Question about Cobra 25 LTD 40-Channels Base CB Radio

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Just a thought from Mechanic

Have him also try a Pa test with the spkr plugged in the pa slot to see if the mod section is working or not. Is the radio TX modulating? if so, wouldn't the chip still be good? One other thought, maybe the legs of the spkr jack is pulled loose from the circuit board. Good luck with it,, Mechanic

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Well, first your pa does not go thru your audio chip,take the cover off,with the radio circuit board down, the audio chip is on the right side-rail,the chip close to you, now turn it over and inspect it for cold solder joints,if you need to replace it you have to heat sink it with heat sink silicone, to remove it you need wire wick,it soaks up the solder,make sure you clean the old off with a paper towel,use 60-40 rosin core solder........hope this helps.....

Posted on Mar 12, 2010

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1 Answer

CB Plays out PA Speaker


it is possible that the PA speaker output is intended for a normal (unpowered, unamplified) speaker. Perhaps in your case the audio you hear from the PA speaker is only signal leakage from the PA Speaker connection.
To know.. connect a regular speaker to the PA speaker connector (any speaker, home audio, old car 6x9....). If the PA works and drives the temporary speaker OK, and you hear no CB receive, then the PA output is for a normal speaker, with leakage of CB audio.
It is just a guess, but easy to try.

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CB in Receive Mode Plays Out the PA Speaker


no,its supposed to work that way so you can monitor it while you are outside your vehicle.

May 04, 2014 | CB Radios

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CB Plays out PA Speaker


Are you following the user manual that came with the radio?
NB-ANL/CB/PA SWITCH: When the switch is in the NB/ANL position, the Noise Blanker (NB) and Automatic Noise Limiter (ANL) circuits are activated.
The Noise Blanker is very effective in eliminating repetitive impulse noise such as ignition interference. In the CB position, the PA function is disabled and the radio will transmit and receive on the speaker that is connected. In the PA position,
the radio acts as public address amplifier. Your voice will come out of the speaker that is plugged into the PA. SP. jack on the rear panel. The radio does not operate when you are in the PA mode.

When you plug a speaker into the ext. jack does it kill the radios internal speaker? It should until you unplug it; if not and you are following the about you may have a wiring issue with the jacks.

May 04, 2014 | CB Radios

1 Answer

Galaxy dx 44hp, no am audio or mod ,fm & pa ok


Have you tried another mic. First guess microphone wire broke or broke solder for audio wire in mic jack at mic cord.

Mar 26, 2014 | Galaxy Radios DX-44HP Mobile Amateur Radio

1 Answer

Pa problems


look on the back of the radio. See those two holes that you can plug a speaker into, well one is for CB the other if for PA. plug your Pa speaker into the appropriate connector and you have Pa capeablity. You must turn the switch to pa on front of radio.

Mar 24, 2014 | Cobra 18 Ultra Weather Band Cb Radio 40...

1 Answer

Cobra 29LTD speaker inop....No audio at all. Speaker Ohms out ok as do speaker leads from board to speaker. External speaker jack is inop. PA works in PA and CB modes. Other than speaker issues, radio...


There are some different things you could be facing like:
the speaker sound being cut-out by the mic switch, but my first guess is the switch in the external spkr. jack being faulty. Here is a schematic for you.

http://xbones_antennas.tripod.com/id21.html

Apr 12, 2010 | Cobra 29 LTD CB Radio

1 Answer

Cobra 142 gtl no audio on receive work on pa, an on ext spkr get talk back,,,,but there no talk back in radio.... no audio on int spkr. tx good...


Hi and welcome to FixYa,

Initially, the speaker of course has been checked?

Offhand, would partial schematic of the mic and speaker section help?

7008f3b.jpg

Good luck and thank you for asking FixYa.

Dec 18, 2009 | Cobra CB Radios

1 Answer

CB radio PA speaker


Freddy, hello. The first thought that comes to mind with your problem is that if the 29 is an older model, the audio circuit or audio chip could be tired. If your talking about the receive volume being low thru the ext. speaker, then there is a rx. wire inside the mic cord. When it breaks, it cuts the volume in about half. The rx. wire is on pin # 4. Maybe your using the wrong ohm value speaker. You need 4 or 8 ohm. If you are refering to the outgoing modulation being real low, then the radio mod. has just been turned down to 50-60%. That's about all I've got for now, not being able to actuallly see the radio,,, Have a good day, and let me know how it goes,, Mechanic

Oct 22, 2008 | CB Radios

1 Answer

PA speaker quiet


I think this is a double post,, am I right Freddy??? Mechanic

Oct 22, 2008 | Cobra 25 LTD 40-Channels Base CB Radio

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