When my friend pulled it out of his truck, it worked. It sat in his shop for quite some time, and now I need one. He gave it to me. Now it does not work.
It is a Cobra 18 Ultra Weatherband 3
It turns on and off. The mic works (seems to) since the TX light emphasizes when I push and talk. The channel selectection LED/lights are not functioning, so I do not see what channel I am on. I can push the channel buttons but the green number lights do not come on.
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You've probably already done this, but make sure all the basic settings are correct. CB-PA switch is in CB mode, Squelch is turned to the left, RF Gain is turned to the right, etc. After all that, and you still have nothing, I would try using another microphone. If you have a spare mic or a friend with a spare mic, borrow it. Just make sure its wired the same as yours is. (If it's a cobra 4-pin, it most likely will work.) Now if that doesn't fix it, then the most likely problem is in the MIC/AUDIO circuit. You'll need someone with experience to replace the necessary parts. In radio troubleshooting, always start with the basics: Correct Connections Proper input Voltage (Power) Correct Settings (Vol, Sql, RF-G, etc) Antenna (properly matched) I hope this helps a little...
somebody tampered with internal adjustors seems to me. you can take a screw driver and turn off receive for so many channels but crank it for higher band. It was probably locked on a upper channel for a Friendly chat station say Channel #28. Where they stayed and talked on 1 channel all time. Could be that. Maybe its got broke wires or board on that other set of channels or parts fried, chip bad etc. Get it checked out at CB shop. if you have any knowledge, turn IF to receive and crank up receive inside radio. If don't know anything take to shop..sounds like simple fix to me.
If the antenna is tunable, you definitely need to start out by having the swr set properly on the antenna. Also, make sure the plastic ferrel, (the small round white piece) is between the top of the antenna bracked and the antenna itself. It is there to make sure the antenna does not ground out to the vehicle. If the antenna is grounding out, it will be like no antenna at all. I have also had a few customers that have had broken coaxes straight out of the factory package on cheaper antenna setups.