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Phoenix Geophysics MTU-TXC User Manual

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PHOENIX GEOPHYSICS
MTU-TXC
Current Source
Controller
User Guide
Version 1 February 2004

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  • Page 1 PHOENIX GEOPHYSICS MTU-TXC Current Source Controller User Guide Version 1 February 2004...
  • Page 3 MTU-TXC Current Source Controller User GuideVersionj / F eb...
  • Page 4 Phoenix Geophysics Limited, 3781 Victoria Park Avenue, Unit 3, Toronto, ON Canada M1W 3K5, or mail@phoenix-geophysics.com. Information in this document is subject to change without notice. MTU-TXC and the Phoenix logo are trademarks of Phoenix Geophysics Limited. CompactFLash is a trademark of SanDisk Corporation.

  • Page 5: Table Of Contents

    Shutting down the MTU-TXC Grounding the MTU-TXC ..... . 14 ... . .25...

  • Page 7: Controlling A Current Source With The Mtu-Txc

    Chapter The MTU-TXC Current Source Controller output is adjustable for both frequency domain (FD) and time domain (TD) techniques. This chapter tells you how to: • make connections to the MTU-TXC and current sources, receivers, and a PC. • create, convert, and transfer schedule files.

  • Page 8: Introduction To The Mtu-Txc

    The MTU-TXC takes of the positive on time (or the negative on time in as input a schedule of frequencies in the time domain...
  • Page 9 (.fst) files. (The Generate Frequency Stepping Table utility program translates the .csv or .fst files into binary files before transfer to the MTU-TXC.) Table 1-1 on page 4 illustrates the waveform that will be generated for each Time and Frequency domain code setting in the schedule files.
  • Page 10 Chapter 1 Introduction to the MTU-TXC Table 1-1: Transmission Codes and Resulting Waveforms Ratio Duty Domain Waveform Code ON:OFF Cycle Time TD50 bipolar 1 : 1 : 1 : 1 Time 33.33% TD33 bipolar 1 : 2 :1 : 2...
  • Page 11 1 : 1 Frequency 10:8 55.55% bipolar Time TD50P unipolar positive 1 : 1 : 1 : 1 Time 33.33% TP33P unipolar positive 1 : 2 :1 : 2 = Aligned with 2000/01/01 00:00:00 UTC. Chapter 1 Introduction to the MTU-TXC...
  • Page 12 Chapter 1 Introduction to the MTU-TXC Table 1-1: Transmission Codes and Resulting Waveforms (continued) Ratio Duty Domain Waveform Code ON:OFF Cycle Time TD25P unipolar positive 1 : 3 : 1 : 3 Time TD50N unipolar negative 1 : 1 : 1 : 1 Time 33.33%...

  • Page 13: Pc Requirements

    The PC requires a properly configured ECP parallel port. The parallel port must be configured as an Extended The PC does not have to be connected to the MTU-TXC Capability Port (ECP). ECP provides a high-performance until you are ready to download or activate a schedule.
  • Page 14 Chapter 1 PC requirements To create an ECP parallel port: 1. Be prepared to issue the keyboard command that puts your PC into CMOS Setup during system startup (“cold boot”). This command varies from one manufacturer and model to another. Consult your PC documentation or the manufacturer’s Web site.
  • Page 15 parallel port to ECP. If there are options for a DMA hardware?” click “No, I want to select the hardware channel or Interrupt Request, accept the defaults. from a list.” 6. Save the new settings and exit CMOS Setup. 5. Choose Ports (COM & LPT) from the list and then click on (Standard port types) and ECP Printer Port.

  • Page 16: Troubleshooting Parallel Port Communications

    If you experience communication problems between three or four lines: two Input/Output Ranges, an the PC and the MTU-TXC, there may be a problem with Interrupt Request, and possibly a Direct Memory the parallel port configuration or operation. Try these...

  • Page 17: General Techniques

    General techniques This section explains how to connect the GPS antenna, the battery, and a PC to the MTU-TXC. Handling locking-ring connectors Fig. 1-2: GPS and Battery connectors. The PC and current source or receiver connections are...

  • Page 18: Connecting A Pc

    Chapter 1 General techniques Connecting a PC To remove a protective cap: • On the MTU-TXC, push on the cap and turn it A special cable is supplied to connect the PC parallel counterclockwise. port to the MTU-TXC. • On a cable end, hold the cap in one hand and with the other hand, push the locking ring toward the cap and turn the ring counterclockwise.

  • Page 19: Connecting The Gps Antenna

    To prevent damage to the PC because of accidental possible. If necessary, tape the antenna tripod to polarity reversal, start up the PC and the MTU-TXC another object (e.g., a stake, post, or larger tripod) independently and verify their proper operation before connecting the two together.

  • Page 20: Grounding The Mtu-Txc

    MTU-TXC canvas case. The antenna can receive satellite 3. Thread the twisted strands of the cable through the signals even if the MTU-TXC is wrapped in a protective hole in the shaft of the terminal, and wrap the free tarpauline. (Just make sure the top of the antenna end clockwise around the shaft.

  • Page 21: Connecting The Battery

    Connecting the battery that the connection is secure and of correct polarity. The MTU-TXC is powered by a 12V DC battery, which should be fully charged prior to use. (Follow the On batteries with spade terminals, attach the alligator instructions provided on the Battery Charging Quick clamps so that they grip the edges rather than the flat Reference Guide.)
  • Page 22 Fig. 1-6: Li-ion battery cable connections. 3. Fit the other end of the cable to the EXT BATT terminal on the MTU-TXC as described on page 11. Note The mini-jack plug on the battery cable should be Fig. 1-5: Li-ion battery LED Fuel Gauge.

  • Page 23: Connecting To A Current Source Or Receiver

    Refer to the User Guide for the current source or pattern of larger pins connects to the T-3 and the other receiver you are using for instructions on connecting an end connects to the MTU-TXC. external timing drive. (Typically, you need only connect the supplied cable to the...

  • Page 24: Understanding Led Indications

    The LED pattern is 1s on, 1s off, for each satellite acquired, for up to four satellites. The LED indicator between the terminals provides an indication of the MTU-TXC status. For most indications, the LED blinks in a specific pattern that 11 12 seconds repeats every 12s.

  • Page 25: Using Schedule Files

    All items on the line must be separated by a comma. This is most easily achieved in a spreadsheet program Schedule files must be saved in the MTU-TXC \DATA such as Excel, using the Save as CSV function. directory. You can create the tables in a text editor or...
  • Page 26 Chapter 1 Using schedule files want to transmit, and note the corresponding Code in the last column. 3. In the first cell of the spreadsheet, type the waveform Code (Fig. 1-14: on page 21). 4. Move to the next cell on the right and type the...
  • Page 27 However, you will have to rename such files to Fig. 1-14: Creating a schedule file in Excel. For current numerical names before the MTU-TXC can use them. sources other than the T-200, Column C should have values of zero.

  • Page 28: Converting The Schedule To Binary Format

    Converting the schedule to binary format The file you create in Excel or Notepad must be converted to binary format before the MTU-TXC can read it. The output of the Generate Frequency Stepping Table program is a binary format file with the same name as the the CSV file, but with the extension TFS.

  • Page 29: Transferring The Schedules To The Mtu-Txc

    5. Power up the MTU-TXC by pressing the POWER switch and releasing it. 6. Watch the LED on top of the MTU-TXC, and wait approximately 30s for GPS synchronization to begin, indicating that the unit has finished booting up. (See “Understanding LED indications” on page 18.)

  • Page 30: Activating A Schedule

    Activating a schedule The MTU File Utilities dialog box opens. To activate a schedule: 1. With the PC connected to the MTU-TXC, launch the Raw Parameter Table Interface (WpTab). 2. Scroll if necessary to locate the AUTO parameter, and select it.

  • Page 31: Saving Settings

    To avoid damage to the MTU-TXC, care must be taken to shut it down properly. Note If you turn on the MTU-TXC or change the active table just after the UTC-synchronized start-time of a low To shut down the MTU-TXC: frequency, there will be a noticeable delay before the next start-time, when transmission will begin.
  • Page 32 2. Watch the red LED indicator and wait approximately 20s until it goes out. It is now safe to remove the battery connection. Warning! Do not disconnect the battery from the MTU-TXC while it is powered on. Serious damage to the unit may result.

  • Page 33: Index

    Index connecting Numerics battery, 15 PC, 12 921.6 kHz signal, 2 global positioning system, see GPS connections order of, 15 antenna tripod, 14 creating a frequency schedule file, 19 antenna, connecting, 13 activating a schedule, 24 CSV files, 19 LED indications, 18 alligator clamps, battery, 15 automatic formatting, Excel, 20 Device Manager, Windows, 7...
  • Page 34 21 configuring, 7 transferring, 23 troubleshooting communications, 10 Setup.exe, 7 PC software, installing, 7 waveform shutting down the MTU-TXC, 25 PC, connecting, 12 bipolar, 4 signal, 921.6 kHz, 2 phase, 2 code, 20 significant digits in auto modes, 2...

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