Telex IP-223 - Manual (Page 25)

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Local/Radio Connections
TX Audio Connection
The IP-223 has a number of options when connecting to the radio. Different jumper settings are required for different
revisions of the PCB installed in the IP-223 unit, and are noted below. Set the jumper position listed for the line according to
the connection type shown below.
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
To connect the radio receiver audio to the IP-223, different jumper settings are required for different revisions of the PCB
installed in the IP-223 unit, and are noted below. Set the jumper position for the line according to the connection type shown
below.
• 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 be after 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.
PCB 750743 or PCB 750630 revision C and higher
Line 1 jumpers: J16 and J21
Line 2 jumpers: J19 and J20
Jumper Position Connection Type
A Single Ended Low-Impedence
B Balanced 600 ohm
Jumper Position Connection Type
A Single Ended Low-Impedence
B Balanced 600 ohm