what the number on the protection diode on a 29LTD classic...I can't read it looks like 1N4003? I need to put one in it. where can i get it?
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part number
- Thread starter sleepwalker
- Start date
The part number isn't all that important. It's a generic rectifier diode rated at 1 Amp. And that's the problem. The stock 2-Amp fuse will damage the diode the first time the polarity gets reversed. Even the brief 2-Amp surge overheats the stock diode inside, causing it to become a dead short.
We routinely use a generic 6-Amp rectifier diode, placed directly across the pins on the power socket. The end with the white band goes to the positive side of the power socket. This minimizes the damage the next time polarity gets reversed. Also, if the correct fuse size was in line, the new, larger rectifier diode WON'T be damaged.
Galaxy started doing this a few years ago on their 2-digit "DX" mobile models. Gotta figure it saved them a lot of warranty returns.
If your local parts supplier has a generic 3-Amp rated rectifier diode, it will be large enough for the 2-Amp fuse used for a Cobra 29. And the next time the polarity gets reversed, you won't have to take the radio apart, like you would if you use the stock 1N4001 1-Amp rectifier. At least, not if you use the correct fuse.
The voltage rating is not important. Since only 13.8 Volts is placed onto the protection diode when the polarity is correct, anything rated for 50 Volts or more will work exactly the same as a 1000-Volt rated part.
The bigger the diode's current rating, the likelier it is to survive the next time polarity gets reversed, and save you the aggravation of taking the radio apart. Again.
We routinely use a generic 6-Amp rectifier diode, placed directly across the pins on the power socket. The end with the white band goes to the positive side of the power socket. This minimizes the damage the next time polarity gets reversed. Also, if the correct fuse size was in line, the new, larger rectifier diode WON'T be damaged.
Galaxy started doing this a few years ago on their 2-digit "DX" mobile models. Gotta figure it saved them a lot of warranty returns.
If your local parts supplier has a generic 3-Amp rated rectifier diode, it will be large enough for the 2-Amp fuse used for a Cobra 29. And the next time the polarity gets reversed, you won't have to take the radio apart, like you would if you use the stock 1N4001 1-Amp rectifier. At least, not if you use the correct fuse.
The voltage rating is not important. Since only 13.8 Volts is placed onto the protection diode when the polarity is correct, anything rated for 50 Volts or more will work exactly the same as a 1000-Volt rated part.
The bigger the diode's current rating, the likelier it is to survive the next time polarity gets reversed, and save you the aggravation of taking the radio apart. Again.
IF it was blown using a 2 amp fuse! How many radios have you have to replace a whole bag full of stuff cause the guy had a 30 Amp in place??????? I've seen more than my share!
A guy once brought me a radio he hooked up with the power connection reversed and no fuse at all. :shock: The diode was blown literally into pieces and the hash filter chokes on the power leads were crispy and open.The chokes acted as fuses at God knows what current but that was the only damage done to the rig.It still works too and the amazing part is it is a Realistic model.
thanks all...the radio was never hook backwards I took it out to fix another radio that was and put the diode in backwards and it blew it..i just couldn't read the numbers on it anyways thanks Iill try to get one ....
...runna pile-up on 6m SSB