Motorola SG4-DRT-2X - Manual (Page 10)

10 STARLINE
Figure 10 illustrates the plug-in board required for the 2X redundant return option. Jumpers J 5
and J 6 are shown in the correct position. Jumper J 6 enables signal flow to output connector
J 8 (Tx2) when in the left-most position. Jumper J 5 terminates input connector J 3 ( IN 2 ) when only
a single RF input is used.
Figure 10
2X redundant return board
J9
T3
Q1
C15
R1
J4 J1
J2
C9 T1
J5
J6
C10
TERM
TERM
J7
J8
C11
R7
T2
C12
J3
IN1 IN2
TX2
TX1 R2
R1
1
C5 C4 R13
R16
R10
R4
C7 C8
C13
C6
R3
R8 R5
R1
2
C18
R1
4
R15
L1
C16 C1
9
C14
C17
R6 C2
C1
C3
SM
J5 J6
Figure 11 illustrates the signal flow through the 2X redundant return board:
Figure 11
2X redundant return – signal flow
Loss = 0.9 dB
J6
-0.5 dB
-3.5 dB
+7.5 dB
-3.5 dB
TX2
TX1 SM
J5
IN2
IN1
To set up the split redundant return option:
1 Confirm that SG4-DRT-2X transmitters are installed in lid optics slots 3 and 4, and 5 and 6.
2 Confirm that a 2X redundant return board is installed in return configuration locations 2
and 3 as illustrated in Figure 8.
3 Position J 6 in the left-most position on each configuration board to enable the output to Tx2.
4 Connect an RF cable from connector TX1 on the 2X redundant return board in configuration
location 2 to CH B of the transmitter in lid optics slots 3 and 4.
5 Connect a second RF cable from connector TX2 on the 2X redundant return board in
configuration location 2 to CH B of the transmitter in lid optics slots 5 and 6.
6 Connect an RF cable from connector TX1 on the 2X return redundant board in configuration
location 3 to CH A of the transmitter in lid optics slots 3 and 4.
7 Connect a second RF cable from connector TX2 on the 2X return redundant board in
configuration location 3 to CH A of the transmitter in lid optics slots 5 and 6.
SG4-DRT-2X Installation Sheet