If you haven't received the answer by now you need a service manual to show you how much Voltage is required then make any adjustments and your radio should work fine .
SOURCE: cobra 29
Hi,
To my knowledge and depending on what board your Cobra 29GTL used, R46 is 47ohms dropping resistor after the switched 12V. Its output is then filtered by C20, 100uF/16V. While it is true that a shorted C20 would burnout R46, the issue is most likely a shorted FET2 (P/N 2SK104H). Should FET2 proved to be shorted, then it is very possible also that inductor/coil near FET2 is defective (LT-A108?).
Hope this be of initial help/idea. Pls post back how things turned up or should you need additional information.
Good luck and kind regards. Thank you for using FixYa.
SOURCE: my cobra 1000 gtl cb radio keeps blowing finals
Check bias and check your SWR. Also make sure your coax is not excessively leaky, and also check the loading coil inside the antenna to make sure the coil connections have not become all corroded and that their connections are sound.
SOURCE: i have an cobra 148 gtl no transmit
If theres no carrier its either the finals or driver. If theres no audio its the white wire in the plug that screws into the radio..its either broke or most likely come unsoldered. It keys but no audio.
Testimonial: "Thanks James an hour a go I have change the final and the drivers but still no transmit.Any suggestion more thanks"
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