I have a Shure Brothers Model 559853 microphone that looks very similar to the Shure 444. I assume this mic was made specifically for RCA since their initials are on the base. I'm trying to connect it to my Ten Tec 580 Delta HF transceiver. It keys the transmitter OK but can't seem to get any audio out of it. Does anyone have a wiring diagram for this mic? There are four leads in the mic cable: White, Black, Green, and Red.