Question about Cobra Radio Communications

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Cb problem have a cobra 19dx iv with a 2ft magnet mount cobra antenna swr is good, receive is good, but muffled output

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  • sunyjim Aug 02, 2009

    So took the mic to a very unhelpful cb shop, at least confirmed it was ok. Completely unwilling to suggest anything else though.
    My next suspect was the antenna. The radio and mic were new. I know i hooked up to good power coming off the back of the cig. lighter, so the antenna I got from my father in law was the next suspect. So I bought a new lil wil antenna with the intentions of taking it back if it didn't work. WOW does it work, clear with awesome reception. I figure the actual issue was the cable, after confirming it was working with the new antenna I learned of father in laws old habit of closing the window on the antenna wire. I suspect it's just crappy inside, and am suprised the SWR came out ok with it as it was

  • sunyjim Aug 02, 2009

    So took the mic to a very unhelpful cb shop, at least confirmed it was ok. Completely unwilling to suggest anything else though.

    My next suspect was the antenna. The radio and mic were new. I know i
    hooked up to good power coming off the back of the cig. lighter, so the
    antenna I got from my father in law was the next suspect. So I bought a
    new lil wil antenna with the intentions of taking it back if it didn't
    work. WOW does it work, clear with awesome reception. I figure the
    actual issue was the cable, after confirming it was working with the
    new antenna I learned of father in laws old habit of closing the window
    on the antenna wire. I suspect it's just crappy inside, and am suprised
    the SWR came out ok with it as it was


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  • Master
  • 6,966 Answers

Hi and welcome to FixYa,

Which output is muffled, transmit (modulation audio) or receive audio?

If you are referring to the receive audio, initially, have you tried an external speaker? If it works good, then it would be an internal speaker problem; if not then others to check would be:

  • IC1 - KIA7217AP audio IC;
  • CM 10 & 15 - audio output capacitors 470uF / 16V.
if it were transmit / modulation audio, try replacing the mic.

Please postback updates.

Good luck and thank you for asking FixYa.

Posted on Aug 01, 2009

  • Louie  Role
    Louie Role Aug 02, 2009

    I understand and appreciate the update. Magnetically mounted antennas are always compromised on SWR since the ground plane is not electrically grounded. There is a matcher that would result to a low SWR even if in reality, the radio is splattering all over even to itself.

    Still, glad that things worked out.

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