CB Radio/antenna issue

Discussion in 'CB Radio Forum' started by tedd, Jan 15, 2020.

  1. tedd

    tedd Bobtail Member

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    Nov 20, 2019
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    Hello all and thanks for your assistance. Please allow me to provide all of you the following parameters I received after many attempt to tune my antenna taking into consideration all of you comments:

    Here are my current parameters after tuning antenna:
    1. Channel 1=1.5
    2. Channel 40=1.3
    3. Channel 19=1.5
    4. Channel 20=1.5
    Note 1: The needle on my internal SWR meter stays at 1.5 on channels 1-20.
    Note 2: The needle on my internal SWR meter begins to fall from channel 21-40. Approx. 1.5 for channel
    21 to 1.3 on channel 40.
    Note 3: When I key the mic, the RX/TX turns from Green to Red. The antenna Red light indicator light does not come on when I key the mic from channels 1-40.

    I believe I have a good SWR for channels 1-40. Please examine the parameters and let me know if I am ok and within tolerance and that I have a tuned antenna and can use my cb radio I do not want to damage my cb radio but I want to be able to transmit at least the 5 miles.

    Please tell me what you think and again thanks for your assistance.
    tedd
     
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  3. Ubu

    Ubu Road Train Member

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    Looks fine.
     
  4. craig_sez

    craig_sez Road Train Member

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    Look up a process called bonding...Thats likely an issue...
    Follow this pic to see how well ant is grounded.. 1476540202611_zps9kkgfdxe.png


    I think that because the radio is able to transmit more of its power with lower swr the ant set up is affected cause of its inability due to ant set up and setting off the light...
    Could also be a junk ant stud or moisture ..
    On a low power radio like that a perfect 1 vs a 1.5 means squat power wise,1/4 of a watt maybe..

    Bonding
     
    Last edited: Jan 18, 2020
    JerseyBarrierRacer Thanks this.
  5. Meteorgray

    Meteorgray Heavy Load Member

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    The radio and antenna seem to be working well. Any SWR from 1.5 or below is considered good.
     
  6. craig_sez

    craig_sez Road Train Member

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    I still think its a possible ant issue of sorts...Unless that ant light is overly sentitive then as radio sees a better match and allow more power to go through the issue presents itself....
    I remember yrs ago i discovered that when i turned up my dyna mic on my cobra that the ant light would flicker the louder i got..
    It was antenna related then but dont remember exactly what..
     
  7. Meteorgray

    Meteorgray Heavy Load Member

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    It sounds like the antenna light no longer comes on when transmitting. I got confused from the OP's last report, when he said that one light changes from green to red light when the mic is keyed, but then he says the antenna red light itself does not come on when transmitting on 1 to 40. So, it sounds like the antenna light is no longer reporting any problem, and nor does the SWR meter.
     
  8. craig_sez

    craig_sez Road Train Member

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    Yeah the tx/rec light changes when listening vs txing..
    Ant light is seperate....Still just adjusting the ant is killing the ant light,nope..Something i think is just affecting out put to some degree...Likely ant grounding to some small degree
     
  9. tedd

    tedd Bobtail Member

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    Nov 20, 2019
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    My goodness...you all are so gracious to to have an interest on my behalf. And the extent of your knowledge and recommendations are well taken. With your assistance, I have become very educated and feel confident that you all have put me on the right track for troubleshooting and tuning my antenna. By the way, my new antenna is mounted in about the center of the roof with a magnet mounted TRAM 300 antenna. The coax is routed through my back truck window to the cb radio under my dash. The slack of the cable is wound in a figure 8 configuration.

    Following recommendations, I raised the antenna very slightly. I was able to get a lower SWR on channel 20 to about 1.3 from 1.5 and on channel 40 from 1.3 to barely above 1.0 when I key the mic. Channel 1 moves up slightly. However the RED antenna light comes on from channels 9-40 but does not come on from channels 1-8 when I key the mic. Please note that the antenna light does not come on from channels 1-40 when the antenna is in the position before I raised it slightly.

    So I guess the question is: Is there a real difference in performance and range from 1.5 to 1.3 on channel 20 and 1.3 to barely above 1.0 on channel 40? If not, then I think I will return my antenna to its original position and not have the Antenna light come on. What do you all think? Am I good to go?

    As several of you suggested, the readings I currently have with the ANT light not coming on are fine and adjusting the readings would probably not make a lot of difference.

    Thanks again for your knowledge and recommendations. I believe I am getting there and possibly should leave well enough alone. Again what are your thoughts.

    Thanks in advance.
     
  10. Meteorgray

    Meteorgray Heavy Load Member

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    I'd run it so the antenna light does not flash a warning.

    Any SWR of 1.5 or below is fine. There is no significance difference. For example, a 1.5 reading means that the transmitted signal is about 96% going out and about 4% being returned. This is very common, is acceptable for the radio since it is built to take it, and means no discernable difference to those receiving the signal relative to the ability to hear what you're saying.

    A lot of folks will chase that SWR rabbit for many miles in an effort to get to Zero SWR, or "perfection". It can cost a lot of time and money to get there, and many if not most never really get there. The rewards might be internal satisfaction to the operator, but there won't be any substantial benefits related to the radio, antenna or their performance or longevity.
     
    Last edited: Jan 20, 2020
  11. DaNerkey

    DaNerkey Bobtail Member

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    Apr 2, 2021
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    I am still using a Radio Shack meter I bought in 1988.
     
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