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Old 06-10-2007, 07:08 PM
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Default CB Antenna Grounding

Okay, I admit I'm pretty thick when it comes to radio stuff but installing a CB antenna is something that should be easy. Drilled a hole in my rear bumper spare tire swing out. Attached the antenna, ran the cable and attached to the radio. Easy enough.

Thought I'd take advantage of Mr. Cardinal's offer of his SWR meter to tune it. Get pegged reading on all channels. Yeah, I read the manual to find that indicates a bad ground.

The Wilson antenna has a wire hanging off which I assume is an alternate ground. Ran it to the license plate light ground. No change. WTF?

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Last edited by Chris; 06-10-2007 at 09:36 PM.
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Old 06-10-2007, 07:41 PM
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Pics? I'm very visual.
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Old 06-10-2007, 08:00 PM
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That wire off the Wilson doesn't take the place of a regular ground. My suspicion is that your swing out isn't grounded because the hinge and latch point prevent good metal-to-metal contact with the bumper and frame. Can you test that with multi-meter? If that's the case, connect the frame and swing out with a grounding strap, and things should get better.

If the swing out is grounded, then I bet you grounded the antenna itself, rather than the antenna mount. If the little 3/8" threads are touching metal, that's bad. A multi-meter will tell you that quickly.

Mark
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Old 06-10-2007, 08:10 PM
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Quote:
Originally Posted by ScaldedDog View Post
That wire off the Wilson doesn't take the place of a regular ground.
What's that wire for?

Quote:
Originally Posted by ScaldedDog View Post
My suspicion is that your swing out isn't grounded because the hinge and latch point prevent good metal-to-metal contact with the bumper and frame. Can you test that with multi-meter? If that's the case, connect the frame and swing out with a grounding strap, and things should get better.
Mark, Okay now I understand how the hinge would cause this problem. If you can tell me how to test with a multi-meter I can do it.

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If the swing out is grounded, then I bet you grounded the antenna itself, rather than the antenna mount. If the little 3/8" threads are touching metal, that's bad. A multi-meter will tell you that quickly.
To prevent the little 3/8 thread from touching metal (they probably are) do I just need a larger hole with the antenna centered and not touching the edges?

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Old 06-10-2007, 08:11 PM
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Originally Posted by Shark Bait View Post
Pics? I'm very visual.
I'll see if I can get a couple.
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Old 06-10-2007, 09:44 PM
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This any help?
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Last edited by Chris; 07-04-2009 at 12:58 PM.
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Old 06-10-2007, 09:47 PM
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Quote:
Originally Posted by ScaldedDog View Post
My suspicion is that your swing out isn't grounded because the hinge and latch point prevent good metal-to-metal contact with the bumper and frame. Can you test that with multi-meter? If that's the case, connect the frame and swing out with a grounding strap, and things should get better.

If the swing out is grounded, then I bet you grounded the antenna itself, rather than the antenna mount. If the little 3/8" threads are touching metal, that's bad. A multi-meter will tell you that quickly.
Quote:
Originally Posted by red cruiser View Post
Does this help?
Not really. I guess I would agree with the question about the swing out. And from the picture, you may have grounded the antenna out at the mounting point.
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Old 06-10-2007, 09:54 PM
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Quote:
Originally Posted by Shark Bait View Post
Not really. I guess I would agree with the question about the swing out. And from the picture, you may have grounded the antenna out at the mounting point.
I'm guessing the mounting point now that I know. I'll see tomorrow.

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Old 06-10-2007, 10:15 PM
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Quote:
Originally Posted by red cruiser View Post
I'm guessing the mounting point now that I know. I'll see tomorrow.

It's hard to tell from the photo, but does the threaded end of the spring touch the mount on top? If so, that's at least a major part of your problem. You should have a little plastic grommet that looks kind of like two stacked washers, one slightly smaller than the other, with a 3/8" hole in the center. That grommet fits in the mount, then the spring threads fit through the hole. that keeps the antenna (the threads and everything above it) from contacting the vehicle. Does that make sense?

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Old 06-10-2007, 10:46 PM
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It's all clear to me now - doh!

The threaded end of the spring probably does touch the mount on top, I used the very small & thin nylon washer provided, nothing resembling a grommet like you describe. I'm sure I can find one, drill my mounting hole bigger to accomodate it and all should be well. Nothing like that needed on the bottom?

So what's that extra wire on the antenna for?

Thanks, I appreciate it!

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