I'm the one that made the recommendations. Other than the two Balun
Designs units and the #8232 units from The Wireman being used with my
station..............I don't know a darn thing about them other
than...........they work. I'm not using a 1115T balun. Measuring the
baluns and putting results on paper is one thing. Putting them into a
station configuration and using them, as I have, is another. I
prefer the latter.
73
Bob, K4TAX
On 12/9/2018 12:47 PM, Jim Brown wrote:
I wonder if anyone using or recommending products like this have ever
measured them. They are not easy to measure. You can't measure them
accurately with a single-port antenna analyzer.
N6KT, a member of our contest club is building a station in the
Caribbean and asked me to measure a Balun Designs 1115T common mode
choke (often called a 1:1 current balun). It looks NOTHING like it's
data sheet, which shows an approximately flat high choking impedance
over the HF bands. It would be USELESS on 40, 80, and 160M! From what
I've seen them write about chokes, I don't believe that they
understand how common mode chokes work, and I certainly wouldn't
suggest that someone ask them for advice.
The Wireman 8232 is based on W2DU's excellent work from many years
ago. He built chokes with 50, 100, and 200 of the largest #73
Fair-Rite beads that fit over RG142. This size bead of this material
has the unique property of relatively constant choking impedance in
the HF spectrum, but you have to a LOT of them. Only the 200-bead
choke has sufficient choking impedance to handle high power and kill
receive noise, and that's what he recommended, yet most products sold
as a "W2DU balun" have many fewer. The larger #31 cores are not useful
at HF until you wind multiple turns through them, but are often sold
for use as a string of beads on coax.
How many beads are in the 8232? Are they Fair-Rite #73?
73, Jim K9YC
On 12/9/2018 5:33 AM, Bob McGraw K4TAX wrote:
Balun Designs, both 1:1 and 4:1 for use with tuners. I have both
because I also have a folded dipole that I feed direct.
I suggest you give the folks at Balun Designs a call and discuss your
exact needs. Take their advice.
Also see the DJ0IP site for details on baluns. Just Google DJ0IP.
And I use the 8232 common mode choke from The Wireman.
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