A manual link is at the bottom of this entry. Troubleshoot the problems you've described:
Meter Not Working:
The needle moving slightly to the right when you key the mic could be due to incorrect calibration. Make sure to recalibrate the meter according to the manual instructions. If you calibrated it differently, that might cause the needle to go against the right side of the meter.
Recalibrating the meter should resolve this issue.
Meter Light Problems:
If the meter light isn't working, consider replacing the LED. Sometimes, a burnt signal meter light can occur. Replacing the LED should fix this.
SWR Meter Not Working:
Incorrect SWR calibration or bumping the calibrated knob might cause the SWR meter to malfunction.
To check the SWR meter:
Turn on the SWR calibrate knob until it keys up all the way at the end.
Switch to SWR mode and key the mic.
If the needle barely moves, turn down the Dynamike knob.
Finally, switch back to S/RF mode.
No Receiving Audio:
If you're not receiving audio, check the following:
Ensure the squelch knob is adjusted correctly. Start with the knob counterclockwise and turn it slowly clockwise until white noise stops.
Verify that the microphone is working properly. You can try a different mic to rule out any mic-related issues.
Make sure the radio is on the correct channel for transmitting and receiving.
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Calibrating the SWR (Standing Wave Ratio) meter on your Cobra Classic 29zLtd CB radio is essential for optimal antenna performance. Follow these steps to calibrate it properly:
Prepare the Setup:
Park your vehicle at least 20 feet away from trees and buildings.
Close all doors, hood, and trunk.
Choose the Channel:
Select the channel you want to check. It's recommended to test on channels 1, 20, and 40.
SWR Calibration:
On the radio, press the SWR/CAL button until the display shows "CAL."
While pressing the transmit button on the microphone, turn the SWR CAL knob (the last knob on the right) until the meter needle aligns with the "CAL" mark.
Release the transmit button.
Switch to SWR Mode:
Push the SWR/CAL button again until the display shows "SWR."
Read the SWR:
Press the transmit button on the microphone.
Observe the SWR reading on the top scale of the meter.
Ideally, the SWR should be below 3. Lower values are better.
Remember that SWR is a measure of antenna performance, and poor SWR can be caused by the antenna, antenna cable, or installation. Adjust the antenna length to achieve similar SWR readings on channels 1 and 40 while keeping it below 3. Most antennas are adjustable; refer to the manufacturer's instructions for specific adjustments.
cobra-29ltdclassic-cb-radio-user-manual.pdf (roadtrucker.com) MANUAL