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Local Radio Connections
TX Audio Connection
Different jumper settings are required for different revisions of the PCB installed in the IP-223 unit. Set the jumper position for
the line according to the connection type.
• If the radio transmit audio output is balanced, connect to pins 13 and 25 of the DB25 connector.
• If the transmit audio is single ended, use pin 25 of the DB25 connector.
NOTE: Shielded cable is recommended.
PCB 750743 or PCB 750630 Revision C and Higher
Line 1 jumpers: J3, J9, and J11
Line 2 jumpers: J25, J28, and J29
RX Audio Connection
Different jumper settings are required for different revisions of the PCB installed in the IP-223 unit, to connect the radio
receiver audio to the IP-223. Set the jumper position for the line according to the connection type.
• If the radio receiver audio output is balanced, connect to pins 12 and 24 of the DB25 connector.
• If the receiver audio is single ended, use pin 24 of the DB25 connector. The audio source must follow the squelch
circuit to prevent sending continuous noise to the remote console.
• If a high-impedance point in the receiver is used, a shielded cable is recommended.
TABLE 5. PCB 750743 or PCB 750630 Revision C and Higher Jumper Positions
Jumper Position Connection Type
A Single Ended Low-Impedence
B Balanced 600 Ohm
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