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Thread: Installing a transponder and ADS-B, Instructions?

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  1. #1

    Installing a transponder and ADS-B, Instructions?

    I'm looking to buy an airplane and many of the experimental I am looking at do not have transponders or ADS-B (unsurprising). I live in a Mode C veil, so a transponder (and, in a year ADS-B) will be required. I have an extensive electronics background, but I have not worked on airplanes.

    As I evaluate airplanes, I would like to know what I need to do to install a Transponder in an experimental. I am not too worried about installing ABS-B on something with a transponder (because of the uAvionics Skybecon), but I cannot find information on installing a transponder from scratch. Does anyone know a link to instructions or an install video to install a transponder/encoder on a plane that has not had one before?

  2. #2
    CarlOrton's Avatar
    Join Date
    Jul 2011
    DFW Area
    Hi, This;

    While I don't have either a link to, or the actual instructions, I installed my own transponder in my homebuilt in 2012. It was a microair 2.25" unit. I thought it was simple and straightforward.

    Just connected a data cable from my EFIS to the transponder so the altitude could be provided (along with power) and then antenna cable to a standard rod antenna on the belly.

    Since I'm also under a Mode C veil, I had the local instrument shop guy come to the hangar to do the biennial transponder cert to ensure what the pitot was sensing was what the transponder was reporting.

    I'll install my own on my current build project as well, albeit with ADS-B out, which requires just a bit more stuff like having a WAAS GPS source. Still haven't decided which solution to use in this instance. Still waiting for the $1000 ADS-B transponder in a box solution. ;-)

    Carl Orton
    Sonex #1170 / Zenith 750 Cruzer

  3. #3

    Join Date
    Jul 2011
    Clarklake, MI
    Intstall transponder. Install antenna. Install an altitude encoder (usually a blind encoder). Connect the wires then spend some quality time with an avionics shop for an Appendix E/F check

  4. #4
    cub builder's Avatar
    Join Date
    Nov 2011
    North Central AR
    I recently replaced the old Terra Transponder in one of my planes with a Sandia Aerospace STX-165. It has the encoder integral to the transponder, so you install power, ground, antenna, and connect a hose to the static port. That's it, unless you add in the overpriced OAT probe. Fits either a 3-1/8 round instrument hole, or can be adapted to fit half width in a standard transponder mounting hole, or custom cut your panel to fit.

    After installation, you need to swing by a radio shop to have the transponder tested for output, frequency and correct altitude reporting. (regular transponder cert).

    The STX165 does give you the option of running a cable to your EFIS to supply it with pressure altitude, or to plug into separate encoder if you want (EFIS Supplying pressure Altitude).

    -Cub Builder
    Last edited by cub builder; 11-05-2018 at 03:46 PM.

  5. #5

    Join Date
    Feb 2012
    Barrington, IL
    Quote Originally Posted by thisadviceisworthles View Post
    I. Does anyone know a link to instructions or an install video to install a transponder/encoder on a plane that has not had one before?

    AC 43.13-2B - Acceptable Methods, Techniques, and Practices - Aircraft Alterations

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