Top Load, Center Load and Bottom Load CB Antennas.

Discussion in 'CB Radio Forum' started by VA_Bowman, Sep 19, 2011.

  1. VA_Bowman

    VA_Bowman Bobtail Member

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    Sep 18, 2011
    Farmville, Virginia
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    I am looking to mount a CB in my 98 Cherokee. I have a Radio Shack/ Cobra 29 radio. In my big truck I have a 29 Classic with the stock coaxial cable and a 48” Fire-Stick. Sometimes this set up gets out pretty good and sometimes I can see the truck I am trying to talk to and they can barely hear me but I can hear them just fine. Most of the other drivers I run with use Wilsons because they tell me they work better in the woods.
    I know that I need to purchase the best coaxial I can afford. I will be using the Radio Shack/Cobra 29 and I have several fiberglass antennas but the one that I would like to use is a 24” Fire Stick I ask this question knowing that the Fire Stick is a top load and most Wilsons are either Center or Bottom loaded. Can I mount this Fire Stick into a Wilson base and have good results?
     
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  3. OFTOTR

    OFTOTR Medium Load Member

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    Do you know what 'loading' is?
     
  4. VA_Bowman

    VA_Bowman Bobtail Member

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    Sep 18, 2011
    Farmville, Virginia
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    I am guessing that it is where the signal loads into the antenna.


    I am guessing that it is where the signal loads into the antenna / coil. Oh yeah and I do realize that my Fire Stick is a continuous load type because the coil is wound over the length of the whip. I guess I should have simply asked if using two different types of coils together will work.
     
    Last edited: Sep 19, 2011
  5. WA4GCH

    WA4GCH Road Train Member

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    " 24” Fire Stick ":biggrin_25513: Sorry but I would not run a antenna that short.
     
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  6. Big_m

    Big_m Heavy Load Member

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    Central Maryland
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    If it were me I would not run any antenna under 4 ft.
     
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  7. VA_Bowman

    VA_Bowman Bobtail Member

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    Sep 18, 2011
    Farmville, Virginia
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    The reason that I chose the 24” is to avoid damaging it while off road. I have read that as long as two thirds of the antenna is above the roofline that it would be ok. Where I am mounting it is on the front of the roof rack so all of it will be above the roofline I have read that the 24” covers the same bandwidth as a 120” whip. The difference is one antenna surface is straight and the other is wound around a fiberglass rod. I am basing this on what I have read online. I can’t find anything at all about combining coils. If I am heading down the wrong path please let me know so, along with details as to why what I have read is wrong. Thanks!
     
  8. VA_Bowman

    VA_Bowman Bobtail Member

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    Sep 18, 2011
    Farmville, Virginia
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    " 24" Fire Stick ":biggrin_25513: Sorry but I would not run a antenna that short.

    If it were me I would not run any antenna under 4 ft.

    Can either of you tell me why? Is this just your preference?
     
  9. WA4GCH

    WA4GCH Road Train Member

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    EASY answer a 1/4 wave is about 9 foot as you shorting it is becomes less effective. Below 4 foot there is little length left to radiate or receive signals ...
     
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  10. VA_Bowman

    VA_Bowman Bobtail Member

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    Sep 18, 2011
    Farmville, Virginia
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    Thanks. I have read about 1/4 wave being optimal. I can’t help but wonder how a hand held CB with a four or six inch wound whip would ever work. I had this 24” antenna mounted to the top of my van and it worked fairly well. I had no problem talking to folks a few miles away. Then I think about my T800 with dual 48” whips and the problems I have talking to other rigs that I can see. I’m guessing that problem must be in a connector, coaxial or ground plane.

    I hope that you can tell that I am in no way trying to argue with anyone I am simply trying to learn about something that I know very little about.
    Thanks for your help!
     
  11. Hardlyevr

    Hardlyevr Road Train Member

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    The walkie talkie type CBs do very poorly, like you have to be practically right next to somebody for them to hear you.

    I've always had better luck with top loaded antennas. But if all of whatever you mount will be on top of everything else, you will probably get decent results with even a base loaded antenna.

    But what you DON'T want to do is mix and match different antenna systems together, as each one is designed for the total length of it's own system. Combining 2 will result in a different working length, which will be wrong.
     
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