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Add a modulation meter Cobra 148 or Grant XL

Discussion in 'CB Radio Modifications' started by LeapFrog, Nov 25, 2017.

  1. LeapFrog

    LeapFrog
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    Vocoder Frog

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    Here is a file I found online to explain the process. Looks like it came from a "secret CB" book, but I'm not sure.
    Enjoy
    73


     

    Attached Files:

    tecnicoloco likes this.

  2. Onelasttime

    Onelasttime
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    Is the modulation/rf pwr/swr meter in the unit broken? They make inline unites too. Why do you want to do this? R you just board? Just wondering? My one son is legally blind without his glasses so I can see how some might want a larger display/ I am not one that likes to watch the pretty needle bound around so it would be wasted on me. To be honest I would probably get a Dosey Meter if I wanted to have a large modulation meter to look at and they go inline with the feed line and have other functions as well. They are relative after all not at all absolute. R you doing hifi, direct inject or something. similar?
     
  3. LeapFrog

    LeapFrog
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    Vocoder Frog

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    This is an old modification.
    The Cobra 142 has a modulation meter and the original Grant has one (not the Grant XL or 148 GTL)

    My Grant XL is not modified, but yes the meter would just be something to look at.
    I had the idea of turning my Grant XL into a base station, with a dedicated/built-in mod meter; but never got around to it.
     
  4. Onelasttime

    Onelasttime
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    Oh I hope I did not offend you. I was not trying to be negative but after re-reading my post I thought I had better apologize. I do not mind offending people on purpose but hate to do it on accident.

    Sorry if I came off negative or rude!

    I was just wondering why you wanted to do it. Sometimes people climb a mountain just because it is there and other times it is because it is the only way to get to the other side! LOL

    I have to admit that while I have never owned a Galaxy Radio and likely never will I always thought their large meter was a good idea. ALso if I did not already own a decent SWR/Power Cross needle meter the Large MFJ meter likewise makes sense. I am 44 now and used to have crazy insane eyesight but now one eye is 20/40 and not going to get any better as I age so I can understand wanting a biger meter.

    When you said modulation meter I was not thinking about a separate modulation meter in my mind I was thinking that you wanted to add a Super Sized multipurpose modulation/swr/rf pwr meter. Now I understand. The Madison had that to right separate meters instead on one meter and a switch for different readings?
     
  5. LeapFrog

    LeapFrog
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    Vocoder Frog

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    It is okay OneLastTime, I didn't get too offended! At first I was thinking "what is wrong w/ the one in the radio??" what one, in the radio!

    My idea was to make the Grant XL have more meters and knobs than a Dak!
    But I never got to making the radio into a base station.

    I think one could still use the stock meter and just change the function with a multi-switch. Or a stand-alone meter who's only purpose was Modulation reading, that would be cool too.

    I don't have a practical use beyond having something to watch for an indication of audio, that way I can immediately see if i'm having mic issues.
     
  6. 711

    711
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    I’m sure you already knew this but all it is , is a detector circuit. Most time it’s picked off the darlington and adjusted for 100% mod. Can be added to any radio, regardless of the radio.
     

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