Question about Cobra 29 LTD CB Radio

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Red Lights I have no static no matter where I set my squelch and RF gain. Both my rx/tx and antenna lights turn red when mic is keyed. Radio acts like no antenna is attached. Antenna mount is bolted straight through my bumper, so Im guessing its not a ground problem. Radio worked fine in my tractor, but cant get it working in my pick-up. Antenna wire is connector/connector type and seems to match my mount.

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Thoroughly check your antenna connection, be certain the plastic grommet is in place (and not cracked) between the bottom of the antenna adaptor stud and your antenna mount, and check for corrosion in and around your antenna connections. If using a fiberglass antenna, check for cracked outer insulation. If a whip, be sure the Allen screws are tight and the antenna is getting a good connection. If you have a base-loaded whip antenna (Wilson 2000) make sure the base coil plastic case isn't cracked. If you find anything wrong, invest in a new antenna. If all that checks out, buy a new 18 foot piece of coax (around $20, or get the best quality you can afford) and run it to the antenna. You may have skinned the coaxial shielded outer insulation somewhere in the uninstall/install process, it only takes one tiny break to cause problems. Be sure not to run the coax through the door jamb or a window where it WILL be pinched and cause trouble, take time to run it under the dash and out a permanent vent access or through the firewall.

Posted on Oct 25, 2009

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Red light antenna light... get the swrs set on the antenna, and make sure its not internally damaged. as the other guy said, check the mic wiring... but, the tx/rx should switch colors when you key up. ABSOLUTELY, GET THE ANTENNA CHECKED... (and cable) bad swrs are your radios worst enemy, next to refreshing beverages and impacts from tossing it out the window. Only takes a few minutes, in some case seconds to start burning down the finals, as well as some other important junk in there... also, if the antenna isnt working, and or set, (could be a bad cable with torn wires inside you cant see...) the red antenna light comes on...and likely, you wont get any sound cause you get no signal... try that

Posted on Feb 15, 2007

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I had the same exact problem. the culprit was a broken ground solder on the case of the inside of the radio

Posted on Mar 18, 2007

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Check speaker...may have been damaged in removal/installation.

Posted on Mar 07, 2007

You're on the right track, it sounds like an antenna problem to me.

Posted on Mar 05, 2007

Comprobar que la antena no este en cortocircuito o falsee la conexion, si cambiaste el microfono checar la polaridad exacta.

Posted on Jan 08, 2007

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Check your microphone connection. There may be a short in your mic plug. Some radios require a microphone to be connected in order to receive. If you recently changed microphones, be certain it is wired for your particular radio. Hope this helps. Also, do not use radio if this condition still exists as damage will occur.

Posted on Nov 24, 2006

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Check your SWR on the antenna.

Posted on Mar 29, 2007

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1 Answer

Cobra tx no rx on am

only has AM but could be a number of things.First,turn radio on,make sure its on CB not PA,turn squelch all the way to the left and RF gain all the way to the right. You should at least hear something by now. If not look on the front of radio and see if any lights are lit.If the tx light and the awi light are lit its because you have a bad match on your radio.Make sure your antenna is grounded so your signal can be picked up. take a piece of wire and touch the antenna bracket and a ground at the same time.You should hear something. this is as far as you can go without more knowledge of the radio.

May 08, 2014 | Radio Communications

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Wx works but no cb tx or rx

Antenna good? Receive meter move at all? radio show transmit when key mic? more you tell me the better I can help---I will assume you know enough to make sure RF gain and squelch are set correctly.

and cb/pa in right position........

Apr 27, 2012 | Radio Communications

1 Answer


OK bare with me now i have no idea of your knowledge level with CB/ SSB radios.
Lets make sure our setting on radio face is correct before we decide this is an mechanical problem.
Set the following
  • Volume knob 12 o'clock
  • Dynamike knob 12 o'clock
  • Squelch full counter clockwise
  • Rf gain full clockwise
  • Select S/RF position on the SWR/CAL switch
  • Select AM position on the USB/AM/LSB switch
  • Select CB on the CB/PA switch
Now there will be some critics with opinions on the next instructions. Place a small screwdriver or test lead from a multimeter in center conductor of antenna jack listen for onair noise or radios operators to verify RX is working. Now remove the antenna/screwdrive/testlead. Then key mic just long enough to notice if the meter is swinging do not hold the mic button long this can damage the final. I tell you to do it this way rather that connected to your antenna system so we can eliminate the question if it is you antenna sytem or the radio.
If the LSB or USB was selected when you keyed the mic you would see no meter movement this is due to the lack of a deadkey or carrier for SSB which is a much more efficient method of transmitting on AM.
There are few things that affected the rx and tx together.

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1 Answer

Red RX/TX and red ANT light on my CB

Well,first hand ,some cobra radio,s have red some have green RX/TX lights, but are you modulating? Some green lights turn red. What is your standing Wave on the antenna,s? You need to check it and the output of the radio. To do this you need a watt or field strenth meter. Can get one at Radio Shack. Your standing Wave is ok as long as it is below a 2. That has to be done on the antenna. ..hope this helps...

Mar 11, 2010 | Cobra 29 LTD CB Radio

2 Answers

When i key up the mike the tx/rx light and the ant

your swr setting are off wack fix your swr

Oct 02, 2009 | Cobra 29 LTD CB Radio

1 Answer

The ant light and the other light light up red when i key the kic

the tx/rx liight is green when your radio is recieving signals and turns red when you are sending signals. the ANT light is red when your SWR is too high (over 3)

1. turn the knob labeled swr cal all the way counter clockwise
2. set the rf swr cal switch to the CAL position
3 key up the mic and hold it while you rotate the swr cal knob until the needle reaches the swr cal postition
4. set the swr cal rf switch to the swr position
5. key up the mic while on chanel one (record the the number)
6. switch to chanel 40 key up the mic (record the number)
if the number on chanel one is lower than the number on chanel 40 then your antenna is too long.

Sep 14, 2009 | Cobra 29 LTD CB Radio

2 Answers

I have a Cobra 29 LTD with Bluetooth. I have no static no matter where I set my squelch and RF gain unless my noise blocker is off. Both my rx/tx and antenna lights turn red when mic is keyed. I have try...

if the antenna warning indicator is lighting during transmission then the antenna is either located and.or installed improperly or a defect exists in the antenna mount or the feedline itself, including connectors.

Jun 08, 2009 | Cobra 29 LTD CB Radio

1 Answer

No rx

so the swr is fine antenna has not been hit by lightning i assume as the swr would be all wacke out check to see if the rf gain is turned all the way down maybe if you have little ones they play with everything as i know all so well. or mabe the squelch was turned allt the way up if either turn squelch down all the way and turn the rf gain all the way up if not the audio chip on the rt side of the board could be shoted out if the radio has pa put switch to pa with external speaker attached key mic and talk if you here yourself talking the chip is good. by the way has the radio been tweaked any time recently it may be also alignment problem??

Mar 09, 2009 | Galaxy Radios DX-2547 40-Channels Base CB...

1 Answer

No squelch

Yep that should happen.
Green or no color in receive mode
Red when you key the mic to let you know when you are transmiting

Feb 28, 2009 | Cobra 29 LTD CB Radio

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