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G3S-800-140-031 Installation & Service Manual

044-05095 Rev. A 5-1 September 2001

Section 5 Maintenance

5-1 Introduction

This section contains periodic maintenance and performance test procedures for the Multicarrier

Cellular Amplifier. It also contains a list of test equipment required to perform the identified tasks.

NOTE

Check your sales order and equipment warranty before attempting to service or repair

the unit. Do not break the seals on equipment under warranty or the warranty will be

null and void. Do not return equipment for warranty or repair service until proper

shipping instructions are received from the factory.

5-2 Periodic Maintenance

Periodic maintenance requirements are listed in table 5-1. Table 5-1 also lists the intervals at

which the tasks should be performed.

WARNING

Wear proper eye protection to avoid eye injury when using compressed air.

Table 5-1 Periodic Maintenance

Task Interval Action

Cleaning

Air Vents 30 Days Inspect and clean per paragraph 5-4

Inspection

Cables and Connec-

tors

12 Months Inspect signal and power cables for

frayed insulation. Check RF connectors

to be sure that they are tight.

Performance Tests

12 Months Perform annual test per paragraph 5-5.

5-3 Test Equipment Required For Test

Test equipment required to test the amplifier system is listed in table 5-2. Equivalent test equip-

ment may be substituted for any item, keeping in mind that a thermistor type power meter is re-

quired.

NOTE

All RF test equipment must be calibrated to 0.05 dB resolution. Any deviation from

the nominal attenuation must be accounted for and factored into all output readings.

Summary of content (6 pages)

PAGE 1
G3S-800-140-031 Installation & Service Manual Section 5 Maintenance 5-1 Introduction This section contains periodic maintenance and performance test procedures for the Multicarrier Cellular Amplifier. It also contains a list of test equipment required to perform the identified tasks. NOTE Check your sales order and equipment warranty before attempting to service or repair the unit. Do not break the seals on equipment under warranty or the warranty will be null and void.
PAGE 2
G3S-800-140-031 Installation & Service Manual Table 5-2 Test Equipment Required Nomenclature Signal Generator 30 dB Attenuator, 500 Watt 20 dB Attenuator, 20 Watt (2 each) Spectrum Analyzer Coax Directional Coupler Power Meter/Sensor Network Analyzer Current Probe Manufacturer RDL Weinschel Corp. Tenuline Model IMD-801D-03A 53-30-34 H.P. H.P. H.P. H.P. 8560E 778D 437B/8481A 8753C 5-4 Cleaning Air Inlets/Outlets The air inlets and outlets should be cleaned every 30 days.
PAGE 3
G3S-800-140-031 Installation & Service Manual Unit Under Test +27 Vdc Gnd G3S-800-140-031 Plug-in Amplifier Module RF Out 30 dB Attenuator 20 dB Directionl Coupler 20 dB Attenuator 500 W 20 W Power Meter RF In CoDir uplect er ion l Att en20 uadB tor 20 W Spectrum Analyzer 8651E Sensor Head 8482A Network Analyzer 8753C Filter / Isotlator Signal Generator 10 dB Variable Attenuator Sensor Head 8482A Power Meter Figure 5-1 Amplifier System Test Setup Diagram 5-5.1.
PAGE 4
G3S-800-140-031 Installation & Service Manual 5-5.1.4 Spurious Test 8. With the power amplifier set at 140 watts power output, use the spectrum analyzer and check the frequency band from 851 MHz to 869 MHz for spurious signals. Spurious signals should be -60 dBc maximum. Record test data in table 5-3. 5-5.1.5 Input Return Loss Test 9. Reset and turn on amplifier module. Read and record the S11 return loss measurement on network analyzer. Input return loss should be –16 dB maximum.
PAGE 5
G3S-800-140-031 Installation & Service Manual Table 5-3 Multicarrier Cellular Amplifier Test Data Sheet DATE _________________________________ AMPLIFIER S/N _________________________ TEST CONDITIONS: Load and Source Impedance: 50 Ohms VSWR: < 1.2:1 Supply Voltage: +27 Vdc ±1.0 Vdc TEST 4-TONE IMD RF Gain Gain Flatness Harmonics Spurious Input Return Loss DC Power SPECIFICATION Vcc = 27 Vdc PO = 140 W Freq.: 853, 857, 863, and 866 MHz Vcc = 27 Vdc PO = 140 W Freq.
PAGE 6
G3S-800-140-031 Installation & Service Manual 5-6 Field Replaceable Parts And Modules The following parts and modules can be replaced in the field on site by a qualified technician with experience maintaining RF power amplifiers and similar equipment: 1. G3S-800-140-031 power amplifier modules 2. Cooling fans 5-6.1 G3S-800-140-031 Power Amplifier Module To replace a power amplifier module, proceed as follows: 1.