I can't hear through my internal or external cb speaker
I just recently found out I can't hear any RX transmissions through my Uniden PC78ELITE internal speaker or my external speaker. Everybody at work can hear me talk and my needle moves when they talk I just can't hear them. I am at a loss. All connections seem to be tight but I wanted to know if it is something inside. I sodered my external speaker wires and replaced the mini jack hoping that was the problem but that didn't work either. Thank you for your time and I hope you can help
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Re: I can't hear through my internal or external cb...
Can you hear static when the squelch is at minimum ?. If you can hear static then tere is nothing wrong with the audio system.
If you are sure about the squelch, connect goosd speaker directly to the 2 wires coming from the main board bypassing the speker jack. if there is still no sound then the audio amp chip is defective.
The audio amp can only be damaged if the output is shorted for a long period of time.
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Does it have an external speaker plugged in the back? If so try unplugging it see if the internal speaker works, if it doesnt have an external speaker plugged in try one, maybe the internal speaker went bad from moisture.
What kind of antenna is it? Have you checked your standing wave? To do this process you will need a field strenth or a SWR meter to do it,would be cheaper to have it checked at Radio Shack or you can buy one,and do it yourself. Some radio antenna light come on when transmitting,....hope this helps....
Try it with an external speaker. The external speaker jack receives the audio from the scanner before it goes to the internal speaker. If the jack thinks there is still something plugged into it, the audio to the internal speaker is interrupted. If the jack is stuck, it may still work with an external speaker.
If it seems to be locking on a channel like someone is talking but no sound, it's possible that the speaker quit working. Simply plug in an external speaker into the plugin on the back. I have a BC 860 that the speaker recently quit. That's what I did and it sounds better. Good luck Mechanic
This is a link to your old post re SWR 3....http://www.fixya.com/support/t180697-pc78_elite_cb
As stated SWR 3 is too high, it should be 1.5 or lower. Fiberglass antenna are kinda notorious in setup and experience wise have not performed well or at all. Maybe you should try a different antenna (metal rod). Some good brands/models I have tried with very good results are K40, Hokushin, Comet, Oscar, Maldol, Daiwa.
To check if you can receive, stick an ordinay length of wire ('bout 9' long) at the center of your radio's connector. RX should work (pls don't key the mic or TX).