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  1. #16
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    Default Re: How did you wire in your CB Radio?

    Quote Originally Posted by downsy View Post
    I missed this part. 14 gauge will work just fine. CBs don't draw a lot of power even when transmitting. 4 watts at 12 volts is something like 1/3 of an amp. You could actually run smaller than 14 gauge but I basically run everything with 14 gauge just because it covers nearly any load you will use on a Jeep short of an Inverter or something like that.
    Remember that Common mode noise, (Noise on both ground and power) is even worse when one of the power leads has more voltage drop than the other!
    I work with Power supplies for a living, I design them to avoid this very thing!

    14 awg wire, 90" long,
    from battery to radio with 1 amp draw (remember, not all of the power going to the radio is turned into RF power, the lights, receiver, etc...)
    would have a 0.02 volt (185.27 ohms) drop every time you keyed up.

    This is also making the alternator noise, ignition noise, etc, that much louder
    as they are now that much more diferent than ground! See how that works?
    The other thing you can do is twist the ground & power wires together between the battery and the radio. this couples the (EM) fields created by the voltage going through the wires & creates a shield of sorts from magnetic noise (EMI) by the way just the insulated part of the wires, not the bare copper! See how easy that was?
    Don't forget to fuse AT THE BATTERY!
    Bob, KJ5XJ
    1992 XJ
    4.0L, AW4, NP231, Bridgestone All terrain LT 32"
    Safari Rack, Bushwacker flairs, Bed-liner for paint
    Yup! That's my Beautiful baby!
    If you're not on ...

  2. #17
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    Default Re: How did you wire in your CB Radio?

    Quote Originally Posted by xjzaped View Post
    I'm honestly afraid for how you have that antenna mounted...I'll probably wake up in the middle of the night worrying about that one, and it's not even on my own Jeep.

    For mobile application (roughly 20 feet of feedline) the difference between RG-58, RG-8X and LMR195 is less than .5 dB of attenuation as far as CB is concerned. You actually have more signal loss in a SO-239 connector at 27 MHz than you do a 20 ft run of RG58.

    Assuming that any transmitter is 100% efficient, is pretty far off. General rule of thumb when dealing with communications equipment, 25% efficiency if you don't want to take the time to measure it out yourself. That being said, a CB will draw somewhere more along the lines of 1.5A.

    As far as the antenna mount goes, I like NMO on the hood channel of Jeeps if you are afraid to drill. I prefer NMO on the roof but if you want to keep an eye on what your bashing what may be an expensive antenna against on the road/trail it's hard to beat a hood channel mount.

    Powering radios is always an interesting discussion. Two schools of thought when running off the battery.
    1) Leads directly to the battery terminals. This is a great option if you fuse both leads. Horrible option if you only fuse the positive lead.

    2) Positive lead to the battery and negative lead to the chassis ground. This method only needs the positive lead fused.

    Other than that, installing radio equipment is fairly straight forward.
    That right hand connector is not the "behind the rig" type but one designed for a anttenna mount.
    here is a poor shot of mine minus the aluminum plate, have a steel plate there for the interim...
    Click image for larger version. 

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    See how lovely?
    Bob, KJ5XJ
    1992 XJ
    4.0L, AW4, NP231, Bridgestone All terrain LT 32"
    Safari Rack, Bushwacker flairs, Bed-liner for paint
    Yup! That's my Beautiful baby!
    If you're not on ...

  3. #18
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    Default Re: How did you wire in your CB Radio?

    Quote Originally Posted by OldFaurt View Post
    That right hand connector is not the "behind the rig" type but one designed for a anttenna mount.

    here is a poor shot of mine minus the aluminum plate, have a steel plate there for the interim...

    Click image for larger version. 

Name:	Anttena.jpg 
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Size:	24.0 KB 
ID:	7433



    See how lovely?

    Too much work. Much simpler just to use an NMO mount. Drill or punch 3/4" hole (unless you're using a 3/8" or 1/2" mount), wipe he exterior surface down with a damp tag or acetone, feed the coax in, assemble the mount making sure the o-ring makes solid contact to the sheet metal and snug the top down. Add the antenna and your done outside. You now have two or three, depending on the antenna, seals around the hole you drilled. No reinforcement or additional weather sealing needed.


    Sent from my iPhone using Tapatalk

  4. #19
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    Default Re: How did you wire in your CB Radio?

    Quote Originally Posted by xjzaped View Post
    Too much work. Much simpler just to use an NMO mount. Drill or punch 3/4" hole (unless you're using a 3/8" or 1/2" mount), wipe he exterior surface down with a damp tag or acetone, feed the coax in, assemble the mount making sure the o-ring makes solid contact to the sheet metal and snug the top down. Add the antenna and your done outside. You now have two or three, depending on the antenna, seals around the hole you drilled. No reinforcement or additional weather sealing needed.


    Sent from my iPhone using Tapatalk
    You must use a much shorter antenna than I do.
    Even with the backing plate my roof flexes.
    after 30+ years of CB and Ham radio mobile installations,
    I know what has worked for me. Your description sounds like a very good install,
    but I have never been overly plused by NMO mounts.
    My luck has been they tend to corrode more so than 259 types.
    Bob, KJ5XJ
    1992 XJ
    4.0L, AW4, NP231, Bridgestone All terrain LT 32"
    Safari Rack, Bushwacker flairs, Bed-liner for paint
    Yup! That's my Beautiful baby!
    If you're not on ...

  5. #20
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    Default Re: How did you wire in your CB Radio?

    I tend to avoid brass NMO mounts and use Larsen's high frequency mount. I avoid pretty much anything not made for the LMR market for the specific reason of it fully encapsulates the mount (most antennas made by comet or other non-american companies don't) eliminating oxidation and they have moat of their mass at the base of the antenna to minimize the moment transferred to the roof.

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