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Old 09-08-2016, 11:24 PM
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Help tuning CB SWR!!!!!?!!?

Here's my setup,

Midlands 1001 CB with an 18ft cable and the teraflex tire carrier mount using a firestik stud mount and the quadratec CB antenna quick disconnect and 4 ft firestik antennae. I ran a ground wire from one of the mounting bolts on the antennae mount to the Frame of the jeep.

When I hook the SWR meter in line switch it to fwd press the transmit button and turn the calibration nob to set. Then i switch it to ref and the needle barely moves to the left, still way in the red. Am I doing anything wrong? Or what is causing my SWR to be so off.

Also when I transmit with the SWR meter in line the gauge on the CB screen only goes like 1/3 of the way up but then when I take the SWR meter out the gauge goes all the way up when I press the transmit

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Old 09-09-2016, 01:20 AM   #2
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Old 09-09-2016, 03:08 AM   #3
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Old 09-09-2016, 11:04 AM   #4
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Take a look at the "CB Radio Basics: HOW TO Adjust your SWR" sticky thread at the very top of this forum's front page. If you still have problems after reading it, it's likely your antenna mount was misassembled which will invariably cause a high SWR.

Come back to this thread for additional assistance when/if needed.
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Old 09-09-2016, 11:27 AM
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Quote:
Originally Posted by Jerry Bransford View Post
Take a look at the "CB Radio Basics: HOW TO Adjust your SWR" sticky thread at the very top of this forum's front page. If you still have problems after reading it, it's likely your antenna mount was misassembled which will invariably cause a high SWR. Come back to this thread for additional assistance when/if needed.
I read through it and seems like I did everything right, the only thing I can think of is I could try scraping the paint off the antenna mount and ground wire I ran, would it be bad if I sprayed some corrosion inhibitor where I scraped the paint off to keep it from rusting or would that affect the ground?
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Old 09-09-2016, 11:38 AM   #6
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If paint or powder coating is not removed, the antenna mount won't get its required RF ground which is absolutely required before the antenna can be tuned to a good low SWR.

The mounting bracket has to have a good large surface area bare metal ground connection to the Jeep, and the antenna mount must have a good large surface area bare metal connection with the bracket. A corrosion inhibitor sprayed on the bare metal would prevent it.

Here's one example of where the powder coating has to be removed from the bracket so the antenna mount gets its required ground connection... the bracket has to have a similar ability to get an adequate ground connection to the Jeep which can't be accomplished by just installing a common ground wire like would suffice for a light bulb.
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Old 09-09-2016, 11:50 AM
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If paint or powder coating is not removed, the antenna mount won't get its required RF ground which is absolutely required before the antenna can be tuned to a good low SWR. The mounting bracket has to have a good large surface area bare metal ground connection to the Jeep, and the antenna mount must have a good large surface area bare metal connection with the bracket. A corrosion inhibitor sprayed on the bare metal would prevent it. Here's one example of where the powder coating has to be removed from the bracket so the antenna mount gets its required ground connection... the bracket has to have a similar ability to get an adequate ground connection to the Jeep which can't be accomplished by just installing a common ground wire like would suffice for a light bulb.
Bare with me I'm new to CBs. I used just standard wire from the mount to the frame of the jeep as a "ground strap" how should I go about making sure the antenna mount is an adequate ground plane.
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Old 09-09-2016, 12:23 PM   #8
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Bare with me I'm new to CBs. I used just standard wire from the mount to the frame of the jeep as a "ground strap" how should I go about making sure the antenna mount is an adequate ground plane.
Other than the bare metal recommendations I made above? The key to providing a proper RF ground to an antenna is that it requires a minimum amount of surface area. It is best to obtain that by removing the paint or powder coating away from between the surfaces where the bracket bolts to the Jeep. The less desirable method would be via a braided ground strap (which has more surface area than a common wire does) which would replace the standard wire you used. An insufficient RF ground means the antenna won't tune up as well as it could with a good RF ground.
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Old 09-09-2016, 12:27 PM
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the bracket has to have a similar ability to get an adequate ground connection to the Jeep which can't be accomplished by just installing a common ground wire like would suffice for a light bulb.
Here where you said this. I used just a simply ground wire from the antenna mount to the frame of the jeep to create a larger "ground plane" but if I can't use a common ground wire like for a light then how would I go about making the antenna mount a larger ground plane.
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Old 09-09-2016, 12:28 PM   #10
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I added more information to my above post..
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Old 09-09-2016, 12:31 PM
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I added more information to my above post..
would using larger wire like 10 gauge help? Or is a ground strap the best bet?

Thanks a lot for the help I'm gonna get the Dremel out when I get home and get rid of all the paint on the antenna mount and try to tune it again.
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Old 09-09-2016, 12:50 PM   #12
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would using larger wire like 10 gauge help? Or is a ground strap the best bet?
I am recommending a braided ground strap for a lot of reasons, especially that it works best for RF.
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Old 09-09-2016, 06:55 PM
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I am recommending a braided ground strap for a lot of reasons, especially that it works best for RF.
Alright, thanks I ground down the paint at all the mount point where you showed and now I got my SWR to 1.4
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Old 09-09-2016, 07:00 PM   #14
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Good job 1.4 is fine, go have a celebratory beer (or three) now!

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