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Definition: RF in

(Radio Frequency in) Refers to coaxial sockets on the back of older TVs, VCRs and DVDs that accepted analog video signals. The "RF in" socket is typically receiving VHF/UHF signals from an antenna. Contrast with RF out. See F connector and RF.

The "IN" jack on this VCR receives VHF/UHF TV from an antenna. The "OUT" jack sends signals converted to TV channel 3 or 4 because very early TVs had only antenna inputs.