Question about Cobra 148 GTL 120-Channels Base CB Radio

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No sound radio recieves and transmit according to meter in radio but no sound thru speaker or external speaker.

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  • scott3696 Mar 05, 2008

    yes i tried other mics and it does transmit fine

  • scott3696 Mar 05, 2008

    everything is attached and switched right i did notice if you lay a finger on a few solder points you can get some sound out of it like a humm and regular audio from another radio talking

  • Dean Dishman May 11, 2010

    Have you tried another mic?Can anyone else hear you ?

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Sound chip may have overheated or gone bad or a capacitor near volume knob..That chip has over 16 prongs and is soldered with a heat sink to one side of chassis..Sucks! Get another radio or have it serviced. Changing parts may be long & studious. May be transistors,Ic chips or capacitors..If you have all the time or solder equipment and parts. desolder blue or black capacitors changing each one(electrolytic +- types) change small black transistors with equal values and resistors near Ic chip and Ic chip(hard to do) it has lots of prongs and heat from solder gun may destroy board or Ic chip(if you have a fine point tip and carefully do it and put it on its heatsink proper with heatsink resin putty(it may work again like new. Bad mics sometimes cause sound to go bad. Audio wires run through mic also. *Change mics* first then look at circuit board..Hope u good luck

Posted on Feb 25, 2013

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Take off bottom cover and see if the speaker wire came off.make sure its on cb and not on pa and make sure its plugged into the right port

Posted on Mar 05, 2008

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Got an A. P. Hill that will transmit and recieve but, no sound from the speaker or the external speaker jack. I connected my SWR/POWER meter and i get power out but, nothing thru the speaker even with the...


Here is a quick way to test to see if it is the speaker. Use a multimeter and set it to Ohms. Unsolder the two wires off of the speaker and touch the pos terminal on the speaker with the pos terminal on the multimeter on the multimeter. Touch the neg terminal on the speaker with the neg terminal on the multi meter. The meter should spike a bit and might crackle a bit as well. This says speaker is good. So then you know the problem is most likely the Audio Output Transistor (IC) In your radio you will look for IC8 on the board. It will be marked. Looking towards the back of the radio on the right side it will be a fairly long chip. The good news is that you can purchase one and install it if you are handy with a soldier gun.

Mar 11, 2011 | Connex 3300 240-Channels Base CB Radio

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

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

2 Answers

President HR-2510 will not transmit or recieve


Hi Darrel,

Since you didn't say if you have ever used this radio successfully before, I have to assume it is "new to you" and that you have never seen it work or used one like it before. Start with a few basic settings below:

Turn Squelch to minimum.
Set RF Gain (if present) to maximum
Set Mode to AM or FM
Set volume to 1/3 up
Connect to 50 ohm dummy load.

Turn power on. Hopefully you hear static. If not, try SSB or FM. Still nothing? Try connecting to an external speaker.

Chnage back to AM or FM mode. Key mic check & for transmit indicator. If none, change mic or manually short the PTT contacts in the mic or at the radio to see if it can be made to xmit.

If no xmit - insert SWR meter between xmitter and dummy load. Try to xmit on AM or FM again while watching SWR forward power, if none indicated, xmitter is probably defective.

Replacing parts in a xmitter is not recommended. You'll need an FCC license and a fair amount of expensive test equipment to test repairs, set power levels and deviation and perform an alignment to be sure you aren't causing interference on other frequencies and bands.

You'd be better off bringing it to a radio repair shop for repairs and an alignment.

Sep 29, 2009 | Uniden Radio Communications

3 Answers

The power is on, however, when I use the mic and speak the "needle" doesn't move, I have tried different mics. Also, the sound coming from the radio is also very soft.


When you say the sound coming from the radio is very soft, are you talking about talk back? if so, you want that soft. If you are talking about reception then just get an external speaker.

If the radio is working, and transmitting ok, the meter is not important.

You may want to get an external meter to make sure SWR's are good.

If it is not transmitting at all, there could be a real problem and the radio needs a tech.

Aug 14, 2009 | Uniden Bearcat Pro PC68XL 40-Channels Base...

1 Answer

158edx,no recieve audio


Most of these kinds of radios will have two audio chips , on for transmit and one for recieve.sounds like you popped the recieve audio chip.

Feb 07, 2009 | Superstar SS-3900EGHPA CB Radio

1 Answer

No sound


It must be a bad internal speaker, but also check the external speaker jack for broken solder. Good Luck
Ed
NC Electronic
Mills, Wyoming

Dec 31, 2007 | Galaxy Radios DX- 88HL Base CB Radio

2 Answers

Unexpected problem


I think you can have problems with the speaker, if you see the signal display working when you reiceve the VCO is working. If you could check (I dont remeber if this radio has audio connectors) external speaker. If this radio has an audio conector, this conector switches the internal and external speaker and could be dirt and is not switching to the internal spk.

Jul 29, 2007 | ICOM Informatique Icom Radio U16, IC2GAT,...

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