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So here's the real issue, I want to break these two cables(2 conductor 22ga twisted pair with braided shield) with inline connectors for ease of installation.
Have you checked out www.digikey.com? Maybe one of the circular metal connectors? You mentioned the wiring was shielded twisted pair. Do you know what signals are on these wires? If they're RS-232 or ARINC429 then we're not talking about fast signals, rf, or sensitive analog signals. You could cut the twisted pair, add a wire and pin on the shield on each side of the cut (see http://www.aeroelectric.com/articles/pigtail/pigtail.html) and carry the shield through the connector on a pin. (An AMP CPC connector would be a good candidate for this.) Or if the mating halves of the connector have metal bodies with a solid locking mechanism you could carry the shield through on the connector body. I wouldn't recommend either of these methods if the signals are relying on the shield for impedance control, but I doubt they are. Twisted pair will have a fairly consistent impedance between the two wires, and in any case it would be difficult to maintain a specific impedance between a wire and a shield. Real impedance control requires coax or something similar.
Tom Gourley
----- Original Message ----- From: "Greenbacks, Ltd." <N4ZQ@comcast.net>
To: "Lancair Mailing List" <lml@lancaironline.net>
Sent: Saturday, April 22, 2006 9:22 AM
Subject: [LML] Re: Avionics=Black Art
Back to the issue of shield grounding for a moment...
The Apollo/UPSAT/Garmin AT install manual wiring diagram for the MX20 interface with a WX500 shows both the Tx and Rx cables having their shields terminated at each end with connection to the chassis of each unit. The WX500 install manual specifies that the shields be terminated at one end only:
Tx grounded at the WX500 chassis and Rx grounded at the MX20 chassis. I haven't the foggiest notion of which one is the more elegant solution but I'm inclined to ground at both ends as per the MX20 manual since I do not expect to build ground loops into my system. ):
So here's the real issue, I want to break these two cables(2 conductor 22ga twisted pair with braided shield) with inline connectors for ease of installation.
I haven't been able to locate suitable connectors which will do the job and maintain the integrity of the shield. Any suggestions for a connector part #/manufacturer?
Angier Ames
N4ZQ
N3ZQ
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