Question about Cobra 148 GTL 120-Channels Base CB Radio
A while ago my Cobra 148 was borrowed and wrecked. From what hes told me he reversed the polarity "by accident" im just wondering if there is a dummy diode or other saftey features to stop perminent damage. Cheers. Dan
Like Benimur said, most all newer units have a protection diode that is there for the purpose of protecting the radio when the power cord is pluged in backwards. It doesn't take much to fix them, only a $.02 diode. Most cb shops only charge between $10 to $15 to repair them.
Mt. Vernon, TX
Posted on Jan 23, 2008
Most if not all CB radios have a reverse protection diode soldered immediately right after the power connector. Its purpose is to provide a practical short if the wires are connected wrongly to a power source. This would cause the fuse to blow. The diode normally goes bad after a reversed polarity connection and therefore would need to be replaced. This diode is not in series with the B+ line but connected parallel to the power.
In some instances, other components would also fail: Power capacitors, Audio IC, TX finals and/or the switching/regulator IC.
Hope that this be of some help/idea. Pls post back how things worked out or should you need additional information.
Good luck and kind regards.
Posted on Dec 17, 2007
No non at all. Think im gonna have to send it off to be honest. If the protection diode had blown i dont think i'd get any life from it at all. Thanks for all your help though. Great site!
Posted on Dec 23, 2007
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