Shielded cable branch connection

[flickroll]

What's the best way to make a shielded branch connection? Consider the following drawing:

http://www.advanced-flight-systems.c...%20Adaptor.pdf

For example, what is the best way to parallel off of the G430 P4001-56 wire to the autopilot?

Would be easy for a non shielded wire, but I'm not sure of the optimum way to do this with a shielded conductor. Thanks

[AltonD]

solder sleeves. Stein has some of them.

http://www.steinair.com/hshrink.htm

Strip the insulation off the sheild, and shrink this on the sheild.

[RV6_flyer]

I like to start with at the SOURCE of the signal and run each circuit from the source just like the other branch is not there.

You will need to splice the two branches together at the source.

I wish you were near by so that I could SHOW you how I would do it as it is difficult to type it up.

I would use a single wire from the unit connector. The two wires from the shielded cable would splice into it. I would "Daisy Chain" the shields together and run one ground wire from the shield to the ground.

The drawing you reference does NOT show a shielded wire on P4001-46. If using single wires, I would still do it the way described above. Individual wires spliced together at the source contact or as close to the contact as possible.

[flickroll]

Originally Posted by RV6_flyer

The drawing you reference does NOT show a shielded wire on P4001-46. If using single wires, I would still do it the way described above. Individual wires spliced together at the source contact or as close to the contact as possible.

You're correct, the drawing I referenced doesn't show a shielded wire, but the G430 installation manual shows one out of that pin on P4001. I would think any serial or ARINC cable ought to be shielded.

[apkp777]

Get the solder sleeves from Stein. They are a very good way to connect shields.

[flickroll]

Originally Posted by RV6_flyer

I would use a single wire from the unit connector. The two wires from the shielded cable would splice into it. I would "Daisy Chain" the shields together and run one ground wire from the shield to the ground.

Are you soldering the branch wires to the parent conductor (wire from the pin), or using a crimp?

If soldered, I'd be worried that eventually the soldered connection at the pin could fail (break). If crimped, I'd be worried that there would be too long of an unshielded wire going into the pin.

Guess I'm a worry wart

Thanks

[flickroll]

Originally Posted by apkp777

Get the solder sleeves from Stein. They are a very good way to connect shields.

Terminating the shields is not the problem. I have had great luck over the years soldering a shield termination wire to the shield that has been pulled back over the conductor, then using heat shrink over the soldered connection. More labor intensive than a solder sleeve, but also less expensive (virtually nil) and less bulky.

I'm trying to find the best way to essentially have two conductors come out of the same pin. Since you can't put two wires in a pin, a branch connection is necessary.

[apkp777]

Ah, gotcha. Yeah no problem making your own solder connection for the shields. You can still use a solder sleeve (or your method) to splice a wire to make a "Y" connection so that you can use 1 pin supply 2 wires. Raychem makes a nice solder butt splice that you can get from Home Depot. They are cheap and very good quality. I don't think you will see them fail, though I share your concern. I am a little more reluctant to make my own solder splices. Though that too is a pretty solid joint. As you know 2 wires to a single pin is a no, no.

[apkp777]

I should add that I have to do the same task in joining the Dynon AP servo wires prior to pinning to the Dynon Network cable. I plan to use solder sleeves (only because I have a bunch) Otherwise I would use the Raychem solder sleeves from Home Depot.

[az_gila]

Originally Posted by flickroll

.... If crimped, I'd be worried that there would be too long of an unshielded wire going into the pin.

Guess I'm a worry wart

Thanks

...frequencies, the Mil Spec (and some NASA documents) is 2 inches max. for a shield pigtail.