I have built up 2 MSF 5000 and help maintain another. Even with the correct cable, isolation (desense) of the MSF system is not good (about .25 microvolt measured. So far, all of our systems use the stock MSF filters feeding a good duplexer such as the Motorola 4 can pass notch or PD 500 series. I have played with varying the lengths of the arms and main branch. We use RX low and TX high (all 440 systems)
Ralph
