In article
e.rogers.com,
"Peter" wrote:

I have a question about this radio. If I plug the AC jack in the wall
and I have the 12 volt connection hooked up to a battery as a power
failure backup will it damage the radio? Is there an internal switch
to protect it from both sources being connected at the same time?


I looked at the manual and could not find a definitive answer to your
question. I would not try this until you get an answer from Drake
support.

Phone: 937-746-6990
Email

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Telamon
Ventura, California