It lights up but does not tx or rx
Try changing your mic.
I would open up the radio and look for burnt traces, primarily by the output transistor and near where the power comes in. If you have another radio near by (within several feet) and it transmits on the same channel that your radio is on, can you hear it?? If you transmit on your radio, does the working one hear you? If you open your squelch, does it make noise?? If you transmit, does the RF power meter go up?? If any of these questions are YES, then there is a good possibility that your ANTENNA SWITCHING diodes are shorted or open. The TX diode is probably open and your RX diode is shorted. OR both. If the other radio is hearing you, and you are hearing the other radio, then the radio section is very likely OK. The diodes switching the antenna between RX and TX often fail, especially if there has been a lightning strike in the vicinity. It doesn't matter if your radio is on or not, or if you have a surge protector, a nearby lighting strike can take these diodes out.
If you don't have as much as a Channel number coming up on your radio, then the problem is most lkely somewhere in the radios internal power supply.
SOURCE: i have a Cobra 29
Have you tried using a different mic that you know is working properly? If it still has feedback, then someone has installed talkback. Take the top off, check for a resistor between external speaker and pa speaker ports. Remove resistor if it is there and that should remove the talkback. Hope this was helpful.
SOURCE: codra 29 nw ltd classic
Hook radio to antenna. Key radio. Pester nearest trucker for radio check on ch 19. Can trucker hear you OK? Can you hear trucker OK? then meter is bad or connection to meter bad.
Can you hear truckers, but they can't hear you? Final Output transistor is bad...
SOURCE: MY COBRA 29 LTD CLASSIC WILL NOT TX BUT RX VERY
Hi and welcome to FixYa,
Initially, check the final and driver, TR14 and TR15 using a transistor tester or ohmmeter..
Postback results.
Good luck and thank you for asking FixYa.
SOURCE: Red RX/TX and red ANT light on my CB
Well,first hand ,some cobra radio,s have red some have green RX/TX lights, but are you modulating? Some green lights turn red. What is your standing Wave on the antenna,s? You need to check it and the output of the radio. To do this you need a watt or field strenth meter. Can get one at Radio Shack. Your standing Wave is ok as long as it is below a 2. That has to be done on the antenna. ..hope this helps...
Testimonial: "Thx the rx/tx light is supposed to turn red I found out. Still trying to get the antenna prob fixed though."
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