Bob,
It appears that you're of a mind that the winding (coax) is tightly wound around
the core. That's not how some guys are doing it. It's just loosely looped
through the core. See fig. 36 in Jim's paper.
Wes
On 2/7/2016 10:03 PM, Bob McGraw K4TAX wrote:
I am speaking of the radius of the coax bend. To have a coax bend radius of
3" the torroid would be huge.......the size of a large coffee can. A 3" OD, x
1.5" ID torroid would typically have a winding radius of less than ~1", even
with 2 stacked cores. For my "ugly balun" project I use 4" ID PVC which has
an OD of ~4.5" and which provides a bend radius of 2.25".
73
Bob, K4TAX
On 2/7/2016 10:32 PM, Chuck Catledge wrote:
It’s quite practical to use 25 to 35 mm radius bends of RG400 for large
ferrite cores including both the one-piece and the snap-on varieties. RG400
has the same diameter as RG-58, i.e. 0.195”. See K9YC’s tutorial here:
http://audiosystemsgroup.com/RFI-Ham.pdf
All of the RF common mode chokes I have made using small cable (i.e. RG400
through RG6) use radii of 1-3 inches with the RG6 tending toward 3” and
greater due to the foam dielectric.
---
Chuck, AE4CW
From: Mel Farrer [mailto:[email protected]]
Subject: Re: [Elecraft] Balun Questions
SORRY, but the min static bending radius for RG-303 is 25 mm and RG-400 is 35
mm. For torroid wrap which is better?????
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