Connecting diagram shows how a SC3 or SC4 removes one channel (3 or 4) from the antenna signal and combines it with a channel 3 or 4 signal from a local source such as a cable box or VCR. Blocks out-of-band signals emitted from pay TV unit. Prevents interference to off-air channel. Reduces overlapping off-air signals from interfering with originated channel.The SC3 and SC4 are high quality six-stage bandpass/bandstop filters with adjustable balancing attenuators enabling the user to combine a locally originated channel 3 or 4 into an existing home RF distribution system containing adjacent channels.
Note that the SC3 and SC4 do not amplify the channel 3/4 signal. Use with multiple TVs will likely require a separate RF amplifier.