eHam.net - Amateur Radio (Ham Radio) Community

Call Search
     

New to Ham Radio?
My Profile

Community
Articles
Forums
News
Reviews
Friends Remembered
Strays
Survey Question

Operating
Contesting
DX Cluster Spots
Propagation

Resources
Calendar
Classifieds
Ham Exams
Ham Links
List Archives
News Articles
Product Reviews
QSL Managers

Site Info
eHam Help (FAQ)
Support the site
The eHam Team
Advertising Info
Vision Statement
About eHam.net


Reviews Categories | Antenna parts, accessories, incl. baluns, hardware, etc. | BALUN DESIGNS Dual Core 4:1 Current Balun 5kw Teflon #4115 Help


Reviews Summary for BALUN DESIGNS Dual Core 4:1 Current Balun 5kw Teflon #4115
BALUN DESIGNS Dual Core 4:1 Current Balun 5kw Teflon #4115 Reviews: 14 Average rating: 5.0/5 MSRP: $97.95
Description: For the ham that wants the ultimate 4:1 current balun, this new dual core design fills the need! This is a balun originally designed by Guanella and subsequently improved by Dr. Jerry Sevick (W2FMI). By utilizing Thermaleze wire inserted in teflon tubes, Dr. Sevick was able to substantially increase the breakdown voltage between both conductors and windings while improving the overall input impedance. Building the balun with two separately wound cores (one for each conductor) creates 5kw of total power handling (10kw PEP) and greatly increases the inductive reactance.

Product is in production.
More info: http://www.balundesigns.com/servlet/the-78/*NEW*-Dual-Core-4-cln-1/Detail
Email Subscription
You are not subscribed to this review.

Subscribe!
My Subscriptions
Subscriptions Help

You can write your own review of the BALUN DESIGNS Dual Core 4:1 Current Balun 5kw Teflon #4115.

<— Page 2 of 2

WC4R Rating: 5/5 Dec 22, 2008 09:32 Send this review to a friend
The best of the best  Time owned: 0 to 3 months
OMG!!! This balun is amazing. Perfect in every way.
I bought the eyelet version to replace my Radio Works burnt balun on my super loop. What a great upgrade. A week later I got the stud version when I built a 160m flat-top fed with ladder line.
Bob is fantastic to work with; fast email and telephone response. Quality on top of quality. No sealed up with epoxy unit here either. Bob designed it so you can take a look inside and inspect his workmanship. His web site shows honest interior pictures of the product build.
VERY reasonable price considering what you actually get. These products will really handle high power AND high SWR. THE BALUN for the real world. After 35 years I finally found a balun that will go on every one of my antennas.
 
W6IZT Rating: 5/5 Dec 16, 2008 08:35 Send this review to a friend
A great product  Time owned: 0 to 3 months
I purchased this balun to use with a Nye Viking MB-V-A tuner. I was experiencing noticable current imbalance with the internal 1:1 balun. I normally wind my own baluns but I thought that I would give this one a try.

I am very impressed with the overall quality of the balun. With this balun I am not longer seeing a current imbalance.

Well worth the price

Gregg
W6IZT
 
K2VI Rating: 5/5 Dec 3, 2008 16:42 Send this review to a friend
commercial grade  Time owned: 6 to 12 months
Im one critical person and it take's quite a bit to impress me, I must say i have never seen such an extreme duty balun in all my days as a ham operator. I smoked many baluns but this 4:1 dual core balun is impervious to RF damage. I might add that bob is a great person to deal with and will always offer suggestions to make your antenna preform to it's optimum ability.Bob is highly knowledgable and friendly.As a side note, I just ordered another dual core balun just in case bob decides to retire. It will probably never be used but good insurance,As of this time there is no balun as efficient and strong as bob's balun designs baluns.Thanks bob.
tony K2VI
 
AE4CW Rating: 5/5 Aug 16, 2008 15:07 Send this review to a friend
Excellent 4:1 Balun with Great Common Mode Choking  Time owned: 0 to 3 months
This is Dr. Sevick's premiere 4:1 current balun design. It's transmission lines are wound on two separate ferrites with twice the number of turns that are possible on a single-core design. This results in a major increase in common mode impedance across the HF bands.

I asked Bob (the owner) to build this version to see how well it could handle the high common-mode RF levels I was seeing on the coax coming into the shack from my OCF dipole with a single-core balun. In a word the results were EXCELLENT.

On 40M through 6M common mode currents were reduced by a MINIMUM of 15X (yes, 15 times less RF on the outside shield of the coax). The 80M reduction was about 2.4X, so an additional common mode choke might be necessary, but not so far. The by-product is that the antenna is now being fed with almost all the transmitter power rather than radiating from the transmission line or being shunted to ground.

So, if you need a 4:1 balun that can handle tough situations, this is likely the best one you can buy anywhere.

P.S. Balun Designs also has a single-core 4:1 balun paired with a 1:1 choke (model #4113ocf) which should yield similar results based on my experiments.
 
<— Page 2 of 2


If you have any questions, problems, or suggestions about Reviews, please email your Reviews Manager.