Telex IP-223 - COR I;O; PTT Connection

Installation and Level Settings
30
PCB 750743 or PCB 750630 Revision C and Higher
Line 1 jumpers: J16 and J21
Line 2 jumpers: J19 and J20
NOTE: When the speaker output is used, the radio volume control affects the audio levels of the IP-223.
COR I/O
The COR (Carrier Operated Relay) I/O (Input/Output) connection indicates audio is being received from the radio. The COR
I/O connection is provided at DIG6, pin 20 of the DB25 connector.
PTT Connection
Connect the radio PTT circuit to the PTT relay contact terminals on the DB25 connector. Usually the common of the relay
contact switch is grounded and the normally open contact connects to the PTT input. An alternative method to ground the
common of the relay internal to the unit is to jumper R377 (line 1) and R381 (line 2) with a piece of wire soldered closed.
TABLE 6. PCB 750743 or PCB 750630 Revision C and Higher Jumper Positions
Jumper Position Connection Type
A Single Ended Low-Impedence
B Balanced 600 Ohm
TABLE 7. RX Impedance Jumper Positions - 2-Wire
Jumper Position
Line 1 Line 2
Receive Input Impedance: J14 J24
8 Ohms (for a speaker input) B B
600 Ohm A A
10k Ohm NULL NULL
TABLE 8. RX Impedance Jumper Positions - 4-Wire
Jumper Position
Line 1 Line 2
Receive Input Impedance: J14 J23 J17 J24
8 Ohms (for a speaker input) B A A B
600 Ohm A B B A
10k Ohm B B B B