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Kontronik Drives Jazz and Jive ESC's and other Kontronik equipment support


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Old 08-16-2021, 11:44 PM   #1 (permalink)
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Default Ferrite core wraps

Well, first Kosmik is going into a RAW and the BEC master/slave cables are too short due to that darn ferrite ring.. How many wraps are enough in this case? I can likely make it work if I do 2-3 wraps, but it got me thinking - at what point it becomes ineffective at removing BEC noise etc. You'd think an ESC that goes into 700's would come with some slightly longer cables
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Old 08-17-2021, 05:55 AM   #2 (permalink)
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Like any cable length, it will be too long in some applications and too short in other applications.

I had the same issue with one particular application (Logo 700) so I made my own extensions and re-wrapped the ferrite rings using the original number of wraps and following the same pattern.
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Old 08-17-2021, 06:01 AM   #3 (permalink)
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+1

I have made my own leads to get them exactly the right length. It also means you don't have an unnecessary join by using an extension cable.

I cannot remember what Kontronik use but some manufacturers use 24 AWG wire and I used 22 AWG so a bit better all round in my opinion.

(I know where this could well end up!!)
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Old 08-17-2021, 11:32 AM   #4 (permalink)
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Seems making my own is the right course of action - I actually just received my Hozan crimper and a bunch of pins/wire etc. I don't trust my skills just yet, but I'll practice a bit and see how I get on.

I also have a couple of 550mm BEC cables that Scorpion sells for their Tribunus on larger heli installs. I was surprised to see the wire is actually made by RCProPlus, and uses some interesting pins and housings that I've never seen before. If the specs are to be believed, this particular wire (while being smaller diameter than 20awg) has higher strand counts and less resistance. I will use these if my crimping isn't up to par

Thanks!
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Old 08-17-2021, 11:59 AM   #5 (permalink)
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The same situation and lack of quality extensions available to purchase at the time is what forced me to learn how to make my own extensions.
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Old 08-18-2021, 04:21 AM   #6 (permalink)
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BuddyRC JR style servo extension leads are 22AWG with high quality connectors. As far as servo wire, I mostly use Hansen Hobbies Deluxe 22 AWG servo wire.
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Last edited by jhamel; 08-18-2021 at 04:25 AM.. Reason: more info
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Old 08-18-2021, 04:29 PM   #7 (permalink)
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So I actually asked Kontronik what an appropriate number of wraps is, and they said at least 5.


Perhaps even more interestingly, they actually said twisted wire is even better, and would eliminate the need for the ferrite core...that'd be easier than dealing with extra length and finding a spot for the core. May have to try that - wish I had the equipment to test the effectiveness of one method vs. another.
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Old 08-18-2021, 04:31 PM   #8 (permalink)
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Quote:
Originally Posted by jhamel View Post
BuddyRC JR style servo extension leads are 22AWG with high quality connectors. As far as servo wire, I mostly use Hansen Hobbies Deluxe 22 AWG servo wire.

I have the Hansen 22awg black servo wire here, but still find it finicky to get pins into housing, even with 22awg. 20awg isn't an option or I'd use that instead. I need to source one of the HT-95 crimpers you have jhamel, but I seldom see them listed for a reasonable price - I'll keep hunting!
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Old 08-18-2021, 07:16 PM   #9 (permalink)
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Yes, believe it or not, the number of wraps is important just as the number of twists per foot is when using twisted cable. The most common network cables are categorized as Unshielded Twisted Pair (UTP). There is quite a bit of science involved in selecting the correct ferrite bead and number of wraps.


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Originally Posted by Ty89m View Post
So I actually asked Kontronik what an appropriate number of wraps is, and they said at least 5.


Perhaps even more interestingly, they actually said twisted wire is even better, and would eliminate the need for the ferrite core...that'd be easier than dealing with extra length and finding a spot for the core. May have to try that - wish I had the equipment to test the effectiveness of one method vs. another.
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Old 08-19-2021, 10:58 AM   #10 (permalink)
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Quote:
Originally Posted by Ace Dude View Post
Yes, believe it or not, the number of wraps is important just as the number of twists per foot is when using twisted cable. The most common network cables are categorized as Unshielded Twisted Pair (UTP). There is quite a bit of science involved in selecting the correct ferrite bead and number of wraps.
I have no doubt! Iím leery of ditching the ferrite and just running twisted wire, but it would be nice to ditch that ring + extra cabling length.
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Old 08-21-2021, 01:18 AM   #11 (permalink)
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I have stopped using the ferrit rings a long time ago since I swapped from 35 mhz to 2.4 in 2001 and never had any issues with my Futaba receivers.

4 x Kosmik 200, 2 x Kosmik 250 and a bunch of Power jives 120 and 80.

It is even suggested in Henseleits TDR manual to omit the rings in order to get the approriate cable length.

Obviously you could first do a test with motor off at extreme long distance
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Old 08-21-2021, 01:51 PM   #12 (permalink)
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Quote:
Originally Posted by belgoheli View Post
I have stopped using the ferrit rings a long time ago since I swapped from 35 mhz to 2.4 in 2001 and never had any issues with my Futaba receivers.

4 x Kosmik 200, 2 x Kosmik 250 and a bunch of Power jives 120 and 80.

It is even suggested in Henseleits TDR manual to omit the rings in order to get the approriate cable length.

Obviously you could first do a test with motor off at extreme long distance

Thanks for the info - I've seen a few folks going sans-rings over the years with success, may test my luck.
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Old 08-21-2021, 02:00 PM   #13 (permalink)
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Itís just a gamble. Whatís the worse that can happen. 🤣
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Old 08-21-2021, 02:05 PM   #14 (permalink)
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Quote:
Originally Posted by jhamel View Post
Itís just a gamble. Whatís the worse that can happen. 🤣

Yeah, it's a sketchy proposition on my first 700... Kontronik confirmed that twisted wire is a suitable replacement so would use that regardless.
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Old 08-21-2021, 02:21 PM   #15 (permalink)
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The YGE ESCs use twisted wire along with a ferrite ring on the larger ESCs. But, what do they know about electronics?
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Old 08-23-2021, 02:45 PM   #16 (permalink)
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Obviously all manufacturers want to stay on 200% of the safe side and they do know where the 100% safe side is
That's how it works from a warranty side of the product...Has all to do with safety margin for the warranty period on each and every product.

Say you really did apply the ferrit rings and nevertheless you did get issues with transmission and crashed a heli, guess what the warranty is worth?
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Last edited by belgoheli; 08-23-2021 at 03:02 PM..
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