Truckers Report Jobs

Find Trucking Jobs

Company Driver Company Driver Dry Van Dry Van Flatbed Flatbed Refrigerated Refrigerated Specialized Specialized Owner Operator Owner Operator
More Trucking Job Searches ⌄ Fewer Trucking Job Searches
⌃

Noise in FM Radio Speaker

Discussion in 'CB Radio Forum' started by Michael 247, Jul 4, 2019.

  1. Jul 4, 2019 #1
    Michael 247

    Michael 247 Heavy Load Member

    768
    3,519
    Nov 20, 2017
    Dublin Va
    0
    I installed a CB in a 1990 White /GMC..When I key up it makes noise in the FM Radio Speaker..if I leave the FM Radio off the CB works good and does not put noise in the FM Radio Speaker..How can I fix this problem ?
     
    Michael 247, Jul 4, 2019
    Michael 247, Jul 4, 2019
    #1
  2. Truckers Report Jobs

    Trucking Jobs in 30 seconds

    Every month 400 people find a job with the help of TruckersReport.

  3. Jul 4, 2019 #2
    jessejamesdallas

    jessejamesdallas Road Train Member

    1,415
    854
    Oct 3, 2008
    Republic of Texas
    0
    Keep stereo turned off when using CB...There is no fix...and the more power you run, the worse it's going to get...
     
    jessejamesdallas, Jul 4, 2019
    jessejamesdallas, Jul 4, 2019
    #2
  4. Jul 4, 2019 #3
    Ridgeline

    Ridgeline Road Train Member

    20,732
    101,019
    Dec 18, 2011
    Michigan
    0
    Replace the coax.
     
    Ridgeline, Jul 4, 2019
    Ridgeline, Jul 4, 2019
    #3
  5. Jul 4, 2019 #4
    Michael 247

    Michael 247 Heavy Load Member

    768
    3,519
    Nov 20, 2017
    Dublin Va
    0
    it's a new coax cable from CB Shop
     
    Michael 247, Jul 4, 2019
    Michael 247, Jul 4, 2019
    #4
  7. Jul 4, 2019 #5
    Ridgeline

    Ridgeline Road Train Member

    20,732
    101,019
    Dec 18, 2011
    Michigan
    0
    Then get some chokes and put it on the coax, you have a ground problem from what is called common current mode, which makes the outer shield of the coax as part of the antenna.
     
    Ridgeline, Jul 4, 2019
    Ridgeline, Jul 4, 2019
    #5
  8. Jul 5, 2019 #6
    Meteorgray

    Meteorgray Heavy Load Member

    754
    596
    Jan 1, 2016
    0
    First make sure your antenna is properly RF grounded. Do this with a multimeter's Ohm function, with one probe on the antenna coax's outside shield such as where it is in contact with the mounting screw collar that normally is attached to the radio, and the other probe on the vehicle's chassis ground. If the Ohm value is not zero, then try installing a short piece of copper mesh to better ground the antenna to the vehicle.
     
    Meteorgray, Jul 5, 2019
    Meteorgray, Jul 5, 2019
    #6
  9. Jul 5, 2019 #7
    Michael 247

    Michael 247 Heavy Load Member

    768
    3,519
    Nov 20, 2017
    Dublin Va
    0
    I put a ground wire from antenna bracket bolt to a bolt on cab..the noise I'm hearing is talk back..i can hear what I say through the FM Radio Speaker..i will just leave FM Radio off until I get a CB Shop to check it..Thanks for all the replys
     
    Michael 247, Jul 5, 2019
    Michael 247, Jul 5, 2019
    #7
  10. Jul 5, 2019 #8
    Method240

    Method240 Bobtail Member

    47
    29
    Jun 9, 2019
    TN
    0
    it's grounding. I've run KWs without that. the FM isn't grounded
     
    Method240, Jul 5, 2019
    Method240, Jul 5, 2019
    #8
    Michael 247 Thanks this.
  • Truckers Report Jobs

    Trucking Jobs in 30 seconds

    Every month 400 people find a job with the help of TruckersReport.