TN520 SR-39-3 Multiple Receiver Subrack
MT-3/4 Radio Systems
TECHNICAL NOTES
Page 1 of 2
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TN520, REV 3-1-0, © Mar 2013
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The SR-39-3 subrack is designed to hold and interconnect the MT-3 and MT-4 series of receivers on one universal
motherboard. The SR-39-3 subrack holds up to fi ve receiver modules and one system regulator (the system
regulator will require jumpers JU15 to JU24 installed for multiple receiver subrack compatibility) as shown in Figure 1.
The multiple receiver subrack is ideal for voting receivers or with the mutliple transmitter subrack for multi-channel
trunking systems.
Figure 1: Multiple Receiver Subrack
The multiple receiver subrack does not interconnect the diff erent receivers but brings control lines and audio out to
connection points on the rear of the subrack. The external control connectors allow access to the following signals
on each receiver:
Pin No. Name Function
1 RX CSEL 3 Receiver channel select line No. 3
2 RX CSEL 2 Receiver channel select line No. 2
3 RX CSEL 1 Receiver channel select line No. 1
4 RX CSEL 0 Receiver channel select line No. 0
5 RX COR RLY COM1 Receiver Carrier Operated Relay Common 1
6 RX RLY NC1/NO1 Receiver Relay Normally Open / Normally Closed
7 RX COR Receiver Carrier Operated Relay output
8 RX DISC/FL/DE Receiver Disc or Flat or De-emphasis audio output (MT-3)
Receiver Disc or SM-3 Speaker audio output (MT-4E)
9 RX SQL OVER Receiver squelch override input
10 RX SYN LOCK DET (Spare) Receiver Spare I/O
11 RX PRIORITY COR Receiver Priority COR output (MT-3)
Receiver A/D Mode (MT-4E)
12 RX RSSI Receiver Signal Strength Indicator
13 RX BAL O/P 2 Receiver balanced audio output, side 2
14 RX BAL O/P 1 Receiver balanced audio output, side 1
15 RX MUTE Receiver mute input
16 GND Circuit common
SYSTEM
REGULATOR
RECEIVER
E
RECEIVER
D
RECEIVER
C
RECEIVER
B
RECEIVER
A
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