A/P servo wiring

[woxofswa]

When I built my wing there were no SV wiring kits available so I ran the seven wire twisted bundle that SteinAir sells for A/P servos.

Now that I have run my main SV network bundle, my plan is to splice the wing A/P servo into the network at the wing/fuse connection.

Here is my question. I see that the A/P needs basically two twisted pairs going into the network bundle. I have never had the science of the "twist" explained to me. Can I splice in the Stein line into the network (where all the wires are twisted) or am I going to have to rerun a two twisted pair line all the way through the wing?

Obviously I would prefer the former to the latter.

Thanks in advance.

 

[schristo]

the twist in the stein bundle is only for convenience in making a bundle... as i understand it, in order to get some benefit of a twisted pair in attenuating noise they should be the supply and return from the same circuit.

 

[dynonsupport]

Twisted pair on the data lines basically prevents the data lines from sucking up interference from other things. It's magic as far as this non-EE is concerned, but Wikipedia has some of the "science" behind it. http://en.wikipedia.org/wiki/Twisted_pair.

I'm not sure I'm following what you're looking to do, but you do want the individual DSAB pairs twisted, though even if they weren't you'd probably be OK. If you ended up with network issues though, that would be one of the first things we'd ask you about

 

[woxofswa]

Thanks for the replies. I'll see if I can explain better.
When I built my wing, I installed SteinAir's seven wire generic autopilot servo bundle. It is installed in channel by itself with no other wires or cables.

What I would like to do is splice into the SV network cable at the wing/fuselage joint since I have to make a connection there anyways.

The SteinAir cable is a twisted collection of seven wires. Two pairs would be used for the data circuits and then the power, ground and a/p disconnect would continue on. From the wing splice on to the SV boxes, the data pairs would be twisted. The only place not pair twisted would be the run from the base of the wing to the servo. With a completed wing, running new twisted pairs to the servo would be a hassle if not necessary.

 

[MavSmith]

Ideally the two data pairs would be individually twisted, however your proposed installation is likely to work fine. The twist in the wire bundle from Stein doesn't provide interference benefits of the individual twisted pairs.