Motorola SG4-DRT-2X manual 2X redundant return configuration board

STARLINE7

Figure 7 illustrates the 2X redundant return configuration board. Jumpers J5 and J6 are shown in the normal default position. Jumper J6 enables/disables signal flow to output connector

J8 (Tx2). Jumper J5 terminates input connector J3 (IN2) when only a single RF input is used.

Figure 7

2X redundant return configuration board

J5 J6

J2

	IN2
J3
C6	R3

TX2

J8

J7

TX1

T1

C8

J5	TERM	C17	C14
R8	C13	R6 R5	R14	C19
J6

TERM		R15
	C10
C11
R7

C12

T2

C9

C7

R4

R10

C15 R12 C16

Q1

J9

T3

R2

IN1

		C3
L1	J4	C1	J1
	C18
R1
	R16		C2
		R13 C4	C5
SM		R11

Figure 8 illustrates the signal flow through the 2X redundant return board:

Figure 8

2X redundant return board- signal flow

TX2	IN2
J6-0.5 dB	J5
-3.5 dB	-3.5 dB
+7.5 dB
TX1 SM	IN1

Loss = 0.9 dB

To set up the split return option:

1Confirm that the SG4-DRT-2X is installed in lid optics slots 3 and 4, or 5 and 6.

2Confirm that a 2X redundant return board is installed in lid return configuration board locations 2 and 3 as illustrated in Figure 5.

3Position J6 in the right-most position to terminate the output to transmitter two.

4Connect an RF cable from the 2X redundant return board, in lid return configuration board location 2, to CH B of the SG4-DRT-2X .

5Connect 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.

6If necessary, connect the appropriate return RF cables from the SG4-RF modules to each 2X redundant board.

SG4-DRT-2X Installation Sheet