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Hardwire an old ICOM IC-A21 handheld radio

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websurfshop(at)gmail.com
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Posted: Thu Mar 29, 2018 8:43 pm Post subject: Hardwire an old ICOM IC-A21 handheld radio

I would like to provide power to an older ICOM A21 handheld radio in my plane outfitted with an B&C SD-8, in the case of radio battery failure.  The radio came with a wall plug AC to DC adapter that puts out 13.5v at 1000mA.  How can I hardwire power to the radio and make sure it limits the current so I don't smoke my radio?  Can I just cut the cord off the AC-DC adapter and run it to a fuse block with a 1 amp fuse?

Thanks,  David

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ceengland7(at)gmail.com
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Posted: Thu Mar 29, 2018 9:03 pm Post subject: Hardwire an old ICOM IC-A21 handheld radio

The radio will only draw the current it needs, as long as the voltage isn't too high. The fuse protects  the wire. 1A fuse would be marginal, since you can expect the radio to draw somewhere near the design output current of the supply. 

 Cut the wire off the adapter, connect through a 2A fuse to the a/c bus. Or better, just buy the proper connector and some wire, and keep the existing power supply intact.

 Charlie

 On Mar 30, 2018, at 12:48 AM, David <websurfshop(at)gmail.com (websurfshop(at)gmail.com)> wrote: 	  Quote: 	
		   I would like to provide power to an older ICOM A21 handheld radio in my plane outfitted with an B&C SD-8, in the case of radio battery failure.  The radio came with a wall plug AC to DC adapter that puts out 13.5v at 1000mA.  How can I hardwire power to the radio and make sure it limits the current so I don't smoke my radio?  Can I just cut the cord off the AC-DC adapter and run it to a fuse block with a 1 amp fuse?

Thanks,  David

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