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Rebel Hot by Comp Arf

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Rebel Hot by Comp Arf

Old 12-12-2021, 05:39 PM
  #926  
Bob_B
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I dont think its the servos either.
Old 12-12-2021, 05:46 PM
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Originally Posted by Bob_B
I dont think its the servos either.
It may not be. I was just testing things again and discovered with the aircraft system powered up but the transmitter not on the servos are not jittering at all. Once the transmitter is turned on the jittering starts. I tried changing from 22ms timing to 11ms timing but that didn't help. I have the rx connected to the SF16 via the SRXL port. I do have an SRXL2 rx I could try and see if that helps. Not sure what else I could check or change on the transmitter. The transmitter should be up to date as far as software goes. Not sure about the rx though when it was updated.
Old 12-12-2021, 05:47 PM
  #928  
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Are you using twisted servo extension wire or flat ribbon? The signal wire could be acting like an antenna. Perhaps a wrap thru a ferrite core might help.
Old 12-12-2021, 05:49 PM
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Originally Posted by jvaliensi
Are you using twisted servo extension wire or flat ribbon? The signal wire could be acting like an antenna. Perhaps a wrap thru a ferrite core might help.
I'm using flat ribbon cable for the extensions.
Old 12-12-2021, 05:50 PM
  #930  
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Try switching to twisted wire and see if it helps.
Old 12-12-2021, 06:05 PM
  #931  
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Originally Posted by jvaliensi
Try switching to twisted wire and see if it helps.
I'll do some more testing tomorrow. I'll unplug the tail servos from the Smooth Flite 16 and plug a couple servos directly into it without extensions and see if that helps. If it does I assume that means the extensions are causing the issue. I have a several ferrite rings I can try and see if that has any effect, if not I'll order some twisted cable and make up some new extensions with to see if it resolves it.

Thanks guys for the replies, and thanks to anyone that has any other input on this.
Old 12-12-2021, 06:12 PM
  #932  
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I think Baracuda hockey is using 737s with great success
Old 12-12-2021, 10:07 PM
  #933  
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Try 6.6v Li-Fe or discharge the Li-Po packs to 7.4v and try
Old 12-13-2021, 03:40 AM
  #934  
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Originally Posted by rc_heli_flier
I'll do some more testing tomorrow. I'll unplug the tail servos from the Smooth Flite 16 and plug a couple servos directly into it without extensions and see if that helps. If it does I assume that means the extensions are causing the issue. I have a several ferrite rings I can try and see if that has any effect, if not I'll order some twisted cable and make up some new extensions with to see if it resolves it.

Thanks guys for the replies, and thanks to anyone that has any other input on this.
If you decide to order wire get the PB premium or Maxi wire
Old 12-13-2021, 05:39 AM
  #935  
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Couple of things

I use 737's in the tail (well the whole plane really) with no issue on Lipo voltage with home made extensions. As Bob mentioned, they are Powerbox Maxi wire but other than the normal whine you get from digital servos there's no jitter.

Twisted wire works great for cross talk in communication and network cable pairs, for RC, eh.....lets just say the effect of twisted wires is more aesthetic than technical
Old 12-13-2021, 06:06 AM
  #936  
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The weird thing about Powerbox wire is its size. Its 0.35mm^2 which is in between 21 & 22 AWG and is not a standard metric wire size. So ,stripping it is difficult because there are no strippers of the matching size. I would cut some of the copper using a 22AWG stripper. I finally bought an Knipex adjustable stripper and seem to have the best results.
Regular wire, in standard sizes with PVC insulation is easier to get good results with and costs less but is slightly heavier.
Old 12-13-2021, 06:20 AM
  #937  
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Maxi wire has 2x 0.5 and white signal 0.35. You can just see the difference
Wire cutter, stripper use these they suit most gauges and repeatable





Old 12-13-2021, 06:26 AM
  #938  
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I would only used Premium not the max for the mini servo……premium was used on everything before the MAX was out….I used the max on full size high power servo…
Old 12-13-2021, 06:47 AM
  #939  
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I've been having some success with the Knipex 11-82-130 stripper:

https://www.kctool.com/knipex-11-82-...ars-multigrip/

I've had no success with a stripper named Yolanda...
Old 12-13-2021, 07:03 AM
  #940  
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I use Maxi on everything, we have been under spec on the wire for years, servos have gone up in torque and current draw, yet we have not updated the connectors or wire.
My Hot is run fully in Maxi
Old 12-13-2021, 08:58 AM
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If I go with the Maxi wire do I need to buy the connectors they sell as well or will the regular connectors I have that I bought from Hansen Hobbies be sufficient?
Old 12-13-2021, 08:58 AM
  #942  
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Originally Posted by jvaliensi

I've had no success with a stripper named Yolanda...
Funny!!
Old 12-13-2021, 09:33 AM
  #943  
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Originally Posted by rc_heli_flier
If I go with the Maxi wire do I need to buy the connectors they sell as well or will the regular connectors I have that I bought from Hansen Hobbies be sufficient?
You will be fine with Hanson Connectors
Old 12-13-2021, 11:48 AM
  #944  
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The connectors Hanson and Powerbox sell are cheap imitations of Mini-PV 0.10" connectors made by Amphol (Dupont). They work fine but are not as reliable as the Mini-PVs.
If you want to learn more I recommend Matts Tech Pages:

DuPont and ?DuPont? connectors, and how to crimp them properly ? Matt's Tech Pages

In any case, the IWISS crimper is way better than the crimper sold by Hanson and others. Best $25 tool out there.

Amazon Amazon
Old 12-13-2021, 04:49 PM
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I had problems with MKS servo's in the past with extensions and unwanted jitters and movement. Switched to PB maxi wire and problem was solved. Been using it ever since.
Tone
Old 12-13-2021, 05:10 PM
  #946  
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Originally Posted by Agrav8ed
I had problems with MKS servo's in the past with extensions and unwanted jitters and movement. Switched to PB maxi wire and problem was solved. Been using it ever since.
Tone
I ordered some of the maxi wire this evening. Hopefully it will solve the jitter issue. Thanks to everyone that replied.
Old 12-15-2021, 06:26 PM
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If anyone is in need of a CMjets fuel tank for their rebel let me know. Have a brand new one I (foolishly) bought thinking the ARF+ factory one was easily removable. Asking $150 shipped fedex 2 day CONUS only. Cost me over $200 and took a month to get to me originally.
Old 12-15-2021, 06:28 PM
  #948  
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Originally Posted by Dave Wilshere
Try 6.6v Li-Fe or discharge the Li-Po packs to 7.4v and try
Tried that this evening, same thing with jittering. Thanks for the suggestion though.

The maxi wire will be here on Saturday. I'll get an extension made up and report back what I find.
Old 12-15-2021, 10:08 PM
  #949  
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OK, good info. Not 100% the wire is the problem then, but it will be interesting to see!

Dave
Old 12-16-2021, 05:13 AM
  #950  
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Originally Posted by rc_heli_flier
Tried that this evening, same thing with jittering. Thanks for the suggestion though.

The maxi wire will be here on Saturday. I'll get an extension made up and report back what I find.
Might be a PITA to pull one but plugging them in directly would eliminate the extension as the issue

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