For those who would like the combination of a 4:1 balun capable of tolerating almost any type of Off Center Fed Dipole or multiband loop installation and still provide the highest possible level of performance, the model 4116 is the solution. As the title indicates, this balun is a hybrid combination of a 4:1 voltage balun and a 1:1 current balun model 1115. If you look closely at the image, you can see the coaxial wound 1:1 current balun underneath the voltage balun stacked above it. This combination results in a very versatile and rugged 4:1 current balun.
UPDATE! To further enhance the choking and feedline isolation of this unit on all bands, we now utilize a new core in the choke balun that is very unique. This core not only works exceptionally well on the lower frequencies, but provides high levels of choking/isolation across the full HF spectrum. Be sure to click on the right hand thumbnail graph below to see exactly what we mean.
By utilizing a voltage balun in the first stage, the unit is able to handle any compromised or severely compromised installation with the 1:1 current balun providing superior RF choking, feedline isolation and excellent current balance. No matter if one or both antenna elements are over a roof line, next to large structures, close by a large amount of metal or strung through multiple trees, this balun can tolerate almost anything. Our beta testing showed the ability to provide excellent performance even in some very difficult and unusual installations.
It should be noted that OCFD antennas were designed for and only intended for use on even harmonics, i.e. 80m, 40, 20m and 10m. Manufacturers that claim all band usage achieve this claim by using a very poor balun that allows the coax feedline to "load" the antenna which will consequently produce a low SWR although antenna efficiency is in the 15-25% range. Baluns such as ours that provide high levels of feedline isolation are ideal for high efficiency antennas, but should not be used on WARC bands or 15m unless power does not exceed 200-300 watts especially for FT8 and RTTY carriers.
"I just wanted to share with you just how great your Model 4116- 4:1 Hybrid Balun 1.5 - 54MHz 3kW works !!! I purchased you balun about two months ago before I headed for Prince Edward Island. I built an OCF dipole 45' - 90' each leg using your new hybrid balun. I never got to use it until today. I traveled 2000 miles to PEI to operate the ILLW from the Cape Bear Lighthouse/Marconi Station.
Never having used it before I left, I was indeed concerned that I might have brought an antenna that does not work. Well, those concerns are history. The antenna worked with your balun wonderfully. I do not even need a tuner for most of 20 and 40 meters !!! The SWR across both those bands without a tuner is anywhere from 1:1 to 1.5:1 !!!
Thank you for this great product."
"I switched over to an OCF dipole recently and was having troubles with common mode currents which were caused by the cheap current balun that I was using to match my RG-8X coax at the feedpoint. I contacted Bob at Balun Designs and and he recommended his new hybrid model the #4116, It features two baluns in one box. One is an isolation balun to keep my feedline from radiating and the other is a 4:1 balun to provide the proper matching to my coax. After I replaced the cheaper balun with this 4116 model I noticed that the feedback problem was solved. The new balun works very well and it seems that I also have lower noise levels on 160 and 80 meters.
I am very pleased with my purchase and I highly recommend Balun Designs if you are considering a balun for your antenna system. I also suggest that you visit Bob's website. It is excellent and provides a great deal of helpful information to assist you in selecting what balun best meets your needs."
Only one application where this balun is not recommended. When building or replacing the 4:1 balun at the feedpoint of a Carolina Windom that incorporates a vertical coaxial radiator, a voltage balun like our model 4125 should be used so RF will pass to the vertical radiator. Please click on the thumbnails below to view the excellent characteristics of this hybrid balun and be sure to note the outstanding return loss of this unit, up to 62 dbmw!!
|Core Material|| Custom mix low permeability ferrite by Fair Rite Products for maximum bandwidth.
Large 2.4 inch cores are coated and sealed for long term durability.
|Winding Type||2 individual cores, first stage wound as 4:1 tuner balun, second as 1:1 current balun.|
|Winding Material|| 2 bifilar windings of 14 gauge Heavy build polyamideimide Allex 240 Winding Wire
in Teflon tubes then Mil Spec coax utilized for the 1:1 isolation/choke balun.
|Power Rating|| 1.5 to 54 MHz - 3kW
All ratings based on resonant load. High SWR will reduce power handling ability.
|Useable Frequency||1.5 to 54 MHz|
|Insertion Loss||Less than .03db|
|Connectors|| SO-239 connectors are gold center conductor with Teflon insulation.
Studs and eyebolts are 1/4 inch.
Alternate connectors and Mounting Options are available in the Accessories section.
|Hardware||All Stainless Steel|
| Enclosure Type
|| NEMA rated 4x marine grade junction box for outdoor installations.
Cover utilizes integral neoprene gasket for weatherproof integrity.
|Dimensions|| 4x4x2 inches for main body of unit
Dimensional Drawing of Standard Enclosure
|Additional Info|| Very high efficiency.
Will not heat up or saturate at like many of the "less expensive" designs.