Tait TB8100 User Manual
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Tait TB8100 User Manual

Calibration kit
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See also: Service Manual , User Manual
TB8100 base station
Calibration Kit
User's Manual
MBA-00011-07
Issue 7
April 2006

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Summary of Contents for Tait TB8100

  • Page 1 TB8100 base station Calibration Kit User’s Manual MBA-00011-07 Issue 7 April 2006...
  • Page 2 Directive requires that this product be disposed of Limited. separately from the general waste stream when its The word TAIT and the TAIT logo are trademarks of service life is over. Please be environmentally Tait Electronics Limited. responsible and dispose through the original supplier, All trade names referenced are the service mark, your local municipal waste “separate collection”...

  • Page 3: Table Of Contents

    Contents Preface ......................iii Typographical Conventions ..............iii Associated Documentation ...............iii Publication Record ................iii Basic Tasks ......................1 Using the TB8100 Calibration Kit ............1 About the Toolbar ................2 About the Status Bar ................2 Equipment Required ................3 Calibration Overview ................3 Field Calibration ................4 Service Center Calibration ..............4 Selecting the Communications Port ............5...
  • Page 4 Calibrating the Power Management Unit ............ 30 Calibrating the PMU Output Voltage ..........30 Index .................. 34 © Tait Electronics Limited April 2006 ii Contents...

  • Page 5: Preface

    Welcome to the TB8100 Calibration Kit User’s Manual. This manual provides you with information about the Tait TB8100 Calibration Kit in PDF format. You can view it online or print it if you want a paper copy. It describes how to use Version 03.00 of the Calibration Kit.

  • Page 6: Basic Tasks

    Tait TB8100 base stations (both receiver and transmitter), and to flatten the receiver response across that switching range. The TB8100 Calibration Kit is also used to calibrate the reciter, the PA, and the PMU after servicing.

  • Page 7: About The Toolbar

    Base Station > Calibrate, you can click the Calibrate icon on the toolbar. Connect Connects the TB8100 Calibration Kit to the base station and opens the communication channels. Switch Base Lets you select another base station to calibrate if there are multiple base stations Station in the rack (not currently supported).

  • Page 8: Equipment Required

    The following tables summarise, for each procedure, whether or not you need to remove the reciter from the subrack, and what equipment (in addition to a PC with the TB8100 Calibration Kit software) you will need. © Tait Electronics Limited April 2006...

  • Page 9: Field Calibration

    (only if using PA) Calibrating the RSSI Inside subrack RF signal source Calibrating the balanced lines Inside subrack CTU, AC millivoltmeter (perhaps with differential input) Calibrating the unbalanced lines Inside subrack CTU, AC millivoltmeter TB8100 Calibration Kit User’s Manual Calibration Overview 4...

  • Page 10: Selecting The Communications Port

    CTU. Equipment Calibration and test unit (CTU) An IBM compatible PC 10-30 V DC power supply 16-way cable RS-232 cable © Tait Electronics Limited April 2006 5 Selecting the Communications Port...
  • Page 11 PMU has a 12 V or 24 V auxiliary power output, you can use this as the power supply. A connector is supplied with the CTU. 3. Start the TB8100 Calibration Kit program, and check that the correct COM port is selected.

  • Page 12: Connecting To A Reciter Via The Control Panel

    If the base station is fitted with a TaitNet RS232 system Note: interface, the control panel serial port is disabled; connect to the serial port at the reciter rear instead. 2. Start the TB8100 Calibration Kit program, and check that the correct COM port is selected.

  • Page 13: Troubleshooting

    Software Version Help > About. Commands All the commands sent and received by TB8100 Calibration Kit are saved in a Record file called “CCTM.log”. The date, time, command number, and parameters are all stored in this file, which may be helpful when troubleshooting.

  • Page 14: Adjusting The Frequency Setup

    Adjusting the Receiver Lock Band The first step in preparing the TB8100 base station for operation is to adjust the receiver lock band (switching range). The lock band is the range of frequencies that the receiver is calibrated to operate on.

  • Page 15: Tuning A Uhf Receiver Front End

    Service Kit will be in error and RSSI gating levels will be incorrect. You should aim to achieve a response that looks something like this: Equipment Johanson tuning tool TB8100 Calibration Kit User’s Manual Tuning a UHF Receiver Front End 10...
  • Page 16 Note: more sensitive scale, so that you can see the graphical reading in more detail. Helical filters: Second set First set Use the tuning tools as follows. © Tait Electronics Limited April 2006 11 Tuning a UHF Receiver Front End...

  • Page 17: Tuning A Vhf Receiver Front End

    Otherwise the value reported by the Service Kit will be in error and RSSI gating levels will be incorrect. You should aim to achieve a response that looks something like this: Equipment Tuning tool TB8100 Calibration Kit User’s Manual Tuning a VHF Receiver Front End 12...
  • Page 18 6. Click Finish. An alert appears, asking that you calibrate the RSSI. The icon on the Frequency Setup tab indicates that this task is complete. 7. Re-calibrate the RSSI (see “Calibrating the RSSI” on page 19). © Tait Electronics Limited April 2006 13 Tuning a VHF Receiver Front End...

  • Page 19: Adjusting The Exciter Lock Band

    The bands turn green. Click Finish. Once you have finished adjusting the exciter lock band, the icon on the Frequency Setup tab indicates that this task is complete. TB8100 Calibration Kit User’s Manual Adjusting the Exciter Lock Band 14...

  • Page 20: Selecting The Exciter Sub-Band

    K band (850-869 MHz) and L1 band (852-854 MHz). L2 not used. Exciter VCO tuning hole for K band (762-776 MHz), L1 band (928-930 MHz), and L2 band (927-941 MHz) © Tait Electronics Limited April 2006 15 Selecting the Exciter Sub-band...

  • Page 21: Calibrating The Reciter

    RSSI. It is recommended that only accredited service centers Important: and Tait engineers perform these procedures. Calibrating the Exciter You will need to calibrate the exciter if you have made component-level repairs to it.
  • Page 22 K band (850-869 MHz) and L1 band (852-854 MHz). L2 not used. Exciter VCO tuning hole for K band (762-776 MHz), L1 band (928-930 MHz), and L2 band (927-941 MHz) © Tait Electronics Limited April 2006 17 Calibrating the Exciter...

  • Page 23: Calibrating The Vco

    9. Click Finish. (If you are using a PA, it will now stop transmitting.) When you have finished calibrating the VCO, the icon on the Reciter Calibration tab indicates that this task is complete. TB8100 Calibration Kit User’s Manual Calibrating the Exciter 18...

  • Page 24: Calibrating The Rssi

    This is to make sure the RSSI is correctly calibrated. Click Finish. When you have finished calibrating the RSSI, the icon on the Reciter Calibration tab indicates that this task is complete. © Tait Electronics Limited April 2006 19 Calibrating the RSSI...

  • Page 25: Audio Calibration

    Calibrating the balanced lines adjusts their gain, so that when you set line levels using the TB8100 Service Kit software, the actual line level correctly reflects the Service Kit settings. (Refer to the TB8100 Service Kit User’s Manual for further information.)

  • Page 26: Calibrating The Unbalanced Lines

    Calibrating the unbalanced lines adjusts their gain, so that when you set line levels using the TB8100 Service Kit software, the actual line level correctly reflects the Service Kit settings. (Refer to the TB8100 Service Kit User’s Manual for further information.)
  • Page 27 5. Connect the unbalanced output to the unbalanced input, and then click Finish. The unbalanced line input is now calibrated. When you have finished calibrating the unbalanced lines, the icon on the Reciter Calibration tab indicates that this task is complete. TB8100 Calibration Kit User’s Manual Audio Calibration 22...

  • Page 28: Carrier Frequency Offset Adjustment (Older Reciters)

    When you have finished, click Finish. (The setup now stops transmitting.) When you have finished, the icon on the Reciter Calibration tab indicates that this task is complete. © Tait Electronics Limited April 2006 23 Carrier Frequency Offset Adjustment (Older Reciters)

  • Page 29: Carrier Frequency Offset Adjustment (Newer Reciters)

    The Carrier Freq Offset Adjustment wizard provides assistance with this procedure. Tait recommends that the reciter TCXO is recalibrated after 3 months service and that annual checks are made thereafter in order to compensate for frequency drift. Recalibration ensures that the SDB (signal displacement bandwidth) is within 250 Hz.
  • Page 30 The following shows where the tuning control is located on B-band, C- band, and H-band reciters: The following shows where the tuning control is located on K-band and-L band reciters: © Tait Electronics Limited April 2006 25 Carrier Frequency Offset Adjustment (Newer Reciters)
  • Page 31 Important: Excessively tightening the screws can damage the thread of the aluminium heatsink. Tait recommends that you use a T10 torque driver set to 0.5 Newton meters (4.5 foot pounds). TB8100 Calibration Kit User’s Manual...

  • Page 32: Calibrating The Power Amplifier

    Perform the procedures in the above order. It is recommended that only accredited service centers Important: and Tait engineers perform these procedures. Calibrating the PA Bias The driver and final transistors of the power amplifier must be biased at a constant current.

  • Page 33: Calibrating The Pa Power

    Cables and connectors can easily cause a power loss of several Note: watts if either too long or poorly terminated. Always use the shortest possible leads (or connectors instead of leads) between the PA and power meter set-up. TB8100 Calibration Kit User’s Manual Calibrating the PA Power 28...

  • Page 34: Troubleshooting Tips

    VSWR > 1.3:1. If a calibration step cannot be stored, check that the load VSWR is <1.3:1. It is recommended that the load should have an input VSWR <1.2:1. © Tait Electronics Limited April 2006 29 Calibrating the PA Power...

  • Page 35: Calibrating The Power Management Unit

    4. Connect a digital multimeter to the PMU output and read the output voltage. 5. Enter the voltage into the PMU Voltage box and click Calibrate. 6. When the wizard indicates that the calibration completed successfully, click Finish. TB8100 Calibration Kit User’s Manual Calibrating the PMU Output Voltage 30...
  • Page 36 © Tait Electronics Limited April 2006 31 Calibrating the PMU Output Voltage...
  • Page 37 THE SOFTWARE OR FIRMWARE INCLUDING OPEN SOURCE of the Software or Firmware items prior-installed in the related COMPONENTS IS SUPPLIED BY TAIT AND ACCEPTED BY THE Tait product, included on CD or downloaded from the Tait “ ” LICENSEE AS IS WITHOUT WARRANTY OF ANY KIND EITHER website, (hereinafter referred to as “the Software or Firmware”)
  • Page 38 © Tait Electronics Limited April 2006 33 Tait General Software Licence Agreement...

  • Page 39: Index

    Set Exciter VCO Wizard Set Receiver VCO Wizard gate bias voltage Tune Receiver Front End Wizard Unbalanced Line Calibration Wizard VCO Band Tuning Wizard COM port hardware version control voltage entering coupler fwd voltage TB8100 Calibration Kit User’s Manual Index 34...
  • Page 40 Calibration Kit software tuning front end helical filters VSWR reciter calibrating connecting to connecting to in subrack wizards details see calibration wizards off-frequency © Tait Electronics Limited April 2006 35 Index...

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