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high swr #60836
04/22/03 01:39 AM
04/22/03 01:39 AM
Anonymous OP

hey guys

i got my rear bumper two days ago with my cb antenna mount on it. for some reason, when i put my cb antenna on the mount, the swr reading is unbelievably high. i tried to tune it, but nothing works..any suggestions?

From the Off-Road World
Re: high swr #60837
04/22/03 02:45 AM
04/22/03 02:45 AM
Randy Braley  Offline
Getting the Wheeling Fever
Joined: Mar 2002
Posts: 63
Kansas City
A friend of mine with a J#@p had the same problem and fixed it by running a special ground wire from the mounting point to a good ground.

Randy Braley, Shawnee, Kansas
2000 4Runner: TJM T-15, Warn M8000, Elec Rear Locker, Sonoran Steel Shackle Hangers, OME, Maniac Sliders, Cobra 75 WX ST w/ FireStik II, BFG AT KO's 265/75 R16
TLCA #12443
Re: high swr #60838
04/22/03 02:47 AM
04/22/03 02:47 AM
aowRS  Offline
Body Damage is Cool
Joined: Aug 2001
Posts: 1,026
Ellicott City, MD
Is the antenna mounting position low on the bumper, or mounted atop a spare tire carrier? I've read that while a low mount is good for keeping your antenna out of the branches, it'll wreak havoc with the signal, as the antenna sits adjacent to the steel structure of the truck - not above it.


2001 4Runner SR5 4WD, Dorado Gold, 303,000+ miles
2014 Audi A4, Monsoon Gray
1995 Porsche 993, Polar Silver
Re: high swr #60839
04/22/03 02:46 PM
04/22/03 02:46 PM
fourwd1  Offline
Body Damage is Cool
Joined: Feb 2001
Posts: 1,681
Baltimore, MD USA
Andreas is correct, a bumper mount and a shortened antenna is not a good combination. You didn't say what vehicle or type of antenna your using, so it's hard to give specific help for your problem. But any antenna needs to be mounted on a surface area of sheetmetal to work properly (refered to as a groundplane, not to be confused with an electrical ground). Bumpers, brushguards, spare tire mounts, etc are not good mounting points if maximum range is desired.

Typically, if your VSWR is high (> 3:1) and adjusting the antena has no effect, a wiring or mounting problem is indicated. The coaxial cable could have an open or a short at the connector end or the antenna end, or the antenna mount could be installed incorrectly with the same result.

Try the SEARCH function for more info, this subject has been discussed to death, and much info is available in the archives.

- seen in FOUR WHEELER mag July 2006 & OFF-ROAD mag Feb 2007 -
'84 4Runner ARBed 5.29s F&R,4.7 & 2.28 t-cases,hy-steer,BudBuilt skid,30spl Longs,36" TSLs,Chevys

'83 P/U, Buick 231 V6,Holley 4 bbl,Weiand intake,Downey headers,TH350 w/700R4 gearset
Re: high swr #60840
04/22/03 03:14 PM
04/22/03 03:14 PM
Dandeman  Offline
Toyota Moderator
Joined: Apr 2000
Posts: 3,748
Chapel Hill, NC
Here's the link to more detailed discussion about acheiving a good RF ground http://www.4x4wire.com/cgi-bin/ultimatebb.cgi?ubb=get_topic;f=13;t=010309#000021

Understanding what it takes to achieve a good RF ground for the antenna is key...

As discussed, the "counterpoise" or ground plane provided by proper grounding to the rest of your vehicle must be effective to get the SWR down..

What works for DC grounds will not always work as an RF ground. The above link explains...

Re: high swr #60841
04/22/03 04:16 PM
04/22/03 04:16 PM
jataga  Offline
Rock Warrior
Joined: Jun 2002
Posts: 557
Atlanta, GA
You have a short.

Make sure you follow the directions to install the antenna to the T. It is probably not your cable that is shorted but the mount that is not secured properly or you might not have the correct washer in there. Same thing happened to me. After checking it all out, it was the mount.

99 Limited 4Runner 4WD
ARB front Bumper Kennesaw rear bumper
WARN 9500 Winch
Hella 4000s
Re: high swr #60842
04/23/03 05:15 AM
04/23/03 05:15 AM
Anonymous OP

I hope this can explain it.
Just made this page.

This is how mine is done, and shows you what must be isolated as to not get a ground to short condition.

Moderated by  Adam F, Dandeman, kewlynx 

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