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CB help PLEASE. High SWR

Discussion in 'Technical Chat' started by tmreyes1, Jun 17, 2012.

  1. Jun 17, 2012 at 12:26 PM
    #1
    tmreyes1

    tmreyes1 [OP] Well-Known Member

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    T-Rey
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    I know this topic has been beaten like a dead horse and I had read all the threads. Here is my situation

    I installed a Cobra 29LX with a 4 foot firestikII and spring mount. I mounted it to the bed rail behind the cab. I ran a ground wire from the bracket to the frame ground. I was not getting an accurate reading from the internal meter so I used a external swr meter. STILL well over 3 on the swr. I have tried different grounds an still nothing. I went wheeling over the weekend and was able to use it but wanna get it down befor I fry the radio. Everything was brand new and the coax cable is an 18 footer and not coiled up under the cab. The bracket and bottom of the mount have ground and the top where the spring goes does not so my plastic washer is doing its job. I am so tired of messing with it and no change at all. Please help
    Can post pics if it will help but right now kind of frustrated
     
  2. Jun 17, 2012 at 12:58 PM
    #2
    MonkeyProof

    MonkeyProof Power Top

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  3. Jun 17, 2012 at 1:28 PM
    #3
    LUSETACO

    LUSETACO Here for the Taco Pron

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    Did you try moving the antenna location? I would give that a shot. It's all process of elimination sometimes to figure out what is wrong. Also too long a ground wire can be an issue. Good luck and keep us posted.
     
  4. Jun 17, 2012 at 1:49 PM
    #4
    tmreyes1

    tmreyes1 [OP] Well-Known Member

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    I was using 18 gauge wire but also tested it with heavy duty cable and still no change. The ground wire is only about 3 feet long. From the backed to the frame which is just a bit longer tan the bed s high.
    I have not tried moving the antenna. If I do I will move it to the rear of the bed.
     
  5. Jun 18, 2012 at 4:14 PM
    #5
    tmreyes1

    tmreyes1 [OP] Well-Known Member

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    Well thank you for the replies. I went to a local CB radio shop today and found that I had a bad RF ground. If you hold the antenna base while checking the SWR and it reads good than that is your problem. Simple fix for this was to move the antenna to the driver back of the bed using the 2 10mm screws that hold the panels together. Mounted antenna and rechecked. 1.1 across the board. I did not even need to ground the antenna since I went into metal this time. I can post pics if anyone wants
     
  6. Jun 19, 2012 at 5:17 PM
    #6
    DDD

    DDD Shine bright like a hymen

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    So, your problem was the antenna location? or the ground method?

    I have a lil-Wilson magnet mount antenna I use on the roof of my truck and I have a SWR <1. But I tried using a 103 inch whip antenna I was given using a grounded mount on the bedrail. The SWR was over 3 after checking everything I went back to using the magnet mounted lil-wilson.

    You think mounting it to the rear of the bed will help?

    Post pictures of your new antenna location.
     
  7. Jun 19, 2012 at 7:30 PM
    #7
    tmreyes1

    tmreyes1 [OP] Well-Known Member

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    Here is my new location. Even with the antenna down I was getting a 2 on my SWR. With the new location being on the metal part of the deck I did not have to run a ground. My SWR was 1.1 without tuning the antenna. There is no doubt that the new location fixed my issue. A trick to check a high SWR is to grab the antenna base while hooked up to your meter and key up. If the reading is good while you are holding the base you have a bad RF ground and need to move the location.

    Ant.jpg
     
  8. Jun 19, 2012 at 7:33 PM
    #8
    CayucosTacoma

    CayucosTacoma Just think outside the Yota

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    I made a thread about this a while back. Look through some of my previous threads
     
  9. Jun 19, 2012 at 7:35 PM
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    CayucosTacoma

    CayucosTacoma Just think outside the Yota

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