King ADF debugging

Discussion in 'Avionics and Upgrades' started by murphey, Dec 20, 2018.

  1. murphey

    murphey Final Approach PoA Supporter

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    I've got a KR 86 that until a few weeks ago, worked perfectly.
    Symptoms:
    Powers on.
    Lights up
    TEST button makes the needle spin correctly
    But - in ADF mode, does not point to the local ADF which is 5 miles away.

    Anyone got any ideas?
     
  2. Jmcmanna

    Jmcmanna Pre-takeoff checklist

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    Corroded wiring? I’m currently working on an issue with my HSI working fine in vloc mode a few weeks ago, to not working all of a sudden (no flags, just not working). I haven’t taken it in yet, but signs seem to be pointing to the connection between the gps/nav/comm and the HSI. Maybe since the unit thinks it’s working fine, but displaying incorrectly, something needs some new wiring or soldering?
     
  3. Clip4

    Clip4 En-Route

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    If you know someone who has one, swap them out for a test. Unless you really like listening to AM radio.......
     
  4. murphey

    murphey Final Approach PoA Supporter

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    already did. worse with the other unit.
     
  5. Clip4

    Clip4 En-Route

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    Did you put yours in their plane?
     
  6. murphey

    murphey Final Approach PoA Supporter

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    Nope....It was a unit that was pulled for updated avionics. No way to put mine in to test.
     
  7. GRG55

    GRG55 Final Approach

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    Sounds like the internal tests are fine. Perhaps corroded/failed antenna connections?
     
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  8. mondtster

    mondtster Pattern Altitude

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    I’d start with something simple. Do you have proof that the NDB is working? If not, then you need to do that first. Another thought is to use an AM radio station that you know the location of the transmitter.
     
  9. murphey

    murphey Final Approach PoA Supporter

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    Yes, both the NDB and a local AM station are working. I can tune my AM radio to the NDB. Trying the corroded or disconnected antenna idea next,
     
  10. GRG55

    GRG55 Final Approach

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    Fixed? :popcorn:
     
  11. murphey

    murphey Final Approach PoA Supporter

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    Not yet...haven't had a chance to get back out to the airport...perhaps later today. W&B after Christmas dinner will impact flying.
     
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  12. sonopoa

    sonopoa Pre-Flight

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    Yes that is my thought too.
     
  13. murphey

    murphey Final Approach PoA Supporter

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    Winner winner! I was grounded until Sept due to knee replacement. On aug 31, the NDB was OTS permanentaly, and I didn’t know, and the shop obviously didn’t pay attention, either. I checked thr NOTAM today to discover it. Tuned in another NDB, works perfectly.
     
  14. mondtster

    mondtster Pattern Altitude

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    It’s nice when the fix is simple!