Motorola BLE100 operation manual Test Equipment and Connections, Measuring Forward Gain

4-2 Bench Testing

Test Equipment and Connections

The equipment typically used for testing the BLE100 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

			BLE100
			under test
		4	2	6
Network	Cable	Power
analyzer	simulator	combiner
		5	1	3
		60/90 Vac

117	AC power
Vac	supply	Sweep	Sweep
		input	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 BLE100.

To measure the full gain of the amplifier:

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

2Connect the BLE100 to the test equipment as illustrated in Figure 4-1 and apply power.

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

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

5Select manual gain by placing the drive control select jumper in the MAN position and turn the MANUAL LEVEL control (Figure 2-8) fully clockwise.

BLE100 Installation and Operation Manual