Question about Cobra 25 LTD 40-Channels Base CB Radio

1 Answer

Works sometimes and sometimes it doesnt.

My 25 will work sometimes and sometimes it will not. When it doesnt work the mic wont even key up. The power is fine and so is the coax. I have a cobra dynamike and it has a new battery. Any ideas.

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  • darkside9 Jul 20, 2008

    I looked at that but didnt see anything that looked bad. but then again I could have over looked something. Thanks for the advice.

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Sounds like a "cold" or broken solder connection on the PC board.

Posted on Jul 20, 2008

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My advice would be to obtain (borrow?) an USB headset (headphones with mic), and see if the problem occurs with them too. If not, you have a faulty mic input and will need to purchase such USB headset and enjoy.
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The Mic is found next to the power button.. to the left look for a small pinhole,, ....try pushing down to the right side of that.. test Mic when you do this,,,

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Cb is Keying Down instead of keying up when trying to talk


if you are transmitting fine Don't worry about the meter. Get an external SWR meter, they are better anyway.

Also, make sure the the switch next to the meter is all the way up on s/rf setting. thats for signal power and receive strength.

Aug 30, 2009 | Cobra 29 WX NW ST 40-Channels Base CB...

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The mic doesnt work ...it use to but all the sudden it quit doesnt even key up so i can hear it my talk back


First, try another mic on the radio to be sure it's the mic and not the radio causing the problem. If it's the mic, check the wiring circuits for a bad switch or broken wire. Simply...the TX circuit is closed and the RX is open when the key is squeezed. The RX circuit is closed and the TX circuit is open when the key is released. Use a simple ohm meter to check for resistance between the pins on the mic (after removal from the radio of course). Open circuit will read 1, closed circuit should be very close to zero. You'll probably find the TX circuit never closes when the key is squeezed. Could be a broken wire or faulty switch in the handset.
Also check...If the mic "keys up"...you see the meter move normally, but no voice...it's either a faulty mic element (the little round thing you talk into) or the audio circuit of the radio has a defective component which a good CB shop can replace.

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When mic is keyed, TX light illuminates but power meter does not


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Cobra 25 ltd wx classic


the mics on these cobras have a receive wire in them so the transmit will still work even if the receive wire is broken,if this wire is broken the unit will not make any sound...........remove the plug from the radio end of the mic and check the connections on the 5 pin connector.....(could be a cold solder or broken wire) or try a new mic or one that is proven work on another radio
hope this helps.................good luck!

Dec 18, 2008 | Cobra 25 LTD 40-Channels Base CB Radio

1 Answer

Cant transmit


Hello Darren, Yes it sounds like the mic is wired bass ackwards,,! A cobra 25 mic wiring is
PIN #1- Shield or ground wire
PIN#2- Audio or Transmit modulation
PIN #3- Transmit or Dead Key
PIN #4- Receive Audio.
When your keying the mic, the RX wires are being connected to make the RX work,,,
*** Let me know how you get along with it. Either buy a new mic wired for your radio or you or someone comfortable with soldering needs to resolder the correct wires back on the mic plug,,,Like I said, let me know and have a great day,, Mechanic is back quiet!

Oct 21, 2008 | Cobra 25 LTD 40-Channels Base CB Radio

1 Answer

Audio feedback


put your mic on mute for playback. So the mic works but it doesnt play it from the speakers at the same time.

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If you dont see microphone on the list click on
options then settings
put a X on the playback -> microphone.

close settings

its now shown in the panel, click on mute and it wont feedback the sounds to you anymore.

May 09, 2008 | Acer Aspire 3000 Notebook

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No sound


The Cobra 25 requires the mic to be working for any sound to come out. My suggestion is that you first try a new mic. If this doesn't work, look real close at the board on the soldered side ( around the if section, thats the area that right under the waxed area on the component side of the board ) for cold solder joints ( broken lead solder) You may need a magnifing glass. Good Luck
Ed
NC Electronic
Mills, Wyoming

Dec 17, 2007 | Cobra 25 LTD 40-Channels Base CB Radio

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