Question about Maxon MCB-30 40-Channels Base CB Radio

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No sound My c.b. transmits but either does not receive,or cant hear,tried an external speaker and it still does not work

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Re: no sound

You might have a loose wire in the mic plug, also in the plug itself there are 4 holes for 4 pins in the radio to fit into, these 4 holes have tiny metal sleeves in them to make contact with the radio pins. these sleeves are split and you can take a tiny jewlers screwdriver and slightly close up these sleeves this causes them to fit tighter on the radio pins creating a better connection. these sleeves WILL over time spread out causing the radio to lose a function such as receive or transmit I have encountered this problem several times in the past at my shop. Good luck on your problem.

Posted on Aug 01, 2007

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Re: no sound

Can anyone tell me how this can be hooked up to external car speakers?

Posted on Jul 09, 2008

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Re: no sound

The one I worked on had cold solder joints...the joints needs to be reheats very careful to make the proper bond.

Posted on Nov 22, 2006

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My cb radio is on but cant hear nothing sound is turn up but nothing come out

You didn't include the make / model CB you have, so I can only offer general suggestions. If these do not work, please provided the missing info.

Start out by locating and setting the the Volume to a position between 1/4 and 1/2 way clockwise, the Squelch to fully counter-clockwise and the "RF Gain" to fully clockwise to "MAX".

Check the position of the "PA / CB" switch and set to CB. When set to PA, both receive and transmit audio is sent directly to an outdoor speaker (instead of through the transmitter and antenna for reception by other radios). The PA speaker is usually connected to a jack at the rear of the radio. When the PA / CB switch is selected, the internal speaker is silenced even if there is no PA speaker connected.

At this point, you should hear static or voices (with an antenna connected). Do not attempt to transmit without a properly tuned antenna connected. If no sound is heard, there's something else wrong.

May 22, 2012 | Uniden Pc 78xl Cb Radio Mobile

1 Answer

Cant recieve or output , I bought a new cable and antenna plus a swr meter.

With an antenna connected, volume set to 1/4 from minimum, squelch / RF squelch fully counter-clockwise (or minimum) - do you hear anything from the speaker? If not - plug an earphone / external speaker into the external speaker jack on the rear - any sound? If not, do you see the S/RF meter needle moving (not resting on 0 or 1)? If not - find a channel with activity on as indicated by the S/RF meter first.

Try with another antenna connected if possible, or transmit with another CB radio on the same channel nearby - and try again.

If you aren't able to receive sound (not just static) - or indicated signals on the S/RF meter, the radio *MAY* need to be professionally serviced. Make sure you get an estimate for the work before authorizing - otherwise you may be spending more on a repair than the radio is worth. It is not uncommon to have to pay a diagnostic fee - that most shop will put toward the repair if allowed to do the work.

Good luck!

Sep 07, 2010 | Cobra 29 LTD CB Radio

1 Answer

My connex 3300 hp stopped reciving it transmits people can hear me loud and clear but I cant hear them radio was working fine then one day I turned it on and couldn't hear any thing.

Hi, my name is John. Try a external speaker, plug it in the back of radio, turn the RF GAIN to MAX. Turn the SQUELCH all the way to left, make sure the select knob is on CB, and on AM...try all this and if that's does not do it, let me know, I will post other steps here,.... hope this was very helpful....

Sep 02, 2010 | Connex 3300 240-Channels Base CB Radio

1 Answer

My cobra cb will transmit but not receive

not sure but on the back of mine their is a switch that alows for a external speaker if its set to that you wont hear anything mite try that, Good luck

Oct 12, 2009 | Cobra CB Radios

2 Answers

Transmitting and receiving

RF gain should be all the way up. Turn the squelch all the way down. Turn the ANL/NB to just ANL.

Turn the dynamic up at least 3/4.

Once you have confirm you can receive and transmit, then you can turn up the squelch up until white noise just stops.

Make sure you are on 19 by the highway. Key up and say break break one nine, can some one give me a radio check please.

you should get a response.

Your RF gain is how much you receive. the higher it is the more you receive. In normal operation there is no need for it ever to be less the all the way on.

Squelch is just to knock out fuzz, and if you only want to hear people close not far. A little less then half way is a basic setting.

the ANL switch is the automatic noise limiter. if you have interference from your vehicle, like engine noise, turning this on will quiet that. If it is extreme engine noise then switch it to NB, noise blanker. It is just a more intense setting.

your dynamic is how loud your audio is. if its low or all the way down, you will not transmit audio loud enough for people to hear. If its a stock radio and has not been tuned, if you turn it all the way up, that is fine.

Sep 26, 2009 | Cobra 29 LTD CB Radio

1 Answer

Cb problem have a cobra 19dx iv with a 2ft magnet mount cobra antenna swr is good, receive is good, but muffled output

Hi and welcome to FixYa,

Which output is muffled, transmit (modulation audio) or receive audio?

If you are referring to the receive audio, initially, have you tried an external speaker? If it works good, then it would be an internal speaker problem; if not then others to check would be:
  • IC1 - KIA7217AP audio IC;
  • CM 10 & 15 - audio output capacitors 470uF / 16V.
if it were transmit / modulation audio, try replacing the mic.

Please postback updates.

Good luck and thank you for asking FixYa.

Aug 01, 2009 | Cobra CB Radios

1 Answer


try the external speaker /if that is not working you may need put in a new receiving chip it is on the right side has 10 pins.

Jan 03, 2009 | Galaxy Radios DX-959 40-Channels Base CB...

1 Answer

Transmits but doesnt receive

If the meter shows that it's receiving something, the microphone may be the problem. Another possibility is the speaker & plugging an external speaker in would confirm this. Aslo make sure the squelch control is turned all the way to the left (counter-clockwise) & the RF gain is turned to the right (clockwise).

Jul 18, 2008 | Cobra 29 WX NW ST 40-Channels Base CB...

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