Cobra 29 classic shows antenna error light when Installed in CB "cubby" of Freightliner M2

Discussion in 'CB Radio Forum' started by mikejohnsonsound, Jan 17, 2022.

  1. mikejohnsonsound

    mikejohnsonsound Bobtail Member

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    Jan 17, 2022
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    Hi all,

    I have Freightliner M2 that I have a Cobra 29 Classic installed in. I have the SWR calibrated using an external Astatic SWR meter. Truck running windows closed. . . etc. The SWR is around 1.2-1.4. The issue I have is every time I put the CB in the cubby and key the mic I get the Antenna warning light. I pull it out and everything is back to being as it should be. I don't have an issue with mounting the CB on the dash but would prefer the cleaner look of having it mounted in it's "cubby". Any thoughts as to why this would be occurring?

    Thanks!
     
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  3. gummy bear

    gummy bear Light Load Member

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    If you've confirmed the SWR is good with the radio in the cubby, you can always adjust VR6 to get rid of the antenna warning light.
     
  4. ESAFO

    ESAFO Light Load Member

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    Jan 2, 2022
    Hubbard, Oh
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    I have same issue with my 29 in upper compartment in a Pete, have been running this way for a couple of yrs now.
    I know in my truck there is alot of electrical crap up there & was told it's probably due to that, radio checks out just fine & was never told it sounded like i had any issues.
    So as long as your running a good coax, antenna & radio has been peaked & tuned, from my experience you should be just fine run it & see if anyone says you sound muffled or distant.
     
  5. 062

    062 Road Train Member

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    Are you coiling the coax tightly to make it fit?
    I would check a few things before calling it good. Make sure the connections are tight at the back of the radio and wiggle/bend the coax while keyed up to see if it happens.
     
  6. mikejohnsonsound

    mikejohnsonsound Bobtail Member

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    Jan 17, 2022
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    I know there is quite a bit of electrical up there as well. Map lights, running lights on the sun visor. . etc. I assumed that would be a contributing factor. I went so far as to shield the electrical stuff from the radio and coax cable, but to no avail. The one thing I didn't do was check SWR while to CB was in its compartment. All the swr checks were done with it sitting on the dash. I will double check all of that in the next day or so and let you know what happens. Thanks for the tip.

    Mike
     
  7. mikejohnsonsound

    mikejohnsonsound Bobtail Member

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    Jan 17, 2022
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    Connections are all as tight as I can get them without grabbing a pair of pliers to really yard down on them. As far as coiling, I was led to believe you didn't want to coil at all as that would contribute to problems. I have taken the excess and zigzagged in the upper compartment. Is this the wrong thing to do?

    Mike
     
  8. mikejohnsonsound

    mikejohnsonsound Bobtail Member

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    Jan 17, 2022
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    The warning light is just that, a warning light. If I decide not to open up the radio it won't hurt to leave it be, correct?

    Mike
     
  9. ESAFO

    ESAFO Light Load Member

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    Hubbard, Oh
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    Should be ok like I said mine comes on & has for yrs, as long as people can hear you clear then my guess us you'll be fine.
     
  10. Timin770

    Timin770 Road Train Member

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    I bet radio and or coax is getting too near other circuitry in or near the cubby. My bet is on the coax.
     
    Last edited: Jan 19, 2022
  11. Ridgeline

    Ridgeline Road Train Member

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    Let’s start with the basics, my first question is how old is the coax and what kind of connection is on the end of the coax?

    then my second question is this, how much clearance between the radio and the front of the ‘cubby’?
     
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