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Thread: Push-To-Talk Wiring

  1. #1
    Senior Member Dave S's Avatar
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    Default Push-To-Talk Wiring

    Got a question......what kind of wire have you used to connect a stick mounted PTT switch to the radio/intercom harness?

    Will shielded Tefzel wire hold up to the constant flexing between the stick and wherever it is attached to the fuselage?

    The spiral phone wire I originally used for the flexing portion of the wire run appears to be giving up.

    Thanks,

    Dave S
    KF7 Trigear - Flying
    912ULS Warp Drive

  2. #2
    Senior Member Av8r_Sed's Avatar
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    Default Re: Push-To-Talk Wiring

    I used the shielded Tefzel allowing for a somewhat large bend radius where the movement is. It's been good for one season so far.
    -- Paul S
    Model III SN910
    582 IVO Med

  3. #3
    Dave Holl's Avatar
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    Default Re: Push-To-Talk Wiring

    That's what mr Boeing uses!!!
    Dave Holl
    Building Kitfox MK7
    Rotax 912ULS

  4. #4
    Senior Member Dave S's Avatar
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    Default Re: Push-To-Talk Wiring

    Sounds good to me......Think I will be ordering up some shielded wire.

    BTW...Av8r...how big of a diameter loop did you decide on?

    Dave S

  5. #5
    Senior Member Dorsal's Avatar
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    Default Re: Push-To-Talk Wiring

    I used regular 22 gauge Tefzel wire (no shield) with a generous bend. There is no signal on a PTT line so shielding is not necessary from an electrical point of view though may offer some mechanical advantage.
    Dorsal ~~^~~
    Series 7 - Tri-Gear
    912 ULS Warp Drive

  6. #6
    Senior Member Av8r_Sed's Avatar
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    Default Re: Push-To-Talk Wiring

    I have a radius of about 1 1/2 inches. I secured it with wire ties and put the stick through it's full range of motion while making small adjustments.

    I used shielded on the PTT because the long line make a nice antenna when the buttons aren't pushed. I didn't want to channel noise right to my radio / intercom connector.
    -- Paul S
    Model III SN910
    582 IVO Med

  7. #7
    Senior Member Maverick's Avatar
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    Default Re: Push-To-Talk Wiring

    Anyone got a good picture of how you wired the PTT?

    Also, did you run the ground back to the common ground, meaning one would need to run two wires through the control stick mechanism?

    I was planning to use 20ga wire but could use 18. What's the recommendation on wire size.

  8. #8
    Senior Member jrevens's Avatar
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    Default Re: Push-To-Talk Wiring

    You’ll need two wires. 20 ga would be plenty big. There is no current to speak of on this circuit.
    John Evens
    Arvada, CO
    Kitfox SS7 N27JE
    EAA Lifetime
    Chap. 43 honorary Lifetime

  9. #9
    Senior Member efwd's Avatar
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    Default Re: Push-To-Talk Wiring

    I ran all grounds to the same place behind the panel. I have not found any troubles with electrical as of yet. Man, do you know how relieved I am about that?
    Eddie Forward
    Flying
    SS7, 912iS, Garmin G3X

  10. #10
    Senior Member PapuaPilot's Avatar
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    Default Re: Push-To-Talk Wiring

    For the Garmin GTR-20/200 COM radio it says 22 gage wire is standard for everything except the power and ground wires. For my plane I used a common ground on the firewall for everything except my PTT switches. They don't carry any current and are just needing to be grounded. My PTT are hooked to the airframe under the control sticks and work fine.

    FYI I put small quick disconnect plugs on my PTT wires where they come out of the bottom of the sticks. I used some connectors I had on hand from my RC aircraft stuff. This comes in handy if you ever want to remove yours sticks.
    Phil Nelson
    A&P-IA, Maintenance Instructor
    KF 5 Outback, Cont. IO-240
    Flying since 2016

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