1:1 Isolation Balun  1-31 MHz - 5kW - #1116d
1:1 Isolation Balun 1-31 MHz - 5kW - #1116d
1116d Alternate View 1
1116d Alternate View 2
1116d Alternate View 3

1:1 Isolation Balun 1-31 MHz - 5kW - #1116d

Manufacturer: Balun Designs
SKU: 1116d
Price: $79.95
$81.25 Model 1116det - Eyebolt Sides & Top
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This Isolation balun is very similar to the Model 1115d with one key exception.  The material utilized for the two stacked cores is optimized for the lower HF bands and provides exceptional choking impedance at these frequencies. Over 5000 ohms of choking on 160m and over 6300 ohms on 80 and 40 meters. The 1116d even generates over 4000 ohms of choking impedance on 20 meters.  No other design can provide this level of isolation and choking at these lower frequencies.  

Note that although optimized for lower frequencies, this balun also provides very good choking at higher frequencies and can be used up through 30MHz.

Please go to the Accessories category for additional RF connector types and mounting options.

Testing shows SWR remains below 1.05 across the entire HF band, transformation is perfectly flat, return loss is between 60-80 dbmw and choking impedance is maximized at over 6k ohms on the low HF frequencies. Please click on the graphs shown below to view the complete test results.  

Click to Enlarge

Tests run utilizing AIM-4170uhf Network Analyzer and a precision non-inductive 50 ohm load

Noise Reduction

While the most common advice is to improve the station's RF ground, the root of the problem is in the poor isolation of the feedline from antenna currents. If your goal is to reduce feedline radiation and improve reception by reducing noise, feedline isolation baluns are an excellent choice. Adding an additonal isolation balun at the point where the feedline exits the near field area of the antenna will substantially reduce unwanted feedline radiation and reception of EMI without the need for improved station grounding.

***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 COAX FED HALF WAVE DIPOLES WHEN USING A 1:1 BALUN AT THE FEEDPOINT.

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