Cobra LI7200 I just received a pair of Cobra 2 way Model LI7200 and I cannot get them to work with each other. I can pick up other people sometimes but I cannot communicate between the two radios. We are on the same channel and the volume is turned up. The call and the talk to not work. I got the same problem with my cobra Li 6700 radios. One of them didnt't work with other radios, but the other one did. Obviously it's a manufacturing problem. I'm looking for the electronica schematics, since i opened my radio and i found to variable resistors and a variable capacitor. I'll try to find out if adjusting them my radio could come back to life !

Please don't touch any internal adjustments. It is like a 10 digit combination lock that is set to open. If you start changing the numbers, you will never get it open.
I think the problem is with your tone coded squelch (CTCSS). Your radio channel is like a telephone party line. If your CTCSS is not on, everytime you turn your radio on you will hear anyone on that channel that is close enough to hear.
If you are trying to use these radios for serious communications, that will drive you nuts to hear everybody else talking but not about what you need to hear. To try to mitigate this problem, CTCSS was created. There are 38 different codes. If you for example set your unit to operate on code 11 and your other unit is set to operate on code 12, you could not hear each other.
Now let's add a third unit set to not use CTCSS at all. Neither one of you will be able to hear this third unit but he can hear both of you. Now you set the second unit to code 11 like the first unit. Now you will be able to hear each other. The third unit will still be able to hear both of you but since he is not transmitting code 11, you still can't hear him.
If you are hearing some traffic, it is because they have their CTCSS set to the same code that you are set to. Look in you operators manual for CTCSS Privacy Codes. Set your radios accordingly and I think you will be in business. Let me know if this doesn't take care of you problem.