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Swr too high new coax cobra 29 radio, truck spec oil filled ant

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Make sure the antenna is installed correctly. and away from any metal.. Make sure the insulating washer is on top of the mirror mount.. and that the ground is connected to the ground of the coax.. do not isolate the ground from the mount. Anything near it like a smoke stack,pick-up truck cab, headache racks, vertically near the antenna can change the swr's. Next you would have to adjust the antenna's whip for correct swr's, and depending on location of antenna it would have to be shortened or made longer... ie use a spring or longer whip/shaft to increase the length.. there are many factors on high swr's issues. best way is to see it to fix the problem.

Posted on Mar 19, 2011

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Posted on Jan 02, 2017

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1 Answer

Ant light comes on when talking on cb


Check your antenna connections, Make sure they are clean and tight. Check your SWR, the built in swr meter is calibrated to turn the AWI light on if the SWR is 2.0 or higher. Check the coax wire for breaks, make sure it is not being crushed in a door,trunk lid etc.

Jun 25, 2012 | Cobra 29 LTD CB Radio

1 Answer

Added new antenna and now im failing rf output and antenna radio test?18ft coax and a 48in ant.


First thing is to be sure the mount is not shorted in any way--and also to make sure that where it is mounted it is actually connected to ground--many newer vehicles have insulators so a bumper even if metal has no ground to work off of.

No ground, open or short in coax, open or short in mounting bracket all can cause no swr or high swr.

May 01, 2012 | Cobra 29lx Cb Radio W/clock 29 Lx Lcd

1 Answer

When set my swr to the ant it is fine i turn off the radio turn back it dose not want work right after that


hi I to had that problem and it was all down to a bad connection on the coax line please check for short along coax line ,try and get the shortest run of coax to the antenna as possible if this fails try using another swr metre as your own could be given a false reading . goodluck

Jan 09, 2011 | Cobra 29 LTD CB Radio

1 Answer

I just took my cobra 29 outta my big truck to put in my pickup. when it was in my truck it worked great i installed a 5 1/2 ft wilson trucker antenna on pickup it has a good ground i ran new rg58au coax....


You seem to have a short or an open circuit . Could be a PL259 connector problem, the ant. is defective and can possibly be a bad ground. Try to add an extra GND. from the ant. base to a central GND. point...This will include the power neg. lead from the radio.
PLS E. Note: If the O/P POwer shown when you key up to check SWR is higher than usual this
will indicate a definate ant. problem................GOOD LUCK and have fun learn'n ! ! !

Dec 07, 2010 | Cobra 29 LTD CB Radio

1 Answer

The ant light is turning red when u key it up to talk


Bad coax cable or antenna. Your SWR could also be to high.

Jan 24, 2010 | Cobra 29 LTD CB Radio

1 Answer

Tuning troubles


I wrote a couple of articles that have all the info you need on a forum.

Here are the links.

How to tune SWR

High SWR causes


Hope this helps.

Nov 22, 2009 | Cobra 29 LTD CB Radio

1 Answer

Cobra 29 wx st


IF YOU CAN RECIEVE THAT IS A VERY GOOD SIGN THAT YOUR SWR MATCH IS OFF....I DONT KNOW IF YOU MATCHED UP YOUR RADIO WITH YOUR ANT.IF NOT YOU CAN BUY A CHEAP SWR METER @ RADIO SHACK...CHECK THAT YOUR COAX CABLE IS OK TRY TO REPLACE THE COAX......GOOD LUCK

Feb 14, 2009 | Cobra 29 WX NW ST 40-Channels Base CB...

2 Answers

ANT indicator


Something in your antenna setup is causing high SWR reflected back into the radio. Antenna could be ungrounded? Have you tuned that antenna? Any part of the coax broken or pinched in a door? Where is he antenna located on the vehicle? Are you parked under or near a metal building? All of these things can cause high SWR reflect. Let me know if you need help in tuning your antenna or getting it set up.

Jan 10, 2009 | Cobra 29 LTD CB Radio

1 Answer

Cobra 29 LTD Classic not transmitting or receiving


ant. light should only come on if you have a high vswr a bad thing did you check that cb/pa switch is set to cb check your swr this is not a good place to mount ant. as it is close to metal of back of cab

Dec 20, 2008 | Cobra 29 LTD CB Radio

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