Question about Cobra LI3900-2DXVP (14 Channels) 2-Way Radio
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Posted on Jan 02, 2017
If radios are brand new then I would take them back to the store for warranty exchange. The other opton is to vist a local radio service center and ask the tech to jump the battery. if the battery falls below a certain voltage it might need a quick jump sart from a power supply with a higher voltage normally 12 volts works well...
Posted on Aug 20, 2008
First put the dead laptop battery in a zip lock.
Then put the zip into refrigeratory and keep it in freezer for 14 - 15 hours.
Afer waitinf for a long time, take the dead laptop battery out of refrigeratory .
Using clean and soft cloth to dry the battery and get the battery to room temperature (about 20° - 25°)
In the end fully charging and discharging the battery for 3 - 4 cycles.
Now you would see that your dead battery holding up charge for 1-2 hours.
See the detail video in metacafe.com
View more info in : http://www.laptops-battery.co.uk/blog/revive-dead-laptop-battery.htm
Posted on Dec 18, 2008
It seems that ur adoptor is not ok , u can save the money by purchasing any 9 V adoptor, It available for less than 1 USD in our country ..& cut the wires of ur budled adoptor & fix them in correct polarity with the wire connecting the charger base ..( before doing this proces check voltage output from adoptor by using a multimetre.)
Posted on Apr 12, 2009
SOURCE: Cobra LI7200
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.
Posted on May 29, 2009
SOURCE: my charger will not charge
1) Clean the battery contacts on the radio, battery and charger with a pencil eraser.
2) Test the charger by turning the radio on while attached to the charger (do NOT transmit, as this may cause damage to the unit). If the light on the charger comes on while the radio is turned on, you have a good charger, and a bad battery.
3) If the above test detects a bad battery, replace the battery.
4) Not sure if the battery is bad? Trade the battery out of a known good unit into this one to see if it solves the problem.
Posted on Mar 11, 2010
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