Crackle interference when other truck too close

Discussion in 'CB Radio Forum' started by jokerl90, Dec 5, 2010.

  1. jokerl90

    jokerl90 Light Load Member

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    Sep 19, 2010
    north georgia
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    I'm having a problem with my cb for the past few days. When another truck is within about 100 or 200 yards or closer I get a lot of crackle through my ext speaker when they key up. It seems to get worse the closer they are and the longer they stay keyed up.
    Once the other truck is beyond 100 or 200 yards away from me the crackle is gone and I can hear them clear as a bell.
    Anyone have an idea what is causing this?
    Cobra 29 classic, hustler HQ-27 antenna, all stock. On a 05 Mack Granite.
    Thanks.
     
    Last edited: Dec 5, 2010
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  3. Trashtrucker1265

    Trashtrucker1265 Road Train Member

    1,310
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    Dec 14, 2009
    Inverness, Fl
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    Welcome to world of Mack trucks, I will be of no help to you but just wanted to let you know I'm in the same boat, 2010 Mack Pinnacle and have spent countless amounts of money trying to get things right and I always end up back at the beginning, static, good swr reading, just doesn't seem to ground well with the truck. If you figure anything out, let me know and maybe both of our problems can be solved.
     
  4. jessejamesdallas

    jessejamesdallas Road Train Member

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    Oct 3, 2008
    Republic of Texas
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    Most likely caused by the guy in the other truck running a Amp...Get too close, and that's what it will sound like...The Bigger the Amp the other guy is using, the farther away he can be and make your radio crackle...

    "If" your parked right beside someone running a large enough Amp and you have your radio turned on, he could actually fry your radio...FYI, if thats the case either move...or turn yours off.
     
  5. jokerl90

    jokerl90 Light Load Member

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    Sep 19, 2010
    north georgia
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    It was happening around several different trucks. Some I know were not running any power. I've been in this truck over 5 years, first time for this problem. I'm thinking it was a combination of not so good ground and cold temps or more likely bad coax. the coax outside the cab has become "weathered". Haven't worked since original post,so can't try anything till I do.
    Thanks for the replies!
     
  6. jokerl90

    jokerl90 Light Load Member

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    Sep 19, 2010
    north georgia
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    It was the radio. Put another radio in and no noise or problems.
     
  7. this_is_nascar

    this_is_nascar Light Load Member

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    Jun 25, 2008
    Gloucester City, NJ
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    That's what the RF-Gain on the radio is for. When that close or in a truck-stop, turn the RF-Gain all the way to the left (counter-clockwise). That will help, unless the other person has an amp on. Be careful when this close to another person transmitting. You do risk toasting your receiver parts.
     
  8. kd5drx

    kd5drx <strong>Master of Electronic Communications</stron

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    Nov 28, 2006
    Some where USA
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    Its actually called front end overload. It happens when the reciever section is over powered by the incoming signal. The AGC circuits can't adjust to this strong of a signal fast enough. If this continues it will blow the AGC circuit's completely out. Thats when the radio sounds like garbage.
     
  9. jokerl90

    jokerl90 Light Load Member

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    Sep 19, 2010
    north georgia
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    I Will have to take the bad radio to the shop when I can. I work with the same trucks all the time. I know they are not running any kind of power on their radios.
     
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