Question about Cobra 25 LTD 40-Channels Base CB Radio

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I have a cobra cb and it makes a weird sound all the time, when i accelerate the sound gets biger

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Turn NB/ANL switch to the 'on' position. Go to Rat Shack or other electronics store and get an in-line noise filter for the power line.

Posted on Mar 24, 2009

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What you are getting is ignition noise from the engine of your car. Could be spark plug noise or alternator whine. If your radio has a ANL or NB switch, turn it on. If that does not fix it, you may have to get a filter for your powerline or change where you are getting power for the radio. Hope this helps, with the limited info available. Let me know,,,Mechanic

Posted on Oct 31, 2008

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1 Answer

My cobra 1000 gtl cb radio keeps blowing finals


Check bias and check your SWR. Also make sure your coax is not excessively leaky, and also check the loading coil inside the antenna to make sure the coil connections have not become all corroded and that their connections are sound.

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I am just wondering how to fix the sound on a cobra 21 wx cb radio


most often what causes a cb radio to have no sound is a bad Mic. some times the solder joints on the Mic plug break beause it.moves around a lot over time. if th RX wire breaks off the radio will not go into receive mode and you will hear nothing. try a different Mic

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I have just bought a new Cobra CB DX IV (i think) and truckers say i sound like garbage. I have tuned the antenna.


truckers also like it to have 300+ watts,, and don't tell them what you have and see the difference. lol

also the stock mic's are tinny sounding. trade it off for a good power mic like a cobra 75 $17.99 or any type of echo mic $35 i think.. those will make it sound like a big radio.., also check the SWR's !!!!! free at any cb shop to have them checked .. we don't charge unless it needs parts.

Feb 12, 2011 | Cobra Radio Communications

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I bought this from a buddy of mine then my other buddy hooked it up for me and the sound isn't workin and I think the speaker is broke or whatever you know. Are the speakers sensitive?


First, this is the worst radio Cobra ever made. I don't know why they still make it. Its horrible.

You probably have got a bad mic, or a break in a wire in the mic cord. With out a properly functioning mic, the radio will not go into receive mode. Thus you will have no sound.

I wouldn't waste money on a new mic for that radio. Instead save a little more money and get a cobra 29. its a much better radio. Also, if you haven't, when you get the cobra 29, read the part about SWR in the manual.

You must tune the antenna. If you do not, you will destroy the radio over time.

Sep 25, 2010 | Cobra 18 WX ST II 40-Channels Base CB...

1 Answer

I have a Cobra 18 wx st. I am not able to transmit anything on it. I have checked the antenna cables and and all external connections. I receive all the wb just fine but the CB gives me nothing. I tried a...


That's usually a defective amc stage that produces RX audio and TX modulation. It's an integrated circuit that will require a tech fixing it. You will have a transmitted carrier with no modulation, and no sound in your speaker. However, make sure you have a good mike plugged in first, and substitute a known good mike to verify it's not the mike. With the WX band working, the above may not apply.

See if you have a carrier...signal going out, but no modulation. Get your Tech to check the mike wiring/circuitry inside the radio, also.

Jul 06, 2010 | Cobra 18 WX ST 40-Channels Base CB Radio

3 Answers

My 18 WX ST Cobra CB radio will allow me to receive sound from the 3 weather stations it has on it, but I cannot pick up sound from other CB radios. help please?


get an swr meter and check your antenna first. if good problem may be in the circuit board.. they are famous for loose IF, TX mixer boards. or call us

Nov 03, 2009 | Cobra 18 WX ST 40-Channels Base CB Radio

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Need wiring digram for road king 56 to cobra 29 cb


He is actually looking for the Microphone wiring which is a roadKing Mic to the Radio Cobra 29.

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1 Answer

Fuzzy or static tranmit


I know this may sound like an odd answer, but what are your SWR's? If they are high, you will experience some WEIRD audio problems.

Jan 10, 2008 | Cobra 150 GTL DX Base CB Radio

1 Answer

NO sound


Make sure the switch is in the CB position. If this is so, then you may have a bad switching transistor or a bad diode in the board. Also on some of the weather band cobras I have worked on in the past, I have found bad pll chips. Good Luck
Ed
NC Electronic
Mills, Wyoming

Dec 30, 2007 | Cobra 148 GTL 120-Channels Base CB Radio

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