Cobra 142GTL cap changes

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Goldfinger
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Re: Cobra 142GTL cap changes

Postby Goldfinger » Mon Sep 11, 2017 6:40 pm

Receive:

Change C91,C28, C108 and C110 to 2.2uF-4.7uF non polarized
Change C 118 to a 1000uF, 25 volt Electrolytic, observe polarity
More highs? Make C25 lower in value



Transmit:

Change C121 to a 4.7uF, 16V Electrolytic or Tantalum, observe polarity
Change C86 and C82 to 2.2uF-4.7uF non polarized
More highs on transmit? Make C111 lower in value. (also affects receive)

* non polarized means Mylar, Polypropylene or non-polar Electrolytic
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Re: Cobra 142GTL cap changes

Postby 677KY » Wed Nov 29, 2017 9:05 am

Thank you very much Goldfinger!!!
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Re: Cobra 142GTL cap changes

Postby 677KY » Wed Nov 29, 2017 9:07 am

can polarized caps be used for the non polarized changes you posted?
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Re: Cobra 142GTL cap changes

Postby Goldfinger » Wed Nov 29, 2017 2:48 pm

If you measure which hole is more positive you can but I've found it still doesn't work much of the time as both sides of the circuit have some random + voltage on them and doesn't want to work right. It's easier just to get the right caps. I always use "new" caps when I modify a radio so I just order what I need/use.

You can make non-polarized caps: viewtopic.php?f=132&t=16426
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