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Old 01-17-2012, 07:22 AM   #1
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CB Radio Basics - Grounding & Bonding

This is good information to know when someone starts talking about "grounding" your vehicle. I could not explain it any better than these guys in the two links below. I will come back & put it in my own words when I have time though.

Grounds & Bonding by YB0EMJ

"Bonding" by K0BG

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Old 01-19-2012, 10:53 PM   #2
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All that was gibberish. I have a cb radio antenna I'm trying to tune and my swr is 10 I've spent hours messing with the adjustable tip, and removing parts of my connection like the spring and I think I may have a bad ground but I'm not really sure what a ground for a cb antenna mount looks like. I have a black wire off my Wilson silverload antenna but they say not to attach it unless everything else is hooked up right and I'm not sure if it is or not. I only got I isolated ring with my mount. Can u help.

Attachment 91178



Attachment 91179

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Old 01-19-2012, 11:05 PM   #3
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Take the spring out of the stack and thread the antenna directly in the stud mount and check your SWR. Springs can help or hurt your SWR, depending on your antenna length.
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Old 01-19-2012, 11:13 PM   #4
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I'd dump the spring in your setup and add a ground wire from the mount to the chasis.
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Old 01-20-2012, 07:14 AM   #5
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I have remove the spring and still same readings, and with the ground wire, just a ground wire from mount to a good ground?
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Old 01-20-2012, 08:32 AM   #6
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Quote:
Originally Posted by kylekae View Post
I have remove the spring and still same readings, and with the ground wire, just a ground wire from mount to a good ground?
Yes...those tailgate mounts are notorious for having grounding problems. The tailgate isn't always grounded to the body very well. I think some people run a ground strap from the tailgate directly to the body (you could prolly do it on the inside where it'll be a clean install--make sure you grind away the paint to ensure a good, metal on metal connection) and that solves their problems.
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Old 01-20-2012, 11:57 AM   #7
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Quote:
Originally Posted by kylekae
All that was gibberish. I have a cb radio antenna I'm trying to tune and my swr is 10 I've spent hours messing with the adjustable tip, and removing parts of my connection like the spring and I think I may have a bad ground but I'm not really sure what a ground for a cb antenna mount looks like. I have a black wire off my Wilson silverload antenna but they say not to attach it unless everything else is hooked up right and I'm not sure if it is or not. I only got I isolated ring with my mount. Can u help.
lol, no problem, on mobile now & at work, but will help ya out when I get in from work this evening. I will agree with some of the responses that have been added already ..... Get a ground strap from the "help" section at just about any auto parts store & connect it from the main body to your tailgate & see what happens
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Old 01-21-2012, 01:03 PM   #8
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I now have a ground wire and the SWR is 3.5 a little better but now what?
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Old 01-21-2012, 03:38 PM   #9
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Did you make sure the paint was removed to bare metal when you installed the antenna mounting stud? After that, you are down to adjusting the antenna. In that case, refer to the "Adjusting SWR thread.
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Old 01-21-2012, 05:45 PM   #10
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Thanks
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Old 01-21-2012, 05:47 PM   #11
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Thanks but the lowest I can get the swr is 2.5 and that's removing the adjustment whip.
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Old 01-21-2012, 06:48 PM   #12
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Quote:
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Thanks but the lowest I can get the swr is 2.5 and that's removing the adjustment whip.
What brand of meter are you using? What is your SWR at channel 1, 20, & 40? Three separate readings.
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Old 01-21-2012, 08:17 PM   #13
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The meter is an opek swr-2t 1 is 2.5
20 is 3 and 4 is 3.5
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Old 01-21-2012, 09:34 PM   #14
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OK, your antenna is still too long. Have you removed the spring yet? Also, if you want to keep the spring, & your vehicle is bonded well. You may need to switch to a different type of antenna.
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Old 01-22-2012, 08:29 AM   #15
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I'm have removed the spring and will a 2 ft adjustable. Why is the Swr so high if its all hooked up right. I have watched videos and they have a low swr before tuning?
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Old 01-22-2012, 09:49 AM   #16
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I'm have removed the spring and will a 2 ft adjustable. Why is the Swr so high if its all hooked up right. I have watched videos and they have a low swr before tuning?
There are many things we can't answer from our remote locations. I would check a few more things before going big and moving the antenna mount or replacing the antenna. Have you checked the jumper you are using between the radio and the SWR meter when you hook-up to test? That could be affecting every test you've done and you may be trying to tune your system to work with a bad component. Have you carefully read how to calibrate the SWR meter to get an accurate reading? There are a half dozen more things to consider, and you will find it through the process of elimination.
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Old 01-22-2012, 11:24 AM   #17
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There are many things we can't answer from our remote locations. I would check a few more things before going big and moving the antenna mount or replacing the antenna. Have you checked the jumper you are using between the radio and the SWR meter when you hook-up to test? That could be affecting every test you've done and you may be trying to tune your system to work with a bad component. Have you carefully read how to calibrate the SWR meter to get an accurate reading? There are a half dozen more things to consider, and you will find it through the process of elimination.
Remus nailed it. Same thing I would have suggested. Check your coax again, may need a different antenna or may need to move the mount. If you have access to another SWR meter, check it with that. When I tune a system, I always check it with two separate SWR meters to make sure one is not defective & giving false readings.
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Old 01-22-2012, 02:49 PM   #18
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Thanks you have been a huge help
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Old 01-22-2012, 03:31 PM   #19
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You are very welcome, anytime. Good luck with your rig.

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