Push-to-talk Talk Back

Required Parts And Tools

• Williams Talkback System IR T1
• Williams RX224 Receiver
• Shure MX393 Boundary Mic
• RDL STM-1 Preamp
• F-XLR Tail
• 22/2 audio cable
• B-connectors
• Fish Tape or Glow Rods
• Electrical Tape
• Wire Stripper

Installation Instructions

Connecting to the Camera

1. Once the camera is installed, locate the AUDIO OUT on your camera
2. Strip the jacket of the 22/2 cable revealing the red, black, and bare wires inside.
3. Cut away the bare wire and plastic surround the cable inside. Strip away a small piece of the red and black jackets revealing the bare copper wire.
4. Wire the black and ground to the - and the red to the + of the AUDIO OUT of phoenix connector.

Mounting the Audio

1. Decide where the STM-1 will be located, knowing the MX393 mic will need to reach it.
2. Place the MX393. Plug the mic into the F-XLR tail.
3. The wires of the XLR will wire to the +, -, and ground Input on the STM-1.

   Note: It may be easier to splice a short length of 22/2 to make it easier to wire to the STM-1 terminals.

4. Cut a length of 22/2 from the STM-1 to the camera. Strip the jacket on both ends. Cut away the bare wire and plastic surround the cable inside. Strip away a small piece of the red and black jackets revealing the bare copper wire.
5. Wire the red to the + and black to the ground power terminals on the STM-1.
6. A short piece of 22/2 cable will also be needed (approx. 1 inch).
7. Strip the jacket from the cable and remove all contents keeping only the red cable.
8. On both ends of the red cable, strip off a piece of the jacket. Connect one end of the 1 inch audio cable to the +PWR terminal and connect the other end into the +PHNTM terminal.
9. Run another length of 22/2 cable from the STM-1 to the IR T1. Wire red to +, black to -, and bare to ground terminals on the Lo-Z Output on the STM-1.

   Note: If the customer desires to capture the audio from this talkback mic, another run of 22/2 cable will be needed for connecting to a mixer that eventually feeds the camera audio.

10. Expose the wires on the other end by the IR. Cut a 3.5mm cable open, test for continuity, then splice it with the 22/2 with B-connectors.
11. Cover your the splice with electrical tape.
12. Plug the 3.5 cable into the Line In of the IR T1.
13. Once audio is plugged in, locate the nearest power outlet to power the IR T1.

    Note: You may need to use 18/2 cable to add length to the power cable. Ensure that when splicing in the 18/2 to the power, that the red jacket of the 18/2 is spliced into the cable with the dashed white lines on the power supply.

Testing the System

1. Ensure your IR T1 and RX224 are set to the same channel.
2. Test the talkback unit is working by activating the talkback function within the VALT Software and having a partner to communicate with.