Question about Cobra 29 LTD CB Radio

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I can hear people talking, but they can't hear me, or they say I sound like an alien

I have replaced the Mic, 3 of them, I have replaced the antennas, also 3 of them, 2 different radios, different connections, and 1 other vehicle. What on earth is going on here? I can hear the people talking.... Sadly, I just have to listen, .............................or talk to myself! Please Help!?!
Susie

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Check to see if the meter needle is swinging backwards when you key up. If it does your final may be bad. If the needle goes forward and others say they see your keying up but no sound your audio chip may be bad; especially if you have tried so many mics and antennas. If your radio has a swr warning light and it comes on this could extremely limit your range and others may not hear you and contiued use will damage your radio. Good luck!!!

Posted on Aug 08, 2008

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I have 2 cobras 29 radio always worked good till recently. Have a rk56 mic I can hear but can't talk. Mic keys up but they hear nothing bought a new 29 chrome digital read out and a new mic just a wood...


fiberglass,no ground plane. Did you use the meters on the radios to match your antennas or a seperate external antenna.you might have to run your own coax and hook up a mirror mount bracket and put your favorite antennas on them then match them and ground them to the chassis use common sense to show you what to do next and you should be getting out great. Sometimes people change the antennas on those trucks with built in antennas and don't realize that the coax has just fallen out of site into the body somewhere. thats why I said install your own.

Aug 26, 2014 | Radio Communications

1 Answer

Transmitting and Receiving Signals


Modulation being muffled could be the mic or it could be an adjustment in the unit.

May 21, 2013 | Cobra 19 DX IV CB Radio

1 Answer

NOT RECEVING OR TRANSMITING


Can you see the s-mete if it has one moving up and down on any channel? Do you hear any audio at all? could be a couple of things. Bad mic switch or mic cable, bad antenna or coax, bad audio amp. To check the audio amp plug in a speaker to the PA jack, put the PA switch on PA then press the mic to talk. If it works the audio is fine the mic is good and the mic cable is good. Noiw plug the speaker into the speaker jack, do you hear anything? If not then your antenna or coax has a problem, fix or replace antenna or coax.

Jan 04, 2013 | Radio Communications

1 Answer

It has a great dead key but when I key up you can barely hear me talk. even with he mic gain turned all the way up


  • Hi, I can help.

  • If you have confirmed your dead key being "great" the the two things that can be causing your problem is a faulty mic, mic wiring, mic connector (either on the CB i=or the mic connector itself.
  • Have you tried a different mic?

  • The other thing would be a bad antenna, antenna connection, SWR.
  • Have you tried a different antenna? Checked your SWR (with an inline meter)? Make sure the antenna connector (PL259) and the connector for the antenna on your CB (SO239) are in good condition and that there are no cold soldier joints.

  • If you have any comments please feel free to leave them here.
  • Hope this helps and thanks for using FixYa.

Regards, Tony

Sep 14, 2011 | Cobra 29 LTD CB Radio

1 Answer

I have a magnum s 3 was working fine comes on lights up recives great talk back and neddle swings but will not transmitt hears fine will not say a word whats wrong


There may be 3 solutions. First, is the "dynamic" or mic volume set too low? Also, there may be a problem with the SWR (Short Wave Radio) settings which is most likely an antenna problem. Also, but less likely is the mic plug is loose or corroded. Try buying a new set of antennas and checking the antenna connections all the way through the vehicle and changing the mic volume settings.

Dec 19, 2010 | Magnum Radio Communications

1 Answer

I have no sound, even when I key mic. The meter goes up one time and not the next.


This could one or more of the following problems. I'll start with the ones I feel are most likely the cause, but you can check them in which ever order you like.

When the mic is keyed, you should not hear anything from the reciever. The mic's PTT (push to talk) button switches the transciever from recieve mode to transmit mode, if it didn't all you would hear and transmit would be screaching feedback. Also, during the transmit mode, the radio's meter should switch from indicating relative signal strength (or "S" units) to power out where 4 watts AM should indicate full scale deflection of the meter.

This makes me believe that you've got a intermittent connection in the mic circuit. This can be anywhere from inside the mic, mic cord, mic connector and inside the radio - from the mic jack. The cord is supect as it is always being twisted, pulled, stretched and strained under extremes of temperatures and humidity.

You can check the cord by simply replacing it or with a dummy load connected to the antenna, see if keying the mic and shaking the cable makes the power meter jump or bounce. Twist and pull the cord over its entire length - but pay particular attention to the strain relief points near the mic body and connector as these are typical points of failure.

Check contacts inside the mic, between the mic cord and plug, mic plug and mic jack on the radio to be sure there is no oxidation or broken / shorted wires.

There may also be a problem with a blow speaker, which would explain the lack of audio on the reciever. Connect an external speaker to the external speaker jack (if provided) or open the radio to connect a speaker to the one under test.

Least likely - but still possible is a fault with the antenna coax cable, antenna and / or mount. Look for split, crushed, or otherwise damaged cable along the entire length. Pay attention to pinch points, etc. Repair or replace as needed. Look for oxidation build up between the antenna and mounting threads - clean as best you can or replace. Check the coil (if any) on the antenna. Broken, burnt, etc.insulators over coils are indicators of a problems. Again, repair or replace as needed.

I hope this helps you identify the source of the problem - good luck!

Oct 30, 2009 | Midland 1001Z 40-Channels Base CB Radio

1 Answer

When I Press the mic to talk, others hear me key down, but no sound is transmitted


Hello lummox30,

Check you mic first to see if it is indeed working. Then if it is the below advice is applicable.
It sounds as if your TX audio amplifiers might be malfunctioning or the TCXO might be bad. If you have a background in Electronics I would suggest that you open up the unit and using a dummy load on the antenna check the two TX audio amps to see if when you key the mic and speak into it the amplifiers are amplifying your voice and sending it to the modulator. If the problem is not amps or the filters in between the amps, the modulator and the VCO buffer are suspect. If the TCXO is being modulated I would check the PPL IC and the Drive amp to see if the modulated signal is getting through. The last two checks I would perform are on the final amp and the TX switch prior to the antenna jack.

If you do not have a background in electronics, still check your mic, but the rest of the above advice can be done by a qualified Radio Technician.

I hope this helps,

Thank you,

Shuttle83

Oct 01, 2008 | Maxon MCB-30 40-Channels Base CB Radio

1 Answer

No response to radio check


Try this: find another CB radio and tune it into the same channel as the other one and talk on the one you have trouble with and if you hear yourself on the other CB, your radio is fine. But if no one can hear you, you might need to find a better antenna, I'd recommend Shakespear or Moonraker antennas. They're pricey, but worth the money.
However, if you still can't hear your voice on another radio, you may have either a Mic problem or a Transmitter problem. If so, use a different Mic and see if that solves the problem. If not, you may need to get another transmitter or new radio.

Best Regards,
Gavin93

Aug 05, 2008 | Radio Communications

1 Answer

The marine cb radio turns on but you can't here noboby talking nor can u talk out from the cb


Sound like either an antenna problem, or a mic problem.

The mic on most cb's also serve as transmit/receive switching. A broken wire or bad switch in the mic or cord can cause either or both to fail.

If you have a bad antenna (or cable), you should still hear squelch noise on receive (maybe lower in volume) and be able key the mic and get a transmit light on the unit. Visually inspect the connector, cable and antenna. If need be use an swr meter to prove the antenna system is bad.

Hope that helped...

Geno

Aug 01, 2008 | Audio Players & Recorders

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