Model 1115d - Max Choking 1:1 Balun, 1 - 54 MHz, 5kW


Designed for those who want the maximum isolation and choking across the full HF spectrum. Building on the original 1:1 design by Dr. Jerry Sevick, this balun has two (2) cores in a stacked configuration to maximize choking impedance on HF bands from 1- 54MHz. By utilizing Mil-Spec coax, the SWR, Transformation and power handling are excellent while providing a choking impedance that exceeds 10,000 ohms. Even on 80m the choking impedance is over 3,500 ohms.  If you have RFI primarily from the lower frequencies or operate more on the low bands (160 thru 40m) you should consider the model 1116d for excellent suppression and isolation. Sometimes called a choke balun or common mode choke, this 1:1 ratio current balun is the best for feed line isolation and choking. It has the widest operating frequency range, lowest core stress and provides the best overall balance of any balun for given cost, size, and weight. Please click on the graph shown below to see the complete results. 

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150,00 €

  • 1 kg
  • Available
  • Ships within 1-3 days1

Tests performed with AIM-4170c Network Analyzer and precision 50 ohm non inductive load.

Regardless of the antenna you're using, an isolation balun can provide numerous advantages

Prevents unwanted RFI by eliminating feedline common mode currents and radiation 

All power goes to the antenna, improving efficiency 

Reduces noise or EMI picked-up by your coax shield 

Power is balanced between driven elements of antenna 

Can help overcome a less than optimal ground



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 Coax Fed HALF WAVE CENTRE FED DIPOLES WHEN USING A 1:1 BALUN AT THE FEEDPOINT.


Installation Notes