Campbell TX325 Product Manual
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Campbell TX325 Product Manual

Satellite transmitter for goes v2
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Revision: 10/2020
Copyright © 2019 – 2020
Campbell Scientific, Inc.

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  • Page 1 Revision: 10/2020 Copyright © 2019 – 2020 Campbell Scientific, Inc.

  • Page 2: Table Of Contents

    Table of contents 1. Introduction 2. Precautions 3. Initial inspection 4. QuickStart 4.1 Data collection platform (DCP) installation 5. Overview 5.1 GOES, NESDIS, and transmit windows 6. Specifications 7. Installation 7.1 Field site requirements 7.2 LED function 7.3 Ports and connectors 7.4 Transmission antenna 7.5 GPS antenna 7.6 Data logger programming...
  • Page 3 B.2.1 Campbell Scientific FP2 data B.2.2 Pseudobinary B.2.3 Additional pseudobinary representations B.3 Transmission durations Appendix C. Compliance documents and certificates Table of Contents - ii...

  • Page 4: Introduction

    The TX325 transmitter sends data via Geostationary Operational Environmental Satellites (GOES), and is the successor to the TX321. In the Western Hemisphere, the TX325 is compatible for use with NOAA GOES DCS with a coverage range including Canada, the United States of America, and Mexico—as well as most countries in Central America and many South American countries.

  • Page 5: Quickstart

    (DCP). This QuickStart is for the CR6 (≥OS 10), CR300-series (≥OS 10), CR1000X (≥OS 4), and GRANITE-series (≥OS1) data loggers. 1. Connect the data logger RS-232 to the TX325 RS-232 connector and connect the data logger to a power supply. Also ensure the TX325 has power.
  • Page 6 9. Select the Random Transmission Baud Rate as assigned by the GOES DCS Program. 10. Type the Random Transmission Channel as assigned by the GOES DCS Program. 11. Select the Self-Time Baud Rate as assigned by the GOES DCS Program. TX325 Satellite Transmitter for GOES V2...

  • Page 7: Data Collection Platform (Dcp) Installation

    GOES satellite network. 4.1 Data collection platform (DCP) installation 1. Yagi antenna installation procedure: a. Mount the Yagi antenna to a pole or mast by using the U-bolts included with the antenna mount. TX325 Satellite Transmitter for GOES V2...
  • Page 8 2. GPS antenna installation procedure: a. Connect the GPS cable to the GPS antenna. b. Route the cable through the 0.75-inch IPS threaded pipe and insert the pipe into the GPS antenna. TX325 Satellite Transmitter for GOES V2...
  • Page 9 Concrete might also be a problem. Heavy foliage, snow, and ice will attenuate the GPS signal. 3. Mount the TX325, the power supply, and the data logger to the backplate of an enclosure. 4. Mount the enclosure and solar panel to the pole or tripod.

  • Page 10: Overview

    The TX325 can transmit either self-timed or random GOES messages to the GOES West and GOES East satellites. In a typical configuration, the TX325 is connected to a data logger via an RS-232 serial connection. The data logger makes measurements, then formats those values to create a data packet, which is transferred to the transmitter at time of transmission.

  • Page 11: Goes, Nesdis, And Transmit Windows 8

    GPS receiver (±100 μs), and the internal clock is capable of maintaining accurate time for a minimum of six days without a GPS fix. If the TX325 finds itself without an accurate time, it suspends data transmissions until an accurate time is obtained. The GPS time is synched every 11 hours.
  • Page 12 The transmission is randomly repeated to ensure it is received. A combination of self-timed and random transmission can be executed by the TX325. Refer to Eligibility and getting onto the GOES system (p.

  • Page 13: Specifications

    41 dBm (300 bps), 47 dBm (1200 bps); based on a 11 dbm gain antenna with 1 dbm line loss Typical EIRP: 37 to 41 dBm (300 bps) , 43 to 47 dBm (1200 bps) Frequency range: 401.701 to 402.09925 MHz TX325 Satellite Transmitter for GOES V2...

  • Page 14: Installation

    The GPS antenna must have a clear view of most of the sky and the transmission antenna must have a clear view of the spacecraft. The TX325 must be installed in a well desiccated, TX325 Satellite Transmitter for GOES V2...

  • Page 15: Led Function

    The solar panel must have a clear view of the southern sky. Pay special attention to winter sun angles. 7.2 LED function A green Status LED and a red Failsafe LED indicate the state of the TX325 transmitter by using various blink patterns. Table 7-1 (p.

  • Page 16: Ports And Connectors

    300 bps transmission rates, the maximum transmit power is 31 dBm. At 1200 bps, the transmit power is 37 dBm. The GPS port on the TX325 is an SMA female connector for attaching an active 3.3 V GPS antenna. Operation without a GPS antenna connected will not cause damage, but the transmitter will not transmit without a valid GPS fix.

  • Page 17: Transmission Antenna

    For this power supply, the regulator connects to the TX325 power connector. 7.4 Transmission antenna The TX325 transmission antenna is a right-hand circular polarized Yagi with 11 dBi gain. A bracket is included with the antenna for mounting to a mast or pole. The antenna is directional and should be aimed at the spacecraft.
  • Page 18 For the Model, enter 3 to use the TX325. For the BufferControl, a value of 0 writes to the self-timed buffer and a value of 1 writes to the random buffer.

  • Page 19: Read And Write Settings

    Port used to communicate with the GOES transmitter. Controls whether the data loggers polls the GOESComPort to see if a TX325 radio is attached to it. With the default setting of 0 (not enabled), GOESEnabled the data logger ignores all other GOES settings. A value of 1 enables the setting.

  • Page 20: Read-Only Settings

    0, unless the transmission window is less than 60 seconds. Maximum offset is 23:59:59. A value 0 results in no offset. Number of times within the random transmit interval that the TX325 will GOESRepeatCount transmit the message data. Valid entries are 1 to 3.
  • Page 21 Voltage standing wave ratio (SWR) of the radio. GOESLastTxControlFlags Control flags used in the last transmission. Start time (UTC) of the last radio transmission. Value is a GOESLastTxStartTime string. GOESLastTxChannel Channel number used during the last radio transmission. TX325 Satellite Transmitter for GOES V2...

  • Page 22: Troubleshooting

    (p. 10)). Next, check the red Failsafe LED. If the LED is on continuously, the TX325 is in its fail safe mode, which is cleared by pressing the Reset button. The Reset button is located near the LEDs and is accessed through a hole in the side of the...

  • Page 23: Troubleshooting Over-Air Transmissions

    FIGURE 8-1. Reset button location The TX325 transmitter will go into the fail safe mode if one of two events occurs: 1. The transmitter RF output is turned on and left on for more than 110 seconds. 2. The transmitter is given a command to transmit less than 30 seconds after a transmission has taken place.
  • Page 24 The bottom table shows information that can help you determine the health of the DCP transmissions. This information includes signal quality (QUAL), transmission start time (CARRIER), and stop time(END). TX325 Satellite Transmitter for GOES V2...
  • Page 25 (p. 22)). This character is added to the number of bytes (shown as LEN) that were in the data transmission. Table 8-1: Characters indicating time sync Time synched since Character Data type last transmission Space ASCII Double quote (") ASCII Apostrophe (') Binary Lower case b Binary TX325 Satellite Transmitter for GOES V2...

  • Page 26: Appendix A. Eligibility And Getting Onto The Goes System

    2. Sign and submit the MOA. After the MOA is approved, NESDIS will issue a channel assignment and an ID address code. 3. IMPORTANT: Contact NESDIS to coordinate a start-up date. https://dcs2.noaa.gov for more information. TX325 Satellite Transmitter for GOES V2...

  • Page 27: Appendix B. Data Formats And Transmission Durations

    (Table B-1 (p. 25)). Number are rounded to selected precision during conversion. For example, +12.345, will be rounded to +12.35. Value is always 7 characters including a trailing comma. Value is always signed (+/-). TX325 Satellite Transmitter for GOES V2...
  • Page 28 Fields_Scan_Order = FALSE , Newest_First= FALSE , Format = 1 GoesField() Decimation = 1 <CR><LF>-7994.,-7994.,+8191.,-8191.,-8190.,+8191.,-8191.,- 8190.,+13.10,+27.32, GoesTable() Fields_Scan_Order = FALSE , Newest_First= FALSE , Format = 1 GoesField() Decimation = 4 <CR><LF>-7997.,-7997.,+8191.,-8191.,-8190.,+8191.,-8191.,- 8190.,+13.15,+26.08, <CR><LF>-7996.,-7996.,+8191.,-8191.,-8190.,+8191.,-8191.,- 8190.,+13.16,+26.04, <CR><LF>-7995.,-7995.,+8191.,-8191.,-8190.,+8191.,-8191.,- 8190.,+13.17,+26.03, <CR><LF>-7994.,-7994.,+8191.,-8191.,-8190.,+8191.,-8191.,- 8190.,+13.19,+26.18, TX325 Satellite Transmitter for GOES V2...

  • Page 29: Ascii Table Space (Goestable() Format Option 2)

    SHEF Codes can be added as headers or at the beginning of lines using option SHEF. Value has a fixed width (Table B-2 (p. 27)). Value has a fixed precision (Table B-2 (p. 27)). Value only has a leading sign when negative (–). TX325 Satellite Transmitter for GOES V2...
  • Page 30 <CR><LF>-9.78 -9.78 ///// ///// ///// ///// ///// ///// 13.14 26.08<CR><LF> GoesTable() Fields_Scan_Order = TRUE , Newest_First= FALSE , Format = 2 GoesField() Decimation = 1, Precision = 3, Width = 5 <CR><LF>-9.68 <CR><LF>-9.68 <CR><LF>///// <CR><LF>///// <CR><LF>///// <CR><LF>///// <CR><LF>///// <CR><LF>///// <CR><LF>13.12 <CR><LF>26.43<CR><LF> TX325 Satellite Transmitter for GOES V2...
  • Page 31 Decimation = 4, Precision = 3, Width = 5, SHEF set to HG, TA, VB NOTE: GoesField() To get a single battery voltage (or other additional data), set Decimation = 1 for just the battery_voltage (or other) value in the GOESTable(). TX325 Satellite Transmitter for GOES V2...

  • Page 32: Ascii Table Space, Comma Separated (Goestable() Format Option 3)

    Decimation = 1, Precision = 3, Width = 4 <CR><LF>-7.982,-7.982,////,////,////,////,////,////,13.1,25.8<CR><LF> GoesTable() Fields_Scan_Order = FALSE , Newest_First= FALSE , Format = 3 GoesField() Decimation = 4, Precision = 3, Width = 5 <CR><LF>-9.81,-9.81,/////,/////,/////,/////,/////,/////,13.15,26.08 <CR><LF>-9.80,-9.80,/////,/////,/////,/////,/////,/////,13.13,26.08 <CR><LF>-9.79,-9.79,/////,/////,/////,/////,/////,/////,13.14,26.08 <CR><LF>-9.78,-9.78,/////,/////,/////,/////,/////,/////,13.14,26.08<CR><LF> TX325 Satellite Transmitter for GOES V2...
  • Page 33 <CR><LF>-8.32,13.14,26.74 <CR><LF>-8.31,13.14,26.74 <CR><LF>-8.30,13.14,26.74 <CR><LF>-8.29,13.14,26.74<CR><LF> GoesTable() Fields_Scan_Order = TRUE , Newest_First= FALSE , Format = 3 GoesField() Decimation = 1, Precision = 3, Width = 5, SHEF set to HG, TA, VB <CR><LF>HG,-6.79 <CR><LF>TA,13.12 <CR><LF>VB,26.68<CR><LF> TX325 Satellite Transmitter for GOES V2...

  • Page 34: Line Shef (Standard Hydrological Exchange Format) (Goestable() Format Option 6)

    Value has a fixed precision (Table B-2 (p. 27)). Value only has a leading sign when negative (–). Data outside of operating range will be set to the minimum or maximum of the range. TX325 Satellite Transmitter for GOES V2...

  • Page 35: Pseudobinary Data Formats

    To encode a number, its binary form is broken into groups of 6 bits. Each group is placed into the lower 6 bits of a respective byte. The TX325 Satellite Transmitter for GOES V2...

  • Page 36: Campbell Scientific Fp2 Data

    +/– INF and NAN, most commonly used to indicate a computational or measurement error. Table B-5 (p. 34)) shows the numeric ranges and precision; Table B-6 (p. 34) describes the bits, Table B-7 (p. 34) provides bit usage in calculating a finished value. TX325 Satellite Transmitter for GOES V2...
  • Page 37 13 are the least significant four bits of the first byte, bits 12 through 7 are the least significant six bits of the second byte, and the last six bits are the least significant bits of the last byte. The following tables are examples of encoding values. TX325 Satellite Transmitter for GOES V2...
  • Page 38 Character 2 = S Character 3 = R Sign Exponent Mantissa Mantissa Mantissa Table B-11: Encoding of 123.4 Character 1 = B Character 2 = S Character 3 = R Sign Exponent Mantissa Mantissa Mantissa TX325 Satellite Transmitter for GOES V2...
  • Page 39 Character 2 = S Character 3 = R Sign Exponent Mantissa Mantissa Mantissa Table B-15: Encoding of -12.34 Character 1 = L Character 2 = S Character 3 = R Sign Exponent Mantissa Mantissa Mantissa TX325 Satellite Transmitter for GOES V2...
  • Page 40 Character 2 = ? Character 3 = ? Sign Exponent Mantissa Mantissa Mantissa Table B-19: Encoding of -INF Character 1 = I Character 2 = ? Character 3 = ? Sign Exponent Mantissa Mantissa Mantissa TX325 Satellite Transmitter for GOES V2...

  • Page 41: Pseudobinary

    B.3 Transmission durations Table B-22 (p. 39) provides the transmission durations, calculated from the number of bytes in a message. Table B-23 (p. 39) provides the maximum data bytes for an assigned time slot duration. TX325 Satellite Transmitter for GOES V2...
  • Page 42 GOES 1200 bps Assigned time-slot maximum data per message maximum data per message duration (seconds) (bytes) (bytes) 1444 2194 2944 3694 1090 4444 1278 5194 1465 5944 1653 6694 1840 7444 2028 8194 2215 8944 TX325 Satellite Transmitter for GOES V2...

  • Page 43: Appendix C. Compliance Documents And Certificates

    Compliance documents include the ISO certificate (FIGURE C-1 (p. 40)) and the GOES V2 certificate (FIGURE C-2 (p. 41)). The TX325 EU Declaration of Conformity is available at: www.campbellsci.com/tx325. Certificate of Registration This certifies that the Quality Management System of Signal Engineering, Inc.
  • Page 44 FIGURE C-2. GOES V2 certificate TX325 Satellite Transmitter for GOES V2...
  • Page 45 See Product Details on the Ordering Information pages at www.campbellsci.com. Other manufacturer's products, that are resold by Campbell Scientific, are warranted only to the limits extended by the original manufacturer.
  • Page 46 Campbell Scientific office serves your country. To obtain a Returned Materials Authorization or Repair Reference number, contact your CAMPBELL SCIENTIFIC regional office. Please write the issued number clearly on the outside of the shipping container and ship as directed.
  • Page 47 WHILE EVERY ATTEMPT IS MADE TO EMBODY THE HIGHEST DEGREE OF SAFETY IN ALL CAMPBELL SCIENTIFIC PRODUCTS, THE CUSTOMER ASSUMES ALL RISK FROM ANY INJURY RESULTING FROM IMPROPER INSTALLATION, USE, OR MAINTENANCE OF TRIPODS, TOWERS, OR...
  • Page 48 Campbell Scientific regional offices Australia France Thailand Location: Garbutt, QLD Australia Location: Vincennes, France Location: Bangkok, Thailand Phone: 61.7.4401.7700 Phone: 0033.0.1.56.45.15.20 Phone: 66.2.719.3399 Email: info@campbellsci.com.au Email: info@campbellsci.fr Email: info@campbellsci.asia Website: www.campbellsci.com.au Website: www.campbellsci.fr Website: www.campbellsci.asia Brazil Germany Location: São Paulo, SP Brazil...

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