Helpo with a RF remote ...

Discussion in 'Wireless & RF Design' started by slklite, Aug 5, 2014.

  1. slklite

    Thread Starter New Member

    Aug 5, 2014
    2
    0
    Hello guys, I'm having trouble with a remote control for a car remote access.

    I bought a complete module with 2 remotes.

    They keys fobs are like VW cars, and I want to install this on a ford remote fob.

    Because obviously, it's not plug and play, I had to grind the circuit to adapt it in the ford key fob.

    Now that I finished, I replaced some of the circuit lines with small cables ...

    The problem I'm facing now, is that it works only when I touch the RF chip with fingers. If I don't touch it, nothing, it's like no signal comes out of the remote ...

    Here are some pics.

    Original remote circuit

    [​IMG]

    [​IMG]

    Grinded circuit

    [​IMG]

    [​IMG]

    Original remote

    [​IMG]

    New remote

    [​IMG]

    Do you have any suggestions ?

    Thank you for your help.

    Best regards.
     
  2. alfacliff

    Well-Known Member

    Dec 13, 2013
    2,449
    428
    some of the printed runs on those remotes are antennas, inductors, and such.. I have never had any sucess with using wire after the board is damaged.
     
  3. MikeML

    AAC Fanatic!

    Oct 2, 2009
    5,450
    1,066
    You have detuned (pulled the frequency of) the extremely simplistic transmitter (or reciever) by hacking it. It takes some hand capacitance (to your body) to tune one to the same frequency as the other. Very common problem with garage door remotes, too...

    A is not talking to B
     
  4. slklite

    Thread Starter New Member

    Aug 5, 2014
    2
    0
    All right, thanks for the answer.

    Is there a way to fix it ? All the buttons work as they should, but I have to touch the chrome part next to the battery for it to work ...
     
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