Balun Designs

Model 1110 - QRP 1:1 Isolation/Choke balun 1-54 MHz


Model 1110 - QRP 1:1 Isolation/Choke balun 1-54 MHz

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Product Description

This QRP balun is wound with mil spec teflon insulated coax which provides a consistant 50 impedance for the windings. The design provides high levels of feedline isolation, RF choking and excellent return loss for those who want top end performance in a compact, portable and light weight size.  This balun is also available with 75 coax windings upon special request and at no additional charge.

This model is the popular Isolation/choke balun that is perfect for feedline isolation, noise reduction and RFI management. The model 1110w is great for quickly deploying a center fed monoband dipole or a monoband vertical.

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

The enclosure for low power units is small, lightweight and portable, but NOT intended for long term or permanent outdoor use. If used in a long term outdoor installation, additional attention must be given to weatherproofing and possible strain relief. Damage caused by such use is not covered under our lifetime warranty.

Be sure to look at the unique mounts available for the QRP line of baluns


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. This is, of course, 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.



  Core Material   Custom mix low permeability ferrite by Fair Rite Products for maximum bandwidth.
  Core is coated and sealed for long term durability.
  Winding Type   Single core coaxial wound 1:1 current balun.
  Winding Material   Mil Spec small gauge coax with Teflon dielectric, silver flashed braid and center conductor. 
  Power Rating   1.5 to 35 MHz - 300 watts, 35 to 54 MHz - 200 watts.  
  All ratings based on resonant load. High SWR will reduce power handling ability.
  Useable Frequency   1.5 to 54 MHz
  Insertion Loss   Less than .02db
  Connectors   SO-239 connectors are silver plated with Teflon insulation.
  Alternate connectors and Mounting Options are available in the Accessories section.
  Hardware   All Stainless Steel
  Enclosure Type   Polycarbonate (ABS) box with bottom plate that fits flush with the case
  Plate is an exceptional fit that can be easily weatherproofed if desired.
  Dimensions   Very compact and light weight 3x2x1.5 inch
  Additional Info   Very high efficiency (98-99%). 

Installation Notes


Additional Information