I am trying to hook up a Symetrix 528E voice processor to my Kenwood Hybrid 830S and was told that the mike input is about 150 ohms to the rigg and the processors output is 600 ohms. Other hams I think use a matching transformer, I guess 4 to 1? Anyone out there have any experience selecting a matching xfmr for the Hybrids? Steve Hearns KA2PTE