I have a cobra 29 nw classic and the problem is when I key up and let off the mic the radio stays transmitting but with no sound, I have changed the mic numerous times and all still do the same thing this just started happening and the only way to clear it so I can recieve again is to shut the radio off. other than this people can hear me fine and I can hear them fine.
What happens if you "key up" and "let off" and the transmitter "hangs", you remove the microphone plug from the Cobra ? Will it still be transmitting or will it stop ? If it stops, the problem is in the microphone with a "hanging" switch which you can easily clean or replace. Iif it keeps transmitting while the mike is disconnected, there is a problem with the Rx/Tx switching circuit. This needs further investigation by use of a circuit diagram.
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Turn the squelch all the way down to the point that you can hear the hissing from the speaker, when you release the transmit button on the mic you should hear the noise from the speaker and at that point the EXTERNAL METER should not be showing anything. IF it is then the radio is not stopping transmission when you release the microphone button. Instead of letting go of the microphone button, try unplugging it and see if it does the same thing. Also to note the SWR that you are showing when transmitting is not that high. Also can you post the make and model of the SWR meter that you are using?
If you take your external speaker and plug it into your PA jack in the back and key up your mic do you hear anything. If so then its not your IC chip if not its your IC chip and it will need to be replaced.
Hi, Great radio when it works. If you have your settings on CB - not PA - -be sure that your Cobra has that setting selected. If CB -is selected and still nothing - be sure you have a working mic. These wires are fragile and can break internally. One easy way to check is to borrow a cobra mic or even drop by a CB repair shop and ask them to do a mic check with the mic - it is free.
If you have a bad mic replace it and all should be well. If your mic is good and it still doesn't transmit you will need to replace the finals in the unit. It is common that these burn out of you got too close to someone with too powerful a radio. The CB shop will need to look at it further and repairs should not be over about 40.00.
Sounds like you may have a leaky or shorted capacitor somewhere in the power circuits, or a defective transistor in the same circuits since it affects both the transmitter and receiver. Common problems with receive and transmit intermittance can also be the antenna or its connections. The fact that it goes away if the radio is turned off, then on again after a short time points to something common in the power supply section. Unless you have test equipment and a working knowledge of electronics it will be difficult for you to troubleshoot on your own.
Try switching a different mic, sometimes the transmitting wire comes loose inside the connector. If you are handy enough, you can even unscrew those two tiny screws on the end of the mic cord and see if a wire is loose and if so, solder it back into place.