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I have recently fitted a jvc cd player to my car (astra estate). CDs play fine and FM radio is fine but AM radio reception goes bad when the ignition is turned on and the car started. This also happened with the radio that was in the car when I bought it (1 month ago)

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  • thmjo1 Jun 30, 2008

    How do I check the ground? Simple instructions please as I'm a bit of a numpty when it comes to things electronic!
    Cheers

  • Anonymous Mar 31, 2014

    My car radio was only playing CDs took out radio to find attena wasn't plugged in plugged in now radio drops power checked all connections which are fine

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All in all it just points to a really bad antenna design for AM since using my body as the antenna made it very clear.

So if you can check the wiring for the AM antenna to make sure its not grounded or you can try replacing the antenna..

Hope that helps.....

Posted on Jun 30, 2008

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Hi-

check this link, maybe you can get some info in here click HERE


Posted on Jun 30, 2008

  • Edgar Allan Pagayona
    Edgar Allan Pagayona Jun 30, 2008

    Hi-


    Ignition Noise
    Ignition noise is another type of noise that is quite annoying. It
    usually sounds like a popping or buzzing sound whenever the engine is
    running. The best cure is to remove the motor but since we can't do that, we
    will have to rely on some other form of remedy. Follow the steps below to
    eliminate or reduce ignition noise.


    1. Make sure you are using resistor type spark plugs and resistor type
      plug wires.

    2. Determine where the noise is coming from. If the noise is a popping
      sound that occurs 2 or 3 times a second, you probably have a loose or bad plug
      wire. First, make sure that all plug wires are seated properly. If this
      doesn't do the trick, you may have a bad plug wire. Usually this occurs due
      to a pinhole in the insulation of the wire. Whenever the plug wire is
      energized, an arc jumps through the pinhole to the chassis of the vehicle.
      Replace with silicone resistor plug wires.

    3. If the noise is a buzzing sound, the problem is usually associated with
      the points, distributor, or coil. Try replacing the condenser on both the
      coil and points. Make sure all plug wires are seated properly in the
      distributor cap. Additionally, you might try adding a 2200 uF cap from the
      positive terminal on the coil to chassis ground.

    4. Don't use the fuse block in the vehicle to derive power for the source
      unit. Run the Constant Hot B+ (memory) wire directly to the battery's positive
      terminal.

    5. If you still have noise, it could be occurring because of
      induction. Try pulling the source unit out of the dash and check for noise.
      If the noise is eliminated, try rerouting any wiring harnesses that are close
      to the deck. If this is not possible, try using self adhesive metal
      shielding. This might just do the trick.



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Make sure antenna has connected firmly and cable to antenna shielded well, if there there is a weak shield area on antenna cable you can use aluminum foil to cover it. If antenna signal is stronger interference will not effect.

Posted on Jun 30, 2008

  • ExpressFiX
    ExpressFiX Jun 30, 2008

    Getting a reliable Noise filter also will help. Noise filter is simple and low cost that you can get from local A/V car stereo shops
    look like this usually



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The AM band is affected first because of is wavelength. 1 MHz vs 100 MHz (center frequencies) makes a huge difference. Measure with a decent DVM the resistance between chassis ground and the shield of the antenna cable at the radio. Then measure resistance between the center conductor and the 'whip' of the antenna. Some antennas use a wire that wraps around the of the 'whip' (if you can make contact, you might have to break the coating to do so). Both readings should be well under 5 ohms especially the ground. also try this

First check to make sure the antenna at the back of the radio has not come loose.
2. Remove the plastic cover on the front passenger door threshold held in place by three pressure clips.
3. Peel back the carpet on the front seat passenger floor.
4. Locate the coax antenna cable running along the side.
5. Reconnect the two pieces of antenna that have come loose.
6. Roll the carpet back, and re-install the threshold cover.

Posted on Jun 30, 2008

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Check the ground.
Thanks,
Lee

Posted on Jun 30, 2008

  • Lee A.
    Lee A. Jun 30, 2008

    You can also purchase a noise filter from radio shack that should help. It connects to the power leads of the radio.
    Thanks,
    lee


  • Lee A.
    Lee A. Jun 30, 2008

    I would probably just install a noise filter like I previously mentioned as this is your best bet. Did you install the radio yourself?
    Thanks,
    Lee


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