How to Adjust the Microphone Gain on the Uniden PC78XL CB Radio

The gain on your Uniden CB radio adjusts the sensitivity of the microphone. Follow these instructions to ensure you have correctly set the gain.

Instructions

Difficulty: Easy

Things You’ll Need:

• Uniden PC78XL CB Radio

1. Locate the microphone jack on the front panel of the Uniden CB radio. The microphone jack is the first item on the bottom left side of the Uniden CB radio. It is round and has four small holes in the shape of a square.
   
   
2. Find the end of the microphone phone cord. Look for the unit on the end of that cord that has four prongs.
   
   
3. Align the four prongs on the end of the cord with the four holes in the microphone jack.
   
   
4. When the microphone is in place, you will need to make sure the antenna and power source are correctly attached to the CB radio.
   
   
5. Power on the CB radio using the "On/Off/Volume" knob.
   
   
6. Set the knob at an appropriate volume level.
   
   
7. Select a channel using the "Channel" knob.
   
   
8. When transmitting, you will need to adjust the microphone gain in order to modify the sensitivity of the microphone. Adjust the "Mic Gain" knob, located in the middle of the bottom of the front panel.
   
   
9. Continue adjusting the "Mic Gain" knob until you reach the desired setting.
   
   

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