Anritsu MT8802A User manual

i
Second Edition
MT8802A
Radio Communication Analyzer
Service Manual
ANRITSU CORPORATION
Document No.: M-W1382BE-2.0
To ensure that this equipment is used safely, im-
portant safety items are explained in the MT8802A
Radio Communication Analyzer Operation Manual.
This manual explains important service items re-
lated service.
Read both the operation manual and this manual,
and keep both with the equipment.

ii
MT8802A Radio Communication Analyzer
Service Manual
1 November 1999 (First Edition)
13 November 2002 (Second Edition)
Copyright © 1999-2002, ANRITSU CORPORATION.
All rights reserved. No part of this manual may be reproduced without the prior written permission of the
publisher.
The contents of this manual may be changed without prior notice.
Printed in Japan

iii
For Safety
For safety, do not open the equipment covers.
If repair is required, contact the sales representative, branch office, or agent at the telephone number
and address given in this document or in the equipment operation manual.
Although not recommended by Anritsu Corporation, if it is really imperative to open the convers for
emergency repair, take great care not to touch any dangerous parts.
Always request repair by a trained engineer who understands the hazards.
Anritsu Corporation will not accept liability for any injuries sustained as a result of opening the equip-
ment covers.

iv
Power Line Fuse Protection
For safety, Anritsu products have either one or two fuses in the AC power lines as
requested by the customer when ordering.
Single fuse: A fuse is inserted in one of the AC power lines.
Double fuse: A fuse is inserted in each of the AC power lines.
Example 1: An example of the single fuse is shown below:
Fuse Holder
F
U
S
E
Example 2: An example of the double fuse is shown below:
Fuse Holders
F
U
S
E
F
U
S
E

I
About This Manual
This is the service manual of the MT8802A Radio Communication Analyzer for
smooth maintenance and service work of the service personnel, and does not supplied
to customers. Only used for service personnel.
Refer to the separate operation manual (an accessory supplied to the equipment) for
handling the instruments.
Our basic policy to the repair is return to the factory system, i.e. the defective instru-
ment should be returned to Anritsu for repair.
However, it may be time consuming and some kinds of repairs can be easily done in the
field.
Therefore, Anritsu allows only those whom Anritsu has authorized to open the instru-
ment and repair it.
As clearly stated in the WARRANTY statement in the separate operation manual, any
unauthorized modification, repair, or attempt to repair will render the warranty void.

II
Table of Contents
For Safety ...................................................... iii
About This Manual........................................ I
Section 1 Specifications.............................. 1-1
Section 2 Block Diagram and Basic
Explanation ................................. 2-1
2.1 Signal Flow ..................................................................... 2-2
2.2 Explanation of Each Block .............................................. 2-3
Section 3 Level Diagram ............................. 3-1
Section 4 Troubleshooting.......................... 4-1
4.1 Detecting Faulty Block .................................................... 4-2
4.2 Adjustment after Unit Replacement ................................ 4-5
Section 5 Total Adjustment......................... 5-1
5.1 Adjustment of Spectrum analyzer ................................... 5-2
5.2 Adjustment of Power meter ............................................ 5-5
5.3 IF Gain Adjustment ......................................................... 5-6
5.4 Confirmation of detection level ....................................... 5-6
5.5 A05 MOD DSP1 .............................................................. 5-7
5.6 A16 AF ............................................................................ 5-8
5.7 A31 CDMA IQ ................................................................. 5-12
5.8 MT8802A Software Operation Instructions ..................... 5-13

III
Section 6 Correction Software.................... 6-1
6.1 Outline ............................................................................ 6-2
6.2 System configuration ...................................................... 6-2
6.3 Development Environment ............................................. 6-2
6.4 Program setup ................................................................ 6-2
6.5 Software Summary ......................................................... 6-3
6.6 Operation ........................................................................ 6-6
6.7 Program Operations ....................................................... 6-33
6.8 Error Codes List .............................................................. 6-45
Section 7 Inspection Software .................... 7-1
7.1 Outline ............................................................................ 7-2
7.2 System Configuration ..................................................... 7-2
7.3 Development Environment ............................................. 7-3
7.4 Program Setup ................................................................ 7-3
7.5 Outline of Displayed Screen ........................................... 7-4
7.6 Operation Procedure ...................................................... 7-24
Section 8 Check of Call Processing
Function ...................................... 8-1
8.1 Outline ............................................................................ 8-2
8.2 Instrument to be required ................................................ 8-2
8.3 Check Procedure ............................................................ 8-2
Section 9 Mechanical Configuration .......... 9-1
Section 10 Exchange Module List .............. 10-1

IV..
..
.

1-1
Section 1 Specifications
This manual does not cover performance and function specifications of the MT8802A
and options. For details, refer to the separate operation manuals.

Section 1 Specifications
1-2..
..
.

2-1
Section 2 Block Diagram and Basic Explanation
2.1 Signal Flow ............................................................... 2-2
2.2 Explanation of Each Block ........................................ 2-3

Section 2 Block Diagram and Basic Explanation
2-2
Fig. 2-1 shows the general block diagram.
2.1 Signal Flow
• MAIN Input route
An RF signal input to the MAIN connector is branched by the Power Divider. It is
then attenuated by 15 dB and supplied to the A09 RF INTERFACE (RF I/F).
The RF signal input to the A09 RF/IF, is split to the following 3 routes.
One is to the Power Sensor, another one is to the A/D CONVERTER, and the rest is
to the A32 Demod RF.
The RF signal to A32 Demod RF, passes through the Mixer, the Demodulator, and
the A/D Converter; and then is converted to the digital IQ signal. This digital IQ
signal data is analyzed by the A30 CDMA BASEBAND.
The Power Sensor outputs the voltage in proportion to the input power, amplifies it
by the A12 IF circuit, and sends the amplified voltage to the A01 MAIN CPU.
An input signal (sent from the A09 RF/IF to the A10 CONVERTER) is output to the
A12 IF via the 1st and 2nd Mixers. Upon receipt of the input signal, the A12 IF
converts its frequency to 3rd IF, and analog-to-digital(A/D) converts the waveform
to analyze it by the A04 DEMOD DSP.
• MAIN Output route (TDMA system)
Modulation data generated by the A30 CDMA BASEBAND is converted to the I/Q
signal by the A31 CDMA IQ, and is sent to the A13 SG1. The A13 SG1 converts the
frequency of the IF signal (modulated to I/Q) by the 1st, 2nd, and 3rd Mixers, then
outputs it to the A09 RF/IF.
The RF signal output from the A09 RF/IF, is attenuated by 20 dB at the Power Di-
vider, and then is output to the MAIN connector.
• AUX Input route
An input signal is input to the A09 RF/IF without being attenuated by 20 dB.
• AUX Output route
Since this output signal is output from the A09 RF/IF, its output level is higher than
that of the MAIN Output route by 20 dB.

2-3
2.2 Explanation of Each Block
2.2 Explanation of Each Block
•A01 MAIN CPU
Controls each unit and also transfers data to/from the A02 BASEBAND1, A03
BASEBAND2, A04 DEMOD DSP, and A05 MOD DSP.
•A02 BASEBAND1, A03 BASEBAND2
Generates modulation data and timing signals (e.g., symbol clock, burst gate, and
frame trigger).
•A04 DEMOD DSP
Orthogonal-demodulates the A/D-converted data (32 Ms/s), performs filtering, and
analyzes the filtered data. The DSP clock is supplied from the A12 IF.
•A05 MOD DSP
Converts modulation data to an I/Q signal; also converts the I/Q signal to burst data
through the burst gate; and performs calculation to generate an audio signal.
•A07 PANEL CONTROL
Controls the power-on/off; generates input key codes; and controls the LED indica-
tor lamps. This circuit also functions as signal routes of the DUT Interface connector
on the front panel.
•A09 RF INTERFACE
Switches the MAIN and AUX signal routes. The MAIN route has functions of TX/
RX synthesizing and dividing. This also has a power sensor to output a square wave
with an amplitude corresponding to the RF level.
•A10 CONVERTER
Provides the 1st LO (YTO) and 2nd LO (4 GHz), and frequency-converts a input
signal to the 2nd IF (106.8 MHz).
1st LO frequency = RF freq. + 4106.8 MHz (in Tester mode)
1st LO frequency = RF freq. + 4106.75 MHz (in Spectrum Analyzer mode)
In the spectrum analyzer mode, this sweeps YTO frequency.
Sets the Z1 RF ATT to set the A10 input level less than –10 dBm.
The total gain is 14 dB.
•A11 LOCAL
Consists of low-order digits and 1-MHz digit synthesizers. Frequency sweep of span
1 MHz or less is swept by the low-order digits synthesizer.

Section 2 Block Diagram and Basic Explanation
2-4
•A12 IF
Beats down the 2nd IF signal to the 3rd IF (6.8 MHz), and then A/D converts it. The
A/D conversion sample rate is 32 MHz. The clock signal is also supplied to the A04
DEMOD DSP. This also has a saw-tooth wave generator, trigger sweeper, and gate
sweeper to sweep frequencies. It amplifies and rectifies the power sensor output, and
sends it to the A01 MAIN CPU.
•A13 SG
Frequency-converts the 1st IF signal (106.8 MHz) orthogonal-modulated (for digital
system) or FM-modulated (for analog system) to the output frequency by the 2nd LO
(4 GHz) and 3rd LO (YTO).
When the A131 SG LOCAL is not mounted, the 3rd LO is supplied from the A10
CONVERTER.
3rd LO frequency = RF freq. + 4106.8 MHz
•A131 SG LOCAL (option)
Generates the 3rd LO (local) of the A13 SG1. By this function, TX/RX frequencies
can be set independently.
The LO signal output level is -10 dBm or more.
•A15 REFERENCE
Distributes reference signals(100 MHz and 10 MHz) synchronized with the internal crystal
oscillator (10 MHz) or external reference signal (10 MHz or 13 MHz) to each block.
•A16 AF (option)
Generates the audio signals, and outputs them to the A13 SG1 or external devices.
This also performs level adjustment and A/D conversion for external audio signal to
be output to the A04 DEMOD DSP.
•A19 FREQ CONT
Controls TX/RX frequencies in call processing mode while synchronizing with a slot
timing.
•A30 CDMA BASEBAND
A30 CDMA MASEBAND has a ASIC with the modulation/demodulation function
equivalent to that of the base station, and the ASIC control processor to perform the
call processing with the CDMA mobile station.
•A31 CDMA IQ
Executes the phase-equalizing processing, the AWGN (Additive White Gaussian
Noise) signal addition processing, and the digital/analog conversion processing for
the digital IQ signal supplied from the A30 CDMA BASEBAND.
•A32 Demod RF
Receives the RF modulated signal from the CDMA mobile station. Then, Converts it
to the digital IQ signal.

2-5
Section 2 Block Diagram and Basic Explanation
Fig. 2-1

2-6
Section 2 Block Diagram and Basic Explanation
Fig. 2-2

2-7
Section 2 Block Diagram and Basic Explanation
Fig. 2-3

2-8
Section 2 Block Diagram and Basic Explanation
Fig. 2-4
..
..
.

3-1
Section 3 Level Diagram
Fig. 3-1 to 3-4 show the RX/TX-route level diagrams in addition to the variable attenu-
ator set values.

Section 3 Level Diagram
3-2
ATT
–40dBm
–50dBm
–30dBm
–20dBm
–10dBm
0dBm
+10dBm
MOD ATT ATT
ATT ATT
ATT
I/Q
from A05
MOD DSP
or
A31
CDMA IQ Output Frequency4106.8MHz
47Ω
106.8MHz from YTO4GHz
106.8MHz
to A09
RF I/F
TDMA, Analog
CDMA
CDMA
AWGN On
(BS Output
Level)
CDMA
Open Loop
Power Control
–20dB
0 to 140dB
/1dB
ATT ATT ATT
Fig. 3-1 Level diagram in TX system (SG)