Hitachi VT-DX815A Owner's Manual page 20

DSS® BOX WITH DIGITAL INTERFACE HOOKUP – RF HOOKUP
[C]
button on front of the VCR. Pressing the button alternates between RFCH
03 (channel 3) and RFCH 04 (channel 4) in the VCR's display.
Display the channel which is not used by a commercial channel in your
area.
20