Model 4110 - QRP 4:1 Current Balun - 3.5 - 54 MHz - 300 Watts

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This unit will be available for order - Friday October 29th

This model is the very useful 4:1 current balun, one of the most versatile ratios for a low power balun. Great for off center fed dipoles, ladder line fed multiband dipoles etc. Extremely compact and light weight with alternative connectors just for the QRP operator. The binding post version allows quick antenna setup and connections using either Banana Plugs or by binding bare wire in the versatile binding post. 

If you would like the binding posts spaced for use with a dual banana plug adapter, please select 3/4 inch spacing when you add to the shopping cart.  1 inch spacing allows increased access to the rotating portion of the binding post for easier turning.



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

Dipole mount and alternate RF connectors are available in "Accessories & Connectors" section of our website




  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 with 2 bifilar wire pairs wound as 4:1 current balun.
  Winding Material   Silver flashed 18 gauge Teflon insulated wire. 
  5000v breakdown voltage
  Power Rating   3.5 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   3.5 to 54 MHz
  Insertion Loss   Less than 0.1db
  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 lightweight 3x2x1.5 inch - Link to dimensional drawing
  Additional Info   Very high efficiency (98-99%). 

Installation Notes