Motorola SG4-DRT-2X Instruções de Operação descarregar pdf (Página 56)

3-28 Bench Setup and Operation

SG4000 Installation and Operation Manual

Figure 3-25 illustrates the combined redundant return plug-in board required for combined

redundant return configuration. Jumpers

J3, J6, and J9 are shown in the normal default

position. Jumper

J9 enables/disables the signal flow to output connector J10 (TX2). Jumper J9 is

shown in the lower position to enable the output connector path to TX2. The RF output to TX1 is

connected to a return transmitter in lid optics slot 4. The RF output to TX2 is connected to a

return transmitter in lid optics slot 3.

Figure 3-25

Combined redundant return board

C15

C13

C11

J12

IN2

IN4

IN3

TX1

J11

TX2

J10

IN1

R21

R15

R14 R13

R12

R9R10

C10

Figure 3-26 illustrates the signal flow through the combined redundant return board.:

Figure 3-26

Combined redundant return – signal flow

Loss = 0.9 dB

-0.5 dB

-3.5 dB

+11 dB

-3.5 dB

Tx2

Tx1

In1

In3 In4

In2

To set up the combined redundant return option:

1 Confirm that transmitters are installed in lid optics slots 3 and 4.

2 Confirm that a combined redundant return board is installed in the return configuration

board location 2, as illustrated in Figure 3-24.

3 Position J9 in the lower position to enable the output to TX2.

4 Connect an RF cable from each of the combined redundant return board outputs to both

transmitter inputs.

The RF cable should be approximately five inches long and have red boots on the connector

signifying the return path.

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Motorola SG4-DRT-2X Instruções de Operação Página 56

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