Motorola SG4-DRT-2X 用户手册

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. 

C15

R1

C9

C10

TERM

TERM

C11
R7

C12

R2

R1

1

C5

C4

R13

R16

R10

R4

C7

C8

C13

C6

R3

R8

R5

R1

2

C18

R1

4

R15

C16

C1

9

C14

C17

R6

C2

C1

C3

J5

J6

 

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

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.