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Thread: CB Myths

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    prerunner1982's Avatar
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    Default CB Myths

    As with any hobby myths taken as fact are present.

    There are two common myths that would apply to someone wanting to install a CB into their Jeep.

    1st: And probably the most common is that you HAVE to have 18' of coax. You only NEED enough coax to get from your radio to your antenna. If that is 18' then great... but if 10' or 3' will do there is no need for the rest. The reason 18' is usually suggested is because it most easily tricks your SWR meter (used for tuning the antenna) to show that you have a good match and efficient antenna when in actuality your antenna is not any more efficient you are just tricking the meter to tell you so. Trimming the coax to change the SWR is doing the same thing. You tune your antenna for best SWR not the coax. Coax just allows your signal to get from your radio to your antenna... nothing more. To me this myth is like saying you need a certain length of hose depending on PSI or a certain length of wire depending on amps.

    2nd: Don't coil your coax. Coiling coax is commonly used by radio operators using much more power and much better antennas than you will use/find on your or your buddies Jeep. It's called a Choke and it helps prevent stray signals from travelling down the coax. I wouldn't purposely build one into your CB radio but if you have some extra coax it shouldn't hurt.

    I run some odd length of coax, something around 14' and have coiled the extra... with a 1.1-1.2 SWR and 2.5 watts and 102" I have no problems "getting out".
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    Default Re: CB Myths

    It's also a myth that rocking the steering wheel back and forth while talking ingresses signal strength
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    Default Re: CB Myths

    RIP James Best. I have my antenna mounted between the fender and hood and the 9' of cable is just right as far as length and do great when transmitting and receiving.

    The two other myths or issues would be antenna mount and antenna related.

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    Default Re: CB Myths

    Quote Originally Posted by tinythexj View Post
    The two other myths or issues would be antenna mount and antenna related.
    What myths are you referring to?
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    Default Re: CB Myths

    I was told by a guy that has a cb business that you need the 18' of coax, and it needs to be bundled in a long oval and tied down along the inner fender. The antenna has to mount on the driver side of hood because the signal rotates in a clockwise direction and needs to bounce off the hood. He put the meter on it and told me I was good to go. I had a better cb in the past w/duel antenna, installed it myself w/coiled coax and it worked great. Now I have a Cobra 19dx, single fender mount antenna and I'm not happy w/it. Should I cut and coil my coax? Or get a better cb? I don't have a meter to check it with, and I don't want to go back if the guy is just full of it.

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    Default Re: CB Myths

    He was full of .

    The best place for the antenna is on the roof.. I have mine on the drivers rear taillight. Fender mount works too, but anything other than in the middle of the roof is a compromise. (mag mount on roof isn't really better due to the mag mount).

    The signal radiates from a vertical antenna in all directions, can't say I have ever hear the whole clockwise rotation explanation though.

    If you have 18' of coax it's fine, but it's not required. If you feel comfortable cutting and soldering on a new end go for it. It will give you less excess to hide/deal with. PL-259s can be tricky to solder though, too hot and you melt the insulation inside.

    As far as your Cobra 19DX (same radio I use by the way) I would hook a SWR meter up to it first. The mount may need to be cleaned or grounded or the coax could be damaged/bad which would cause the SWR to be quite high and the performance of the radio to be quite low.
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    Default Re: CB Myths

    Quote Originally Posted by WAS95X View Post
    I was told by a guy that has a cb business that you need the 18' of coax, and it needs to be bundled in a long oval and tied down along the inner fender. The antenna has to mount on the driver side of hood because the signal rotates in a clockwise direction and needs to bounce off the hood. He put the meter on it and told me I was good to go. I had a better cb in the past w/duel antenna, installed it myself w/coiled coax and it worked great. Now I have a Cobra 19dx, single fender mount antenna and I'm not happy w/it. Should I cut and coil my coax? Or get a better cb? I don't have a meter to check it with, and I don't want to go back if the guy is just full of it.

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    Default Re: CB Myths

    Quote Originally Posted by prerunner1982 View Post
    He was full of .

    The best place for the antenna is on the roof.. I have mine on the drivers rear taillight. Fender mount works too, but anything other than in the middle of the roof is a compromise. (mag mount on roof isn't really better due to the mag mount).

    The signal radiates from a vertical antenna in all directions, can't say I have ever hear the whole clockwise rotation explanation though.

    If you have 18' of coax it's fine, but it's not required. If you feel comfortable cutting and soldering on a new end go for it. It will give you less excess to hide/deal with. PL-259s can be tricky to solder though, too hot and you melt the insulation inside.

    As far as your Cobra 19DX (same radio I use by the way) I would hook a SWR meter up to it first. The mount may need to be cleaned or grounded or the coax could be damaged/bad which would cause the SWR to be quite high and the performance of the radio to be quite low.
    Remember every inch of coax is loss of signal strength and loss of power to the antenna.

    Antenna placement depends on what you're trying to accomplish.

    Center metal up high is a general all purpose to mount for a mostly spherical radiation and reception pattern. If you're doing a lot of highway driving and you want to "aim" your signal down the highway, rear passenger is best. The effect is only slight but the effect is real.

    Dual antennas are generally used on 18 wheelers since they have large reflective surfaces behind them, a.k.a. trailers. The antennas on both sides help them transmit equally on both sides of the truck/trailer. They will have a "dark" spot on transmit and reception from the trailer.

    I knew this one guy that had phased whips and a little box that allowed him to adjust the phasing. He was able to use it to tune the direction of his receive and transmit. Basically an electronically controlled directional beam antenna system.

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    Default Re: CB Myths

    Thank you Jon, that's a big help! Dose the meter box do the adjusting? would a radio shack meter work? Tony I haven't had a cb for a while, but that's about how I felt talking to him. I'll try to post the info he gave me, it's pdf and has his info is on it.
    oops.
    [IMG]File:///C:/User/Tim/Documents/CB%20installation.Pdf[/IMG]
    Thanks again.

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    Default Re: CB Myths

    Thanks Mudderoy, If that's the case then I can get rid of 10-12 feet of coax. I just need to know how to tune it first be fore I start cutting. I'm going camping in the next day or so and would like to do this before I go. My to do list keeps getting longer.

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    Default Re: CB Myths

    Quote Originally Posted by WAS95X View Post
    Thank you Jon, that's a big help! Dose the meter box do the adjusting? would a radio shack meter work? Tony I haven't had a cb for a while, but that's about how I felt talking to him. I'll try to post the info he gave me, it's pdf and has his info is on it.
    oops.
    [IMG]File:///C:/User/Tim/Documents/CB%20installation.Pdf[/IMG]
    Thanks again.
    I see you log on to your Windows 7, or later PC as Tim.

    That link won't work for anyone on the Internet. The file has to be copied to a server that SHARES the file to the Internet.

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    Default Re: CB Myths

    I still have a lot to learn. I'll take a pic of it and see if I can get that to work.

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    prerunner1982's Avatar
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    Default Re: CB Myths

    Quote Originally Posted by WAS95X View Post
    Thank you Jon, that's a big help! Dose the meter box do the adjusting? would a radio shack meter work?
    The meter just does the metering, you do the tuning at the antenna. Radio Shack meter will work fine.

    Quote Originally Posted by WAS95X View Post
    Thanks Mudderoy, If that's the case then I can get rid of 10-12 feet of coax. I just need to know how to tune it first be fore I start cutting. I'm going camping in the next day or so and would like to do this before I go. My to do list keeps getting longer.
    What kind of antenna do you have? Some have a tuning "knob" under a cap at the top of the antenna, some you adjust by loosening a set screw and moving the metal part of the antenna up or down and then tightening the set screw, some you actually have to cut the antenna.
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    Default Re: CB Myths

    Here's a pic of the info I was given.
    Last edited by GoneWithTheWind; 08-21-2015 at 02:42 PM.

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    Default Re: CB Myths

    The antenna is a Tiger Everhardt. would the ideal swr be 1.1-1.2 ?
    Last edited by GoneWithTheWind; 08-21-2015 at 03:04 PM. Reason: I have another question.

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