Question about Cobra 29 LTD CB Radio

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I can't get the swr value close to 1 it's over 3 what am i mising

I've got the Cobra 29 LTD using a Firestik Ring coax and antenna and mounted to a tank mount on a tire carrier. The tank mount is grounded to the body of the jeep. Also, power is direct to the battery both pos and neg. On my swr meter I'm able to tune it lower than 1 but the cb won't go that low and people on the trail can't hear me...what should I look at next?

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Several things are working against you.
1 Antenna location= Needs to be in CENTER of car or truck, and high. no grounded metal can be next to the element (the hot/positve part of the antenna)

2 the only way to really ground the antenna is by having a flat metal ground plane under the antenna. DC grounding does NOT do this, that is a misunderstanding.

3 make sure you use a tunable antenna. I have found the wilson's to be very easy to tune and performe very well, for a base loaded antenna.

4 in short a wilson or k40 magnet mount placed on the very top of the roof in the center will have a perfect ground plane. Then shorten or lengthen the steel whip to ajust your SWR's. You will get the best results this way. This is the ONLY way to achevie good performace.

5 I will say this the absoulte best antenna is the 102"steel whip, if you got the clearnce and dont mind it hitting tree limbs put it on a big magnet mount with a spring at the base and youll have a perfect antenna. But the wilson is shorter and easier to tune.

Posted on May 16, 2010

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1 Answer

29 cobra ltd brand new everything swr cant set my swr pegs out all the way to the right when i key up cant even get the right hight for my 4' firestick also the antenna light is very dim


If your coax isn't shorted somewhere (which can easily happen) then I would say the problem lies in your amplifier. Your amplifier needs to be matched to your radio by adjusting the input and output capacitors. Not many so called "techs" can do this and Bubba sure as hell don't know. It take proper equipment and the right parts to do the job right.

Aug 22, 2012 | Cobra 29 LTD CB Radio

1 Answer

AntennA IiNinSinsTinstRinstrUinstruCinstrucTinstructiOinstructioNinstructionSinstructionS


are you asking for antenna mounting instructions? if so here is your answer. Mobile antenna mount as high as possible on vehicle, make sure coax wire is run where it will not get crushed or come into contact with any moving part. make sure antenna is properly grounded and tune for lowest possible SWR. 1.5:1 is good.

Dec 11, 2011 | Cobra 29 LTD CB Radio

2 Answers

How to match a antenna to a cobra 29 LTD Classic


You are actually tuning the antenna to the vehicle it is mounted on here are some very good resources. http://www.rightchannelradios.com/pages/cb-antenna-tuning-guide-pv-c0-61.htmlhttp://www.wilsonantenna.com/swr.php

Be aware that if your radio has been modified it may produce a dirt signal that an swr meter may read as reflected power. In this case it may be more accurate set with a unmodified radio also if your radio is setup for a linear it may have a deadkey to low for the swr meter to calibrate correctly.
Hope this was of help.

Nov 26, 2011 | Cobra 29 LTD CB Radio

1 Answer

When i press the mike two red lights are coming on end the reception isn't good how do i fix this problem


Green changing to Red it normal operation from receive to transmit.

However the ant light should not light it is to indicate the SWR= standing wave ratio.This does not normally indicate any reduction in you ability to receive signal it only refers to reflected power from you antenna system to your receiver/cb. You may have a insulator in the wrong location. If it is an solid mirror or body mount the mount must be grounded with no insulator on coax side and an insulator on the antenna top of mount antenna must not be grounded.
If you have a coax that is damaged and i mean even bend from pasting thru a door or other "pinch point" it may be bad.
http://www.firestik.com/Meas-SWR.htm

Sep 16, 2011 | Cobra 29 LTD CB Radio

1 Answer

I have a cobra ltd 29 bt hooking to a 102 inch whip and cannot get m swr readings down under 3 or it will go up higher then the calibrate triangle instead of down. my antenna is mounted with a gumdrop...


  • Sounds to me like you need to check the connectors and connections on that coax. A cobra29 and a 102" whip is a simple enough set up and should not produce that high of SWR unless the coax or the connectors on the coax are pretty messed up. Also i recommend putting an SWR meter in line.
  • The meters on them Cobras can be accurate sometimes but I trust an inline meter much more.
  • Ground it again to make sure.
Regards, Tony

May 17, 2011 | Cobra 29 LTD CB Radio

1 Answer

Just bought a workman 3000 to 7500 watt cb antenna, ever heard of it?? Im going to hook it up at work monday, got a cobra 29 ltd + or - 30 watt output. 9' coax. the antenna has 8" of swr adjustment... for...


cobra 29 has a 12 watt final, doubt you will be doing 30 watts. 25 if your lucky. Use 18 feet of coax, you will get better broad band.

If the antenna comes with the whip in it already, its been tuned at the factory and you shouldn't change it yet.

If not, half way is okay. It still needs to be tuned on a meter. either the one in the radio or an inline.

Mar 06, 2010 | Cobra 29 LTD CB Radio

1 Answer

I set the swr on my antenna and it keeps moving i have a cobra 19 dx iv and i just installed a net window mount antenna 27" on my back window that has factory tint.


1) if you are talking, your SWR will most likely move. You must take the reading while not modulating, (talking into the mic)

2) Window mount antenna's are GARBAGE. they are worthless. BAD BAD BAD. You wasted your money. Get a mag mount.

3) if you are not in an open lot, your SWR's will be different due to structures reflecting signal back. Always take your SWR reading in an open lot.

4) You could be experiencing Common mode currents. Normally the signal travels on the inside of the coax ground. Common mode current is when the signal is traveling back down the coax on the outside of the ground in the coax. (The biggest cause of this would be the window mount antenna). If you want to keep that garbage antenna, then you can make an RF choke in the coax. The best solution is get a better antenna. Here is how to make the choke. As close to the antenna as you can, take 6 ft of coax and loop it uniformly laying each coil next to the other. use electrical tape to hold it in place. You want 6-8 wraps. You want a nice uniform coil.


Just get a better antenna. Window mounts are the worst. You get horrible receive and horrible transmit. Get a wilson 500 mag mount. It will work so much better for you.

Apr 21, 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

1 Answer

Cobra 29 LTD Classic not transmitting or receiving


As I understand from a tech friend of mine, most truck beds are not grounded well enough. Perhaps you could borrow/purchase a magnet mount antenna and locate it on the roof, for testing. Then you would have it narrowed down to the location.

Dec 05, 2008 | Cobra 29 LTD CB Radio

3 Answers

Cobra 29 ltd classic antenna calibration ??


You should not calibrate the antenna before you install it on the car!! the antenna needs to be calibrated on the vehicle that it is going to be on. Type of vehicle, different mounts, and many other variables can change the amount of reflection you will get.

j0hn9999 did a much better job but left some info out.

Take your SWR readings on channel 1, then on channel 40.... NOW, if your SWR is higher on ch 40 then ch 1, then your antenna is too long and it needs to be shortened. Refer to the antenna instructions on how to shorten the antenna.

If your SWR is higher on ch 1 then on ch 40 then your antenna is too short. You must lengthen the antenna. Again refer to your antenna instructions on how to lengthen your antenna.

You must calibrate each time you take a reading.

Make sure your doors and windows are shut when taking a reading

Make sure you are in an open lot when taking a reading as buildings, trees and other structures can cause reflection and give you an inaccurate reading.

If you adjust the length of your antenna on another vehicle and then put it on yours, the SWR will be off. It will need to be tuned again.

An external meter is better then the one in the radio, but will need to be hooked up in the vehicle you have the antenna on.

If you are not running any kind of power, or do not have a swing kit installed, and the radio is stock, the meter in the radio is more then enough to get a correct SWR reading.

Sep 27, 2008 | Cobra 29 LTD CB Radio

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