Motorola SG4-DRT-2X - Manual (Page 7)

STARLINE 7
Figure 7 illustrates the 2X redundant return configuration board. Jumpers J 5 and J 6 are shown
in the normal default position. Jumper J 6 enables/disables signal flow to output connector
J 8 (Tx2). Jumper J 5 terminates input connector J 3 ( IN2 ) when only a single RF input is used.
Figure 7
2X redundant return configuration 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 8 illustrates the signal flow through the 2X redundant return board:
Figure 8
2X redundant return board- 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 return option:
1 Confirm that the SG4-DRT-2X is installed in lid optics slots 3 and 4, or 5 and 6.
2 Confirm that a 2X redundant return board is installed in lid return configuration board
locations 2 and 3 as illustrated in Figure 5.
3 Position J 6 in the right-most position to terminate the output to transmitter two.
4 Connect an RF cable from the 2X redundant return board, in lid return configuration board
location 2, to CH B of the SG4-DRT-2X .
5 Connect an RF cable from the 2X redundant return board, in lid return configuration board
location 3, to CH A of the SG4-DRT-2X.
The RF cables should be approximately eight inches long and have red boots on the
connector signifying the return path.
6 If necessary, connect the appropriate return RF cables from the SG4-RF modules to each 2X
redundant board.
SG4-DRT-2X Installation Sheet