I expect this has been discussed, and I looked for an existing thread and didn’t find one. I feel sure other people have been down this path. On my MFJ-1708B, the antenna connection goes to only the SDR on receive and XCVR on transmit, it doesn’t split the receive signal. I stared at the schematic... yup that’s how it is set up to be. There are spots on the circuit board for jumpers 3 and 4, not used. JP4 would be a straight split, I tried it temporarily and yes it splits. The schematic shows JP 3 with a pair of resistors R11 and R12. My board doesn’t have those resisters but I presume the idea is 9 ohms would send more signal to the SDR, less to the XCVR. So who has experimented with this and what have you decided? Just use JP4 with a simple split? Or use resistors as shown, and what values? My xcvr is IC-7100 and SDR is SDRplay SDRduo.