Powerwave Technologies 5JS0042 Linear Feed-Forward Power Amplifier User Manual Part 7

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Document ID	74214
Application ID	t4GYcVoqchP/OVzrhynFnQ==
Document Description	User Manual Part 7
Short Term Confidential	No
Permanent Confidential	No
Supercede	No
Document Type	User Manual
Display Format	Adobe Acrobat PDF - pdf
Filesize	2.51kB (31336 bits)
Date Submitted	1999-12-07 00:00:00
Date Available	2000-04-06 00:00:00
Creation Date	2001-05-09 15:49:43
Producing Software	Acrobat Distiller 4.0 for Windows
Document Lastmod	2001-05-09 15:49:44
Document Title	User Manual Part 7

Section
MAINTENANCE
5-1. INTRODUCTION
This section contains periodic maintenance and performance test procedures for the Multicarrier
Cellular Amplifier System. 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
Cleaning
Air Vents
INTERVAL
30 Days
ACTION
Inspect and clean per para. 5-4.
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 para. 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
equipment may be substituted for any item; keep 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.
044-05055 Rev. A
5-1
Table 5-2. Test Equipment Required
NOMENCLATURE
Signal Generator
30 dB Attenuator, 500 Watt
10 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. If the equipment is operated in a
severe dust environment, they should be cleaned more often as necessary. Turn off DC power
source before removing fans. If dust and dirt are allowed to accumulate, the cooling efficiency
may be diminished. Using either compressed air or a brush with soft bristles, loosen and remove
accumulated dust and dirt from the air inlet panels.
5-5. 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 figure 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.
5-5.1. AMPLIFIER SYSTEM PERFORMANCE TEST.
This test is applicable to the MCR20XX Series (NTL107AC) subrack with two plug-in G3X-800
Series (NTL107AA) amplifier modules. To perform the test, proceed as follows:
1. Connect test equipment to the subrack as shown in figure 5-1.
NOTE
Do not apply any RF signals at this time.
2. Turn on signal generator and set frequency F1 to 880 MHz, F2 to 883 MHz, F3 to 886
MHz, and F4 to 889 MHz. Adjust each signal generator output so that the sum power
output from all four signal generators equals -4 dBm at the output of the 4-way combiner.
044-05055 Rev. A
5-2
Figure 5-1. Amplifier System Test Setup Diagram
SINGLE AMPLIFIER IMD TEST:
3. Adjust attenuator for an input signal at -l0 dBm. Turn on both amplifiers, and set RF ON
switch of amplifier number two to OFF. Reset first amplifier with the front panel RF ON
switch, and set switch to ON. Adjust variable attenuator to set amplifier power output on
power meter to 100 watts. Measure IMD on spectrum analyzer. IMD should be -65 dBc
min. Record test data in table 5-3. Set RF ON switch to OFF.
4. Repeat step 3 for amplifier number two.
TWO AMPLIFIER IMD AND CURRENT TEST:
5. Reset and turn on both amplifier modules. Adjust the variable attenuator to set power
output on power meter to 200 watts. Measure IMD on spectrum analyzer. IMD should be
-65 dBc min. Record test data in table 5-3.
6. With the amplifier modules set at 200 watts power output, use the current probe
(magnetic field type) and measure the dc current flow from the +27 Vdc power source.
Current should be 110 amps maximum. Record test data in table 5-3.
044-05055 Rev. A
5-3
GAIN TEST:
7. Disconnect spectrum analyzer from test setup, and connect the network analyzer.
8. Set network analyzer as follows:
•
Power output to 5 dBm.
•
Frequency start to 869 MHz.
•
Frequency stop to 894 MHz.
•
Normalize the network analyzer for gain and return loss.
9. Reset and turn on the channel 1 amplifier; turn off channel 2 amplifier. Check the gain
across the band from 869 MHz to 894 MHz. Gain should be between 30 and 50 dB.
Record test data in table 5-3.
10. Turn off the channel 1 amplifier and reset and turn on the channel 2 amplifier. Check the
gain across the band from 869 MHz to 894 MHz. Gain should be between 30 and 50 dB.
Record test data in table 5-3.
11. Reset and turn on both amplifier modules and check the gain. The gain of both amplifiers
should be 3 dB higher than in steps 9 and 10. Record test data in table 5-3.
HARMONICS TEST
12. With the power set at 200 watts power output, use the spectrum analyzer and check the
frequency band from 869 MHz to 894 MHz for harmonics. Harmonics should be -45 dBc
maximum. Record test data in table 5-3.
SPURIOUS TEST
13. With the power amplifier set at 200 watts power output, use the spectrum analyzer and
check the frequency band from 869 MHz to 894 MHz for spurious signals. Spurious
signals should be -60 dBc maximum. Record test data in table 5-3.
INPUT RETURN LOSS TEST:
14. Reset and turn on both amplifier modules in the subrack. Read and record the S11 return
loss measurement on network analyzer. Input return loss should be –14 dB minimum.
Record test data in table 5-3.
044-05055 Rev. A
5-4
Table 5-3. Multicarrier Cellular Amplifier System Test Data Sheet
DATE _________________________________
MCR20XX SERIES (NTL107AC) SUBRACK S/N ______________________________________
MODULE #1 S/N ________________________ MODULE #2 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
One Module
4-TONE IMD
Two Modules
RF Gain
One Module
RF Gain
Two Modules
Gain Flatness
Harmonics
Spurious
Input Return
Loss
DC Power
SPECIFICATION
Vcc = 27 Vdc
PO = 100 W
Freq.: 880, 883, 886, and 889
MHz
Vcc = 27 Vdc
PO = 200 W
Freq.: 880, 883, 886, and 889
MHz
Vcc = 27 Vdc
PO = 100 W
Freq. = 880 MHz
Vcc = 27 Vdc
PO = 200 W
Freq. = 880 MHz
Vcc = 27 Vdc ±1 Vdc
PO =200 W
869-894 MHz Band
Vcc = 27 Vdc
PO = 200 W
869-894 MHz Band
Vcc = 27 Vdc
PO =200 W
869-894 MHz Band
Vcc = 27 Vdc
PO = 200 W
869-894 MHz Band
Vcc = 27 Vdc
PO = 200 W
4 Tones
MIN
DATA
-65 dBc
1,2
-65 dBc
30 dB
50 dB
30 dB
50 dB
-0.6 dB
+0.6 dB
1,2
1,2
1,2
-13 dBm
1,2
-60 dBc
1,2
-16 dB
110
Amps
PASS _________________________________
Tested by ______________________________
044-05055 Rev. A
MAX
5-5
1,2
FAIL _______________________________
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. G3X-800 Series (NTL107AA) power amplifier modules
2. Cooling fans
5-6.1. G3X-800 SERIES (NTL107AA) MODULE
To replace a power amplifier module, proceed as follows:
1. Set both the RF ON On/Off/Reset switch and the power ON/OFF switch on the front panel
of the amplifier module to OFF.
2. Loosen two screws that secure amplifier module to subrack.
3. Use handle on front of module, and with a steady even pressure, pull module out of
subrack.
CAUTION
When removing the amplifier from the subrack, it is very
important to support the amplifier such that the rear of the
module does not suddenly drop when it disengages from the
track. A drop such as this could damage the module.
5-6.2. COOLING FANS
To replace a cooling fan, proceed as follows:
1. Remove amplifier module from subrack; see paragraph 5-6.1 preceding.
2. Loosen four snap fasteners that secure fan to amplifier module. Disconnect fan power
connector from amplifier module.
3. Install replacement in reverse order of steps 1 and 2 above.
044-05055 Rev. A
5-6

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