Warranty

ManualsBrandsPowerwave Technologies ManualsElectronicsTornado, Model NTGY71AA

044-05080 Rev. A 5-1

MAINTENANCE

5-1. INTRODUCTION

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

power 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.

Table 5-1. Periodic Maintenance

TASK INTERVAL ACTION

Inspection

Cables and Connectors 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 is listed in Table 5-2. Equivalent test equipment may

be substituted for any item, keeping in mind that a thermistor type power meter is required.

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.

Section

Summary of content (5 pages)

PAGE 1
Section 5 MAINTENANCE 5-1. INTRODUCTION This section contains periodic maintenance and performance test procedures for the multichannel power 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
Table 5-2. Test Equipment Required MENCLATURE Signal Generator 30 dB Attenuator, 250 Watt Spectrum Analyzer Coax Directional Coupler Power Meter / Sensor Network Analyzer Current Probe Source Diskette MANUFACTURER Agilent (H.P.) Tenuline H.P. H.P. H.P. H.P. MODEL ESG4433B 8562E 778D 437B / 8481A 8753D Powerwave 5-4. 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.
PAGE 3
Figure 5-1. NTGY71AA Amplifier Test Setup Diagram 044-05080 Rev.
PAGE 4
Table 5-3. Multichannel Power Amplifier NTGY71AA Test Data Sheet Tested By: ______________________ Serial No: ____________________ Pass/Fail: ______________________ Date: ________________________ 70W MCPA Test Test Conditions: Load and source impedance: 50 ohms, VSWR < 1.2:1 Supply voltage: (+26) Vdc ± 0.1 Vdc (unless otherwise noted). Network Analyzer Span: 25 MHz Marker #1 = 869 MHz, #2 = 881 MHz, #3 = 894 MHz TEST CONDITION MIN MAX 1.00 NETWORK ANALYZER 1.01 Gain 1.02 Gain Flatness 1.
PAGE 5
-5. FIELD REPLACEMENT OF THE MODULE The NTGY71AA multichannel power amplifier module can be replaced in the field on site by a qualified technician with experience maintaining RF power amplifiers and similar equipment. To replace a power amplifier module, proceed as follows: 1. Turn off 26 Vdc power to that specific module. 2. Disconnect the two RF cables and connectors P1 through P5. 3. Remove 13 screws that secure amplifier module to heat sink. 4. Carefully remove amplifier module from heat sink.