Question about Cobra 29 LTD CB Radio

3 Answers

No antenna lite when transmitting

It seems when iam in the ohio area i don't get an antenna lite when trans mitting. i had one when i was in the tennesee area or down in that area, but when i was in the pa. area or when i got back to the ohio area, i lost the antenna lite when i transmitted. this could be just a fluke, but i want to find out how to calibrate the swr on the radio. is it something in the radio that i have to adjust, like how i calibrate it on the cal button, or is it something with the antennas. the antennas were on the truck. it is a freightliner antenna setup. i think one antenna is a fire stick and the other is a k40 with 2500 watts capibility. ican adjust the top of the k40. i am not sure about the fire stick. can you help me understand and learn to fix this problem myself? thanks for your help. steve

Posted by stephen_mann on


3 Answers

Goober Pyle

  • Level 2:

    An expert who has achieved level 2 by getting 100 points


    An expert that got 5 achievements.

    Vice President:

    An expert whose answer got voted for 100 times.


    An expert whose answer got voted for 20 times.

  • Expert
  • 14 Answers

Antenna light should be a warning indicator for high VSWR..... simple rule of thumb for CB antenna.... the lower the frequency "channel" the longer the antenna length, higher the frequency "channel" the shorter the antenna length. Your vehicle is a ground plane, where you mount the antenna will also affect its operation and tuning. A properly tuned antenna will have lower reflection on the midband channels and gradually rise as you near the upper and lower end of the band. Some base loaded antennas will be noticably narrow in bandwidth, if you have that problem then tune it for the channel you use most!
K40 has always been good for easy tuning and band coverage, center it on the vehicle top for good omni coverage!
PS... always make sure your connectors are secure, a loose shield will ruin your day when adjusting SWR!

Posted on Dec 22, 2008


Donnie Wilson

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points


    An expert that got 10 achievements.


    An expert that got 5 achievements.


    An expert whose answer got voted for 500 times.

  • Master
  • 986 Answers

Freightliner uses mutiplex

Posted on Oct 18, 2009



  • Level 1:

    An expert who has achieved level 1.

  • Contributor
  • 3 Answers

Both antanas should be the same (matched) read mfg instruction on how to set swr make sure ant. cable is not kinked mashed nicked or coiled up

Posted on Dec 24, 2008

Add Your Answer


Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

1 Answer

The gear selector on my 2004 town car 4.6L is very loose. It has a lot of play and its not the 2 torx screws that you tube videos show. A lot of times its real hard to shift out of park.

The shift tube can crack(gets looser and looser) or the pin break on some cars. Not a fun job to work in that area. Watch out for airbag also. Unhook battery cables and let sit several minutes before working on steering column.
May be best to take to good mechanic.
Also, you might just have a bad bushing at the trans lever area.
don-ohio (:^)

Nov 12, 2016 | 2004 Lincoln Town Car

1 Answer

What should i look for if my uniden presiden jackson cb has no transmit or no recv

voltage regulator. is it a ss (superstar) jackson or president jackson?

Dec 21, 2015 | Uniden Radio Communications

1 Answer

Hallo iam using a icom 718 on 28mhz up to 14mhz have a problem of a high swr reading but the antenna is fine then power drop away

Check the feedline to the antenna, and the antenna itself. High SWR means that power is being reflected back from the antenna. A good discussion of SWR may be found here:

If you antenna is designed for 10M and your are trying to transmit 20M on it, there will be a significant mis-match. You may want to look at installing a better broadband antenna, such as an OCFD that will operate better on multiple bands.

Feb 18, 2015 | Icom IC-718 Base radio, HF, 100W

1 Answer

2003 mits eclipse automatic does not shift into gear. shifter works but no engagement, no reverse, drive

Check that the shifter cable is fully moving/engaging the linkage on trans other than that check fluid and check electronic plug connection

Jan 05, 2013 | 2003 Mitsubishi Eclipse Spyder GT

1 Answer

Very bad am radio reception, how do i fix?

If it's interference from the high tension wires,you probably need new spark plug wires with good resistor type plugs.
Now,also a bad antenna or a poor match of frequency to the antenna from the rec eiver can cause weak reception.Anyone who knows electronics can match the antenna to the receiver. don-ohio

Sep 14, 2011 | 2005 Dodge Magnum

1 Answer

When i que my mic the display light shows no antenna light unless im touching the antenna i tried this on 2 different trucks

The mounting and adjusting of the antenna is crucial,if it is a magnet mount,the surface must be clean,dry and best to not have any rust,also bottom of the magnet needs to be clean and mount it to the largest area of metal on the vehicle...the trunk lid,middle of your roof are the best.Permanent mounts need to be touching bare metal at the mounting hole not paint,again either mount requires SWR adjustments to match the radio it's attached to,it may require trimming of the metal"whip" if it needs to be lowered for the best reading,also don't rule out the radio chassis might need to be grounded as well.For general safety I would not recommend touching an antenna while it is transmitting any radio signal...if all above is good,you transmit and receive fine,more likely light is faulty or needs it's sensitivity adjusted...Good luck,hope this info helps.

Sep 03, 2011 | Cobra 29 LTD CB Radio

1 Answer

People I cam calling complain of very low voice level from my handheld. I am definitely directing my voice into the microphone .

Check to see if you trying to transmit on INTor Can insted of USA then check to see if yor're trying to trans mit on 1 watt for long distances insted of 5 watt. Good luck.

Feb 07, 2011 | Standard Horizon HX850S VHF Handheld...

2 Answers

I can receive, but not broadcast from my CB radio.

Hi mfdogman,

This problem is usually one of two things. Check the antenna coaxial cable and connections first, to be assured there are no shorts. That's one of the symptoms of receive and no transmit. The other would more than likely be a defective RF Transmitter stage in the final amplifier circuit. That could be a defective (blown or shorted) Power Transistor or IC (Integrated Circuit) Module.

After checking the antenna and coax, key the Radio up and look for any meter or indicator sign of TX (Transmitted power). If you have a power meter, use that for power and SWR (Standing Wave Ratio which should be close to 1:1 ratio) checks of the radio and antenna system. If there is no power, then you will need Technical help from a Professional at a repair facility, unless you are familar with this work. The antenna problem, if it should be able to fix.

Let me know when you get this fixed, and contact me again for more help. Thanks.

Regards, Bill

Sep 18, 2010 | Midland 77-285AXL 5-Channels Base CB Radio

1 Answer

MIdland no sound s/rf dancing

may be u burned yr final transistors...check if yr antenna is well grounded and try just after this to transmit, if the indicator is not stable on the green area when you are in "am" modulation stop to try and bring to the assistance
rgds Stefano

Dec 17, 2008 | Midland 1001Z 40-Channels Base CB Radio

Not finding what you are looking for?
Cobra 29 LTD CB Radio Logo

458 people viewed this question

Ask a Question

Usually answered in minutes!

Top Cobra Radio Communications Experts

Brad Brown

Level 3 Expert

18596 Answers

Michael Thomas
Michael Thomas

Level 3 Expert

3056 Answers


Level 3 Expert

85239 Answers

Are you a Cobra Radio Communication Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides