Is there a 651S-1 mod that retains the last listening frequency when
the radio is turned off? Now I get ".0000" each time I turn the radio
on, regardless of what frequency I was tuned to when I turned it off.
A youtube video shows the radio coming up tuned to 20 meters when it
is turned on: how is this implemented?

I added a 6 VDC source to the terminal strip on the back, and that
retains the frequency when I unplug the radio, but when I turn it off
using the power switch it still comes up .0000 when I next turn it on.

73,
Jeff
N6MNI