The only way to cut a core, neatly is with an abrasive saw. I think
they'd eat the teeth right off a band saw blade. Diamond is better yet,
but my memory of magnetics is a gap is a gap, no matter how small. I
don't think it'd have a big effect, but there's likely someone who
remembers/knows these characteristics better than I.
HOWEVER. if you are going to add two cores or even one core, it's going
to require more coax, or fewer turns, (unless the current choke is
wound very loose.) fewer turns means much less resistance, or isolation.
Even cutting them, I doubt I could add even 1 core to mine. I am
winding one that spaces the cores a 1/4" using Lexan spacers. I should
have it on the web site before long. That one, I could probably add two
cores by cutting the space to an 1/8th or 1/16th inch. It'd be a real
PITA though as the cores are epoxied to the Lexan and I'd have to make
new spacers. Lexan is expensive.
.
Were it me, I'd just pull the thing out, get some more coax and wind a
new one. It will be neater and most likely, more effective. I'm doing
that with an AV640 matching network for the transformer and choke.
Possibly an R8. Several R5s and R8s in the area and all required
rewinding the transformer to get a proper match.
73 & good luck,
Roger (K8RI)
On 2/10/2015 12:55 AM, Jim Thomson wrote:
Ok, I have a requirement where an additional one or two x 2.4 inch OD, type
33 cores needs to be added to an existing choke balun.
Since each end of the RG-393 silver plated + teflon coax is already silver
soldered to a 7-16 DIN connector at each end of the nema box,
I would rather not have to take the entire assy apart. Major pita. 393 coax
has TWO silver plated braids, and in this case, each of the braids has been
carefully
separated at each end, and each braid is silver soldered to a lug, that is
bolted to the 7-16 din connector flange, via the SS 8-32 machine screws.
IE: 2 of the 4 corners of each 7-16 din female coax connector gets a braid
attachment.
Can a 2.4 inch OD, 1.4 inch ID, type 33 toroid be cut in half, edges sanded,
then placed around the existing 4-5 turns of 393 coax, then
held together via glue, ty-raps, both, or some other method ??? I have an
excellent H-V bandsaw, made for cutting steel, hard steel, and AL.
IE: 80-120-200 ft per minute. It would slice through a toroid very quickly.
If what I propose is feasible, it would save me a lot of grief.
I already checked, and the big, type 43 snap on types will not fit, since they
only have a 1 inch ID.
Tnx...... Jim VE7RF
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