New Antenna Wiring... Diode... Help | FerrariChat

New Antenna Wiring... Diode... Help

Discussion in '308/328' started by Imatk, Jan 28, 2025.

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  1. Imatk

    Imatk Formula Junior

    May 6, 2007
    768
    I got a new antenna... this one:
    https://www.amazon.com/dp/B00MIA182O?ref=ppx_yo2ov_dt_b_fed_asin_title

    Because my old antenna doesn't go up and down anymore.

    I knew going in that the new antenna wiring would be different and I followed the instructions on how to create a diode board from this thread:
    https://www.ferrarichat.com/forum/threads/308-antenna-mast-replacement-suggestion.566439/page-4


    I know little to nothing about electronics so I'm quite certain I'm doing something wrong.

    In this configuration the antenna only goes up.. this is with both leads of the new antenna connected and one lead of the power wires coming from the switch connected, the black clip is clipped to the wire that by testing I found out is the "down" wire.

    This configuration goes Up ONLY
    Image Unavailable, Please Login


    The problem is... if I connect the black to either diode the antenna STILL only goes up even though the "down" wire (as far as I can tell) is the one connected.

    The only way I can get the antenna to go DOWN is to disconnect the WHITE lead which is connected to the GREEN wire from the antenna. And leave the RED lead which is connected to the RED wire and then use either the BLACK lead from the power wire or RED lead from the power wire. Doesn't matter which one I use the antenna will go down with the configurations below.

    This configuration goes Down ONLY
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    This configuration goes Down ONLY
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    This is how I have the diodes wired... I THINK in the same way as the previous mentioned thread.

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    I haven't soldered anything yet... wanted to make sure it worked before I did.

    Any help would be greatly appreciated.
     
  2. Sergio Tavares

    Sergio Tavares Formula 3

    Nov 15, 2018
    1,308
    Full Name:
    Sergio Tavares
    you need two SPDT relays
    wire one to console switch output, then for the other reverse the output
     
  3. Imatk

    Imatk Formula Junior

    May 6, 2007
    768
    I figured it out. You only need one diode... but that might differ on another antenna, not sure.
     
  4. Imatk

    Imatk Formula Junior

    May 6, 2007
    768
    Made a video for anyone wondering how to wire it:



    Skip to 20:43 for wiring explanation
     
    mixedgas likes this.
  5. mk e

    mk e F1 World Champ

    Oct 31, 2003
    13,732
    The twilight zone
    Full Name:
    Help me get this thing finished! https://gofund.me/39def36c
    The board you built originally built is 2 diodes in parallel, which is effectively 1 diode with double the current rating it I'm remembering basic circuits right. If a current draw is not specified for the motor, maybe measure the resistance of the motor to confirm the single diode you are using is rated for enough current.

    I = v/r, use v=14 which is the running voltage, r= whatever you measure for the resistance of the antenna motor.
     
  6. Imatk

    Imatk Formula Junior

    May 6, 2007
    768
    Right, that's assuming that it was supposed to be wired with both in parallel... I have no idea since it wasn't clear from the thread. There's a picture of the diode board, and then a picture of 2 wires going in and two wires coming out.

    The diode I have in there is a 3a 200v ... although I don't know how many amps are running through it... but at 12v I'm guessing a 200v diode is plenty?
     
  7. mk e

    mk e F1 World Champ

    Oct 31, 2003
    13,732
    The twilight zone
    Full Name:
    Help me get this thing finished! https://gofund.me/39def36c
    The voltage it fine (assume 14V not 12 btw) its the amperage that is to worry about. Somewhere in the instructions it might say what the current draw is (measured in amps), but if not you can measure it directly with an amp meter or indirectly by measuring the resistance and calculating with the formula I gave you.
     
    Imatk likes this.
  8. Imatk

    Imatk Formula Junior

    May 6, 2007
    768
    Looks like I need to replace it with a 10 amp since it draws 3 - 5 amps according to the box. Thanks for the help man!
     

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