Motorola SG4-DRT-2X Betriebsanleitung PDF herunterladen (Seite 39)

Bench Setup and Operation 3-11

SG4000 Installation and Operation Manual

Verify that the green LED (ON), located on the top panel of the SG4-R/* in lid optics slot 1, is

illuminated to confirm enable status.

14 Using a voltmeter, test the optical input power to the receivers.

Figure 4-2 illustrates the optical power test point on the top panel of the SG4-R/* receiver.

The scaled voltage at this test point is 1.0 V/mW.

15 Measure the RF output level at the primary receiver –20 dB test point using an RF meter.

For 0 dBm (1.0 mW) input, the receiver output level is approximately 26 dBmV per channel

at 870 MHz. Other output levels are presented in Table 4-2.

16 Select a JXP-* pad from Table 2-2 and insert it into the receiver pad facility.

17 Check all –20 dB test points of the SG4-RF modules connected to the forward

redundant-split board.

The SG4-RF modules are located in the four corners of the housing base, as illustrated in

Figure 3-7.

18 Determine how much output (excess or shortage) is present at the port with the lowest level

and insert the necessary pad into the receiver pad facility.

19 If necessary, adjust level variances between SG4-RF modules by placing a pad at the

particular output pad position.

20 Move the jumper on the EPIM board to the SW1 B override position, which turns receiver 1

off. The red fault LED on receiver 1, and the green enable LED on receiver 2, should

illuminate.

21 Repeat Steps 15 through 17 and verify that the node output levels are the same as the

primary receiver. Adjust the secondary receiver output pad only; do not re-adjust any output

padding in the RF modules.

22 Move the jumper on the EPIM board back to the SW1 AUTO position.

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Motorola SG4-DRT-2X Betriebsanleitung Seite 39