TN856 CI-IP-223 Telex (Vega) IP Network Remote Adapter
MT-3/4 Radio Systems
TECHNICAL NOTES
TN856 Rev 7-0-0 Aug 16Page 4 of 4
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TN856, REV 7-0-0, © Aug 2016
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Bypassing the AC-3E Audio Control Card and CI-BC-4E Base Control Card:
The AC-3E Audio Control Card and CI-BC-4E Base Control Card can be bypassed and the MT-4E Receiver
and Transmitter can be connected directly to the Telex adapter. The control card needs to be removed from the
subrack, or unwanted loading could occur.
The following receiver and transmitter tuning changes would be required:
Transmitter Setup - Apply a 1.0 KHz tone @ 0 dBm (775 mV) to the Tx A Bal I/P1 (J1-1) and Tx A Bal I/P 2 (J1-2)
balanced audio input and adjust the RSS software Balanced Audio Deviation Level for a transmitter deviation of ±
3 KHz (WB), ± 1.5 KHz (NB).
Receiver Setup - Inject a 1.0 KHz tone @ a deviation of ± 3 KHz (WB), ± 1.5 KHz (NB) into the receiver and
adjust the RSS software Balanced Output Audio Level for an audio level of 0 dBm (775 mV @ 600 ohms) across
Rx A Bal O/P 1 (J1-5) and Rx A Bal O/P 2 (J1-6).
The DB25 (J10) can be jumpered for Balanced Audio direct to / from the receiver and transmitter as follows:
WARNING: JU108 must be confi gured correctly for IP-223 or damage can occur.
JU104 A = RX A Bal O/P2 JU107 A = RX A Bal O/P1
JU105 A = TX A Bal I/P2 JU108 B = IP-223 & IP-224 / RX A COR
JU106 A = TX A Bal I/P1
On the Wiring diagram for the A-PNLAUX96-3, the following connections change:
(GPIO 5) AUX 1 AUDIO O/P1(J3-5) Rx A Bal O/P 1 (J1-5)
(GPIO 6) AUX 1 AUDIO O/P2 (J3-6) Rx A Bal O/P 2 (J1-6)
(GPIO 1) AUX 1 AUDIO I/P1 (J3-1) Tx A Bal I/P1 (J1-1)
(GPIO 2) AUX 1 AUDIO I/P2 (J3-2) Tx A Bal I/P 2 (J1-2)
(GPIO 14) AUX 1 PTT K (J3-14) Tx A PTT (J1-3)
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