DRA-3M-DIN6 or DRA-3M-RJ45 Jumper Settings: JU1 (yellow) A = 1200 - B = 9600 receiver baud rate delivered to the board from the radio. NOTE: JU1 is not present on the RJ45 model. Radio RX Baud Rate is selected at the 16 Pin DIP configuration socket. JU2 (green) A = 1200 - B = 9600 receiver baud rate delivered to Sound Card 1 (SC1 - DIN-6 Jack) JU3 (blue) A = 1200 - B = 9600 receiver baud rate delivered to Sound Card 2 (SC2 - DIN-6 Jack) Both sound cards and the radio can be set to either 1200 or 9600 baud receiver audio. It's recommended to set these (all) to 1200 for HF operation or (all) to 9600 for VHF and UHF operation. If selection is available on the Sound Cards, set the RX Baud jumpers to the same baud rate. In other words - match the baud rate between the Mixer and Sound Card. The RJ45 model is compatible with Tigertronics SignaLink USB Radio Cables and "Plug & Play" Jumper Modules allowing for connection to virtually hundreds of radios with readily available pre-made cables. These are available from an authorized SignaLink Dealer or directly from Tigertronics. www.tigertronics.com SignaLink and SignaLink USB is a Trademark of Tigertronics. No infringement for the reference of SignaLink or SignaLink USB is intended.