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Re: 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!
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Most problems with radios that receive but do not transmit are antenna or antenna wire/connector issues. It's easy to receive with a marginal antenna but transmitting requires a good working antenna. If you have a SWR meter or can get your hands on one, install it in line with the antenna and test for reflected power. Of course, make sure your TX light comes on when you depress the mic switch. If not, switch mic and try again. Hope this is helpful! Reply if u can.
Check that your mic gain or dynamike knob is turn clockwise if it is full counter clockwise you will have no modulation with your tx power.
I would like to help but one sentence describing your problem can lead to a vague solution.
Be aware that not all 4 pin mikes are wired the same.
Stock 1- Shield 2- Audio 3- Transmit 4- Receive
Welcome to FixYa.
My name is John, and I will be assisting you with your issue today.
Turn your RF GAIN to MAX . Check that your antenna is grounded to the body.
Plug a EXTERNAL speaker in the back of the unit and see if you have sound.
If you have sound now, replace the speaker. Could be a few more things causing this, but
try this first, then let me know if you need further! Hopes this was helpful. Comments and Testimony
are always welcomed here. Thanks for choosing FixYa today and in the future.
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.
One of 2 reasons. First is common. Your mic or mic jack may be bad. The way the radio works, is the mic switch switched from receive and transmit. When the mic is not keyed then the switch is actually on receive, and when you key it, you switch it to transmit. So if there is something wrong with your mic, or it is not plugged in, the radio will not be in receive mode.
The next problem if a new mic doesn't solve the problem is...
there is an issue with your antenna or feed system. Make sure coax is good. Use an ohm tester. Make sure its not shorted.
Next make sure the antenna is good and tuned properly.
Sound like either an antenna problem, or a mic problem.
The mic on most cb's also serve as transmit/receive switching. A broken wire or bad switch in the mic or cord can cause either or both to fail.
If you have a bad antenna (or cable), you should still hear squelch noise on receive (maybe lower in volume) and be able key the mic and get a transmit light on the unit. Visually inspect the connector, cable and antenna. If need be use an swr meter to prove the antenna system is bad.