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Old 02-04-2011, 06:28 PM   #1
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cb issues

so i have my cb all installed and just tried to tune it...getting swr readings of 3.2 for both 1 and 40. anyone know what the issue could be? i mounted my antenna on my spare tire carrier by the way. been out here for 5 or so hours in the MD cold...

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Old 02-04-2011, 06:34 PM   #2
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Odds are high that your antenna mount is the problem. If you can take a good sharp well lighted closeup photo of the mount from the top and bottom, that will help so I can give you some specific advice.

More often than not with such a high SWR, the antenna is shorted to ground from the plastic insulating washer being missing, mounted in the wrong location, or broken which allows the antenna to touch the mount which shorts it to ground.

Is your mount like this one? If so, look where the insulated shoulder washer is and make sure yours is identical so far as where the illustration shows it to be located.

Only the bottom of the antenna mount, shown below the mounting bracket, should be grounded. Nothing above the mounting bracket should be grounded or showing a connection to ground.
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Old 02-04-2011, 06:53 PM   #3
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Old 02-04-2011, 06:55 PM   #4
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is the bottom bolt ground or hot? now that im looking at it i believe that i might have grounded it out with the bottom bolt touching the mount
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Old 02-04-2011, 07:09 PM   #5
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That bottom connection should not have any electrical connection with the mount.
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Old 02-04-2011, 07:25 PM   #6
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that was it. i hadnt made the hole in the mount large enough and the bolt was making contact and grounding it out. thanks jerry
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Old 02-04-2011, 07:31 PM   #7
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The orientation and order of the FireRing and components looks right, but the "fit" doesn't. it appears the nylon shouldered washer and FireRing aren't fitting the mount correctly. Also, are you getting a good ground through the mount itself to the tailgate?

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antenna , cb radio , tuning

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