Philips US2-PH61159 - Manual (Page 6)

3. Turn on the connected video source, the modulator will deliver the
video/audio signal to the TV set and the red light of MOD. ON will be ON.
4. Turn off the connected video source, the modulator will be switched
automatically to deliver the ANT/Cable signal to the TV set and the red
led of MOD. ON will be off.
1. Turn on the TV and set it to either Channel 3 or 4, whichever of the
two is not used for regular broadcasts in your area.
2. Set the RF Modulator’s CHANNEL 3 or 4 switch to the same channel
you set on the TV (3 or 4)
OPERATION
4 3 MOD. ON
CHANNEL