Motorola BLE*/* - Manual (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
A S SE M B LE D I N M E X I C O
4 2 6
3 1 5
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.