cobra 29 ltd wx question

Discussion in 'CB Radio Forum' started by artek, Oct 25, 2018.

  1. artek

    artek Light Load Member

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    i have an older 1996 cb with 2 knobs for SWR CAL (inner and outside knobs).

    anyone know what is the difference between them?

    the swr meter needle does not work/move so i am unable to experiment with the knobs.

    2018-10-25 20.14.49.jpg
     
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  3. Mr.Mongo

    Mr.Mongo Bobtail Member

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    Did you buy it new? Looks like an echo set up to me...
     
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  4. BTShepp

    BTShepp Blue Demon

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    Yeah I bet you have an echo board in there. Do you have talkback? If not ask for a radio check with it on. If it’s too high I’m sure they’ll let you know.
     
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  5. Stinky Dairy Air

    Stinky Dairy Air Light Load Member

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    Inner is used to fine tune and if I remember right, the outer is used for adjusting
     
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  6. BTShepp

    BTShepp Blue Demon

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    Inner is the volume of the echo, whereas outside is the delay.
    For a nice reverb sound, outer knob should be pretty far counterclockwise. Volume (inner) also should be quite low. Too piss people off, keep ‘em both open. Please don’t do that though.
     
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  7. BTShepp

    BTShepp Blue Demon

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    While I understand why radio purists don’t like echo, I personally don’t mind a little on CB. It doesn’t add signal strength or make you walk over other stations. It does make your otherwise normal transmission sound more pleasant when set quite low and fast. This is called reverb. Music producers have done this since the 50s. Most people don’t listen to Johnny Cash and think, “wow, nice echo!” But if you go back and listen you’ll notice it now. The point isn’t for an echo effect. The point is far a warmer sound, like an orchestra in a large—aka live—hall.
     
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  8. BTShepp

    BTShepp Blue Demon

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    I’ll add that even some classical orchestral recordings have added reverb in the production stage. Anti-echo people often claim echo is too annoying unless it’s low, and when it’s low enough, it might as well not even be there. I disagree. When it’s low enough, it warms the sound. It’s not so much about continuing your speech as it is about constructing with it. When it’s too high, then it’s annoying.
    I do love a clean radio without echo as well.
     
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  9. BTShepp

    BTShepp Blue Demon

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    I’ve never seen an echo control where the SWR knob was. But I guess it’s the best option on that radio. Besides you could just get an external SWR meter.
    I wouldn’t be surprised if Cobra put delta tune on some of their models solely to make them more attractive to mod. I mean that control is useless on an AM only radio. They know it’s going to be replaced with echo.
     
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  10. artek

    artek Light Load Member

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    Tested on PA, the inner knob is indeed echo.

    Thanks all
     
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  11. Ridgeline

    Ridgeline Road Train Member

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    Ok most likely the person who hacked it up disconnected the swr adjustment because they used a pot with a rating for the mod they put in. You may have a variable output and an echo both on the same knob.

    The only way to find out is have it looked at by someone who knows what they are doing.

    The original radio came with one knob for swr adjustment.
     
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