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Old 04-19-2012, 09:37 AM
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Any reason why this wouldn't work OK?

I am a complete CB newb and am just trying to communicate with my buddies on the trail. I have tried it out and it seems to work fine, but getting a scond opinion on if i should change something would be nice. It is hard to see but its basically a 1"x1" stock tube steel that i cut into an angle bracket. I then bolted it to the gate using the bolt that holds the tire carrier on. On the antenna end i just opened up the existing hole a bit and mounted a stud in it with a 4ft antenna and then ran the wires along the lip that the soft top fastens to.

One question i have though: when i had this antenna and CB on my XJ i had to run the squelch about 3/4 of the way up so i didn't get any background noise. on this set-up with the TJ i had to turn the squelch almost all the way down to be able to hear my buddy, and there is zero background noise. What is the difference, and is either one better?
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Old 04-19-2012, 09:55 AM   #2
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If the squelch is down (off) and there is no background noise, then your antenna is not working properly.

Have you tuned your antenna and checked the match?

First guess, you don't have a good ground. Bond that bracket to the tub and frame.
Second, the spring make your antenna longer, it is probably off frequency.

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Old 04-19-2012, 10:40 AM
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If the squelch is down (off) and there is no background noise, then your antenna is not working properly.

Have you tuned your antenna and checked the match?

First guess, you don't have a good ground. Bond that bracket to the tub and frame.
Second, the spring make your antenna longer, it is probably off frequency.
i have not tuned it, i don't have an SWR meter. How do you "bond" the bracket? I figured it would be a decent ground with the screw that holds it on?
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Old 04-19-2012, 01:10 PM
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also, can the CB work without the antenna, you said it my antenna probably isn't working correctly? i was talking to my buddy, but it was only 50ft or so away
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Old 04-19-2012, 01:25 PM   #5
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Check that the black lead (power wires) is well connected to a metallic point in the Jeep to ensure a good ground there. Also, the mount you made need to be connected to the body in such a way that allows metal to metal contact with nothing in between (i.e. paint). I personally also like to ground the radio chassis to the vehicle chassis just to ensure things work at their peak.

Your radio may not be well tuned but as long as the antenna is connected you should be okay for a few transmissions but Never operate your CB radio without attaching an antenna or with a broken antenna cable. This will result in damage to transmitter circuitry! The best thing to do is find a radio shop or another Jeeper with an SWR (standing wave ratio) meter and check your setup. You want your SWR as low as you can get it (1:1 is optimal).
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Old 04-19-2012, 02:33 PM   #6
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Bonding means a good low resistance ground connection. Run a decent sized wire from your antenna mounting bracket to your body/frame.

^ Find somebody local to help you tune it. Otherwise buy an SWR meter, they don't cost much, read the direction for the meter and the antenna, then tune it yourself.
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Old 04-19-2012, 10:46 PM   #7
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In pic #2, the antenna appears to be touching the spare. My guess is your SWR is very high. You may have other problems if you have no background noise with the squelch wide open. You can probably troubleshoot with an ohm meter or even a powered test light. Discon the coax from the back of the radio and check to make sure the center conductor of the coax is not grounded and does have continuity to the antenna. You'll want the shield (outside of the coax connector) to be grounded and have continuity to your mounting bracket.
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Old 04-20-2012, 07:44 AM
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^^^^touching the spare would be bad? i can just bend the bracket slightly to pull it off of it

i took your advice and added big 8ga ground, its all i had sitting around. its not pretty, but i will clean it later. still no background noise. so the goal is to HAVE that noise? i will probably just buy an antenna at radio shack for wheeling tomorrow if you guys say i am going to blow my cb.


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Old 04-20-2012, 08:46 AM   #9
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^^^^touching the spare would be bad? i can just bend the bracket slightly to pull it off of it

i took your advice and added big 8ga ground, its all i had sitting around. its not pretty, but i will clean it later. still no background noise. so the goal is to HAVE that noise? i will probably just buy an antenna at radio shack for wheeling tomorrow if you guys say i am going to blow my cb.
Agree it's not pretty, but that will do the job. Make sure you have metal to metal connections on the tub. Scrape the paint under the lug.

Oddly enough, yes on the noise. CB's are an AM modulation, without a signal present there is a lot of background noise. Just like the vehicle radio on AM, between stations it's noisy.
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Old 04-20-2012, 10:21 AM
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i scrapped the paint to bare metal. i guess i can try a cheap radioshack antenna to see if my cable is good. radio shack doesn't sell 11ft coax for cb antennas anymore, not locally anyways
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Old 04-20-2012, 04:22 PM
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well i tested the cable and it was fine, perfect continuity across the center and outer ground conductor. i also bent the bracket so it doesn't sit on the tire. going to run it tomorrow, i think it will be fine.
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Old 04-21-2012, 09:36 AM   #12
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well i tested the cable and it was fine, perfect continuity across the center and outer ground conductor. i also bent the bracket so it doesn't sit on the tire. going to run it tomorrow, i think it will be fine.
There should be no continuity between the center and the shield (outer conductor). If there is that indicates a short.
Or I miss read and you have continuity from one end to the other. Center to center and shield to shield.
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Old 04-21-2012, 09:55 AM   #13
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https://www.wranglerforum.com/f5/swr-...lp-146391.html

Read post #5, it explains a lot regarding why to tune your antenna.
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Old 04-21-2012, 05:33 PM
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There should be no continuity between the center and the shield (outer conductor). If there is that indicates a short.
Or I miss read and you have continuity from one end to the other. Center to center and shield to shield.
one end to the other, center to center, outer to outer
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Old 04-22-2012, 09:57 AM   #15
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Originally Posted by robhurlburt View Post
one end to the other, center to center, outer to outer
I miss read then.

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