User's Manual

Table Of Contents

EX7100 Technical Manual - Module Descriptions

RF Output Power Measurement

Note: Without available RF test equipment, RF Power Amplifier faults can only be

confirmed by substitution of the module.

If an RF signal generator, RF power meter and suitable test load are available, it is

possible to undertake a simple functional test of the RF Power Amplifier module. Refer to

Figure 7.18 below for equipment connection details.

Signal

Generator

-20 to -10dBm

RF Power

Amplifier Module

Under Test

RF Power

Meter (Bird

or similar)

50Ω 10 W

load

RF Input

J101

RF Output

PL102

Figure 7.18: UHF PA Module Test set-up

1. Disconnect the cable attached to “Tx RF out” SMB connector on the Tx PCB, and

reconnect this to the output of the signal generator (set to the desired transmit

frequency at -20 dBm output level).

2. Connect the RF power meter to PL102 (RF output).

3. The RF Power Amplifier should be able to produce a reading on the RF power meter

of approximately 6.5 Watts when the signal level from the signal generator is slowly

increased from –20 to –10dBm.

If this is the case, the RF Power Amplifier is probably functioning correctly.

Confirm that with approximately 6.5 Watts RF output from the PA module, there is a

forward power reading shown on the LCD of the EX7100 terminal.

Refer to Section 4.2.1 for details of the forward power measurement process.

Note: The front panel LCD reading will not be correct as the terminal is calibrated for a

complex waveform).