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
Last time I tried to saw a core it wiper the teeth right off a hack saw blade. Maybe it was a bad blade? Tried another, then gave up. Ron W8RJL Ok, I have a requirement where an additional one or two
Cutting a FT-240 type 33...in half ?? oops. I meant type 31...not type 33, my error. Jim VE7RF _______________________________________________ _______________________________________________ TowerTal
Hold on, Jim - Please say that <isn't> a metal NEMA box with flange connectors at both ends? 73 from Ian GM3SEK OD, silver 393 coax been that is screws. braid sanded, have an quickly. since they ____
Whether or not this would work depends entirely upon the flatness and flatness of the cuts, and how small you managed to make the air gap based on that flatness. What you're describing sounds like th
Author: "Roger (K8RI) on TT" <K8RI-on-TowerTalk@tm.net>
Date: Tue, 10 Feb 2015 04:44:20 -0500
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
Author: "Roger (K8RI) on TT" <K8RI-on-TowerTalk@tm.net>
Date: Tue, 10 Feb 2015 04:54:38 -0500
That's ceramic and death to metal saw blades. It takes a good, thin, abrasive blade, or better yet a diamond blade. Then you need to lap the mating surfaces flat enough that they want to stick to eac
Its a thick walled plastic nema box.... and toroids are type 31, not type 33. 7-17 female connectors on each end. Existing chokes consist of 4 turns of 393 through 4 x type 31 cores. Steve, G3TXQ tri
Thank goodness it's a <plastic> NEMA box (the choke would do nothing in a metal box). But why use a box with bulkhead connectors anyway? That seems to be the root cause of all the problems. I never u
In the PPT you linked, there are slightly fewer effective turns on the binocular than on the tall stack; he's comparing 3 complete turns through a stack of 8 toroids, with 3 turns through part of the
Jim, Try a tile saw, or brick saw. If you don't have one, keep your toroid in your car and while you drive around, keep an eye open for construction crews laying brick. Chris KF7P Ok, I have a requir
Instead of trying to cut it, how about scoring it with a glass cutter and snapping it. Since the material is ceramic-ish, hopefully it will follow the scoring marks fairly well. Ends will be rough, b
The difference between "binocular" style and all in a stack is the difference in inductance and in the stray C. When the cores are in a single stack, ALL of the turns pass through all of the cores. W
Why are you putting coax-wound ferrite chokes in boxes? It might make them "pretty," but it limits their ability to get rid of the power that they dissipate, which increases the likelihood of failure