RobnzBoy ) writes:
The tuning knob is the large black knob with the red mark at the 12:00
position. The knob doesn't turn all the way around, though. It just
moves from 12:00 to 10:00 to go down and 12:00 to 2:00 to go up.
Here's a link to a picture of the radio:
http://tinyurl.com/y8v9vw

So it's like they have on at least some car radios (I have no idea
how common the scheme is). It's the equivalent of an UP and DOWN
button on some radios, but in the form of knob on a shaft.

Michael