Will not transmit.

It can be several things. The type of radio, Business band, Ham or Consumer would help. This problem can happen easily. Depending on the brand and model the procedures are a bit different. The transmit frequency is correct since radios can "hear" you. Your receive frequency, or the CODE is different that the transmit frequency and code. These are two different things and must match the transmit information in order to turn your speaker on. To check, if you know how to put your radio into "monitor", you will be able to hear the other radios when they transmit. Then you know to only change the "code". The other unlikely thing is a blown speaker. 90% of the time it is the programming.

Several things need to be checked. Fully charged battery. Antenna, make certain it s tight and unbroken. Wiggle the antenna while receiving, if reception improves, it is the antenna or the antenna jack. Then wiggle the on/off vol switch, same thing, if reception improves, it is broken or needs to be resoldered. Then I check the speaker. Speakers gather metal particles, as they get more and more, the speaker distorts and it sounds like static. Use a powerful magnet, run it over the speaker grill and see if anything comes out. I put plastic wrap on the magnet for easy cleaning. It could still be a bad speaker. Last, I check programming. All of this is done at our shop regularly and I suspect most radio shops follow the same procedures, maybe in a different order. Post if this helps or not.

Can you see the s-mete if it has one moving up and down on any channel? Do you hear any audio at all? could be a couple of things. Bad mic switch or mic cable, bad antenna or coax, bad audio amp. To check the audio amp plug in a speaker to the PA jack, put the PA switch on PA then press the mic to talk. If it works the audio is fine the mic is good and the mic cable is good. Noiw plug the speaker into the speaker jack, do you hear anything? If not then your antenna or coax has a problem, fix or replace antenna or coax.

You say antennas,I assume co-phased,as long as they were installed correctly&adjusted for the lowest swr reading,we'll assume they are ok.Next step would be the radio adjustments ,there is a switch next to your meter that must be set to s/rf,another switch for cb/pa needs to be on cb and last the knob for mic gain needs to be set at about halfway to three quarters depending your voice level and mic type used..are you using the stock mic that came with the radio,if so you should be able to transmit..look at the meter when you key the mic and talk it should move with your voice.If your using an aftermarket mic such as a power mic,make sure the battery is fresh and the correct type,this may also not be wired correctly for your radio if bought second hand..next step would be taking vehicle w/radio to a reputable cb repair shop or technician to evaluate.Good luck and hope everything works out.

Assuming the antenna is mounted and grounded correctly,when you try to transmit/talk does your meter needle move to the right with your voice,if it doesn't make sure meter knob is set to receive/transmit or mod[modulate] does it move to right now,if not make sure the mic gain knob is turned up or if it is a power mic,is it turned up&have a fresh battery.The antenna light could mean high swr readings which you will have to adjust by tuning the antenna with the radio meter or external meter,you can search swr adjustment on your computer if unfamiliar..some antenna warning lights are factory set too sensitive but most times are telling you there is a problem.If all is set&tuned properly and you still can't get a local signal to respond, your radios transmit finals could be blown,which you'll need a qualified radio tech to determine..Good luck& 73's

poss. bad ground for antenna to radio? hook the radio directly to the battery not to the cig lighter!!

the problem could still be with your swr . If your jeep is fiberglass at the point where your antenna connects that could be the problem. move it to a point where there is metal to get a good ground plane and you should hear people talking.

Hi,

Appreciate the direct "Ask Me". If I may clear up your concern:

• you have two CB radios, one is a Cobra 29LTD and the other?
• both have received and both do not transmit;
• you have two trucks, one with a Firecracker 1000 antenna, and the other?

In any case and initially, TX (transmit problems) could be caused by:

• defective PTT/mic;
• defective finals/drivers;
• defective PL-259 connector/RG58 Cable;
• antenna grounding/SWR;
• other electronics internally
  

Please check the above. You may need an SWR meter, a watt meter and a DVM/VOM to perform the tests.

Hope this be of initial help/idea. Pls post back how things turned up or should you need additional information. Good luck and kind regards. Thank you for using FixYa.

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.

Hope that helped...

Geno

You Need to check and set you SWR on the antenna system. You may also have a bad coax or the ant studs ( mounting hardward ) for the antennas may be bad. It definally sounds like an ant/coax problem Good Luck
Ed
NC Electronic
Mills, Wyoming