CBS 500
1)  Remove the top cover.
2)  Look at the back of the faceplate circuit board and there is a jumper connector.
(See Pic)
3)  Move this jumper off of the pins that it is on now and put them on the other 2 pins.
4)  Replace the top cover

Once the channel modification has been done press channel 9-19 button and then turn on the radio. After this mod use the number "1" button to select different bands of 40 channels.

(Coverage from 25.165-29.665Mhz)
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