Motorola STARLINE SERIES Instructions d'exploitation télécharger pdf (Page 37)

4-2 Bench Testing

BLE*/* Installation and Operation Manual

Test Equipment and Connections

The equipment typically used for testing the BLE*/* consists of a network analyzer such as the

HP 8712 or 8713 series, a 60/90 Vac bench power supply, a cable simulator, a Motorola model

SSP-PIN power combiner, and a variety of jumper cables, adapters, and fittings.

CAUTION!

To protect the network analyzer and sweep comparator, you must configure the SSP-PIN power combiner to block ac

power from the input port.

Fabricate a cable simulator that you can configure to provide the desired cable loss in 1 dB

increments up to approximately 30 dB. Then, connect the test equipment as shown in

Figure 4-1:

Figure 4-1

Test equipment connections for bench sweeping

Network

analyzer

BLE-*/*

under test

Cable

simulator

Power

combiner

117

Vac

AC power

supply

60/90 Vac

Sweep

input

Sweep

output

CAUTION!

Before you begin the following subsection, remove the input pad,

JXP-IN, to avoid damage to the hybrids before you

apply power.

Measuring Forward Gain

This subsection provides instructions for measuring the full gain and the operational gain and

flatness of the BLE*/*.

To measure the full gain of the amplifier:

1 Determine whether the power-supply jumper (J1) is positioned for LO or HI operation.

2 Connect the BLE*/* to the test equipment as illustrated in Figure 4-1 and apply power.

3 Verify that the dc voltage is 24 V ± 0.4 V and re-install the input pad.

4 Apply the sweep signal and adjust test equipment as needed.

5 Select manual gain by placing the drive control select jumper in the MAN position and turn

the

MANUAL LEVEL control (Figure 2-8) fully clockwise.

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Motorola STARLINE SERIES Instructions d'exploitation Page 37

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