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Surge of Power?

Discussion in 'CB Radio Forum' started by DaltonR121, Aug 15, 2012.

  1. Aug 15, 2012 #1
    DaltonR121

    DaltonR121 Bobtail Member

    43
    6
    Mar 19, 2011
    Masontown, WV
    0
    I did a little looking and couldn't find anything but there may already be another thread on this.

    For some reason, even with the CB turned off, every time I hit the key, it sends a surge of power to the CB and it will turn on for a split second. I keep it turned off because I wanted to avoid frying it but I'm afraid that is what has happened. I'm not worried about the CB, that can be replaced. The truck is a 2008 Kenworth T800. Not sure if that helps any but what usually causes this? What can I do to keep the truck from powering up the CB when I hit the key??
     
    DaltonR121, Aug 15, 2012
    DaltonR121, Aug 15, 2012
    #1
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  3. Aug 15, 2012 #2
    Jersey John

    Jersey John Bobtail Member

    20
    4
    Jun 24, 2012
    East Coast of PA
    0
    Disconect the power wires. I have the same issue with my 29 in my Western Star, been doing it for yrs and haven't had any issues with the radio
     
    Jersey John, Aug 15, 2012
    Jersey John, Aug 15, 2012
    #2
  4. Aug 15, 2012 #3
    handlebar

    handlebar Heavy Load Member

    829
    592
    May 28, 2010
    Them Thar Hills, TN, ZIP EIEIO
    0
    Depending upon how old your CB is, the dynamotor supply for the TX high voltage may be spinning up when you hit the PTT. When I got my Novice in 1962, my dad & I built a CW rig for his car. When we wanted to switch over to TX, we had to give it a couple of seconds to spin up to warm the tubes (40M). Until he re-wired the power leads, though, the dynamotor would spin up even without the rest of the rig being on.
    I s'pose it's unlikely that's what's going on here, though. It's more likely your mic is actually switching your landing lights or sumpin'. I concur with Jersey John; sounds like the most comprehensive solution.
    73,
    Handlebar
     
    handlebar, Aug 15, 2012
    handlebar, Aug 15, 2012
    #3
  5. Aug 15, 2012 #4
    M818

    M818 Light Load Member

    286
    147
    Apr 27, 2011
    Dallas, Texas
    0
    It may be what is called "load dump" in the automotive industry. In 12V system, load switching like starting can cause up to 60V spikes. More for 24v systems.
     
    M818, Aug 15, 2012
    M818, Aug 15, 2012
    #4
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