Question about Cobra 25 LTD 40-Channels Base CB Radio

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COBRA 25 LTD spikes without keying mike

I "inherited" a Cobra 25 LTD. When you turn it on the needle spikes as if the Mic key were depressed. Any quick fixes/quick checks? Anyone in Atlanta who can check it out? I'm not willing to spend much, but I'll go a little for a local repair. Rick

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  • Cobra Master
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Buy a different cobra 25 4 pin mic and try that . If that doesn't work than you inherited a piece of junk .

Posted on Feb 16, 2015

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SOURCE: NEED HELP WITH MIC WIRING FOR COBRA 25 LTD ST

1 Shield 2 White 3 Red 4 Black if the radio keys up as soon as you turn it on reverse 3 and 4 I am not familiar with that mic.But the way I actually should have given you the wiring order is as follows:1Shield 2 Modulation 3 and 4 key up I hope this helps.

Posted on Feb 20, 2009

  • 26 Answers

SOURCE: cobra 25 uk ltd when mic keys needle spikes

It is important to ground the antenna well,get an swr meter and check the swr it needs to be less than 1.5

Posted on Jun 16, 2012

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1 Answer

25 cobra cb want key up when mashing cb microphone


don't mash it.get another 4 pin mic from a cobra 25 or 29 and see if it still happens. if it does then you have an interior problem with the keying diode and or resistor.

Aug 31, 2014 | Cobra 25 LTD 40-Channel CB Radio

1 Answer

When i try to calibrate my cobra 29 ltd classic the needle will not go to the right


make sure you have your radio set on CAL and then adjust the knob that says adjust .Turn it all the to the right then bring it back to the set point on the dial then un key the mic,move the switch to SWR , key the mic and that is your reading. Do this on channels 40 - 1 then 19. Make sure you write down the readings for each channel. The adjust your antenna from there.

Jul 05, 2014 | Cobra 29 LTD CB Radio

1 Answer

Its a cobra 25ltd when i key the mike sometimes it hangs keyed up and does it with defferent mikes so the mike is not my problem.


take some electrical spray cleaner and lightly spray the inside of the radio where the mic plugs in. could also be a keying diode.

Jan 04, 2013 | Cobra 25 LTD 40-channel Classic CB Radio...

1 Answer

Cobra 25 uk ltd when mic keys needle spikes


It is important to ground the antenna well,get an swr meter and check the swr it needs to be less than 1.5

Jun 13, 2012 | Cobra 25 LTD 40-Channels Base CB Radio

1 Answer

I have a cobra 25 ltd and when i key the mic the gauge of the db barley goes up. is something wrong ? also the gauge says its measuring tx power what does that actually mean/ do


TX means transmit. There are 3 settings for the meter. The top one is to measure your TX/RX that's transmit and receive. CAL is to calibrate the meter to check your SWR.

Reasons your needle may not be moving much when you key while on TX/RX. The dynamic is probably all the way down. That is your mic gain. If you turn that up when you talk the needle will swing more. If the radio is stock and not modded, you can turn this all the way up and leave it.

Also there could be something wrong with the mic. If people can hear you then its not the mic.

If people can hear you fine when you transmit, it may just be a bad meter. Not a big problem, you will just need an external meter to make sure you swr is not high.this is important because if it is over 1.5 you run the risk of blowing the final transistor.

Oct 11, 2009 | Cobra 29 LTD CB Radio

1 Answer

No one hears me but I hear everyone else for miles.


check Your mic. Might need replacing. also with all the changes in the past few years check it out fully. If you can program it you might want to reprogram it. Hope that helps You.

May 24, 2009 | Cobra 25 LTD 40-Channels Base CB Radio

1 Answer

NEED HELP WITH MIC WIRING FOR COBRA 25 LTD ST


1 Shield 2 White 3 Red 4 Black if the radio keys up as soon as you turn it on reverse 3 and 4 I am not familiar with that mic.But the way I actually should have given you the wiring order is as follows:1Shield 2 Modulation 3 and 4 key up I hope this helps.

Feb 18, 2009 | 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

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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