User's Manual

044-05117
Table 5-2. Test Equipment Required
Nomenclature
Manufactu
rer
Model
Signal Generator Agilent 8656B
20 dB Attenuator, 250 Watt Bird
20 dB Attenuator, 20 Watt (2 each) Bird Tenuline
Spectrum Analyzer Agilent 8560E
Coax Directional Coupler Agilent 778D
Power Meter / Sensor Agilent 437B / 8481A
Arbitrary Waveform Generator Sony AWG2021
Network Analyzer Agilent 8753C
* Any Equipment substitutions should have equivalent specifications.
5-4 Amplifier Performance Test
Performance testing should be conducted every 12 months to ensure that the amplifier system
meets the operational specifications listed in Table 5-3. Also verify system performance after any
amplifier module is replaced in the field.
The test equipment required to perform the testing is listed in Table 5-2, and the test setup is
shown in Table 5-1.
Note
The frequencies used in this test are typical for an amplifier with a 25 MHz band
from 869 MHz to 894 MHz. Select evenly spaced F1, F2, F3, and F4 frequencies
that cover the instantaneous bandwidth of your system.
To check amplifier performance, proceed as follows:
WARNING
Do not apply any RF signals to the amplifier input until instructed to do
so.
CAUTIO
N
Ensure that the correct amount of attenuation is used between the amplifier RF
connections and the test equipment to prevent overdrive of the amplifier or the
test equipment.
5-4.1 Amplifier Spurious Emissions Test:
1. Connect the test equipment as shown in Figure 5-1.
2. Configure the signal source to produce four frequencies evenly spaced across the
instantaneous bandwidth to be used for the amplifier under test.
3. Adjust the output of the signal source to excite the amplifier to its rated output.
4. Use the spectrum analyzer to measure the spurious emissions performance.
5. Record test data in Table 5-3. Verify that the data are within the specifications shown in
Table 1-2.
6. Reduce the output of the signal source to minimum.
5-2 Installation and Service Manual - G3L-850-135 Multi-Carrier Power Amplifier