How to register set for radio through ear phones

if you just bought them, return the one that isn't working right for a replacement. it appears that there is a defect with that one, possibly a loose wire or bad circuit.

It seems to be that the antenna is at fault. If you can take it apart, you should resolder the antenna.

this is an oxmoron you cant have checked every thing

left and right ear audio on CBs come from a common mono signal

so the right ear signal is missing or the headphone on the right ear piece is busted

sherlock....

Please check ur phone settings

Many devices will automatically switch off the large speaker when ear phones are plugged into them. Also there may be a switch or button or prompt on your radio to switch between regular speaker and ear phone jack. Look for that first.
Try connecting and disconnection ear phones while listening to a station and see if the problem is intermittent. If is works sometimes but not every time then it is most likely an internal connection.
You will have to access the inside of the radio to investigate further. Connect a working external music or sound source with speaker wire to the terminals inside the radio that connect to the radio's speaker. If the radio's speaker works with the external sound source then you know it is a bad connection inside your radio. If the radio's speaker does not work with the external sound source then it is most likely a faulty radio speaker. Look closely for a broken solder point or broken/disconnected wire.

It could be faulty, but try a different set of ear phones first. If the sounds on this set of ear phones are also low then the MP3 player is faulty.

Do you have the ear piece plugged in when you try to use the radio?
The ear piece is the antenna for radio

Did you try plugging in the audio device before turning on the radio? If so, follow this by pressing the PTT on the radio once. It should clear the problem.

put a new socket in to your phone and check your service manual for your setting for your phone and correct it.

Good Luck
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Put your ear really close to the phone and speak to it by saying radio on