gordonrsmith921@yahoo.com
Joined: 06 Oct 2009
Posts: 24
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 Posted: Sun Oct 11, 2009 6:18 am Post subject: Control Stick Switches – Best Practice? |
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Given: RV A/C with airframe tied directly to battery ground (rear Batteries).
I am planning the following switch functions on the control stick: Trim (4 way), Com PTT, Autopilot Control, and perhaps Com channel flip-flop and other functions.
All of these functions require a momentary pull to low (ground) to activate/toggle a function. My original planning was to employ a single ground conductor up the stick to the switches. This ground conductor would be tied, locally, to A/C ground in the area of the stick.
After reviewing various Z figures it appears that a better practice would be to bring the stick ground conductor to the Panel G3 (inside firewall) or the Avx G5 (back side of panel). Which is preferred?
Is it proper to have a single ground conductor for all of the stick switch functions? Should the PTT be given special consideration and a separate ground path with perhaps both (to-from) paths shielded.
PS Engineering schematics show PTT wiring only from the mic jack (PTT from the tip and low-ground from the barrel). Can the remote stick PTT be wired directly from the Intercom, connecting to the respective PTT mic pin and mic low connection at the Intercom? Should these conductors be shielded in this case?
Perhaps the bottom line might be:
1. 1 ground conductor for trim relay decks going to local ground.
2. 1 ground conductor for PTT going to Intercom or mic jack.
3. 1 ground conductor for the other toggle functions to Avx G5.
Overkill?
Gordon Smith
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