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Tektronix WCA230A Service Manual
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Tektronix WCA230A Service Manual

Tektronix WCA230A Service Manual

Portable wireless communication analyzer
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Service Manual
WCA230A & WCA280A
Portable Wireless Communication Analyzers
071-1257-01
This document applies to firmware version 2.4
and above.
Warning
The servicing instructions are for use by qualified
personnel only. To avoid personal injury, do not
perform any servicing unless you are qualified to
do so. Refer to all safety summaries prior to
performing service.
www.tektronix.com
www.valuetronics.com

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Summary of Contents for Tektronix WCA230A

  • Page 1 Service Manual WCA230A & WCA280A Portable Wireless Communication Analyzers 071-1257-01 This document applies to firmware version 2.4 and above. Warning The servicing instructions are for use by qualified personnel only. To avoid personal injury, do not perform any servicing unless you are qualified to do so.

  • Page 2: Contacting Tektronix

    Copyright © Tektronix, Inc. All rights reserved. Licensed software products are owned by Tektronix or its suppliers and are protected by United States copyright laws and international treaty provisions. Use, duplication, or disclosure by the Government is subject to restrictions as set forth in subparagraph (c)(1)(ii) of the Rights in Technical Data and Computer Software clause at DFARS 252.227-7013, or subparagraphs (c)(1) and (2) of the...

  • Page 3: Warranty

    Tektronix, with shipping charges prepaid. Tektronix shall pay for the return of the product to Customer if the shipment is to a location within the country in which the Tektronix service center is located.
  • Page 4 www.valuetronics.com...

  • Page 5: Table Of Contents

    ............1–2 Difference between WCA230A and WCA280A ......
  • Page 6 ........5–20 WCA230A & WCA280A Service Manual www.valuetronics.com...
  • Page 7 ........10–3 WCA230A & WCA280A Service Manual www.valuetronics.com...
  • Page 8 Figure 2–27: Spectrogram view ....... 2–36 WCA230A & WCA280A Service Manual www.valuetronics.com...
  • Page 9 ........5–13 WCA230A & WCA280A Service Manual www.valuetronics.com...
  • Page 10 ......6–49 Figure 6–24: RF1 modules removal – 2 (WCA230A) ....

  • Page 11: Figure 1-6: Block Diagram

    Figure 6–35: Top view for cable interconnection ....6–75 Figure 6–36: Bottom view for cable interconnection (WCA230A) . . . 6–76 Figure 6–37: Bottom view for cable interconnection (WCA280A) .
  • Page 12 ..6–3 Table 6–2: External inspection check list ..... . . 6–5 viii WCA230A & WCA280A Service Manual www.valuetronics.com...

  • Page 13: Table 2-2: Power Cord Identification

    Table 7–4: Optional accessories ....... 7–4 WCA230A & WCA280A Service Manual www.valuetronics.com...
  • Page 14 Table of Contents WCA230A & WCA280A Service Manual www.valuetronics.com...

  • Page 15: General Safety Summary

    WARNING. Warning statements identify conditions or practices that could result in injury or loss of life. CAUTION. Caution statements identify conditions or practices that could result in damage to this product or other property. WCA230A & WCA280A Service Manual www.valuetronics.com...
  • Page 16 WARNING indicates an injury hazard not immediately accessible as you read the marking. CAUTION indicates a hazard to property including the product. Symbols on the Product. The following symbols may appear on the product: WARNING Protective Ground CAUTION High Voltage (Earth) Terminal Refer to Manual WCA230A & WCA280A Service Manual www.valuetronics.com...

  • Page 17: Service Safety Summary

    Use Care When Servicing With Power On. Dangerous voltages or currents may exist in this product. Disconnect power, remove battery (if applicable), and disconnect test leads before removing protective panels, soldering, or replacing components. To avoid electric shock, do not touch exposed connections. xiii WCA230A & WCA280A Service Manual www.valuetronics.com...
  • Page 18 Service Safety Summary WCA230A & WCA280A Service Manual www.valuetronics.com...

  • Page 19: Preface

    Preface This is the service manual for the WCA230A and WCA280A Portable Wireless Communication Analyzers. The manual contains information needed to service the analyzer to the module level. Manual Structure This manual is divided into sections, such as Specifications and Theory of Operation.

  • Page 20: Manual Conventions

    Finding Other Information Other documentation for the WCA230A and WCA280A analyzers includes: H The WCA230A and WCA280A User Manual contains a tutorial to quickly describe how to operate the analyzer. It also includes an in-depth discussion on how to more completely use the analyzer features.

  • Page 21: Introduction

    Introduction This manual contains information needed to properly service the WCA230A and WCA280A Portable Wireless Communication Analyzers as well as general information critical to safe and effective servicing. To prevent personal injury or damage to the analyzer, consider the following...
  • Page 22 Introduction xviii WCA230A & WCA280A Service Manual www.valuetronics.com...

  • Page 23: Specifications

    Specifications www.valuetronics.com...
  • Page 24 www.valuetronics.com...

  • Page 25: Product Overview

    2.5 seconds is standard, ensuring even accurate collection and analysis of super frame signals defined in the 3GPP standard. Features H DC to 3 GHz (WCA230A) / 8 GHz (WCA280A) measurement frequency range H 100 Hz to 3 GHz measurement span and 15 MHz vector span...

  • Page 26: Application

    H cdma2000 1x H cdma2000 1xEV–DO H TD-SCDMA Difference between WCA230A and WCA280A The WCA230A and the WCA280A have the same functions except for their measurement frequency ranges: WCA230A ..DC to 3 GHz WCA280A .

  • Page 27: Real-Time Analysis

    NOTE. An intermittent signal, such as a burst phenomenon, will not be detected unless it is present at the exact moment that the filter is being swept past it. Sweep start stop Figure 1-2: Sweep of resolution filter WCA230A & WCA280A Service Manual www.valuetronics.com...

  • Page 28: Figure 1-3: Concept Of The Real-Time Spectrum Analyzer

    Detector 2 filter 2 RF input Display Resolution Detector 3 filter 3 Resolution Detector N filter N Figure 1-3: Concept of the real time spectrum analyzer Concurrent acquisition start stop Figure 1-4: Concurrent acquisition WCA230A & WCA280A Service Manual www.valuetronics.com...

  • Page 29: Figure 1-5: Frame Acquisition

    The WCA230A and the WCA280A are equipped with a 51.2 MHz A/D converter to analyze the spectrum by single scanning for spans up to 15 MHz.

  • Page 30: Architecture

    Extended trigger (optional) Data memory Memory controller 64 MB (standard) 256 MB (optional) Local bus PCI bridge Windows Display Front panel key board PC Mass Storage Devices External interface GPIB Figure 1-6: Block diagram WCA230A & WCA280A Service Manual www.valuetronics.com...

  • Page 31: Down Converter

    Converts the RF signal, input through the front-panel INPUT connector, into a Down Converter 20 MHz IF signal. This converter processes signals up to 3 GHz for WCA230A and 8 GHz for WCA280A by IF conversions in three stages. A 10 MHz oscillator provides a high-accuracy reference for all stages of IF conversion.
  • Page 32 8.4 inch XGA TFT-LCD module. The standard analyzer has the following external interfaces: H USB (for mouse, keyboard, and/or printer) H LAN (Ethernet 10/100BASE-T) H GPIB H VGA (for an external monitor) WCA230A & WCA280A Service Manual www.valuetronics.com...

  • Page 33: Specifications

    Specifications This section contains the WCA230A and WCA280A Portable Wireless Communication Analyzers specifications. All specifications are guaranteed unless labeled Typical. Typical specifications are provided for your convenience. NOTE. In these tables, those warranted characteristics that are checked in the Performance Verification appear with the n symbol in the Characteristics column.

  • Page 34: Electrical Characteristics

    Carrier offset = 10 kHz, Span = 100 kHz -100 dBc/Hz Carrier offset = 100 kHz, Span = 1 MHz -105 dBc/Hz Carrier offset = 1 MHz, Span = 5 MHz -125 dBc/Hz 1-10 WCA230A & WCA280A Service Manual www.valuetronics.com...

  • Page 35: Table 1-3: Noise Sideband

    Frequency = 2000 MHz -99 dBc/Hz 1 kHz -107 dBc/Hz 10 kHz -108 dBc/Hz 20 kHz -108 dBc/Hz 30 kHz -115 dBc/Hz 100 kHz -135 dBc/Hz 1 MHz -138 dBc/Hz 5 MHz -138 dBc/Hz 7 MHz 1-11 WCA230A & WCA280A Service Manual www.valuetronics.com...

  • Page 36: Table 1-4: Input

    -50 to +30 dBm (1 dB step, RF2/RF3, WCA280A only) -10 to +20 dBm (10 dB step, Option 03 IQ input) Accuracy (-10 to -50 dBm) ±0.2 dB (at 50 MHz, 10 dB attenuation, 20 to 30 _C) 1-12 WCA230A & WCA280A Service Manual www.valuetronics.com...

  • Page 37: Table 1-6: Dynamic Range

    -151 dBm/Hz (100 MHz to 1 GHz) -150 dBm/Hz (1 GHz to 2 GHz) -150 dBm/Hz (2 GHz to 3 GHz) -142 dBm/Hz (3 GHz to 5 GHz, WCA280A only) -142 dBm/Hz (5 GHz to 8 GHz, WCA280A only) 1-13 WCA230A & WCA280A Service Manual www.valuetronics.com...

  • Page 38: Table 1-7: Spurious Response

    -73 dBc (Signal frequency = 2 GHz, Signal level = -5 dBm) RF2, 5 GHz (WCA280A) -70 dBc (Signal frequency = 5 GHz, Signal level = -5 dBm) RF3, 7 GHz (WCA280A) -70 dBc (Signal frequency = 7 GHz, Signal level = -5 dBm) 1-14 WCA230A & WCA280A Service Manual www.valuetronics.com...

  • Page 39: Table 1-8: Acquisition

    10 kHz span 16 ksps 5 kHz span 8 ksps 2 kHz span 3.2 ksps 1 kHz span 1.6 ksps 500 Hz span 800 sps 200 Hz span 320 sps 100 Hz span 160 sps 1-15 WCA230A & WCA280A Service Manual www.valuetronics.com...

  • Page 40: Table 1-10: Frame Time

    GMSK, GFSK, ASK and FSK Measurement filter Root cosine Reference filter Cosine, Gauss Filter parameter a/BT: 0.0001 to 1, 0.0001 step Maximum symbol rate 12.8 Msps Standard setup PDC, PHS, NADC, TETRA, GSM, CDPD, and Bluetooth 1-16 WCA230A & WCA280A Service Manual www.valuetronics.com...
  • Page 41 Center frequency = 3 GHz 0.7% 100 kHz 0.7% 1 MHz 1.5% 4 MHz 2.9% 10 MHz Center frequency = 5 GHz 0.7% 100 kHz (WCA280A only) 0.7% 1 MHz 1.5% 4 MHz 3.0% 10 MHz 1-17 WCA230A & WCA280A Service Manual www.valuetronics.com...

  • Page 42: Table 1-12: Analog Demodulation

    Accuracy (Typical) AM demodulation ±2% (-10 dBfs input at center, 10 to 60% modulation depth) PM demodulation ±3° (-10 dBfs input at center) FM demodulation ±1% of span (-10 dBfs input at center) 1-18 WCA230A & WCA280A Service Manual www.valuetronics.com...

  • Page 43: Table 1-13: Rbw (Resolution Bandwidth)

    10 kHz span 10 Hz 5 kHz span 5 Hz 2 kHz span 2 Hz 1 kHz span 1 Hz 500 Hz span 1 Hz 200 Hz span 1 Hz 100 Hz span 1 Hz 1-19 WCA230A & WCA280A Service Manual www.valuetronics.com...

  • Page 44: Table 1-14: Trigger

    Pulse measurement Pulse width, Pulse peak power, On/Off ratio, Pulse ripple, Pulse repetition interval, Duty cycle, Pulse Pulse phase, Channel power, OBW, EBW, Frequency deviation Pulse length Minimum 20 samples; Maximum 260,000 samples 1-20 WCA230A & WCA280A Service Manual www.valuetronics.com...

  • Page 45: Table 1-16: Display

    Characteristics Description Controller Intel Pentium III 850 MHz DRAM 256 Mbyte DIMM Windows XP System bus PCI, ISA Storage medium Hard disk ≥20 Gbyte 2.5 inch IDE Floppy disk 1.44 Mbyte 3.5 inch 1-21 WCA230A & WCA280A Service Manual www.valuetronics.com...

  • Page 46: Table 1-19: Power Requirements

    Table 1-20: Power connector Characteristics Description Preamp power connector Connector type LEMO 6 poles Pin assignment Pin 1: NC, Pin 2: ID1, Pin 3: ID2, Pin 4: -12 V, Pin 5: GND, Pin 6: +12 V 1-22 WCA230A & WCA280A Service Manual www.valuetronics.com...

  • Page 47: Physical Characteristics

    (20 G), half sine, 11 ms duration Three shocks in each direction along each major axis, total of 18 shocks Cooling clearance Bottom 20 mm (0.79 in) Both sides 50 mm (1.97 in) Rear 50 mm (1.97 in) 1-23 WCA230A & WCA280A Service Manual www.valuetronics.com...

  • Page 48: Table 1-23: Certifications And Compliances

    IEC61010 1 Safety requirements for electrical equipment for measurement, control, and laboratory use. Emissions which exceed the levels required by this standard may occur when this equipment is connected to a test object. 1-24 WCA230A & WCA280A Service Manual www.valuetronics.com...
  • Page 49 Operating Temperature Range +5 to +40 _C Overvoltage Category Overvoltage Category II (as defined in IEC61010 1, Annex J) Pollution Degree Pollution Degree 2 (as defined in IEC61010 1). Note: Rated for indoor use only. 1-25 WCA230A & WCA280A Service Manual www.valuetronics.com...
  • Page 50 Specifications 1-26 WCA230A & WCA280A Service Manual www.valuetronics.com...

  • Page 51: Operating Information

    Operating Information www.valuetronics.com...
  • Page 52 www.valuetronics.com...

  • Page 53: Installation

    Table 2–2, Power Cord Identification. Table 2-1: Power cord conductor identification Conductor Color Alternate color Ungrounded (Line) Brown Black Grounded (Neutral) Light Blue White Grounded (Earthing) Green/Yellow Green WCA230A & WCA280A Service Manual www.valuetronics.com...

  • Page 54: Operating Voltage

    Operating Voltage This analyzer operates with any line voltage from 90–250 VAC with any line frequency from 47–63 Hz. Before plugging the cord in the outlet, be sure that the power supply voltage is proper. WCA230A & WCA280A Service Manual www.valuetronics.com...

  • Page 55: Operating Environment

    5 cm clearance on both sides of and behind the analyzer. The feet on the bottom of the analyzer provide the required clearance when set on flat surfaces. The top of the analyzer does not require ventilation clearance. WCA230A & WCA280A Service Manual www.valuetronics.com...

  • Page 56: Applying Power

    1. Plug the power cord into the AC input on the rear panel. Cord AC input Figure 2-1: AC Input (rear panel) 2. Connect the plug of the power cord to a properly grounded outlet. WCA230A & WCA280A Service Manual www.valuetronics.com...

  • Page 57: Figure 2-2: Principal Power Switch (Rear Panel)

    When you turn on the analyzer, Windows XP boots up. After several minutes, the analyzer application starts up. The initial screen appears as shown in Figure 2–4. The displayed spectrum represents the noise floor of the analyzer. WCA230A & WCA280A Service Manual www.valuetronics.com...

  • Page 58: Figure 2-4: Initial Screen

    RF INPUT connector. If you exceed this input rating, you can permanently damage the analyzer. (The RF INPUT connector is shown in Figure 2–5.) RF INPUT connector Max +30 dBm AC + DC Figure 2-5: RF INPUT connector WCA230A & WCA280A Service Manual www.valuetronics.com...

  • Page 59: Powering Off The Analyzer

    Turning off the principal power switch turns off the front-panel LED. When you do not use the analyzer for a long time or in case of emergency, you should unplug the power cord. WCA230A & WCA280A Service Manual www.valuetronics.com...

  • Page 60: Restart

    (dots that never turn on) or stuck pixels (dots that always stay on). This is neither a malfunction nor a defect, and not a cause for repair or exchange. WCA230A & WCA280A Service Manual www.valuetronics.com...

  • Page 61: Setting Up The Stand

    To set up the stand, place the analyzer on a table. Lift the front of the analyzer and pull out the stand until it is perpendicular to the analyzer. Stand Figure 2-6: Setting up the stand WCA230A & WCA280A Service Manual www.valuetronics.com...

  • Page 62: Repackaging Instructions

    170 kg (375 lb.) test strength. 2. If you are shipping the instrument to a Tektronix field office for repair, attach a tag to the instrument showing the instrument owner and address, the name of the person to contact about the instrument, the instrument type, and the serial number.

  • Page 63: Operating Instructions

    H Spectrum analysis H Digital modulation analysis H Using Windows XP H Shutting off the power You must complete the installation procedures (starting on page 2–1) before performing any of the following steps. 2-11 WCA230A & WCA280A Service Manual www.valuetronics.com...

  • Page 64: Preparations

    Center frequency ... 800 MHz Output level ....–10 dBm 2-12 WCA230A & WCA280A Service Manual www.valuetronics.com...

  • Page 65: Figure 2-8: Principal Power Switch (Rear Panel)

    Principal power switch Figure 2-8: Principal power switch (rear panel) 3. Turn on the power switch (ON/STANDBY) on the front panel, as shown in Figure 2–9. Power switch Figure 2-9: Power switch (ON/STANDBY) 2-13 WCA230A & WCA280A Service Manual www.valuetronics.com...

  • Page 66: Figure 2-10: Initial Screen

    Operating Instructions The initial screen shown in Figure 2–10 appears after Windows XP starts up (the background color is in white on this manual to make figures more viewable). Figure 2-10: Initial screen 2-14 WCA230A & WCA280A Service Manual www.valuetronics.com...
  • Page 67 This tutorial starts with the factory default settings. Perform the following steps to restore the factory default settings: 1. Press the SYSTEM key. SYSTEM key 2. Press the Reset All to Factory Defaults side key. The instrument is now ready to take measurements. 2-15 WCA230A & WCA280A Service Manual www.valuetronics.com...

  • Page 68: Displaying Spectrum

    This section describes how to set the frequency, span, and amplitude first, and then appropriately display the spectrum. Figure 2–11 shows the settings. Frequency (Center frequency) Amplitude Span Figure 2-11: Frequency, span, and amplitude settings 2-16 WCA230A & WCA280A Service Manual www.valuetronics.com...

  • Page 69: Figure 2-12: Menu Items For Numeric Value Input

    If you enter incorrect values, clear them using the BKSP (back space) key and then enter the correct digit. 2-17 WCA230A & WCA280A Service Manual www.valuetronics.com...

  • Page 70: Figure 2-13: Numeric Value Entry Keypad

    (“Center Freq (MHz): 800” in this example). The current setting is displayed in this field. Figure 2-14: Center frequency of 800 MHz, span of 15 MHz 2-18 WCA230A & WCA280A Service Manual www.valuetronics.com...
  • Page 71 4. Turn the general purpose knob to the left to select 100k. The hardware is set with the selected value immediately. The spectrum waveform is displayed on the screen as shown in Figure 2–15. 2-19 WCA230A & WCA280A Service Manual www.valuetronics.com...

  • Page 72: Figure 2-15: Center Frequency Of 800 Mhz, Span Of 100 Khz

    Operating Instructions Figure 2-15: Center frequency of 800 MHz, span of 100 kHz 2-20 WCA230A & WCA280A Service Manual www.valuetronics.com...

  • Page 73: Figure 2-16: Setting Amplitude

    0 dBm when the analyzer is powered on. Observe the change in the waveform as you change this setting in the following procedure: 0 dBm Ref Level setting 10 dB -100 dBm Figure 2-16: Setting amplitude 1. Press the Amplitude key on the front panel. AMPLITUDE key 2-21 WCA230A & WCA280A Service Manual www.valuetronics.com...

  • Page 74: Figure 2-17: Menu Items For Numeric Value Input

    0 dBm or higher, a blue standard line is displayed indicating 0 dBm. 3. Set the Ref Level back to 0 dBm after confirming the amplitude operation. 0 dBm reference line Figure 2-18: Reference level of 10 dBm 2-22 WCA230A & WCA280A Service Manual www.valuetronics.com...

  • Page 75: Figure 2-19: Status Indicator

    By default, the analyzer is now acquiring data in the continuous mode. 1. Press the RUN/STOP key to stop data acquisition. When acquisition stops, “PAUSE” is shown in the status indicator on screen (see Figure 2–19). Status indicator Figure 2-19: Status indicator 2-23 WCA230A & WCA280A Service Manual www.valuetronics.com...
  • Page 76 3. Press the Repeat... side key again and select Continuous to return to the continuous mode. When acquisition starts, “READY” is displayed in the status indicator, indicating that the analyzer is ready for trigger. 2-24 WCA230A & WCA280A Service Manual www.valuetronics.com...

  • Page 77: Using Markers And Peak Search

    The marker (V) appears at the left end of the waveform. 3. The Marker X Position menu item is selected by default. Turn the general purpose knob to move the marker to a measurement point (see Figure 2–20). 2-25 WCA230A & WCA280A Service Manual www.valuetronics.com...

  • Page 78: Figure 2-20: Measurement With A Single Marker

    Operating Instructions Marker X Position Marker 1 Sets the horizontal position of the Marker readout marker using the general purpose knob or numeric input keypad. Figure 2-20: Measurement with a single marker 2-26 WCA230A & WCA280A Service Manual www.valuetronics.com...
  • Page 79 5. Press the Select Marker side key to select 2, making Marker 2 the active marker. You can also select the marker using the MARKERS SELECT key on the front panel. The MARKERS: SELECT key and the Select Marker side key have the same function. 2-27 WCA230A & WCA280A Service Manual www.valuetronics.com...

  • Page 80: Figure 2-21: Measurement With The Delta Marker

    Here selects Delta to show Marker 1 and 2. Marker 2 Figure 2-21: Measurement with the delta marker 7. Press the Markers side key to select Single. The analyzer returns to the single marker mode. 2-28 WCA230A & WCA280A Service Manual www.valuetronics.com...
  • Page 81 5. Press the marker left key (A) to move the marker to the next signal peak to the left. Try it several times. 6. Using the marker left or right key, position the marker to the measurement peak. 2-29 WCA230A & WCA280A Service Manual www.valuetronics.com...

  • Page 82: Figure 2-22: Searching For The Peak

    (see Figure 2–22). Peak value at the selected marker Peak difference Marker 1 Marker 2 Figure 2-22: Searching for the peak 7. Press the Markers side key to select Off. Both markers disappear. 2-30 WCA230A & WCA280A Service Manual www.valuetronics.com...

  • Page 83: Using Averaging And Comparison Displays

    In this example, enter 64 with the numeric keypad. Press 6 4 ENTER in order. 4. Press the RUN/STOP key on the front panel to acquire waveform. 2-31 WCA230A & WCA280A Service Manual www.valuetronics.com...

  • Page 84: Figure 2-23: Comparing A New Waveform With An Averaged Waveform

    Average count Trace 1 Type Selects the type of processing for the selected trace. Figure 2-23: Comparing a new waveform with an averaged waveform 5. Press the Reset Average side key to restart averaging. 2-32 WCA230A & WCA280A Service Manual www.valuetronics.com...

  • Page 85: Figure 2-24: Comparison Display With Averaged Waveform

    Trace 1 (Yellow): currently acquired waveform. Trace 2 (Green): averaged waveform. Figure 2-24: Comparison display with averaged waveform 7. Press the Trace 2 Type... side key again and select Off to remove Trace 2. 2-33 WCA230A & WCA280A Service Manual www.valuetronics.com...

  • Page 86: Displaying A Spectrogram

    3. If no waveform is displayed, press the RUN/STOP key to acquire data. The spectrum and spectrogram are displayed concurrently (see Figure 2–25). Spectrum Spectrogram Figure 2-25: Concurrent display of spectrum and spectrogram 2-34 WCA230A & WCA280A Service Manual www.valuetronics.com...

  • Page 87: Figure 2-26: Tall Display Of Spectrum And Spectrogram

    VIEW: DEFINE key Modifies display format. b. Press the View Orientation side key to select Tall. Figure 2-26: Tall display of spectrum and spectrogram c. Press the View Orientation side key to select Wide. 2-35 WCA230A & WCA280A Service Manual www.valuetronics.com...

  • Page 88: Figure 2-27: Spectrogram View

    Amplitude is represented in color. Default scale is from Red (0dBm) to Blue (-100dBm). Frequency Figure 2-27: Spectrogram view c. Press the Show Views side key again to return to Multi. 2-36 WCA230A & WCA280A Service Manual www.valuetronics.com...

  • Page 89: Spectrum Analysis

    Measuring Channel Power 1. Press the MEASURE key on the front panel. MEASURE key Selects a measurement item Measurement items are displayed in the menu on the right side of the screen. 2-37 WCA230A & WCA280A Service Manual www.valuetronics.com...
  • Page 90 A band power marker, indicating measurement range, is displayed on the spectrum waveform. The measurement result is displayed below the waveform (see Figure 2–28). Select Channel Power here Band power marker Measurement results Figure 2-28: Channel power measurement 2-38 WCA230A & WCA280A Service Manual www.valuetronics.com...
  • Page 91 40 kHz for example. See the display in Figure 2–29. Channel Bandwidth Sets the measurement bandwidth. Channel Bandwidth = 40 kHz Figure 2-29: Channel power measurement (Channel Bandwidth = 40 kHz) 2-39 WCA230A & WCA280A Service Manual www.valuetronics.com...
  • Page 92 2. Press the Carrier Frequency side key. The measurement result is displayed at the bottom of the screen (see Figure 2–30). Carrier frequency measurement result: measured accurately with counter function. Figure 2-30: Carrier frequency measurement 2-40 WCA230A & WCA280A Service Manual www.valuetronics.com...

  • Page 93: Modulation Analysis

    The measurement procedures for modulation analysis and the time analysis are similar. Select the digital modulation analysis: 1. Press the DEMOD key on the front panel. 2. Press the Measurement Set side key to select Digital. 2-41 WCA230A & WCA280A Service Manual www.valuetronics.com...
  • Page 94 FFT processed and displayed in the subview. The data in the range indicated by the green underline is analyzed and displayed in the main view. Main view Figure 2-32: IQ level measurement 2-42 WCA230A & WCA280A Service Manual www.valuetronics.com...
  • Page 95 For example, enter 8 ms using the numeric keypad. 4. Press the Analysis Offset side key and specify the starting point of the range. For example, enter 3 ms using the numeric keypad. 2-43 WCA230A & WCA280A Service Manual www.valuetronics.com...

  • Page 96: Setting The Acquisition

    Frame and block size are shown in Figure 2–34. 1024 data points Frame 0 Frame 1 Frame 2 Frame 3 1 block (=N frames) Frame N-1 Figure 2-34: Frame and block 2-44 WCA230A & WCA280A Service Manual www.valuetronics.com...
  • Page 97 In this case, Acquisition Length is 64 ms and Spectrum Length 6.4 ms, so the data is displayed in the overview for 64B6.4=10 frames (10240 points). The green underline indicating the analysis range gets narrower than the previous setting: one block = 2 frames. 2-45 WCA230A & WCA280A Service Manual www.valuetronics.com...
  • Page 98 Figure 2–36, to select Single. Only the main view is displayed, with the size enlarged on the screen. Show Views Select Single to show only the selected view with the size enlarged. Figure 2-36: Single view display 2-46 WCA230A & WCA280A Service Manual www.valuetronics.com...
  • Page 99 1. Press the MEASURE key on the front panel. 2. Press the Measurement Off side key. The display returns to the spectrum view. However, the analysis mode is still in the Demod mode. 2-47 WCA230A & WCA280A Service Manual www.valuetronics.com...

  • Page 100: Using Windows Xp

    Connect a USB mouse and a USB keyboard to the USB ports on the side panel. Keyboard You can connect them to either or both ports. You can also connect the mouse to the USB port on the keyboard. USB ports Front Figure 2-38: USB ports (side panel) 2-48 WCA230A & WCA280A Service Manual www.valuetronics.com...
  • Page 101 The task bar appears. 2. Place the pointer on the icon indicating the analyzer model name (WCA230A or WCA280A) located on the task bar, and click on it with the right button of the mouse. A menu opens. 3. Select Close from the menu.

  • Page 102: Turning Off The Power

    1. Press the ON/STANDBY switch at the lower left of the front panel. The shutdown process of Windows XP runs and the power source goes to standby state, with the orange LED on. 2. Turn off the signal generator. You have now completed the tutorial. 2-50 WCA230A & WCA280A Service Manual www.valuetronics.com...

  • Page 103: Theory Of Operation

    Theory of Operation www.valuetronics.com...
  • Page 104 www.valuetronics.com...

  • Page 105: Rf Input Circuit

    Theory of Operation This section describes the electrical operation of the WCA230A and WCA280A using the major circuit blocks or modules as shown in Figure 9–1. RF Input Circuit The RF input circuit block consists of a relay for signal switching (Input Relay), Step Attenuator 1 and 2, Programmable Band-pass Filter (WCA280A only), and a control circuit for these components.
  • Page 106 39 MHz. After selected with a band-switching relay located at the input section of the 3 Converter, the 2 IF signal directly sent from the 1 Converter in RF2/3 band mode is also frequency-converted into the 3 IF signal of 39 MHz. WCA230A & WCA280A Service Manual www.valuetronics.com...
  • Page 107 PLL circuitry of the 2 Local Oscillator, a circuit for generation of DDS signal to be used as the reference signal for the 3 Local Oscillator, and other components. WCA230A & WCA280A Service Manual www.valuetronics.com...
  • Page 108 When the Power Trigger function is activated, window function operation and FFT operation mentioned above are bypassed. The data of the time domain are converted into the power domain and sent to Trigger Comparator. WCA230A & WCA280A Service Manual www.valuetronics.com...

  • Page 109: Power Supply Circuit

    On the A70 DC Power board, LED indicators and test points are provided to facilitate checking that all the power supply voltages are output normally. WCA230A & WCA280A Service Manual www.valuetronics.com...
  • Page 110 The GPIB controller is also installed on the Front Connection board, and its output bus is connected to the GPIB connector located on the real panel via the A50 Mother board and the A70 DC Power board. WCA230A & WCA280A Service Manual www.valuetronics.com...

  • Page 111: Performance Verification

    Performance Verification www.valuetronics.com...
  • Page 112 www.valuetronics.com...
  • Page 113 Tests, beginning on page 4–9, after doing the Functional Tests and Diagnostics just referenced. Advantages: These procedures add direct checking of warranted specifica- tions. They require more time to perform and suitable test equipment is required. (Refer to Equipment Required on page 4–10.) WCA230A & WCA280A Service Manual www.valuetronics.com...
  • Page 114 “Press MODE: DEMOD Õ Digital Demod Õ Constellation”. Set the WCA280A analyzer controls: Press MODE: DEMOD Õ Digital Demod Õ Constellation. STOP. The symbol at the left is accompanied by information you must read to do the procedure properly. WCA230A & WCA280A Service Manual www.valuetronics.com...

  • Page 115: Brief Procedures

    The Functional Tests utilize the internal calibration signal as a test-signal source for further verifying that the analyzer functions properly. The Diagnostics uses internal routines to verify that the instrument functions properly and passes the internal circuit tests. The following section provides the details. WCA230A & WCA280A Service Manual www.valuetronics.com...

  • Page 116: Functional Check

    Press the Signal Input Port... side key to select Cal. The spectrum of the calibration signal appears. e. Check that “INPUT: CAL” and “FREE RUN” are displayed in the status indicator at the upper right of the screen (see Figure 4–1). WCA230A & WCA280A Service Manual www.valuetronics.com...
  • Page 117 Press the SPAN key on the front panel. b. Confirm that the span is 15 MHz and the RBW is 80 kHz in the setup display on the upper part of the screen (see Figure 4–2). WCA230A & WCA280A Service Manual www.valuetronics.com...

  • Page 118: Table 4-1: Span And Rbw

    Figure 4–3. e. Using the numeric keypad, set the reference level back to 0 dBm. (Press 0 Õ ENTER, in that order, on the keypad.) WCA230A & WCA280A Service Manual www.valuetronics.com...
  • Page 119 Press the RUN/STOP key on the front panel to stop data acquisition. Confirm that the trace display freezes and PAUSE is displayed in the status indicator at the top right of the screen. WCA230A & WCA280A Service Manual www.valuetronics.com...

  • Page 120: Table 4-2: Internal Diagnostic Program

    You may press the All side key to run all the tests. 5. Check the result shown in the lower left view with “Pass” or “Fail”. The process is graphically displayed on the upper views. Figure 4-5: Diagnostic screen WCA230A & WCA280A Service Manual www.valuetronics.com...

  • Page 121: Performance Tests

    Performance Tests This section contains a collection of procedures for checking that the WCA230A and WCA280A Portable Wireless Communication Analyzers perform as warranted. STOP. These procedures extend the confidence level provided by the basic procedures described on page 4–3. Perform the basic procedures first and then perform the following procedures if desired.

  • Page 122: Equipment Required

    Output level: -30 dBm to +10 dBm; Agilent 83712B WCA280A only Accuracy: <±1 dB For WCA230A, you can use the signal generator with the frequency range of 10 kHz to 3 GHz, for example Agilent 8648C. 4-10 WCA230A & WCA280A Service Manual www.valuetronics.com...
  • Page 123 Created or updated with the proce 3.5 inch, 720 K or 1.44 MB, Storing flatness correction (Two required for dures described on page 5-6 DOS compatible floppy disk data for the signal generators WCA280A) (Item 1 and 2) 4-11 WCA230A & WCA280A Service Manual www.valuetronics.com...

  • Page 124: Auto Tests

    Refer to page 4-10 WCA230A/WCA280A Signal generator (Item 1) Signal generator (Item 2) GPIB cable GPIB cable Output 10 dB attenuator 50 W N N coaxial cable For WCA280A only Figure 4-6: Initial test hookup 4-12 WCA230A & WCA280A Service Manual www.valuetronics.com...
  • Page 125 Performance Tests 1. Prepare for the test: a. Power off the WCA230A/WCA280A analyzer and the signal generators. b. Connect the analyzer and the generator(s) with GPIB cable(s). See Figure 4–6. c. Connect the analyzer INPUT through a 10 dB attenuator followed by a 50 W N-N coaxial cable to the generator (Item 1) output.
  • Page 126 H Check that the maximum and the minimum values are within "0.5 dB. 4. Check the IF flatness in the RF (WCA230A) / RF1 (WCA280A) band: a. Press the side key Cancel-Back (twice) Õ IF Flatness PV. b. Set the GPIB address of the generator: H Press the SG side key to select the manufacturer of the generator: HP or Anritsu.
  • Page 127 H Check that the maximum and the minimum values are within "0.5 dB. 5. Check the RF flatness in the RF (WCA230A) / RF1 (WCA280A) band: a. Press the side key Cancel-Back Õ RF Flatness PV. b. Set the GPIB address of the generator: H Press the SG side key to select the manufacturer of the generator: HP or Anritsu.
  • Page 128 "1.2 dB. STOP. Steps 6 through 9b are the tests in the RF2 and RF3 bands for WCA280A only. For WCA230A, skip to step 9c. 6. Change the signal generator: a. Disconnect the N–N cable from the signal generator (Item 1) output.
  • Page 129 Enter a file name, for example RF2Flatness.pv, using the keyboard. (If necessary, change the directory.) Click the Open button with the mouse. The test starts. The result is written in text format to the specified file. 4-17 WCA230A & WCA280A Service Manual www.valuetronics.com...
  • Page 130 See Figure 4–6 on page 4–12 again. c. Remove the floppy disk from the analyzer. 10. Check spurious response in the RF (WCA230A) / RF1 (WCA280A) band: a. Press the side key Cancel-Back (twice) Õ Spurious PV. b. Modify the analyzer settings: H Press the SG side key to select the manufacturer of the generator: HP or Anritsu.
  • Page 131 Performance Tests STOP. Step 11 and 12 are the tests in the RF2 and RF3 bands for WCA280A only. For WCA230A, skip to step 13. 11. Change the signal generator: a. Disconnect the N–N cable from the signal generator (Item 1) output.

  • Page 132: Manual Tests

    H 10 MHz reference output H Absolute amplitude accuracy H Input attenuator setting uncertainty H Spectrum purity H 3rd order intermodulation distortion H Frequency readout accuracy H Spurious response H Displayed average noise level H Residual response 4-20 WCA230A & WCA280A Service Manual www.valuetronics.com...
  • Page 133 ....2. Check the frequency: Check that the frequency counter reads 10 MHz "1.2 Hz. 3. Disconnect the hookup: Disconnect the cable at REF OUT. 4-21 WCA230A & WCA280A Service Manual www.valuetronics.com...
  • Page 134 See Figure 4–9 on page 4–23. e. Turn on POWER REF and execute the calibration. Disconnect the RF input of the power sensor from the reference output of the power meter. 4-22 WCA230A & WCA280A Service Manual www.valuetronics.com...
  • Page 135 ....10 MHz d. Adjust the output level of the signal generator so that the power meter reads –10 dBm "0.05 dBm. e. Disconnect the cable from the power sensor input. 4-23 WCA230A & WCA280A Service Manual www.valuetronics.com...
  • Page 136 Performance Tests 3. Prepare for the test: a. Hook up the instruments: Connect the signal generator output through a 50 W N-N coaxial cable to the WCA230A/WCA280A INPUT. See Figure 4–11. WCA230A/WCA280A Signal generator Output 50 W N N coaxial cable Figure 4-11: Hookup for checking the absolute amplitude accuracy b.
  • Page 137 7. Modify the test hookup and preset the instrument controls: a. Hook up the instruments: Connect the signal generator output through a 50 W N-N coaxial cable to the WCA230A/WCA280A INPUT. See Figure 4–11 on page 4–24. b. Calibrate the analyzer gain: Press CAL Õ Calibrate Gain.

  • Page 138: Input Attenuator Setting

    50 W N N coaxial cable Figure 4-12: Initial test hookup c. Initialize the analyzer: H Press the SYSTEM key on the front panel. H Press the Reset All to Factory Defaults side key. 4-26 WCA230A & WCA280A Service Manual www.valuetronics.com...
  • Page 139 Repeat substeps a through d for attenuation from 2 to 30 dB in 2 dB steps. 4. Modify the generator controls: Amplitude ....–5 dBm 4-27 WCA230A & WCA280A Service Manual www.valuetronics.com...
  • Page 140 ) is within "0.5 dB. e. Repeat substeps a through d for attenuation from 32 to 50 dB in 2 dB steps. 8. Disconnect the test equipment: Disconnect the cable at the analyzer input. 4-28 WCA230A & WCA280A Service Manual www.valuetronics.com...
  • Page 141 H Press the TRACE/AVG key. H Press the side key Trace 1 Type...Õ Average. H Press the Number Of Averages side key and set the value to 50 using the general purpose knob. 4-29 WCA230A & WCA280A Service Manual www.valuetronics.com...
  • Page 142 H Press the RBW/FFT key on the front panel. H Press the RBW/FFT side key to select Man. H With the RBW side key, set the RBW to 2 kHz. 4-30 WCA230A & WCA280A Service Manual www.valuetronics.com...
  • Page 143 Check against limits: Read the phase noise (C/No) at the bottom of the screen. Confirm the value is 125 dB/Hz or more. 5. Disconnect the test equipment: Disconnect the cable at the analyzer input. 4-31 WCA230A & WCA280A Service Manual www.valuetronics.com...
  • Page 144 ....0 dBm ALC BW ....100 Hz 4-32 WCA230A & WCA280A Service Manual www.valuetronics.com...
  • Page 145 –10 dBm. H Press MARKERS: A or " to place the marker on the signal of 2000.15 MHz. H Adjust the generator (Item 4) output level so that the signal level is –10 dBm. 4-33 WCA230A & WCA280A Service Manual www.valuetronics.com...
  • Page 146 Check against limits: Read the first and the second marker readouts. Confirm that the larger value meets the requirement of –74 dBc. 3. Disconnect the test equipment: Disconnect the cable at the analyzer input. 4-34 WCA230A & WCA280A Service Manual www.valuetronics.com...
  • Page 147 2. Check frequency accuracy in the baseband: a. Modify the analyzer default settings: H Press the FREQUENCY/CHANNEL key on the front panel. H With the Center Freq side key, set the frequency to 10 MHz using the numeric keypad. 4-35 WCA230A & WCA280A Service Manual www.valuetronics.com...
  • Page 148 H Press MEASURE Õ Carrier Frequency. H Read the measurement result at the bottom of the screen. Confirm that the value is 10 MHz "1.2 Hz. 3. Check frequency accuracy in the RF (WCA230A) /RF1 (WCA280A) band: a. Modify the generator control: Frequency .
  • Page 149 H Press MEASURE Õ Carrier Frequency. H Read the measurement result at the bottom of the screen. Confirm that the value is 7 GHz "710 Hz. 6. Disconnect the test equipment: Disconnect the cable at the analyzer input. 4-37 WCA230A & WCA280A Service Manual www.valuetronics.com...
  • Page 150 H Press the RBW/FFT key on the front panel. H Press the RBW/FFT side key to select Man. H With the RBW side key, set the value to 50 kHz using the general purpose knob. 4-38 WCA230A & WCA280A Service Manual www.valuetronics.com...
  • Page 151 H Press the PEAK key to place Marker 2 on the peak signal. H Read the delta marker readout (D1–2) on the screen. Check that the components other than the carrier meet the requirement as shown in Table 4–4 (initially –73 dBc). 4-39 WCA230A & WCA280A Service Manual www.valuetronics.com...

  • Page 152: Table 4-4: Spurious Measurement

    Table 4–4, are checked. Table 4-4: Spurious measurement Band Frequency Spurious response Baseband 10 MHz -73 dBc RF (WCA230A) / RF1 (WCA280A) 2 GHz -73 dBc RF2 (WCA280A only) 5 GHz -70 dBc RF3 (WCA280A only) 7 GHz -70 dBc 3.
  • Page 153 H Press the RBW/FFT key on the front panel. H Press the RBW/FFT side key to select Man. H With the RBW side key, set the value to 10 kHz using the general purpose knob. 4-41 WCA230A & WCA280A Service Manual www.valuetronics.com...
  • Page 154 2. Check noise in the baseband: Read the measurement result of Density at the bottom of the screen. Check that the value is –151 dBm/Hz or less. 3. Check noise at 2 GHz in the RF (WCA230A) / RF1 (WCA280A) band: a. Modify the analyzer control: H Press the FREQUENCY/CHANNEL key on the front panel.
  • Page 155 H With the Center Freq side key, set the frequency to 7 GHz using the general purpose knob. b. Check against limits: Read the measurement result of Density at the bottom of the screen. Check that the value is –142 dBm/Hz or less. 4-43 WCA230A & WCA280A Service Manual www.valuetronics.com...
  • Page 156 H With the Span side key, set the span to 20 MHz using the general purpose knob. H Press the AMPLITUDE key on the front panel. H With the Ref Level side key, set the level to –30 dBm using the general purpose knob. 4-44 WCA230A & WCA280A Service Manual www.valuetronics.com...
  • Page 157 H With the Center Freq side key, set the frequency to 1.5 GHz using the numeric keypad. H Press the SPAN key on the front panel. H With the Span side key, set the span to 3 GHz using the numeric keypad. 4-45 WCA230A & WCA280A Service Manual www.valuetronics.com...
  • Page 158 Measure residual response: Press the PEAK key to place the marker at the peak on the noise floor. c. Check against limits: Read the marker readout. Confirm that the residual signal level is –85 dBm or less within the whole bandwidth. 4-46 WCA230A & WCA280A Service Manual www.valuetronics.com...
  • Page 159 Measure residual response: Press the PEAK key to place the marker at the peak on the noise floor. c. Check against limits: Read the marker readout. Confirm that the residual signal level is –85 dBm or less within the whole bandwidth. 4-47 WCA230A & WCA280A Service Manual www.valuetronics.com...

  • Page 160: Test Record

    Performance Tests Test Record Photocopy the following test record pages and use them to record the perfor- mance test results for your analyzer. 4-48 WCA230A & WCA280A Service Manual www.valuetronics.com...
  • Page 161 -0.5 dB +0.5 dB 22 dB -0.5 dB +0.5 dB 24 dB -0.5 dB +0.5 dB 26 dB -0.5 dB +0.5 dB 28 dB -0.5 dB +0.5 dB 30 dB -0.5 dB +0.5 dB 4-49 WCA230A & WCA280A Service Manual www.valuetronics.com...
  • Page 162 100 kHz 105 dB/Hz 5 MHz 1 MHz 125 dB/Hz order intermodulation distortion test Low limit Test result High limit order intermodulation distortion -74 dBc +5 dBm reference level, 2 GHz center frequency 4-50 WCA230A & WCA280A Service Manual www.valuetronics.com...
  • Page 163 0.5 to 3 GHz -90 dBm RF1 (WCA280A only) 0.5 to 3.5 GHz -90 dBm RF2 (WCA280A only) 3.5 to 6.5 GHz -85 dBm RF3 (WCA280A only) 5 to 8 GHz -85 dBm 4-51 WCA230A & WCA280A Service Manual www.valuetronics.com...
  • Page 164 Performance Tests 4-52 WCA230A & WCA280A Service Manual www.valuetronics.com...

  • Page 165: Adjustment Procedures

    Adjustment Procedures www.valuetronics.com...
  • Page 166 www.valuetronics.com...

  • Page 167: Requirements For Performance

    Adjustment Procedures This section contains information needed to manually adjust the WCA230A and WCA280A Portable Wireless Communication Analyzers. The section is divided into three subsections: H General information about adjusting the analyzer H A list of equipment required to perform the adjustments...

  • Page 168: Table 5-1: Test Equipment

    Signal interconnection For WCA230A, you can use the signal generator with the frequency range of 10 kHz to 3 GHz, for example Agilent 8648C. Use this instrument only. The adjustment procedures specify that the analyzer controls this instrument over the GPIB.
  • Page 169 Do the following procedures before executing the auto calibration: H Store calibration factors in the power meter H Prepare the flatness correction file for the signal generators. H Option 03 only. Install the setup files on the AWG520 waveform generator. WCA230A & WCA280A Service Manual www.valuetronics.com...
  • Page 170 0.1e9=99.1 2e9=98.1 4e9=97.1 6e9=96.5 7e9=96.2 8e9=96.0 9e9=95.8 Save the file with the extension of .cal (for example, sensor2.cal). You can load the file to the power meter using a floppy disk or through network. WCA230A & WCA280A Service Manual www.valuetronics.com...
  • Page 171 Press MEASURE Õ SG Flatness. Press the Read Cal Factor side key. The file selection dialog box appears. g. Enter the file name and then press the Open button. The calibration factors are stored in the power meter. WCA230A & WCA280A Service Manual www.valuetronics.com...
  • Page 172 One floppy disk (Item 15) Prerequisites When using the power meter other than Agilent 437B, select HP437B for the GPIB command set. For selecting the programming language, refer to the operation manual of the instrument. WCA230A & WCA280A Service Manual www.valuetronics.com...
  • Page 173 ... . 1 to 30 except 13 g. Initialize the analyzer: H Press the SYSTEM key on the front panel. H Press the Reset All to Factory Defaults side key. WCA230A & WCA280A Service Manual www.valuetronics.com...
  • Page 174 Press the Band side key to select the measurement frequency band. H 230. Measures from 1 MHz to 3 GHz for WCA230A. H Low. Measures from 1 MHz to 3.5 GHz for WCA280A. H High. Measures from 3.5 GHz to 8 GHz for WCA280A.
  • Page 175 The auto calibration for the analyzer with Option 03 (IQ input) needs the Waveform Generator AWG520 waveform generator (Item 3). The waveform files must be installed from the AWG520 Setup Disk (floppy disk, Item 16, Tektronix part number (Option 03 Only) 063-3680-00) onto the AWG520 hard disk before executing the calibration.

  • Page 176: Self Calibration

    (see Figure 5–4). If this happens, run the gain calibration When UNCAL is displayed, run the gain calibration UNCAL FREE RUN Frequency Span Input Att Figure 5-4: UNCAL display To run the gain calibration, do the following: 5-10 WCA230A & WCA280A Service Manual www.valuetronics.com...
  • Page 177 CAL menu Calibrate all Gain calibration CAL key Center offset calibration DC offset calibration Auto Calibration (Select Yes or No) Figure 5-5: Calibration menu 5-11 WCA230A & WCA280A Service Manual www.valuetronics.com...
  • Page 178 When you want to perform the gain, center offset, and DC offset calibration together, press the Calibrate All side key. NOTE. Enabling Auto Calibration (see Figure 5–5) allows the analyzer to run the center offset calibration automatically as analyzer settings change. 5-12 WCA230A & WCA280A Service Manual www.valuetronics.com...
  • Page 179 2. Press the Calibrate DC Offset side key. The calibration runs. It takes several seconds to complete the process. When you want to perform the gain, center offset, and DC offset calibration together, press the Calibrate All side key. 5-13 WCA230A & WCA280A Service Manual www.valuetronics.com...

  • Page 180: Auto Calibration

    Á Á Á Á for Option 03 only GPIB cable CH1 to CH2 to 50 W teminators to 50 W BNC I+ INPUT Q+ INPUT I- and Q- INPUTs coaxial cables Figure 5-8: Initial test hookup 5-14 WCA230A & WCA280A Service Manual www.valuetronics.com...
  • Page 181 Adjustment Procedures 1. Prepare for the adjustment: a. Power off the WCA230A/WCA280A analyzer, the signal generator(s), and the waveform generator (Option 03 only). b. Connect the analyzer and the generator(s) with GPIB cables. See Figure 5–8. c. Connect the signal generator (Item 1) output through a 10 dB attenuator (Item 11) followed by a 50 W N-N coaxial cable to the analyzer INPUT.
  • Page 182 Press the BB side key to perform calibration. NOTE. Alternatively, you can select BB + RF1 to perform calibration in both the baseband and the RF (WCA230A) / RF1 (WCA280A) band. In this case, skip to step 5. b. Wait. It takes several minutes to complete the calibration.
  • Page 183 Wait. It takes several minutes to complete the calibration. 9. Disconnect the test equipment: a. Disconnect the cable from the analyzer input. b. Turn off the analyzer and generators. c. Disconnect the GPIB cables from all the ports. 5-17 WCA230A & WCA280A Service Manual www.valuetronics.com...

  • Page 184: Reference Oscillator Frequency Adjustment

    ....Frequency 1 Gate time ....5-18 WCA230A & WCA280A Service Manual www.valuetronics.com...
  • Page 185 3. Restore the analyzer to normal operation: a. Power off the analyzer. b. Refer to Removal and Installation Procedures in Section 6 to reinstall the cabinet and other modules removed in step 1. 5-19 WCA230A & WCA280A Service Manual www.valuetronics.com...

  • Page 186: Reconfiguration Of Rf Modules

    ....b. Hook up the signal generator: Connect the generator output through a 50 W N-N coaxial cable to the analyzer INPUT. See Figure 5–11. 5-20 WCA230A & WCA280A Service Manual www.valuetronics.com...
  • Page 187 H With the Span side key, set the span to 3 GHz using the numeric keypad. 3. Check the spectrum: Confirm that a spectrum displays at 1.5 GHz. 4. Disconnect the test equipment: Disconnect the cable at INPUT. 5-21 WCA230A & WCA280A Service Manual www.valuetronics.com...
  • Page 188 Hook up the signal generator: Connect the generator output through a 50 W N-N coaxial cable to the analyzer INPUT. See Figure 5–11. WCA280A Signal generator Output 50 W N N coaxial cable Figure 5-12: Test hookup 5-22 WCA230A & WCA280A Service Manual www.valuetronics.com...
  • Page 189 H With the Span side key, set the span to 3 GHz using the numeric keypad. 3. Check the spectrum: Confirm that a spectrum displays at 6.5 GHz. 4. Disconnect the test equipment: Disconnect the cable at INPUT. 5-23 WCA230A & WCA280A Service Manual www.valuetronics.com...
  • Page 190 Adjustment Procedures 5-24 WCA230A & WCA280A Service Manual www.valuetronics.com...

  • Page 191: Maintenance

    Maintenance www.valuetronics.com...
  • Page 192 www.valuetronics.com...

  • Page 193: Related Maintenance Procedures

    Maintenance This section contains the information needed to do periodic and corrective maintenance on the WCA230A and WCA280A Portable Wireless Communica- tion Analyzers. The following subsections are included: H Preparation — Introduction plus general information on preventing damage to internal modules when doing maintenance.
  • Page 194 5. Handle circuit boards by the edges when possible. 6. Do not slide the modules over any surface. 7. Avoid handling modules in areas that have a floor or work-surface covering capable of generating a static charge. WCA230A & WCA280A Service Manual www.valuetronics.com...

  • Page 195: Table 6-1: Relative Susceptibility To Static-Discharge Damage

    2 = 200 to 500 V 7 = 400 to 1000 V (est.) 3 = 250 V 8 = 900 V 4 = 500 V 9 = 1200 V 5 = 400 to 600 V WCA230A & WCA280A Service Manual www.valuetronics.com...

  • Page 196: Inspection And Cleaning

    Use only deionized water when cleaning the menu buttons or front-panel buttons. Use a 75% isopropyl alcohol solution as a cleaner and rinse with deionized water. Before using any other type of cleaner, consult your Tektronix Service Center or representative. WCA230A & WCA280A Service Manual www.valuetronics.com...

  • Page 197: Table 6-2: External Inspection Check List

    CAUTION. To prevent getting moisture inside the analyzer during external cleaning, use only enough liquid to dampen the cloth or applicator. WCA230A & WCA280A Service Manual www.valuetronics.com...
  • Page 198 (75% solution) and rinse with warm deionized water. (A cotton- tipped applicator is useful for cleaning in narrow spaces and on circuit boards.) STOP. For further cleaning, contact your local Tektronix service center. WCA230A & WCA280A Service Manual www.valuetronics.com...

  • Page 199: Removal And Installation Procedures

    (see Figure 6–4), Mother board and its daughter boards (see Figure 6–5), Bottom modules – Power supply (see Figure 6–6), Bottom modules – RF1 for WCA230A (see Figure 6–7), Bottom modules – RF1 for WCA280A (see Figure 6–8), Front panel modules (see Figure 6–9), and Chassis modules (see Figure 6–10) in this analyzer.

  • Page 200: General Instructions

    If you are removing a module for service, begin by doing the procedure Access Procedure (page 6–21). By following the instructions in that procedure, you remove the module to be serviced while removing the minimum number of additional modules. WCA230A & WCA280A Service Manual www.valuetronics.com...

  • Page 201: Summary Of Procedures

    H Front panel H RF input connector H Rotary encoder H Preamp power H LCD display connector Procedures for H Fan H Board guide bracket 6-61 chassis modules H Side panel assembly H Rear panel modules WCA230A & WCA280A Service Manual www.valuetronics.com...
  • Page 202 Standard tool Retaining ring pliers Standard tool; inch minimum throw Angle tip tweezers Standard tool Pliers Standard tool Soldering iron Standard tool Solder wick Standard tool Adhesive TRA CON: Tra Bond #BA 2114 6-10 WCA230A & WCA280A Service Manual www.valuetronics.com...

  • Page 203: Analyzer Orientation

    Removal and Installation Procedures Analyzer Orientation Figure 6–1 shows how the sides of the analyzer are referenced in this manual. DOWN Figure 6-1: Analyzer orientation 6-11 WCA230A & WCA280A Service Manual www.valuetronics.com...
  • Page 204 Removal and Installation Procedures Rear foot Cabinet Handle Foot Flip stand Line cord Front cushion Foot pad Figure 6-2: External modules 6-12 WCA230A & WCA280A Service Manual www.valuetronics.com...
  • Page 205 Removal and Installation Procedures RF5 module RF4 module RF3 module RF2 module Figure 6-3: RF modules 6-13 WCA230A & WCA280A Service Manual www.valuetronics.com...
  • Page 206 Removal and Installation Procedures Disk bracket Stopper bracket Hard disk drive Shield bracket Shield bracket Floppy disk drive Front connection board CPU board Figure 6-4: CPU board and disk modules 6-14 WCA230A & WCA280A Service Manual www.valuetronics.com...
  • Page 207 Removal and Installation Procedures A70 DC power board A40 Memory board A30 Trigger board (optional) A20 DDC board A10 A/D board A50 Mother board Figure 6-5: Mother board and its daughter boards 6-15 WCA230A & WCA280A Service Manual www.valuetronics.com...
  • Page 208 Removal and Installation Procedures Power supply 1 Power supply 2 Insulator Shield bracket A71 AC power board Line filter Principal power switch Power supply 3 Figure 6-6: Bottom modules - Power supply 6-16 WCA230A & WCA280A Service Manual www.valuetronics.com...
  • Page 209 Removal and Installation Procedures Step attenuator 2 A100 Interconnection board Input relay Bracket Step attenuator 1 Figure 6-7: Bottom modules - RF1 (WCA230A) 6-17 WCA230A & WCA280A Service Manual www.valuetronics.com...
  • Page 210 Programmable band pass filter (YTF) Bracket Step attenuator 1 A150 YTF interface board Input relay Bracket Band relay Base plate A100 Interconnection board Step attenuator 2 Figure 6-8: Bottom modules - RF1 (WCA280A) 6-18 WCA230A & WCA280A Service Manual www.valuetronics.com...
  • Page 211 Preamp power A60 Front key board connector Front panel keys Front bezel Rotary encoder Front panel Front bracket Power switch board LCD filter Low front panel General purpose knob Figure 6-9: Front panel modules 6-19 WCA230A & WCA280A Service Manual www.valuetronics.com...
  • Page 212 Board guide bracket Rear panel PC board guide Blank plate bracket SMB - BNC connector Board guide SMB cable GPIB connector Stopper bracket Main chassis Side panel Shield bracket Figure 6-10: Chassis modules 6-20 WCA230A & WCA280A Service Manual www.valuetronics.com...

  • Page 213: Access Procedure

    A20 DDC board p.6-38 in Figure A30 trigger board p.6-38 6-5? A40 Memory board p.6-38 A70 DC power board p.6-39 A50 Mother board p.6-41 Figure 6-11: Guide to removal procedures 6-21 WCA230A & WCA280A Service Manual www.valuetronics.com...

  • Page 214: Procedures For External Modules

    Remove the center two screws securing the cabinet to the rear panel. c. Slide the cabinet backward. As you remove the cabinet, take care not to bind or snag it on the analyzer’s internal cabling. 4. Reinstallation: Reverse step 3 to reinstall the cabinet. 6-22 WCA230A & WCA280A Service Manual www.valuetronics.com...

  • Page 215: Front Cushion

    Remove the two screws securing the front cushion to the side panel at each side. b. Lifting the front of the analyzer slightly, move the front cushion away. 4. Reinstallation: Reverse step 3 to reinstall the front cushion. 6-23 WCA230A & WCA280A Service Manual www.valuetronics.com...
  • Page 216 While holding the handle release, pull the handle out of the slot in the handle cap. Repeat the procedure to remove the handle from the other handle cap. c. Reverse the procedure to reinstall. 6-24 WCA230A & WCA280A Service Manual www.valuetronics.com...
  • Page 217 6c; then refer to the Cabinet procedure on page 6–22 to reinstall the cabinet. Reverse steps 3 and 5, reversing each step, to reinstall the flip stand, then the handle caps (if removed), then the handle. 6-25 WCA230A & WCA280A Service Manual www.valuetronics.com...
  • Page 218 Removal and Installation Procedures Push down to flex handle and flatten against cabinet; then pull it out. Handle Cap Removal Handle Removal Flip Stand Removal Foot Removal Figure 6-14: Cabinet modules removal 6-26 WCA230A & WCA280A Service Manual www.valuetronics.com...

  • Page 219: Procedures For Rf Modules

    Unplug the following SMB cables on the RF2 module: W208, W207, W307, W21, W22, and W23. c. Remove the two screws securing the module to the main chassis. Lift the module up. 4. Reinstallation: Reverse step 3 to reinstall the RF2 module. 6-27 WCA230A & WCA280A Service Manual www.valuetronics.com...
  • Page 220 Removal and Installation Procedures W208 W207 RF4 module RF5 module W105 W307 W106 W307 W207 W208 W201 W201 RF2 module RF3 module Figure 6-15: RF modules removal 6-28 WCA230A & WCA280A Service Manual www.valuetronics.com...
  • Page 221 Remove the two screws securing the module to the main chassis. Lift the module up. 4. Reinstallation: Reverse step 3 to reinstall the RF3 module. 6-29 WCA230A & WCA280A Service Manual www.valuetronics.com...
  • Page 222 W30, W29, W208, W32, W41, and W40. b. Remove the two screws securing the module to the main chassis. Lift the module up. 4. Reinstallation: Reverse step 3 to reinstall the RF5 module. 6-30 WCA230A & WCA280A Service Manual www.valuetronics.com...

  • Page 223: Procedures For Cpu Board And Disk Modules

    CPU board. c. Remove the two screw securing the board to the main chassis. Lift the board up away. 5. Reinstallation: Reverse step 3 and 4 to reinstall the CPU board. 6-31 WCA230A & WCA280A Service Manual www.valuetronics.com...
  • Page 224 Removal and Installation Procedures IDE2 FDD1 COM1 CPU board DIMM2 DIMM1 IDE1 COM2 J102 DVO converter Board stopper bracket Memory support bracket Figure 6-16: CPU board removal 6-32 WCA230A & WCA280A Service Manual www.valuetronics.com...
  • Page 225 Remove the four screws securing the hard disk drive to the disk bracket. b. Lift the hard disk drive up away. 6. Reinstallation: Reverse step 4 and 5 to reinstall the hard disk drive. 6-33 WCA230A & WCA280A Service Manual www.valuetronics.com...
  • Page 226 Removal and Installation Procedures J122 J120 J112 J114 J110 J106 (FDD) J100 J104 J102 (HDD) A62 Front connection board Figure 6-17: Disk module removal 6-34 WCA230A & WCA280A Service Manual www.valuetronics.com...
  • Page 227 Remove the two screws securing the A62 board to the disk bracket. Lift the board up away. 4. Reinstallation: Reverse steps 2 and 3 to reinstall the A62 board. 6-35 WCA230A & WCA280A Service Manual www.valuetronics.com...
  • Page 228 Remove the two screws securing the front shield bracket to the main chassis. d. Remove the two screws securing the back shield bracket to the main chassis. e. Lift up the the A10 board with the brackets. 6-36 WCA230A & WCA280A Service Manual www.valuetronics.com...
  • Page 229 Remove the eight screws securing the back shield bracket to the A10 board. Lift the back shield bracket away. 6. Reinstallation: Reverse steps 4 and 5 to reinstall the A10 board and interconnect cables. Option 03 only Figure 6-18: A10 A/D board removal 6-37 WCA230A & WCA280A Service Manual www.valuetronics.com...
  • Page 230 Do step 3 in the A10 A/D Board procedure on page 6–36 to remove the board support bracket. 2. Orient the analyzer: Set the analyzer so its bottom is down on the work surface and its front is facing you. 6-38 WCA230A & WCA280A Service Manual www.valuetronics.com...
  • Page 231 Unplug the fan power cable from J300 and J302. b. Unplug the cable W75 (GPIB) from J410. c. Lift up the A70 board. 5. Reinstallation: Reverse step 3 to reinstall the A70 board and interconnect cables. 6-39 WCA230A & WCA280A Service Manual www.valuetronics.com...
  • Page 232 Board support bracket Rear support bracket RF5 module A70 DC power board Fan power GPIB A40 Memory board A30 Trigger board (Option 02 only) J300 A20 DDC board J302 J410 Figure 6-19: Daughter boards removal 6-40 WCA230A & WCA280A Service Manual www.valuetronics.com...
  • Page 233 Unplug the cables at J902, J900, J901, J912, J910, J911, J100, and J920 on the bottom of the analyzer. See Figure 6–36 on page 6–76 (WCA230A) or Figure 6–37 on page 6–77 (WCA280A) for cable interconnection. c. Orient the analyzer: Set the analyzer so its bottom is down on the work surface and its rear is facing you.
  • Page 234 Removal and Installation Procedures Figure 6-20: Mother board removal 6-42 WCA230A & WCA280A Service Manual www.valuetronics.com...

  • Page 235: Procedures For Power Supply Modules On The Instrument Bottom

    3. Remove the power supply 1: See Figure 6–22. Also see Figure 6–36 (WCA230A) or 6–37 (WCA280A) for cable interconnection. a. Unplug the cables at J902, J900, and J901 on the A50 Mother board.

  • Page 236: Removal And Installation Procedures

    W94 to CN1 W81 to CN53 W85 to CN51 CN53 W93 to CN1 CN51 CN61 CN81 CN53 CN51 CN61 W84 to CN81 CN61 and CN81 Figure 6-21: Power supply 1 and 2 removal 6-44 WCA230A & WCA280A Service Manual www.valuetronics.com...
  • Page 237 3. Remove the A71 AC power board: See Figure 6–22. Also see Figure 6–36 (WCA230A) or 6–37 (WCA280A) for cable interconnection. a. Unplug the cables at J100, J110, J120, and J130 on the A71 board.
  • Page 238 Removal and Installation Procedures W93 to J110 W94 to J130 J100 To CN1 on the J110 power supply 3 To J120 on A71 J120 J130 To J100 on A71 Figure 6-22: Power supply modules removal 6-46 WCA230A & WCA280A Service Manual www.valuetronics.com...
  • Page 239 Unplug the cables from the principal power switch. b. Pressing the catches at the top and the bottom of the switch, pull the switch out. 4. Reinstallation: Reverse step 3 to reinstall the principal power switch. 6-47 WCA230A & WCA280A Service Manual www.valuetronics.com...

  • Page 240: Procedures For Rf1 Modules On The Instrument Bottom

    H A100 Interconnection board H Step attenuator 2 (for WCA280A) H Input relay and step attenuator 1 and 2 (for WCA230A) H Input relay, programmable band-pass filter (YTF), step attenuator 1, and band relay (for WCA280A) A100 Interconnection 1.
  • Page 241 Removal and Installation Procedures J100 J300 J302 J111 J230 J130 J280 J120 J110 A100 Interconnection board W122 W117 to J130 on A100 Step attenuator 2 W105 for WCA280A Figure 6-23: RF1 modules removal - 1 6-49 WCA230A & WCA280A Service Manual www.valuetronics.com...
  • Page 242 Unplug the cable W117 on the step attenuator 2. c. Remove the four screws securing the attenuator to the main chassis. d. Using a inch wrench, disconnect the SMA cable W109 on the attenuator. 6-50 WCA230A & WCA280A Service Manual www.valuetronics.com...
  • Page 243 Removal and Installation Procedures W108 From J120 on A100 W109 W101 From J302 on A100 W107 Figure 6-24: RF1 modules removal - 2 (WCA230A) 6-51 WCA230A & WCA280A Service Manual www.valuetronics.com...
  • Page 244 Using a inch wrench, disconnect the SMA cable W101 at the RF INPUT. b. Using a inch wrench, disconnect the SMA cable W106 at the 3 dB attenuator on the programmable band-pass filter. 6-52 WCA230A & WCA280A Service Manual www.valuetronics.com...
  • Page 245 When removing the A150 YTF interface board, unsolder it at four points. W123 W106 To J110 on A100 W114 W119 W120 W114A W121 W101 W122 W123 Figure 6-25: RF1 modules removal - 2 (WCA280A) 6-53 WCA230A & WCA280A Service Manual www.valuetronics.com...
  • Page 246 Lift up the band relay. d. Unsolder the A150 YTF interface board at four points to remove it from the band relay. 9. Reinstallation: Reverse steps 3 through 8 to reinstall the RF1 modules. 6-54 WCA230A & WCA280A Service Manual www.valuetronics.com...

  • Page 247: Procedures For Front Panel Modules

    Unplug the cable at J60 on the A50 Mother board. c. Remove the two screws securing the front-panel assembly to the main chassis at each side. Lift the front-panel assembly away. 4. Reinstallation: Reverse step 3 to reinstall the front-panel assembly. 6-55 WCA230A & WCA280A Service Manual www.valuetronics.com...

  • Page 248: Rotary Encoder

    Using the 12 mm nutdriver, remove the nut securing the rotary encoder to the front bezel. 5. Reinstallation: Reverse steps 3 and 4 to reinstall the rotary encoder and the general purpose knob. 6-56 WCA230A & WCA280A Service Manual www.valuetronics.com...
  • Page 249 4. Remove the front panel: Unstick the front panel from the front bezel to remove it. 5. Reinstallation: Reverse steps 3 and 4 to reinstall the front panel, menu buttons, and front bezel. 6-57 WCA230A & WCA280A Service Manual www.valuetronics.com...
  • Page 250 3. Remove the preamplifier power connector: See Figure 6–27. Using the 14 mm nutdriver, remove the nut securing the connector to the front bracket. 6-58 WCA230A & WCA280A Service Manual www.valuetronics.com...
  • Page 251 Using a inch wrench, disconnect the SMA cable W101 at RF INPUT. See Figure 6–36 (WCA230A, page 6–76) or Figure 6–37 (WCA280A, page 6–77) for cable interconnection. b. Using a #2 Phillips screwdriver, remove the three screws securing the connector plate to the front sub-panel.
  • Page 252 Lift up and remove the LCD display. 5. Reinstallation: Reverse steps 3 and 4 to reinstall the LCD display and interconnect cables. To J710 on the Mother board To J700 on the Mother board Figure 6-28: LCD display removal 6-60 WCA230A & WCA280A Service Manual www.valuetronics.com...

  • Page 253: Procedures For Chassis Modules

    2. Orient the analyzer: Set the analyzer so its bottom is down on the work surface and its left side is facing you. 3. Perform the CPU Board and Disk Modules procedure on page 6–31 to remove the CPU board and the disk bracket. 6-61 WCA230A & WCA280A Service Manual www.valuetronics.com...
  • Page 254 Pull out the stopper bracket to complete the removal. 5. Reinstallation: Reverse steps 3 and 4 to reinstall the side panel assembly. To J300 on A70 To J302 on A70 Figure 6-29: Fan and side panel removal 6-62 WCA230A & WCA280A Service Manual www.valuetronics.com...
  • Page 255 2. Orient the analyzer: Set the analyzer so its bottom is down on the work surface and its left side is facing you. When removing the board guide, press its catches at both sides before pulling it backward. Figure 6-30: Board guide bracket removal 6-63 WCA230A & WCA280A Service Manual www.valuetronics.com...
  • Page 256 6. Remove the rear panel: Remove the two screws securing the rear panel to the main chassis. Lift up the rear panel away. 7. Reinstallation: Reverse steps 3 through 6 to reinstall the rear panel modules. 6-64 WCA230A & WCA280A Service Manual www.valuetronics.com...
  • Page 257 Removal and Installation Procedures Figure 6-31: Rear panel modules 6-65 WCA230A & WCA280A Service Manual www.valuetronics.com...
  • Page 258 Removal and Installation Procedures 6-66 WCA230A & WCA280A Service Manual www.valuetronics.com...

  • Page 259: Troubleshooting Procedure

    If a fault is detected, first check that the power unit is operating properly according to “Troubleshooting Procedure 1 — Power supply modules”. Then, locate the faulty board according to the troubleshooting tree for each fault or the symptom/cause table. 6-67 WCA230A & WCA280A Service Manual www.valuetronics.com...

  • Page 260: Power Supply System

    Check the test point voltages on A70 (see Table 6-7 and Figure 6-38). the fan on Replace the fan. the CPU board the voltages working? The power supply is OK. Figure 6-32: Troubleshooting procedure 1 Power supply system 6-68 WCA230A & WCA280A Service Manual www.valuetronics.com...
  • Page 261 Amplitude: +16 dBm is pressed? ±3 dB Replace RF5 module. Replace Display and CPU system is OK. A40 Memory board or A50 Mother board Figure 6-33: Troubleshooting procedure 2 Display and CPU system 6-69 WCA230A & WCA280A Service Manual www.valuetronics.com...

  • Page 262: Signal Path

    Frequency: 10 MHz Input relay, or Amplitude: -20 dBm A100 Interconnection board. ±1 dB Replace RF5 module. Replace Step attenuator 2, Band relay, or A100 Interconnection board. Figure 6-34: Troubleshooting procedure 3 Signal path 6-70 WCA230A & WCA280A Service Manual www.valuetronics.com...
  • Page 263 -6 dBm, and measured as follows? Frequency: 10 MHz ±10 Hz -8 dBm? Amplitude: +5 dBm ±3 dB Replace the A/D board. Replace RF5 module. Figure 6-34: Troubleshooting procedure 3 Signal path (Cont.) 6-71 WCA230A & WCA280A Service Manual www.valuetronics.com...
  • Page 264 Reconfiguration of RF Modules on set correctly? page 5-20. Replace RF5 module. Replace Restart the analyzer. RF2 module or RF4 module. Figure 6-34: Troubleshooting procedure 3 Signal path (Cont.) 6-72 WCA230A & WCA280A Service Manual www.valuetronics.com...
  • Page 265 ±3 dB amplitude? side key? Replace RF4 module. Replace Replace A100 Interconnection board. Replace the step attenuator 1. Step attenuator 1 or A100 Interconnection board. Figure 6-34: Troubleshooting procedure 3 Signal path (Cont.) 6-73 WCA230A & WCA280A Service Manual www.valuetronics.com...
  • Page 266 Refer to Reconfiguration of set correctly? RF Modules on page 5-20. Replace Restart the analyzer. Programmable band pass filter or A100 Interconnection board. Figure 6-34: Troubleshooting procedure 3 Signal path (Cont.) 6-74 WCA230A & WCA280A Service Manual www.valuetronics.com...
  • Page 267 To step att. 2 W307 W105 To prog. BPF W106 W201 Front connection J700 J810 J710 LCD inverter Power switch J140 J120 J130 Front key J100 Preamplifier power Figure 6-35: Top view for cable interconnection 6-75 WCA230A & WCA280A Service Manual www.valuetronics.com...
  • Page 268 To RF3 W117 W119 J110 J230 J302 J300 J120 J130 J280 W107 W116 Step attenuator 1 Input W114 (A110) relay To RF4 W101 RF input Figure 6-36: Bottom view for cable interconnection (WCA230A) 6-76 WCA230A & WCA280A Service Manual www.valuetronics.com...
  • Page 269 J110 J230 J130 J280 W123 (YTF) To RF3 Step attenuator 2 Input W119 W114 W105 (A120) relay W101 To RF4 RF input Figure 6-37: Bottom view for cable interconnection (WCA280A) 6-77 WCA230A & WCA280A Service Manual www.valuetronics.com...
  • Page 270 +3.3 V +3.14 V +3.46 V +3.3 V +3.14 V +3.46 V Power supply 3 +5 V +4.75 V +5.25 V +5 V +4.75 V +5.25 V +15 V +14.25 V +15.75 V 6-78 WCA230A & WCA280A Service Manual www.valuetronics.com...
  • Page 271 +6.6 V +6.27 V +6.93 V TP212 +5 V +4.75 V +5.25 V TP218 -15 V -15.75 V -14.25 V TP200 +20 V +19 V +21 V TP206 +6.6 V +6.27 V +6.93 V 6-79 WCA230A & WCA280A Service Manual www.valuetronics.com...

  • Page 272: Symptoms And Faulty Modules

    A front panel key does not respond. A60 Front key board, CPU board, or Windows hangs up. The frequency trigger does not work. A30 trigger board (Optional) Baseband mode does not work. A10 A/D board 6-80 WCA230A & WCA280A Service Manual www.valuetronics.com...
  • Page 273 Symptom (other functions are assumed to be normal) Possible faulty module RF1 band does not work. RF2 or RF3 module RF2 or 3 band does not work. RF3 module, Programmable BPF, or A100 Interconnection board 6-81 WCA230A & WCA280A Service Manual www.valuetronics.com...

  • Page 274: Notes For Changing Modules Or Parts

    A100 Interconnection Board H You must calibrate RF gain for RF1 band. Hard Disk Drive H Full calibration is necessary because the cal factors are lost. H Attach a new Windows license label. 6-82 WCA230A & WCA280A Service Manual www.valuetronics.com...
  • Page 275 Options www.valuetronics.com...
  • Page 276 www.valuetronics.com...

  • Page 277: Options And Accessories

    Options and Accessories This chapter describes the various options as well as the standard and optional accessories that are available for the WCA230A and WCA280A Portable Wireless Communication Analyzers. Options The following options can be ordered for the analyzer: H Option 1A: External preamplifier (20 dB gain to 3 GHz)
  • Page 278 Option number North America 120 V Universal Euro 230 V United Kingdom 230 V Australia 240 V North America 240 V Switzerland 220 V Japan 100 V China 240 V No power cord supplied. WCA230A & WCA280A Service Manual www.valuetronics.com...

  • Page 279: Standard Accessories

    Option 26 1xEV DO analysis software user manual 071 1371 XX Option 27 3GPP Release 5 downlink analysis software user manual 071 1509 XX Option 28 TD SCDMA analysis software user manual 071 1663 XX WCA230A & WCA280A Service Manual www.valuetronics.com...

  • Page 280: Optional Accessories

    071 1254 XX Japanese language programmer manual 071 1256 XX Service manual 071 1257 XX Accessory bag 016 A330 00 Preamplifier (20 dB gain to 3 GHz) 650 A900 XX Rack mount kit (for field conversion) WCA230A & WCA280A Service Manual www.valuetronics.com...

  • Page 281: Electrical Parts List

    Electrical Parts List www.valuetronics.com...
  • Page 282 www.valuetronics.com...
  • Page 283 The modules that make up this instrument are often a combination of mechanical and electrical subparts. Therefore, all replaceable modules are listed in Sec- tion 10, Mechanical Parts List. Refer to that section for part numbers when using this manual. WCA230A & WCA280A Service Manual www.valuetronics.com...
  • Page 284 Electrical Parts List WCA230A & WCA280A Service Manual www.valuetronics.com...
  • Page 285 Diagrams www.valuetronics.com...
  • Page 286 www.valuetronics.com...
  • Page 287 Diagrams This section contains the following diagrams: H Block diagram: Shows the modules and functional blocks. H Interconnect diagrams: Show how the modules connect together. WCA230A & WCA280A Service Manual www.valuetronics.com...
  • Page 288 Diagrams WCA230A & WCA280A Service Manual www.valuetronics.com...
  • Page 289 PCI bus GPIB Front connection CPU board 8.4" LCD Principal power board Front panel key 256 MB memory AC power board switch board GPIB controller ON/STANDBY USB X2 switch 3.5" FDD Figure 9-1: Block diagram WCA230A & WCA280A Service Manual www.valuetronics.com...
  • Page 290 WCA230A & WCA280A Service Manual www.valuetronics.com...
  • Page 291 J122 AC power board filter switch J100 J102 J112 DC DC Voltage Rotary Floppy disk Power switch converter regulator drive encoder board Preamplifier Hard disk Fans power drive GPIB Figure 9-2: Interconnect diagram (WCA230A) WCA230A & WCA280A Service Manual www.valuetronics.com...
  • Page 292 WCA230A & WCA280A Service Manual www.valuetronics.com...
  • Page 293 J122 AC power board filter switch J100 J102 J112 DC DC Voltage Rotary Floppy disk Power switch converter regulator drive encoder board Preamplifier Hard disk Fans power drive GPIB Figure 9-3: Interconnect diagram (WCA280A) WCA230A & WCA280A Service Manual www.valuetronics.com...
  • Page 294 WCA230A & WCA280A Service Manual www.valuetronics.com...

  • Page 295: Mechanical Parts List

    Mechanical Parts List www.valuetronics.com...
  • Page 296 www.valuetronics.com...

  • Page 297: Replaceable Parts

    Replaceable Parts This section contains a list of the replaceable modules for the WCA230A and WCA280A Portable Wireless Communication Analyzers. Use this list to identify and order replacement parts. Parts Ordering Information Replacement parts are available through your local Tektronix field office or representative.
  • Page 298 670 7918 03 670 7918 XX When you order parts, Tektronix will provide you with the most current part for your product type, serial number, and modification (if applicable). At the time of your order, Tektronix will determine the part number revision level needed for your product, based on the information you provide.

  • Page 299: Using The Replaceable Parts List

    Items in this section are referenced by figure and index numbers to the exploded view illustrations that follow. Tektronix part number Use this part number when ordering replacement parts from Tektronix. 3 and 4 Serial number Column three indicates the serial number at which the part was first effective. Column four indicates the serial number at which the part was discontinued.

  • Page 300: Replaceable Parts List

    10-1 200-A524-XX COVER,FRONT:WCA230A/280A 348-A152-XX PAD,FOOT:GRAY,WCA230A/280A 211-A039-XX SCREW,MACHINE:M4X14MM L,PNH,STL,ZN PL,CROSS REC,W/FLAT&LOCK WASHER 348-A150-XX CUSHION,FRONT:GRAL,WCA230A/280A 384-A223-XX SHAFT,STAND:SST 437-A013-XX CABINET,ASSY:WCA230A/280A 437-0508-XX CABINET,ASSY:WCA230A/280A WITH HANDLE AND FOOT 211-A004-XX SCREW,MACHINE:M4X10MM 348-A151-XX FOOT,REAR:GRAY,WCA230A/280A 213-A249-XX SCREW,MACHINE:M4X20 L,PNH,STL,ZN-C,CROSS REC,W/FLAT(MIGAKI)& LOCK WASHER 367-0247-XX HANDLE,CARRYING:11.54L,PLASTIC 200-2191-XX CAP,RETAINER:PLASTIC 348-1110-XX FOOT,CABINET:FRONT 161-0230-XX...
  • Page 301 Replaceable Parts Figure 10-1: External modules 10-5 WCA230A & WCA280A Service Manual www.valuetronics.com...
  • Page 302 BEZEL,FRONT:WCA230A/280A 333-A464-XX PANEL,FRONT:KEYBOARD,WCA230A/280A 333-A466-XX PANEL,FRONT:LOW,WCA230A/280A 366-A057-XX SHELL,KNOB:SILVER GRAY,38MM OD X 11MM H,ABS/PC 366-A056-XX KNOB,ASSY:6MM ID X 38MM OD X 11MM H,SILVER GRAY, ABS 334-A621-XX MARKER,IDENT:MKD,WCA230A 334-A622-XX MARKER,IDENT:MKD,WCA280A 174-B982-XX CA ASSY,SP,ELEC:16,26AWG,15CM,RIBBON,W/HLDR 174-B981-XX CA ASSY,SP,ELEC:5,26AWG,27CM,RIBBON,W/HLDR 10-6 WCA230A & WCA280A Service Manual www.valuetronics.com...
  • Page 303 Replaceable Parts Included in #11 Figure 10-2: Front panel assembly - 1 10-7 WCA230A & WCA280A Service Manual www.valuetronics.com...
  • Page 304 SCREW,MACHINE:M3X6MM L,PNH,STL,ZN PL,CROSS REC,W/FLAT(7MM OD)& LOCK WASHER 131-6608-XX CONN,RF:N TO SMA,50OHM,PANEL MOUNT 211-1028-XX SCREW,MACHINE:M4X8MM L,PNH,STL,ZN-C PL,CROSS REC,W/FLAT&LOCK WASHER 386-A857-XX PLATE:N-CONNECTOR 348-A116-XX SHLD GSKT ELEC:CONDUCTIVE URETHANE FOAM,1MM X 3MM,W/ADHESIVE 211-0751-XX SCREW,MACHINE:M3X8MM L,PNH,STL,ZN-C,CROSS REC,W/FLAT&LOCK WASHERS 10-8 WCA230A & WCA280A Service Manual www.valuetronics.com...
  • Page 305 Replaceable Parts Figure 10-3: Front panel assembly - 2 10-9 WCA230A & WCA280A Service Manual www.valuetronics.com...
  • Page 306 Serial No. Serial No. index part number effective discont'd Name & description number 10-4 211-1028-XX SCREW,MACHINE:M4X8MM L,PNH,STL,ZN-C PL,CROSS REC,W/FLAT&LOCK WASHER 119-B173-XX MODULE,RF:DOWNCONVERTER,GAIN BLOCK,WCA230A&WCA280A,RF5 119-B172-XX MODULE,RF:DOWNCONVERTER,RF4,SYNTHESIZER,WCA280A&WCA230A 119-B170-XX MODULE,RF:DOWNCONVERTER,1ST,RSA280,RF3(WCA280A) 119-B171-XX MODULE,RF:DOWNCONVERTER,1ST,RSA230,RF3(WCA230A) 119-B164-XX MODULE,RF:DOWNCONVERTER,2ND&3RD,RF2(WCA280A) 119-B165-XX MODULE,RF:DOWNCONVERTER,2ND&3RD,RF2(WCA230A) 10-10 WCA230A & WCA280A Service Manual www.valuetronics.com...
  • Page 307 Replaceable Parts Figure 10-4: RF modules 10-11 WCA230A & WCA280A Service Manual www.valuetronics.com...
  • Page 308 SCREW,MACHINE:M3X6MM L,PNH,STL,MFZN-C,CROSS REC W/FLAT&LOCK WASHER 348-1767-XX GASKET,SHIELD:CONDUCTIVE FORM STRIP,3.3MM X 4.8MM,W/ADHESIVE TAPE, 320 MM L 174-B983-XX CA ASSY,SP,ELEC:30,30AWG,20CM,W/HLDR,W SHIELD, DF19-30S-1C CONN 671-B164-XX CIRCUIT BD ASSY:A50 MOTHER,389-B165-XX WIRED 211-0871-XX SCREW,MACHINE:M3X12MM L,PNH,STL,ZN-CM1, W/K-PLAIN&SPLIT WASHER 343-1644-XX CLAMP,CABLE:CLIP LOCKING WIRE,NYLON 10-12 WCA230A & WCA280A Service Manual www.valuetronics.com...
  • Page 309 Replaceable Parts Included in #3. Figure 10-5: Mother board and its daughter boards - 1 10-13 WCA230A & WCA280A Service Manual www.valuetronics.com...
  • Page 310 351-A165-XX GUIDE,CKT BD:NYLON 407-4987-XX BRACKET,SUPPORT:MEMORY 211-A171-XX SCREW,MACHINE:M3X12MM L,PNH,STL,ZN-CM1, W/K-PLAIN&SPLIT WASHER 211-0871-XX SCREW,MACHINE:M3X6MM L,PNH,STL,MFZN-C,CROSS REC W/FLAT&LOCK WASHER 407-A690-XX BRACKET:STOPPER,PC BOARD 119-6925-XX CKT BD ASSY:CPU BD ASSY1196924XX + MEMORY119B117XX + A63 BD(6715800XX) + MECHA PARTS 10-14 WCA230A & WCA280A Service Manual www.valuetronics.com...
  • Page 311 Replaceable Parts See Figure 10-7 for details. Figure 10-6: Mother board and its daughter boards - 2 10-15 WCA230A & WCA280A Service Manual www.valuetronics.com...
  • Page 312 Tektronix part Serial No. Serial No. index number effective discont'd Name & description number 10-7 119-6946-XX HDD UNIT:2.5",IDE I/F,O/S AND F/W INSTALLED(WCA230A) 119-6947-XX HDD UNIT:2.5",IDE I/F,O/S AND F/W INSTALLED(WCA280A) 348-A144-XX DUMPER:DUMPER 129-A593-XX SUPPORT:PS-308 210-A014-XX WASHER,PLAIN:#6,BRS NI PL 210-0949-XX WASHER,FLAT:0.141IDX0.5ODX0.062,BRS NP 211-A170-XX SCREW,MACHINE:M3X15MM L,PNH,STL,ZN-CM1,W/M-PLAIN&SPLIT WASHER...
  • Page 313 Replaceable Parts Figure 10-7: Disk modules 10-17 WCA230A & WCA280A Service Manual www.valuetronics.com...
  • Page 314 CA ASSY,SP,ELEC:2,18AWG,10CM L,W/FASTON BOTH ENDS,W/TUBE 174-C005-XX CA ASSY,SP,ELEC:2,18AWG,15CM L,W/HOLDER,HLDR 5P TO 3P 174-C004-XX CA ASSY,SP,ELEC:2,18AWG,13CM L,W/FASTON TO HLDR 3P,W/TUBE 174-C005-XX CA ASSY,SP,ELEC:2,18AWG,15CM L,W/HOLDER,HLDR 5P TO 3P 174-C006-XX CA ASSY,SP,ELEC:2,18AWG,9CM L,W/HOLDER,HLDR 5P TO 3P 10-18 WCA230A & WCA280A Service Manual www.valuetronics.com...
  • Page 315 Replaceable Parts Figure 10-8: Bottom modules - Power supply 10-19 WCA230A & WCA280A Service Manual www.valuetronics.com...
  • Page 316 RELAY,COAX:COIL 12V,DC-18GHZ(IL<0.5DB),VSWR 1.5,SMA CONN 407-A697-XX BRACKET:SW&YTF,A5052P 211-A152-XX SCREW,MACHINE:M2.5X8MM L,PNH,STL,NI PL,CROSS REC,W/KOGATA-PLAIN& SPLIT WSHR 174-B951-XX CA ASSY,RF:50OHM,SEMI-RIGID,W108,FINE ATT TO STEP ATT 119-B180-XX MODULE,RF:DOWN CONVERTER,STEP ATT,WCA230 348-0949-XX GROMMET,PLASTIC:NYLON,BLACK,RING,15MM ID 174-B952-XX CA ASSY,RF:50OHM,SEMI-RIGID,W109,STEP ATT TO A310 10-20 WCA230A & WCA280A Service Manual www.valuetronics.com...
  • Page 317 Replaceable Parts See Figure 10-11 for details. A120 A110 Figure 10-9: Bottom modules - RF1 (WCA230A) 10-21 WCA230A & WCA280A Service Manual www.valuetronics.com...
  • Page 318 119-B186-XX ATTENUATOR:MODULE,STEP ATT,0-70DB,10DB STEP,DC-8GHZ,50 OHM, COIL 24V 0.72A 211-A152-XX SCREW,MACHINE:M2.5X8MM L,PNH,STL,NI PL,CROSS REC,W/KOGATA-PLAIN& SPLIT WSHR 119-B175-XX MODULE,RF:DOWN CONVERTER,FINE ATT,WCA230A&WCA280A 348-0949-XX GROMMET,PLASTIC:NYLON,BLACK,RING,15MM ID 174-B949-XX CA ASSY,RF:50OHM,SEMI-RIGID,W106,FINE ATT TO SW 174-B948-XX CA ASSY,RF:50OHM,SEMI-RIGID,W105,YTF TO A310 10-22 WCA230A & WCA280A Service Manual www.valuetronics.com...
  • Page 319 Replaceable Parts A150 See Figure 10-11 for details. A120 Figure 10-10: Bottom modules - RF1 (WCA280A) 10-23 WCA230A & WCA280A Service Manual www.valuetronics.com...
  • Page 320 Name & description number 10-11 174-B978-XX CA ASSY,SP,ELEC:16,26AWG,7CM,RIBBON,W/HLDR 211-0871-XX SCREW,MACHINE:M3X6MM L,PNH,STL,MFZN-C,CROSS REC W/FLAT&LOCK WASHER 671-B254-XX CIRCUIT BD ASSY:A100 INTER CONNECTION,389-B189-XX WIRED(WCA230A) 671-B187-XX CIRCUIT BD ASSY:A100 INTER CONNECTION,389-B189-XX WIRED(WCA280A) 174-C009-XX CA ASSY,SP,ELEC:5,26AWG,35CM L,RIBBON,W/HLDR 174-C011-XX CA ASSY,SP,ELEC:4,26AWG,25CM L,RIBBON,W/HLDR 174-C010-XX CA ASSY,SP,ELEC:6,26AWG,25CM L,RIBBON,W/HLDR(WCA230A)
  • Page 321 Replaceable Parts A100 See Figure 10-10 for details. (WCA280A only) Figure 10-11: Bottom modules - Interconnection 10-25 WCA230A & WCA280A Service Manual www.valuetronics.com...
  • Page 322 GUIDE,CKT BD:NYLON BLACK,100MM L 407-A680-XX BRACKET:GUIDE,PC BOARD 351-A168-XX GUIDE,CKT BD:NYLON BLACK,100MM L 351-A169-XX GUIDE,CKT BD:NYLON BLACK,19MM L 211-1028-XX SCREW,MACHINE:M4X8MM L,PNH,STL,ZN-C PL,CROSS REC W/FLAT&LOCK WASHER 441-A293-XX CHASSIS,MAIN:WCA230A/280A 211-1028-XX SCREW,MACHINE:M4X8MM L,PNH,STL,ZN-C PL,CROSS REC W/FLAT&LOCK WASHER 10-26 WCA230A & WCA280A Service Manual www.valuetronics.com...
  • Page 323 Replaceable Parts W40, W41 W42, W43 W44, W45 Figure 10-12: Chassis modules - 1 10-27 WCA230A & WCA280A Service Manual www.valuetronics.com...
  • Page 324 SCREW,MACHINE:M4X35 L,PNH,STL,ZN-C,CROSS REC,W/FLAT(MIGAKI)& LOCK WASHER 119-B161-XX FAN,TUBEAXIAL:12VDC,2W,2000RPM,31DB,W/CONNECTOR 348-A158-XX 10.5 SHLD GSKT ELEC:CONDUCTIVE URETHANE FOAM,1X4 W/ADHESIVE 348-A158-XX SHLD GSKT ELEC:CONDUCTIVE URETHANE FOAM,1X4 W/ADHESIVE 348-A143-XX 5 CM GASKET,SHIELD:FINGER TYPE,15.2MM W X 5.6MM H X 7.2MM L 10-28 WCA230A & WCA280A Service Manual www.valuetronics.com...
  • Page 325 Replaceable Parts Figure 10-13: Chassis modules - 2 10-29 WCA230A & WCA280A Service Manual www.valuetronics.com...
  • Page 326 LOCK WASHER 211-A039-XX SCREW,MACHINE:M4X14MM L,PNH,STL,ZN PL,CROSS REC,W/FLAT&LOCK WASHER 211-A004-XX SCREW,MACHINE:M4X10MM L,PNH,STL,ZN-C,CROSS REC,W/FLAT&LOCK WASHER 211-1028-XX SCREW,MACHINE:M4X8MM L,PNH,STL,ZN-C PL,CROSS REC,W/FLAT&LOCK WASHER 407-A699-XX BRACKET,SUPPORT:FRONT,LEFT 367-0492-XX HANDLE:BOW,60MM L,SST 211-A132-XX SCREW,MACHINE:M5X16MM L,PNH,STL ZN PL,CROSS REC,W/FLAT&LOCK WASHER 407-A700-XX BRACKET,SUPPORT:FRONT,RIGHT 10-30 WCA230A & WCA280A Service Manual www.valuetronics.com...
  • Page 327 Replaceable Parts Figure 10-14: Rackmount - 1 10-31 WCA230A & WCA280A Service Manual www.valuetronics.com...
  • Page 328 220-0193-XX NUT,PLAIN,HEX:M4X7MM HEX,STL,ZN-C 407-A708-XX BRACKET:SLIDE RAIL MT 407-A052-XX BRACKET:(5517) 351-A167-XX GUIDE,SLIDE:RACKMOUNT,L AND R,457.2MM SLIDE LENGTH 212-A012-XX SCREW,MACHINE:M4X8MM L,TRUSS HD,STL,NI PL,CROSS REC 333-A447-XX PANEL,FRONT:RACK MOUNT 211-A044-XX SCREW,MACHINE:M3X10MM L,FLH,STL,ZN PL,CROSS REC 211-1040-XX SCREW,MACHINE:M3X8MM L,FLH,STL,ZN-C,CROSS REC 10-32 WCA230A & WCA280A Service Manual www.valuetronics.com...
  • Page 329 Replaceable Parts Figure 10-15: Rackmount - 2 10-33 WCA230A & WCA280A Service Manual www.valuetronics.com...
  • Page 330 KEYBOARD:USB 103-0045-XX ADPTR,N,ELEC:FEMALE BNC TO MALE N 071-1253-XX MANUAL,TECH:USER,ENGLISH VERSION(WCA230A/WCA280A) 071-1255-XX MANUAL,TECH:PROGRAMMER,ENGLISH VERSION(WCA230A/WCA280A) OPTIONAL ACCESSORIES 071-1257-XX MANUAL,TECH:SERVICE,ENGLISH VERSION(WCA230A/WCA280A) 063-3680-XX SOFTWARE PKG:3.5FD,AWG520 SETUP DISK,FOR WCA200 SERVICE 020-2520-XX COMPONENT KIT:SERVICE MANUAL AND AWG520 SETUP DISK(063-3680-00) 10-34 WCA230A & WCA280A Service Manual www.valuetronics.com...
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