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  1. #1
    Newcomer
    Join Date
    Sep 2010
    Location
    PHOENIX AZ
    Posts
    8

    Unhappy Ign interference what to do ?

    Getting heavy ign interference. Radio operation is reported good on radio checks.
    Uniden 538pro
    *** stainless 6' antenna with coil
    swr's are good.
    93 s10 blazer 4.3 cpi automatic eng running condition good.
    Antenna is hard mounted on roof at center
    coax is run in large loop around roof of truck with no tite coils.
    System voltage is 14.4v running
    relocate antenna farther from ign coil at rear of roof ?
    Run radio power and ground straight to batt.?
    Optima yellow top batt is located in back of truck
    Attached Images Attached Images

  2. #2
    Newcomer
    Join Date
    Oct 2014
    Posts
    15

    Default Re: Ign interference what to do ?

    As with all mobile radios, the power should be ran directly from the battery.
    The battery acts like a filter, it smooths out the AC current from the alternator and gives you a true DC current to your radio.
    You could also use a Brute Force Capacitor -- usually found in most stereo shops, CB radio shops, etc...

    Most everything in newer vehicles is pulse width modulated.
    The Alternator, the fuel injection, even the transmission and fuel pump.
    Lot's of sources for noise.

  3. #3
    Newcomer
    Join Date
    Sep 2010
    Location
    PHOENIX AZ
    Posts
    8

    Default Re: Ign interference what to do ?

    GOOD IDEA. IGN CONTROLLED RELAY THROWING +12V DIRECTLY FROM BATT TO RADIO AND GROUND RADIO DIRECTLY TO BATT NEGATIVE. I GO DO THAT.

  4. #4
    Newcomer
    Join Date
    Oct 2014
    Posts
    15

    Default Re: Ign interference what to do ?

    You will want to put two fuses, one on the positive wire, one on the negative wire - about 12 inches from the battery.
    That way if the wire chafes or shorts out, you will not catch the vehicle on fire.
    Drill a hole in the firewall and use a rubber grommet.
    Do not run it between the door and the door frame or next to something else already protruding through the firewall.

  5. #5
    Advanced Member
    Join Date
    Nov 2009
    Location
    Heart of Dixie
    Posts
    1,937

    Default Re: Ign interference what to do ?

    I pick-up a noise filter (Legacy Silencer Series LN-70) 10 amp noise filter for a scanner and a CB (maybe an electronic store?). It is a small plastic looking rectangle with wires out of it and it helped the loud cracking noise some...

 

 

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