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cb radio whats necessary?

Discussion in 'Ham Radio - CB - Trail Communications' started by big5dogg, August 8, 2008.

^^Searches ExplorerForum.com^^





  1. big5dogg

    big5dogg Active Member

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    hey dude i hooked mine up and signal is perfect when the car if off but with i start the car up i cant really hear what other people are saying i even tuned my antenna up have any idea whats going on??
     
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  3. Tbars4

    Tbars4 Moderator Emeritus Elite In Memoriam

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  4. Donner

    Donner Explorer Addict

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    Tune help please... I have to do this in two parts:

    Okay, the SWR from Radio Shaq :) has two adapters on the back. So the antenna and cb are to be hooked up at the same time to their respective source on the back of the box?

    Also: Range Function Mode (which to pick?)

    Thanks (I'll be back with the second part after)!
     
  5. Tbars4

    Tbars4 Moderator Emeritus Elite In Memoriam

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  6. Donner

    Donner Explorer Addict

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    Thanks tbars! The instructions got misplaced... I'll run this and then put up the pics. Thanks!
     
  7. Donner

    Donner Explorer Addict

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    Okay, bad news is I'm missing a cable... I'll have it tomoro;
    And the fuse coming from the battery, should it be 15 or 20 amps? I have 20, but I haven't use it yet, I could put in a 15 if necessary.
     
  8. rizzjc

    rizzjc Scubajoe - Radio Mod Staff Member Moderator Elite Explorer

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    For a cb, either 15 or 20 amp is more than enough.
     
  9. Donner

    Donner Explorer Addict

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    Excellent! I'll stick with the 20. Thank you :)
     
  10. Sandy

    Sandy Well-Known Member

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    Donner,

    If the Power Line is just for a CB then stick to 5 amp fuse, close to the battery.

    The CB will draw no more than 3 amps on transmit so 5 amps will cover it, a couple more amps maybe but a 20 amp is too big.
    If the CB should short out for some reason, by the time the 20-amp fuse blows the CB will be on fire, so smaller is better.

    If this power line from the battery is for more than the CB running 20 amp fuse is good but you will need to fuse each of the lower draw components accordingly.
    Also, if you do run a 20 amp fuse the wire that you are using needs to carry at least the 20 amps maybe a little higher.
    Run 12 ga wire, 14 minimum gauge for the 20 amp fuse.

    You should always fuse no larger than the smallest component of the circuit, i.e. wire is 16 ga then 10 amp should be the fuse size, 14 ga wire 15 amps should be the fuse size 12 ga for 20 amps; these are conservative numbers but they will more than cover the amperage we are talking about.
    If the CB draws 3-amps max and the wire is 14-ga and there are no other components on this wire then you need to fuse for the CB, 5 amps max.

    Sorry if this is confusing but it is essential to have the correct fuse size for the circuit or a fire will result.

    Luck,
     
    Last edited: September 17, 2008
  11. rizzjc

    rizzjc Scubajoe - Radio Mod Staff Member Moderator Elite Explorer

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    Well, let's be clear here. I agree you don't need that large of a fuse. I don't agree that a fire would result. You *could* have a fire anytime, but just want you to be scared that you are going to have a fire just because you use a 20 amp fuse, 'cause that's just not so. And if you had a major short (i.e. the power and ground shorted straight together), they would blow a 20-amp fuse quickly. If you had NO fuse, then yes, you could have a fire (could), if you had a direct short.

    Sany is correct though, and I should have mentioned wire size.
     
  12. Gatorblazer

    Gatorblazer Active Member

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    Dumb question, but I have a Midland handheld that has the option of being connected to an attenea when its in the vehicle. Does it need to be tuned as well?
     
  13. Donner

    Donner Explorer Addict

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    Okay, this is great info, I used 14g wiring... I'll switch back to the lower fuse. Thanks guys! My antenna has a ground attached... If it's bracketed and grounded to the metal bumper, why does it need an additional ground?
     
  14. Sandy

    Sandy Well-Known Member

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    yes
     
  15. Sandy

    Sandy Well-Known Member

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    I won't get into a pi$$'g contest ... the point is to make sure the entire circuit is protected by the fuse. This applies to wiring an Off-Road set of lights, a CB or even a stereo.

    ltr,
     
  16. Sandy

    Sandy Well-Known Member

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    big5dogg,

    I didn't read the first part of the post, sorry for adding to the changed subject.

    Have you got your answer yet and are you all set ?
     
  17. Donner

    Donner Explorer Addict

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    His question is mine too... with the engine off, clear reception; with the engine on, there is more interference electrical than anything.
     
  18. rizzjc

    rizzjc Scubajoe - Radio Mod Staff Member Moderator Elite Explorer

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    Not trying to. You're right. Sometimes I'm just an "it'll work fine" kind of guy. Better safe and do it right though. :thumbsup:
     
  19. Sandy

    Sandy Well-Known Member

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    Noise in a Ford, fact of life, you will be able to reduce the noise some but never get rid of al of it.

    Start the vehicle, remove the antenna connector from the rear of the CB, turn on the CB if off, if the noise is still there then it is coming over the electrical system and can be reduce with add on but it is time consuming. If the noise goes away then the noise is coming in over the antenna and there isn't much you can do.

    Try re-routing the power lines away from computer area, re-route antenna coax and move the antenna around on the outside of the vehicle to get the smallest amount of noise.
    Ground the antenna mount to the frame, ground the tailpipe to the frame, ground the doors and the hood to the body of the vehicle using 1/4" braid minimum.
    There is a home made filter at the beginning of the forum but it will take some doing to get it in and it needs to be installed at the fuel tank area but word is it helps.
    Ford used to have a filter to install for the Fuel Pump Noise, I don't think it is still available.
    Learn to set the squelch knob to the threshold of the noise with the RF Gain to Max.
    There are way to add Capacitors to the leads of the electrical components that are making the noise but you need to pin point the components first.
    Noise reduction in itself is work but in a Ford it is a Science.

    Do you have both the red and black wires going to the battery for power ?
    Sometime twisting them 10 turns per inch helps; adding a braid over the wires and grounding the braid near the battery may help too.

    Luck,
     
  20. Maniak

    Maniak Moderator-Stock 91-94 Staff Member Moderator Elite Explorer

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    One thing to consider.. Noise is also related to the CB itself.

    I replaced a realistic CB with a Cobra 29 and the amount of fan and alternator whine and ignition noise dropped considerably.

    ~Mark
     
  21. Donner

    Donner Explorer Addict

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    I just picked up a Cobra replacing a Uniden a day or so ago... a bigger unit. I was told there are noise filters, but it sounds gimmicky. Do they really work?

    The cb has been grounded, regrounded, and 2x more in different locations away from the dash - still noisy. I tried direct battery hook up, but the battery or the vehicle became slow to start up.
     

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