Maybe the internal "memory" battery. Not easy to get at with the small parts
involved.
Might have to go back to Alinco for a replacement

See URL

http://www.explorerforum.com/forums/...p/t-90543.html


Where someone had a hacked up a DR-590 when someone tried to replace the
internal battery

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wrote in message
oups.com...
have an Alinco DR590. I replaced the battery in it. I can turn it off
and back on and it stays on the channel I left it on. If I turn it off
and leave it off for an hour or so it always goes back to 145.000 and
445.000.


It is constantly hooked up to my 12 volt battery.


What could htis be?