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Campbell ST-21 Information

Argos satellite transmitter
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Overview
Campbell Scientific's ST-21* is a Service Argos-certified Platform
Transmitter Terminal (PTT ) that transfers data from the datalog-
ger site to the Argos Data Collection and Location System via
NOAA polar orbiting satellites. This transmitter is well suited for
Benefits and Features
Well-suited for remote meteorological and environmental
data-collection applications, including mobile and high-
latitude installations
Compatible with Campbell Scientific's CR800, CR850, CR1000,
and CR3000 dataloggers
Provides uplink capability for up to eight unique ID codes,
frequencies, and repetition periods
Supports up to seven independent Argos data buffers that can
be populated in real-time
*While Campbell Scientific's ST-21 Argos PTT is based on Telonics' ST-21, they are not equivalent; our ST-21 includes a case, voltage regulator, and our
SDC communication interface.
remote meteorological and environmental data collection ap-
plications, including mobile and high-latitude installations. The
ST-21 is compatible with our newer dataloggers.
Transmits variable-length Argos messages with either 20- or
28-bit ID codes
Allows researchers to forgo a rigorous certification process
Includes an autorepeat feature that allows the ST-21 to repeat
data without host intervention
Provides a fail safe feature that alerts users upon communica-
tion link or host failure
Allows the ID and repetition rates to be set in real-time or by
Campbell Scientific
questions & quotes: 435.227.9000
www.campbellsci.com/st-21
COMPONENTS
ST-21
Argos Satellite Transmitter

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Summary of Contents for Campbell ST-21

  • Page 1 Allows the ID and repetition rates to be set in real-time or by be populated in real-time Campbell Scientific *While Campbell Scientific’s ST-21 Argos PTT is based on Telonics’ ST-21, they are not equivalent; our ST-21 includes a case, voltage regulator, and our SDC communication interface. questions & quotes: 435.227.9000...
  • Page 2 Message repeat intervals, Argos ID numbers, and duty cycles are when passing overhead. Pass duration is 10 minutes on average. changed at Campbell Scientific or by using the datalogger. Data The orbital period for each satellite is 1 hour, 42 minutes; passes must be decoded by the user, or by Service Argos.
  • Page 3 Platform Transmitting Terminal Subscribing to Argos (PTT) Equipment To use the Argos system, you must receive formal permission from Service Argos and pay a fee. The data must be used for envi- ST-21 Argos transmitter (includes an SC12 cable) ronmental purposes. Examples include meteorological/hydrolog- CR800, CR850, CR1000, or CR3000 datalogger ical stations, ship tracking, volcano monitoring, and seismic data.
  • Page 4: Ordering Information

    Ordering Information Argos Transmitter Antenna Cable/Bulkhead Installations When ordering the transmitter, the customer needs to provide Campbell 12022 ARGOS 0 dBd OMNI Marine 1/2 Wave Dipole Antenna Scientific with the number of buffers, repetition rate, decimal ID, Dex ID, 3659 1 in.