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  #1  
Old 06-03-2019, 12:38 PM
PhatRV PhatRV is offline
 
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Location: Buena Park, California
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Default Dynon Servo Twisted Pair Wiring Question

I am in the process of wiring my Dynon roll servo for my RV8. The diagram specifies two twisted pair cables for each of the servos.

Does this mean I have to use the shielded twisted pair cable or just twist the cables together when I create the wiring loom?

The diagram doesn't show the twisted pair symbol connected to ground so I am assuming the cable pair doesn't have to be shielded?

What have you guys done for your airplane?

Thanks

Phat Vu

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  #2  
Old 06-03-2019, 01:18 PM
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az_gila az_gila is offline
 
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No shield needed. Just twist the two leads together using an electric drill.
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  #3  
Old 06-04-2019, 09:19 AM
PhatRV PhatRV is offline
 
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Thanks for the reply.
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Old 06-04-2019, 10:15 AM
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az_gila az_gila is offline
 
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Also buy my distribution hub at Stein to simplify the wiring...
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  #5  
Old 06-04-2019, 10:34 AM
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pazmanyflyer pazmanyflyer is offline
 
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Quote:
Originally Posted by az_gila View Post
Also buy my distribution hub at Stein to simplify the wiring...
Gill -
Is Stein selling those yet? I do not see them on their website. I just sent in my PDA360EX for a wiring harness and I'll add one to the order if they have them.
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Old 06-04-2019, 11:06 AM
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Bill Boyd Bill Boyd is offline
 
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What happens if you don't twist the wires?

This question has real-world ramifications for this boy who pulled multi-conductor wire early in the project and just now realized Dynon wants some twists in the cabling.
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  #7  
Old 06-04-2019, 11:13 AM
gsxphil gsxphil is offline
 
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I will second SteinAir for doing the harness. They did a great job on mine and simplified it.
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  #8  
Old 06-04-2019, 11:49 AM
PhatRV PhatRV is offline
 
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Quote:
Originally Posted by az_gila View Post
Also buy my distribution hub at Stein to simplify the wiring...
Dynon sells a ready made servo cable for a very reasonable price. One of the goals in this RV8 is to build as much of the electrical and electronic stuff as possible. I always want to learn how these things work .
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  #9  
Old 06-04-2019, 12:01 PM
rv7charlie rv7charlie is offline
 
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Quote:
Originally Posted by Bill Boyd View Post
What happens if you don't twist the wires?

This question has real-world ramifications for this boy who pulled multi-conductor wire early in the project and just now realized Dynon wants some twists in the cabling.
I see two possibilities:
1. No real world ramifications at all

2. Dynon was woefully inadequate in providing proper specs for the required wiring.

If you look at wiring where twisting is critical (ex: CAT5, CAT6 etc computer cable), the number of twists per foot, the direction of twist for each pair, etc, are all spec'd.

In my limited experience, most 'twisted pair' is more for convenience and wire ID than function. Exception might be something like a balanced line pair operating with relatively high source & load impedance.

edit: A closer look at the wiring diagram shows that they also spec'd wire color. My bet is that they're telling the installer what to look for in their harness.

Last edited by rv7charlie : 06-04-2019 at 12:03 PM.
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  #10  
Old 06-04-2019, 01:02 PM
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az_gila az_gila is offline
 
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Quote:
Originally Posted by pazmanyflyer View Post
Gill -
Is Stein selling those yet? I do not see them on their website. I just sent in my PDA360EX for a wiring harness and I'll add one to the order if they have them.
He has them in stock but hasn't added them to his web site yet....
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Grumman Tiger N12GA - flying
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