Motorola SG 2000 Betriebsanleitung PDF herunterladen (Seite 27)

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6 Bench Setup

AT&T SLW2500 Installation and Operation Manual

Quick Checks - Functional Testing

It is recommended that you perform the procedures presented in the following subsections before

you place the SLW2500 in service.

Forward Path

Figure 3-1 illustrates the location of the forward-path receiver module.

To set up the forward-path receiver:

1 Confirm the receiver configuration required. For a broadcast only receiver configuration use

position A. For broadcast/narrowcast receivers, use optical receiver A and B positions.

2 Test the optical power input level using an optical power meter.

Figure 5-1 illustrates the optical power test point on the top panel of the SG2-LR receiver

module. The scaled voltage present at this test point is 1.0 V/mW. For 0 dBm input, the

receiver output is approximately 25 dBmV for 77 channels. Other output levels are

presented in Table 5-2.

3 Verify that the green ON LED, located on the top panel of the receiver, is illuminated to

confirm enable status.

4 Verify that the green NORM LED, also located on the top panel of the receiver, is illuminated

to confirm that the optical power is within the recommended operating range. See Section 5,

“Operation” for other LED functions.

5 Select a JXP-* pad from Table 3-2. Insert the pad to the left of the receiver at the receiver

pad facility. The test point and pad location for receiver C is located adjacent to the receiver

as illustrated in Figure 3-1.

6 Check all four outputs at the amplifier test points located in the four corners of the RF

chassis cover as illustrated in Figure 3-4. These test points have 20 dB loss. Therefore, for

example, if the output is 51.5 dBmV at 550 MHz, the test point should read 31.5 dBmV.

7 Set the gain reserves using one of the following gain control options. Adjust the selected gain

control option using the procedure presented in the appropriate subsection below.

n Manual control only — there is no compensation for changes in amplifier gain due to

input level or temperature fluctuations.

n Thermal control — the standard thermal control unit (TCU) is installed at the factory

and compensates for gain changes due to temperature fluctuations only.

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Motorola SG 2000 Betriebsanleitung Seite 27