This cable is for Yaesu radios that have an RCA Fixed Level Audio connector on the rear panel. It provides fixed level audio from the radio to the Sound Card Line In for PSK31, SSTV, MFSK, RTTY, Packet, WSJT and other digital modes. The WHITE colored RCA plug is normally used and connects to the TIP of the 1/8" mini plug. The RED RCA Plug (Ring on the 1/8" mini plug) can be disregarded.