Sangean ATS-606A - Manual (Page 37)

3.Press the button marked " M" (memory), display
"M" and suggested preset number will flash for
12 seconds. If preset 1 and 2 have been stored,
it will suggest preset 3 at this stage, on display
preset 3 will flash.
4.Press "ENTER" button and your station will be
stored in that memory position.
36
M
TIME SET
SW
M 1
SW
M 1 2 3
2 3